ANALYSIS OF CURRENT DENSITY ON MODIFIED CATALYSTS PT/C AND PT-CO/C BY SINGLE-PROTON EXCHANGE MEMBRANE FUEL CELL (PEMFC) - Eniya Listiani Dewi; Tahta Muslim Karim; Liana Christiani; Mirzan T. Razzak (Jurnal Energi dan Lingkungan (Enerlink), 2014)