MXene (Ti3C2T x )-Supported Binary Co-, Zn-Doped Carbon as Oxygen Reduction Reaction Catalyst for Anion Exchange Membrane Fuel Cells

摘要

Transition metal-nitrogen-carbon materials are used as catalysts for the oxygen reduction reaction (ORR) because of their low cost, high activity, and stability in the alkaline medium. Herein, CoZn/nitrogen-carbon (NC)-Ti3C2 as an ORR electrocatalyst is prepared by one-step pyrolysis of zeolitic imidazolate framework (ZIF)-67/ZIF-8 on the Ti3C2 surface. The CoZn/NC-Ti3C2 catalyst presents considerable kinetics with a half-wave potential (E-1/2) of 0.847 V, and the fuel cell peak power density reaches 245 mW cm(-2). Furthermore, this catalyst exhibits an excellent stability with only 4.83% drop of relative current after 30000 s of testing. Herein, a new strategy for high-effective and high-stability non-precious metal catalysts for anion exchange membrane fuel cells is provided.

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