Co,N-Codoped Mesoporous Carbon As Efficient Bifunctional Catalysts for Oxygen Reduction and Hydrogen Evolution Reaction

Tuesday, 3 October 2017: 15:20
National Harbor 14 (Gaylord National Resort and Convention Center)
X. Liu and S. Zou (American University)
Pt-based catalysts have been extensively studied as polymer electrolyte fuel cell catalysts and hydrogen evolution reaction (HER) catalysts. However, the low abundance and high cost of these materials preclude their large-scale commercial applications. Alternative more sustainable catalysts are therefore needed. Various carbon-based materials have been demonstrated to have high oxygen reduction reaction activity especially in the alkaline media. In this work, we report a simple silica template approach to form porous carbon codoped with nitrogen and cobalt. The obtained porous carbon exhibited not only excellent electrocatalytic activities for ORR, which compare favorably with that of commercial Pt/C (20 wt%), but also superior durability and methanol tolerance. The porous carbon also possess superior performance for HER in acidic media, showing a low onset potential of only -0.04 V vs RHE, a Tafel slop of 57.4 mV dec-1, a current density of 10 mA cm-2 at -0.106 V vs RHE and remarkable durability. Thus, the Co, N-doped carbon holds great promise as bifunctional catalysts for regenerative fuel cells.