One of the major challenges associated with fuel cells is exploring highly efficient and low-cost electrocatalysts for the oxygen reduction reaction (ORR). Herein, the feasibility of using Ti 3 C 2 MXene nanoparticles (NPs) to enhance the electrocatalytic activity of g-C 3 N 4 for ORR was investigated. By varying the content of Ti 3 C 2 NPs, a series of g-C 3 N 4 /Ti 3 C 2 heterostructures were obtained, displaying enhanced electrocatalytic activity, including a positive shift in both onset and peak potentials toward ORR, compared to the original g-C 3 N 4 in basic solution. We attribute the improvement to the favorable electrical conductivity of welldispersed Ti 3 C 2 MXene nanoparticles and also enhanced O 2 adsorption due to the electronic coupling effect between g-C 3 N 4 and Ti 3 C 2 in the heterostructures. This work demonstrates the potential of earth-abundant MXene family materials to construct low-cost and high-performance electrocatalysts.

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The synergistic effect between Mo–Co in Co3Mo3N leads to its enhanced catalytic activity and stability in CO2 reforming of methane.

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