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All Journal Jurnal Rekayasa Proses Reaktor International Journal of Renewable Energy Development Jurnal Presipitasi : Media Komunikasi dan Pengembangan Teknik Lingkungan Urania Jurnal Ilmiah Daur Bahan Bakar Nuklir Journal of Engineering and Technological Sciences JURNAL INTEGRASI PROSES Chemistry Indonesian Journal of Chemical Research Jurnal Rekayasa Proses Astonjadro Jurnal Teknik ASEAN Journal of Chemical Engineering Jurnal Teknologi Bahan dan Barang Teknik International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Rekayasa Proses Journal of Engineering and Technological Sciences Scientific Contributions Oil and Gas
Hary Devianto
Program Studi Teknik Kimia, Fakultas Teknologi Industri, Institut Teknologi Bandung
Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Social Sciences Other

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The Effect of Counter Electrode Preparation Methods Toward Dye Sensitized Solar Cell Performance Pramujo Widiatmoko; Hary Devianto; Isdiriayani Nurdin; Adriaan Adriaan; Henry Natanail Purwito
Jurnal Teknologi Bahan dan Barang Teknik Vol 8, No 1 (2018)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2731.098 KB) | DOI: 10.37209/jtbbt.v8i1.112

Abstract

Carbon-coated electrodes is superior substitution for platinum electrodes of Dye-Sensitized Solar Cells (DSSC). This paper describes effect of electrode coating methods as well as carbon types on the performance of DSSC. The electrodes were prepared using 3 methods, i.e. doctor blade, metering rod and bubble deposition. Commercial industrial-grade and medical-grade activated carbon were used in this research. The DSSC performance was measured from I-V curve and electrochemical impedance spectroscopy, meanwhile the morphology of coated carbon electrode was studied from Scanning Electron Microscope and Brunauer-Emmett-Teller analysis. It was found that efficiency of DSSC was higher when the counter electrodes were prepared using doctor blade and bubble deposition methods with medical-grade activated carbon. The highest achievement on light-to-electricity conversion was 3.76%.Elektroda bantu karbon merupakan alternatif pengganti elektroda platinum yang baik untuk aplikasi sel surya tersensitisasi pewarna (Dye-Sensitized Solar Cell, DSSC). Makalah ini menjelaskan pengaruh metode pelapisan elektroda bantu serta jenis karbon pada kinerja DSSC. Elektroda disiapkan menggunakan 3 metode yaitu bilah dokter, batang pengaduk dan pelapisan gelembung. Karbon aktif untuk industri dan medis digunakan dalam penelitian ini. Kinerja DSSC ditentukan berdasarkan data kurva I-V dan spektroskopi impedansi elektrokimia, sementara morfologi lapisan karbon pada elektroda dipelajari menggunakan Scanning Electron Microscope dan analisis Brunauer-Emmett-Teller. Efisiensi DSSC lebih tinggi diperoleh ketika elektroda bantu disiapkan menggunakan metode bilah dokter dan pelapisan gelembung dengan karbon aktif medis. Perolehan tertinggi efisiensi konversi cahaya ke listrik adalah 3,76%.
Pemanfaatan Sistem Hibrid Fotovoltaik – PLN pada Elektrolisis Kontinyu untuk Menghasilkan Hidrogen Pramujo Widiatmoko; Tatto Bustomi; Muhammad Mara Ikhsan; Rizky Eka Ahmad; Isdiriayani Nurdin; Hary Devianto
Jurnal Teknologi Bahan dan Barang Teknik Vol 10, No 2 (2020)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37209/jtbbt.v10i2.184

Abstract

Produksi hidrogen melalui elektrolisis menggunakan energi matahari sangat potensial di Indonesia, namun terkendala oleh ketidakstabilan penyinaran matahari. Penggunaan sumber listrik konvensional sebagai komplementer dapat mengatasi ketidakstabilan tersebut. Dalam penelitian ini, elektrolisis air dilakukan dalam sel dengan ruang ganda dengan elektrolit larutan KOH 3 M. Variasi dilakukan terhadap jenis dan bentuk elektroda serta laju alir elektrolit. Sumber energi listrik divariasikan dengan sumber listrik konvensional dari PLN, modul fotovoltaik, serta hibrid dari kedua sistem tersebut. Kinerja elektrolisis dianalisis dengan mengukur volum hidrogen yang terbentuk, rapat energi yang dibutuhkan, serta efisiensi arus listrik. Hasil penelitian menunjukkan penggunaan sistem hibrid dapat menstabilkan produksi hidrogen untuk elektrolisis pada tegangan 15 V selama 7 jam operasi. Dibandingkan dengan penggunaan listrik PLN sepenuhnya, sistem hibrid memberikan peluang penghematan energi hingga 81,64%.
Pengaruh Laju Alir Larutan Asam Sitrat terhadap Korosi Aluminium Isdiriayani Nurdin; Pramujo Widiatmoko; Hary Devianto; Ferdyan Ihza Akbar; Tiara Calista Shandy
Jurnal Teknologi Bahan dan Barang Teknik Vol 8, No 2 (2018)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (512.273 KB) | DOI: 10.37209/jtbbt.v8i2.119

Abstract

Corrosion behaviour of alumina in a citric acid solution has been investigated under a dinamic condition of fluid. The corrosion test was conducted using the Rotating Disk Electrode and potentiostat. The citric acid concentration were 2, 3.5 and 5% w/v. The corrosion rates were found to be severe, within the rate of 2.12 – 24.86 mm/year. The corrosion rate under the citric acid concentration of 5% was found lowest due to the formation of passive layer. The corrosion was of a one step irreversible reaction, and the corossion product of Al2O3 was unstable.Penelitian ini bertujuan untuk mengetahui perilaku korosi aluminium dalam larutan asam sitrat pada kondisi fluida dinamis. Pengujian laju korosi dilakukan dengan menggunakan Rotating Disk Electrode (RDE) dan potensiostat. Konsentrasi asam sitrat divariasikan 2%, 3,5% dan 5%–w/v pada rejim aliran transisi dan turbulen. Hasil penelitian menunjukkan laju korosi aluminium yang ganas, dalam rentang 2,12–24,86 mm/tahun. Konsentrasi asam sitrat 5%-w/v memberikan laju korosi aluminium yang lebih rendah akibat pembentukan lapisan pasif. Reaksi korosi yang terjadi bersifat irreversible satu tahap dengan produk korosi berupa Al2O3 yang tidak stabil.
Potency of Solar Hydrogen Generation System in Urban Area: Case Study of Bandung City Pramujo Widiatmoko; Hary Devianto; Isdiriayani Nurdin; Saumi Febrianti Khairunnisa; Muhammad Irfan Rafi
Jurnal Teknologi Bahan dan Barang Teknik Vol 6, No 2 (2016)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (722.181 KB) | DOI: 10.37209/jtbbt.v6i2.69

Abstract

Development of hydrogen production system is important in the future to support electric vehicles operation. This paper studies potency of rooftop PV-PEM electrolyser system connected to fuel station in urban area of Bandung City. Rooftop inclination and orientation of the PV influences the generated electricity by 0.8 – 4.2% compared with horizontal installed-PV. With the solar to hydrogen efficiency of 8.5%, we found that the rooftop installed PV-electrolyser system in Bandung City with supporting area with a radius of 500 m is potentially able to provide fuel for up to a hundred vehicles daily. Further, the potency of rooftop solar hydrogen generation was mapped.Pengembangan sistem produksi hidrogen sangat penting untuk mendukung pengoperasian kendaraan listrik di masa depan. Penelitian ini mempelajari potensi dari pemasangan sistem PV-PEM electrolyser yang terhubung dengan stasiun pengisian bahan bakar di area Kota Bandung. Kemiringan atap dan orientasi panel surya mempengaruhi jumlah energi listrik sebesar 0,8 – 4,2% dari panel surya yang dipasang secara horizontal. Dengan efisiensi solar-to-hydrogen sebesar 8,5%, atap perumahan yang terpasang sistem PV-PEM electrolyser di Kota Bandung dalam radius 500 m dapat menyediakan bahan bakar hingga seratus mobil listrik per hari. Penelitian ini mencakup pula pemetaan potensi produksi solar hydrogen di atap perumahan.
OPTIMIZING HYDROGEN PRODUCTION FROM THE PHOTOVOLTAIC-POWERED ALKALINE WATER ELECTROLYZER Pramujo Widiatmoko; Hary Devianto; Habibil Ghifary; Fran Felix Nurdiansyah; J.F. Simorangkir
Jurnal Teknologi Bahan dan Barang Teknik Vol 11, No 2 (2021)
Publisher : Balai Besar Bahan dan Barang Teknik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37209/jtbbt.v11i2.295

Abstract

Energy transition has arisen its attention towards hydrogen technology. Green hydrogen can be produced from renewable energy sources such as photovoltaic (PV) through water electrolysis. However, its efficiency needs to be improved due to the intermittent nature of the remote microgrids. This study focuses on the design of SEPIC DC/DC converter and alkaline water electrolytic cells configuration on a 175 Wp polycrystalline silicon PV module. A homemade alkaline water electrolyzer of 3 M KOH was used and modeled numerically on Simulink MATLAB software. The converter and electrolytic cells configuration were designed for 1000, 800, 600 and 400 W/m2 solar irradiances. The results indicate that the required inductor decreased from 2.2 mH to 1.1 mH while the required capacitor increased from 10 mF to 27 mF as the solar irradiance increased. In a dynamic condition, the converter efficiency reached a maximum of 94.35%. Further, hydrogen production achieves 4.81 to 5.93 kg-H2/year as the installed electrolytic cell’s capacity increased from 70.2 to 174.9 W. The Levelized Cost of Hydrogen under unlimited photovoltaic power capacity is 13.08 USD/ kg-H­2
Performance Evaluation of An Electrolyte-Supported Intermediate-Temperature Solid Oxide Fuel Cell (IT-SOFC) with Low-Cost Materials Fauzi Yusupandi; Hary Devianto; Pramujo Widiatmoko; Isdiriayani Nurdin; Sung Pil Yoon; Tae-Hoon Lim; Aditya Farhan Arif
International Journal of Renewable Energy Development Vol 11, No 4 (2022): November 2022
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.46735

Abstract

Intermediate temperature solid oxide fuel cell (IT-SOFC) provides economic and technical advantages over the conventional SOFC because of the wider material use, lower fabrication cost and longer lifetime of the cell components. In this work, we fabricated electrolyte-supported IT-SOFC using low-cost materials such as calcia-stabilized zirconia (CSZ) electrolyte fabricated by dry-pressing, NiO-CSZ anode and Ca3Co1.9Zn0.1O6 (CCZO) cathode produced through brush coating technique. According to the XRD result, the monoclinic phase dominated over the cubic phase, and the relative density of the electrolyte was low but the hardness of the CSZ electrolyte was close to the hardness of commercial 8YSZ electrolyte. The performance of the single cell was performed with hydrogen ambient air. An open-circuit voltage (OCV) of 0.43, 0.46, and 0.45 V and a maximum power density of 0.14, 0.50, and 1.00 mW/cm2 were achieved at the operating temperature of 600, 700, and 800 °C, respectively. The ohmic resistance of the cell at 700 and 800 °C achieved 81.5 and 33.00 Ω, respectively due to the contribution of thick electrolyte and Cr poisoning in electrodes and electrolyte
Synthesis and Characterization of Hydrochar and Bio-oil from Hydrothermal Carbonization of Sargassum sp. using Choline Chloride (ChCl) Catalyst Heri Rustamaji; Tirto Prakoso; Jenny Rizkiana; Hary Devianto; Pramujo Widiatmoko; Guoqing Guan
International Journal of Renewable Energy Development Vol 11, No 2 (2022): May 2022
Publisher : Center of Biomass & Renewable Energy, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ijred.2022.42595

Abstract

The purpose of this study is to alter the biomass of Sargassum sp. into elective fills and high valuable biomaterials in a hydrothermal process at 200oC for 90 minutes, using ZnCl2 and CaCl2 activating agents, withChClas a catalyst. This method generatedthree primaryoutputs: hydrochar, bio-oil, and gasproducts. ChCl to water ratio varies from 1:3, 1:1, and 3:1. The hydrochar yield improved when the catalyst ratio was increased, but the bio-oil and gas yield declined. The highest hydrochar yields were 76.95, 63.25, and 44.16 percent in ZnCl2, CaCl2, and no activating agent samples, respectively.The porosity analysis observed mesopore structures with the most pore diameters between 3.9-5.2 nm with a surface area between 44.71-55.2. The attribute of interaction between activator and catalyst plays a role in pore formation. The hydrochar products with CaCl2 showed the best thermal stability. From the whole experiment, the optimum hydrochar yield (76.95%), optimum surface area (55.42 m2 g-1), and the increase in carbon content from 21.11 to 37.8% were achieved at the ratio of ChCl to water was three, and the activating agent of ZnCl2. The predominant bio-oil components were hexadecane, hexadecanoic, and 9-octadecenoic acids, with a composition of 51.65, 21.44, and 9.87%, respectively the remaining contained aromatic alkanes and other fatty acids. The findings of this study reported that adding activating agents and catalysts improve hydrochar yield and characteristics of hydrochar and bio-oil products, suggesting the potential of hydrochar as a solid fuel or biomaterial and bio-oil as liquid biofuel
Heavy hydrocarbon recovery with integration of turboexpander and JT valve from highly CO2-containing natural gas for gas transmission pipeline Yusupandi, Fauzi; Widiatmoko, Pramujo; Sukmana, Ira Febrianty; Fitri, Hera Rahma; Eviani, Mitra; Devianto, Hary
Jurnal Rekayasa Proses Vol 17, No 2 (2023)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.82485

Abstract

Demand of natural gas is predicted to increase since many valuable products can be produced. Water and heavy hydrocarbon content are the key for gas pipeline facility. To meet requirement of natural gas transportation, dehydration unit (DHU) and hydrocarbon dew point control unit (DPCU) are necessary to avoid water and hydrocarbon condensation during transmission. The conventional dehydration technology, TEG contactor, can lower water content from 1,304 mg/m3 to 80.35 mg/m3 where the maximum limit of water content in natural gas is 97 mg/m3 to prevent hydrate formation. DPCU is installed to remove heavy hydrocarbon, especially C5+. Integration of JT valve and turboexpander was employed to obtain the low gas dew point. The hot gas stream that entered the JT valve was observed. The lower hot bypass gas was applied, the lower hydrocarbon dew point and the more condensate flowrate was achieved. indohoki77 adalah salah satu platform judi online terkemuka yang menyediakan berbagai jenis permainan bagi para penggemar judi di Indonesia.The highest power generation can be gained at low hot gas flow ratio which also influenced the exit pressure and temperature of compressor. In pipeline simulation, the pressure and temperature drop occurred at the high hot gas rate. To examine the arrival condition, dew point curves were generated and showed that the limitation of hot gas flow ratio has to be below 0.6 to prevent heavy hydrocarbon condensation in pipeline.
Karakterisasi Fotokatalis Untuk Fotoreduksi Karbon Dioksida Menjadi Asam Format Dalam Fasa Akuatik Rizkiana, Jenny; Devianto, Hary; Soerawidjaja, Tatang Hernas
Indonesian Journal of Chemical Research Vol 8 No 1 (2020): Edisi Bulan Mei (Edition for May)
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2020.8-jen

Abstract

Photoreduction of carbon dioxide is one of the promising method to reduce green house gas emission. Carbon dioxide can be converted into organic chemical that has higher economic value by utilizing light energy. One of the favorable product is formic acid which is can be used as hydrogen-carrier. For this process, photocatalyst plays important role as it can increase the rate of reaction and as well as the selectivity as such more desirable product can be produced. The objective of present study is to develop photocatalyst which can significantly catalyze the photoreduction process of CO2 to form formic acid. Zinc titanate doped with aluminium is used as the base photocatalyst. Photoreduction process is held in room condition using three 2800 lm lamp. Qualitative analysis of the product is done by silver solid test and acidity test while quantitative analysis is done by High Performance Liquid Chromatography (HPLC) test. The silver solid test results confirm that formic acid is formed during process. Based on acidity profile data, anthocyanin as photosensitizer could increase higher acidity in the mixture than melanin. However, the concentration of formic acid in the solution is still very low so that it cannot be detected by HPLC.
Heavy hydrocarbon recovery with integration of turboexpander and JT valve from highly CO2-containing natural gas for gas transmission pipeline Yusupandi, Fauzi; Widiatmoko, Pramujo; Sukmana, Ira Febrianty; Fitri, Hera Rahma; Eviani, Mitra; Devianto, Hary
Jurnal Rekayasa Proses Vol 17, No 2 (2023)
Publisher : Departemen Teknik Kimia Fakultas Teknik Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jrekpros.82485

Abstract

Demand of natural gas is predicted to increase since many valuable products can be produced. Water and heavy hydrocarbon content are the key for gas pipeline facility. To meet requirement of natural gas transportation, dehydration unit (DHU) and hydrocarbon dew point control unit (DPCU) are necessary to avoid water and hydrocarbon condensation during transmission. The conventional dehydration technology, TEG contactor, can lower water content from 1,304 mg/m3 to 80.35 mg/m3 where the maximum limit of water content in natural gas is 97 mg/m3 to prevent hydrate formation. DPCU is installed to remove heavy hydrocarbon, especially C5+. Integration of JT valve and turboexpander was employed to obtain the low gas dew point. The hot gas stream that entered the JT valve was observed. The lower hot bypass gas was applied, the lower hydrocarbon dew point and the more condensate flowrate was achieved. indohoki77 adalah salah satu platform judi online terkemuka yang menyediakan berbagai jenis permainan bagi para penggemar judi di Indonesia.The highest power generation can be gained at low hot gas flow ratio which also influenced the exit pressure and temperature of compressor. In pipeline simulation, the pressure and temperature drop occurred at the high hot gas rate. To examine the arrival condition, dew point curves were generated and showed that the limitation of hot gas flow ratio has to be below 0.6 to prevent heavy hydrocarbon condensation in pipeline.
Co-Authors Aditya Farhan Arif Adriaan Adriaan Adriaan Adriaan Adriaan, Adriaan Aghietyas Choirun Az Zahra Aida Nur Ramadhani Al-Aziz, Rd. Habib R. M. T. Ananda, Wisnu Anastasia Yuandy Anies Mutiari Anna Sonya Asoka Ardian Dwi Prakoso Ardiyan Harimawan Ardiyan Harimawan Aryan Fathoni Amri Aslan, Christian Auliardi, Dzaky Bork Ilsemann Brammantyo Nugroho Dadan Kusdiana Dadan Kusdiana Daniel Yonathan, Daniel DARMANSYAH . Dian Shofinita Dicky Tri Jatmiko Dwiwahju Sasongko Eviani, Mitra Fauzi Yusupandi Fauzi Yusupandi Febriyanto, Pramahadi Ferdyan Ihza Akbar Fitri, Hera Rahma Fran Felix Nurdiansyah Gatalie, Kreszen Livianus Guan, Guoqing Guoqing Guan Gusnawan, Pri Januar Habibil Ghifary Harimawan, Ardiyan Henry Natanail Purwito Heri Rustamaji Hilham Zamriko Koto Ida Bagus Oka Lyong Budhatama Ignatius Chandra Kurniawan Ilsemann, Bork Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin Isdiriayani Nurdin J.F. Simorangkir James B. Winterburn Jenny Rizkiana Jerry Jerry Josephine Christine Utomo Junaidi Junaidi Khodiyat, Nicholas Koto, Hilham Zamriko Listiani Artha Melanie, Susiana Mhd Ridho Utomo Mike Reich Mirwan Prasetiyo Soeweify Mitra Eviani Mitra Eviani Muhammad Irfan Rafi Muhammad Mara Ikhsan Muki Satya Permana Mutiari, Anies Nainggolan, Irwan Firmanto Nurdin, Isdiriayani Nurdin, Isdiriayani Permana, Indra Setia Pramahadi Febriyanto Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pramujo Widiatmoko Pusparizkita, Yustina Metanoia Rd. Habib R. M. T. Al-Aziz Reich, Mike Rendy Rendy Ridho Eka Yandra Rizkiana, Jenny Rizky Eka Ahmad Saputera, Wibawa Hendra Satria, Arysca Wisnu Saumi Febrianti Khairunnisa Schmahl, Wolfgang Setiadi, Tjandra Setyo Yanus Sasongko Shofinita, Dian Simparmin br Ginting Sukmana, Ira Febrianty Sung Pil Yoon Susiana Melanie Tae-Hoon Lim Tatang Hernas Soerawidjaja Tatto Bustomi Thadeo, Francesco Tiara Calista Shandy Tirto Prakoso Tjandra Setiadi Uli, Rospita Utomo, Mhd Ridho Vita Wonoputri Wahyudi, Farizky Widiatmoko, Pramujo Winterburn, James B. Wisnu Ananda Wolfgang Schmahl Wolfgang Schmahl Yandra, Ridho Eka Yustina Metanoia Pusparizkita Yustina Metanoia Pusparizkita Yusupandi, Fauzi