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Chemistry and Materials
Published by The Center for Science Innovation
ISSN : 2828271X     EISSN : 28282310     DOI : https://doi.org/10.56425/cma
Core Subject : Science,
Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology
Chemistry and Materials is a peer-reviewed journal published by The Center for Science Innovation (Pusat Inovasi Sains). The journal covers all aspects of Chemistry and Materials including synthesis, characterization, and applications. Theoretical and computational studies are also welcome.
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 52 Documents
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Analysis of Nickel(II) in Water Medium using Electrochemical Techniques Gayatri Citra Dewi; Odetta Levin
Chemistry and Materials Vol. 2 No. 1 (2023)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1035.693 KB) | DOI: 10.56425/cma.v2i1.49

Abstract

Nickel (Ni) is a highly toxic heavy metal because nickel can accumulate and poison aquatic biotic components, therefore it’s levels must be determined with certainty. In this study, nickel metal measurements were made using the cyclic voltammetry method. Several measurement parameters, including voltage range, scan rate, and pH, were tested in this study to improve sensitivity and accuracy. This is done to achieve the best possible measurement conditions. The results show that the best conditions for detecting Ni ions are a voltage range of -0.75 V to -1.00 V, a scan rate of 250 mV/s, and a pH of 3. The validation test produced results in the range of 15 to 40 mM with a correlation coefficient of 0.99, detection and quantitation limits of 274.99 ppm and 916.66 ppm, respectively, and an RSD of 1.10%. As a comparison, Ni content was tested using AAS, and the Ni contents obtained by cyclic voltammetry and AAS methods were 1666.47 and 1676 ppm, respectively.
Electrodeposition of CoxNiy Thin Film and Its Catalytic Activity for Ethanol Electrooxidation Hilman Syafei; Dwi Giwang Kurniawan
Chemistry and Materials Vol. 2 No. 1 (2023)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1331.503 KB) | DOI: 10.56425/cma.v2i1.50

Abstract

Platinum is often used as a catalyst in ethanol electrooxidation. Still, it has many disadvantages being expensive and its active site can be poisoned by CO. Transition metal of Co and Ni can become a catalyst in alcohol electrooxidation at a lower cost to synthesize. In this work, bimetallic CoNi were successfully prepared by electrodeposition method with different Co/Ni ratios to enhance ethanol electrooxidation. Samples of CoNi are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and electrochemical impedance spectroscopy (EIS). XRD diffractogram confirmed the formation of CoNi. Morphology of CoNi in SEM characterization showed that CoNi with ratio 5:1 has the more dispersed particle and the greatest surface area. EDX characterization indicated that the relative weight of different Co/Ni ratios, the composition wt.% Co is 81.15% and wt.% Ni is 18.85% in CoNi 5:1, wt.% Co is 60.96% and wt.% Ni is 30.94% in CoNi 2:5, while wt.% Co is 50.19%, and wt.% Ni is 49.81% in CoNi 5:5. EIS characterization showed that CoNi with ratio of 5:1 has faster electron kinetics. Electrooxidation of ethanol used cyclic voltammetry (CV) method. The best results from the ethanol electrooxidation reaction were obtained for CoNi with a ratio of 5:1 because of the greatest surface area that showed in scanning electron microscopy and fast electron transfer kinetics compared to others ratio of CoxNiy.
Cocoa Powder Antioxidant Activity Test Using Cyclic Voltammetry and Differential Pulse Voltammetry Methods Anis Sakinah; Ibrahim Dhuafa Fikri
Chemistry and Materials Vol. 2 No. 2 (2023)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v2i2.51

Abstract

The main antioxidant compounds contained in cocoa are polyphenols, including flavonoids such as epicatechin, catechin, and procyanidin. This study aims to determine the antioxidant activity of three samples of cocoa powder using 1,1-diphenyl-2-picrylhydrazyl (DPPH) as a free radical by electroanalytical methods, namely cyclic voltammetry (CV) and differential pulse voltammetry (DPV). From the CV information obtained, the first anodic peak from DPPH appears at a potential of 0.33 V with an anodic current of 2.75 A/cm2, while the first anodic peak at DPPH after adding the chocolate sample which has the highest antioxidant activity appears at a potential of 0.43 V with an anodic current of 4.60 A/cm2. From the DPV information obtained, the anodic peak of DPPH appears at a potential of 0.19 V at an anodic current of 2.11 mA, while the anodic peak at DPPH after adding the chocolate sample which has the highest antioxidant activity appears at a potential of 0.02 V at an anodic current of 1.97 mA. The results show that the electroanalytical method has the potential to analyze the antioxidant activity of cocoa powder samples.
Analysis of Cobalt(II) and Nickel(II) in Water Medium using Voltammetry Techniques Devi Aliefiyardi Aulia Widowati; Fanny Kurniawan; Shynta Ramadhan
Chemistry and Materials Vol. 2 No. 2 (2023)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v2i2.52

Abstract

Currently, the electrochemical method as one of the fast, accurate, and reliable techniques for detecting heavy metals such as Co and Ni has been widely developed. Cyclic voltammetry methodology was successfully employed for determination of trace cobalt (Co) and nickel (Ni). Co and Ni levels are studied because they can cause water pollution and can be toxic, and non-biodegradable which influences the health of living things. To obtain results with high accuracy, this study tested several electrochemical parameters. Based on the results processed, the CoNi level in the solution can be measured well in the voltage range, scan rate, and pH of the solution, respectively, at -1.00 V to 0.75 V, 250 mV/s, and pH 3 (Ni) and pH 7 (Co). This work have been validated and showed good results with correlation coefficients of Co and Ni. The detection limit and quantity limit for Co and Ni were 510.2 ppm and 723.5 ppm, respectively, with 274.99 ppm and 916.66 ppm. Co and Ni metal RSDs also showed good values (<5%). In this study, Co and Ni levels in lab waste obtained by the cyclic voltammetry method were 510.2 ppm and 1666.47 ppm, and the results obtained from atomic absorption spectroscopy (AAS) measurements of 510.7 ppm and 1676 ppm. The developed electrochemical systems based are giving new inputs to the existing devices or leading to the development of novel heavy metal detection tools with interest for applications in fields such as environmental, safety, security controls or other industries.
Effect of Deposition Potential on ZnNi Coating Corrosion Behaviour Kendai Marcelli; Mega Gladiani Sutrisno
Chemistry and Materials Vol. 2 No. 2 (2023)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v2i2.57

Abstract

ZnNi coatings were deposited using the electrochemical deposition method. In this study, the effect of potential electrodeposition on deposited properties, morphology, and size of ZnNi alloy nanoparticles was investigated in detail. The as-synthesized products were characterized by ZnNi coating properties is characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM),  energy dispersive X-ray spectroscopy (EDX), and electrochemical impedance spectroscopy (EIS).  The result indicated that the electrodeposition processes of ZnNi were governed by a nucleation process controlled by diffusion. XRD results showed that the phase structure of both alloy and composite coatings was single ZnNi phase. Potential increase influences the larger crystal size and the surface of coating was compact and uniform, the Rct increase, and greater the icorr so that the possibility of corrosion is higher.
PtAu Nanoparticle as a Catalyst for Ethanol Electrooxidation Amelia Sabella; Annisa Auliya
Chemistry and Materials Vol. 2 No. 2 (2023)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v2i2.58

Abstract

In this work, PtAu nanoparticles were successfully synthesized using the electrodeposition technique. The nanoparticles obtained were irregularly spherical in shape and in the size range of 20-200 nm. X-ray diffraction (XRD) confirmed that the formed PtAu nanoparticles were alloys, because they showed a peak of 2θ in the region between Pt and Au metals, namely at 2θ 39.15˚ and 45.53˚. The cyclic voltammetry (CV) test showed that the PtAu catalyst has an ethanol electrooxidation activity of 22.9 mA/cm2, 11 times higher than the Pt catalyst previously synthesized using the same technique and conditions. In addition, at 300–1000 cycles the ethanol electrooxidation performance is fairly constant, indicating that this catalyst is quite stable. Interestingly alloying Pt with Au also increases the poisoning resistance of the catalyst from CO or other intermediate species. Thus, the use of PtAu catalysts can effectively increase catalytic activity, maintain stability of the catalyst, and reduce the possibility of poisoning by intermediate species.
Scan rate Dependent Factor for Antioxidant Activity of Gold Nanofilms Synthesized via Cyclic Voltammetry Technique Babay Asih Suliasih; Dwi Giwang Kurniawan; Annisa Auliya; Marissa Angelina
Chemistry and Materials Vol. 2 No. 2 (2023)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v2i2.60

Abstract

Gold nanoparticles (AuNPs) were found to act as antioxidants owing to their inert, high stability, biocompatibility, and non-cytotoxic. The present investigation involved the synthesis of gold nanoparticles through the electrodeposition technique on a substrate comprising Fluorine-doped Tin Oxide (FTO). By manipulating the scan rate parameter, an effective approach can be employed to facilitate precise management of particle morphology and size. The obtained shape of AuNPs were spherical and irregular. In this study, it was observed that gold nanoparticles elicited potent inhibition, particularly at a scan rate of 150 mV/s, with a markedly high inhibition value of 41.27%. The outcome was further supported by an augmented particle distribution density per unit area, which measured as 149,635,036.5/mm².
Nickel Oxide (NiO) Thin Film Synthesis via Electrodeposition for Methylene Blue Photodegradation Mokhamad Ali Rizqi Maulana; Aisyaturridha; Salmah Cholilah; Fitria Dwi Arista; Bagus Nur Listiyono
Chemistry and Materials Vol. 2 No. 3 (2023)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v2i3.62

Abstract

Nickel oxide (NiO) is an ideal photocatalyst material for methylene blue photodegradation. NiO is known to have high photocatalytic activity, good stability, and non-toxic properties. However, conventional NiO thin film synthesis methods are inefficient because require high temperatures, complex equipment operations, and volatile precursor solutions. Therefore, in this study, NiO was synthesized by the electrodeposition method and then applied for methylene blue photodegradation. NiO thin film's morphological structure and elemental composition percentage were characterized by field emission scanning electron microscopy and energy-dispersive X-ray spectroscopy, respectively. Meanwhile, the crystal structure was characterized using an X-ray diffractometer. Several electrochemical and photodegradation tests were conducted to analyze the performance of the NiO photocatalyst. The results showed NiO was successfully synthesized using the electrodeposition method.  The morphology of NiO was a coral-like structure. A sharp diffraction peak with high intensity at 2  with 43.28° indicates a well-ordered crystalline of NiO. The maximum photocurrent density generated from the photoelectrochemical test was 0.1287 mA/cm2. The small charge transfer resistance value (1353.6 Ω) confirmed from the electrochemical impedance spectroscopy test indicates low charge transfer resistance. Percent photodegradation of methylene blue was obtained at 65% in 100 min, which indicated good photocatalytic activity.
Electrodeposition of CoNi Bimetallic Catalyst for Ethanol Electrooxidation Application Abdul Asywalul Fazri; Alvida Nor Puspita; Selvia Ningsih; Annisa Auliya
Chemistry and Materials Vol. 2 No. 3 (2023)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v2i3.63

Abstract

Platinum is potentially employed as a catalyst in direct ethanol fuel cells (DEFCs). However, its scarcity and susceptibility to carbon monoxide poisoning give rise to novel challenges necessitating resolution. Transition metals such as nickel and cobalt are regarded as highly auspicious catalysts for DEFCs due to their perceived potential to reduce the expenditure associated with the synthesis procedure. In the present investigation, the synthesis of a cobalt-nickel (CoNi) catalyst with bimetallic properties was effectively accomplished through the electrodeposition technique utilizing the stimulator mode. Subsequently, an evaluation was conducted to assess the catalyst's proficiency in ethanol electrooxidation. The CoNi samples underwent comprehensive characterization through the utilization of various analytical techniques, namely X-ray diffraction (XRD), scanning electron microscopy (SEM), elemental dispersive X-ray analysis, and electrochemical impedance spectroscopy (EIS). The XRD analysis confirmed the formation of CoNi, while the SEM characterization demonstrated that the CoNi samples exhibited a homogeneous morphological feature. The impedance measured by the EIS technique displayed a resistance to charge transfer value of 21.21 kΩ, while the solution resistance value amounted to 66.67 kΩ. The catalytic efficiency of the specimens in ethanol electrooxidation was evaluated using the cyclic voltammetry technique, resulting in a peak current density of 3.14 mA/cm2 proving the potential of bimetallic CoNi to be a low-cost catalyst for ethanol electrooxidation process.
Synthesis of CoNi by Electrodeposition Technique and its Application as an Electrocatalyst for Water Splitting Chika Shafa Maura; Muhammad Fathar Aulia; Raudhatul Hadawiyah; Wulan Kharisma Dera; Hilman Syafei
Chemistry and Materials Vol. 2 No. 3 (2023)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v2i3.64

Abstract

Water splitting is regarded as a highly efficacious methodology for obtaining hydrogen, intending to be employed for the purpose of renewable fuel production. However, the performance of this technique is constrained by the sluggish kinetics of the hydrogen evolution reaction in alkaline environments and the oxygen evolution reaction, which leads to significant energy inefficiency and excessive potential requirements. To enhance the reaction kinetics and efficiency of water splitting, there exists a pertinent requirement for an electrocatalyst that exhibits commendable efficiency. The primary objective of this study is to construct a cobalt-nickel (CoNi) electrocatalyst that facilitates water splitting. The present study employs the technique of electrodeposition for its experimental procedures. The findings of the study indicated that the CoNi sample, as observed through scanning electron microscopy with energy dispersive X-ray spectroscopy (EDX) analysis, exhibited a flattened, circular form and agglomeration. The EDX analysis yielded elemental composition results indicating a cobalt content of 20.51% and nickel content of 79.49% The X-ray diffractometer analysis reveals that the CoNi metal alloy has manifested a crystalline structure with a cubic configuration. The electrochemical impedance spectroscopy found that the charge transfer resistance of CoNi with the electrolyte solution was 1.48 kΩ. The data collected from the chronoamperometry test indicates the presence of a consistent and unchanging electrical current. Additionally, the cyclic voltammetry test presented Epa and Epc values of 0.4469 V and 0.3037 V, respectively, leading to a calculated ∆E of 0.1432 V. The research findings establish that the CoNi alloy, synthesized via the electrodeposition technique, exhibited a performance-effective electrocatalyst that closely approached the desired outcome.    

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