Highly efficient and durable Y(OH)3/rGO/Pt ternary hybrid electro-catalyst for the methanol oxidation reaction

Abstract

Tailoring highly durable and active anode catalysts is currently the primary concern to the commercial viability of direct methanol fuel cells (DMFC). Herein, we report a ternary hybrid electro-catalyst, Y(OH)3/rGO/Pt, with excellent MOR activity and durability compared to commercial Pt/C for the first time. Y(OH)3 on reduced graphene oxide is chosen as the catalyst support for Pt to improve its electrocatalytic activity and tolerance towards the carbonaceous intermediates formed during MOR. Pt, along with Y(OH)3/rGO support, exhibits a mass activity of 230 mA/mg with an onset potential of 0.58 V (vs. RHE), which is 4.5 times greater than that of commercial Pt/C (51.55 mA/mg, 0.69 V). If/Ib ratio and the electrochemical active surface area are increased on employing Y(OH)3/rGO as catalyst support to Pt. The enhanced catalytic activity is attributed to the synergistic effect between highly conductive rGO matrix, intermediate poisoning tolerant Y(OH)3, and Pt catalyst. A significant decrease in MOR activity was observed after calcining the Y(OH)3/rGO/Pt catalyst due to the reduction in surface Y-OH groups.