Exploring platinum-group-metal (PGM) free electrocatalysts for hydrogen oxidation reaction (HOR) in alkaline media is essential to the progress of anion exchange membrane fuel cells (AEMFCs). In this work, a Ni/MoO₂ heterostructure catalyst with comparable HOR activity in alkaline electrolyte with PGM catalyst was prepared by a simple hydrothermal-reduction method. Remarkably, the Ni/MoO₂ presents a mass kinetic current density of 38.5 mA mg_Ni⁻¹ at the overpotential of 50 mV, which is higher than that of the best PGM free HOR catalyst reported by far. Moreover, the HOR performance of Ni/MoO₂ under 100 ppm CO shows negligible fading, together with the superior durability, render it significant potential for application in AEMFCs. A particular mechanistic study indicates that the excellent HOR performance is ascribed to the accelerated Volmer step by the incorporation of MoO₂. The function of MoO₂ was further confirmed by CO striping experiment on Pt/C-MoO₂ that MoO₂ can facilitated OH adsorption thus accelerate the HOR process. On account of the high performance and low cost, the Ni/MoO₂ electrocatalyst encourages the establishment of high performance PGM free catalyst and shows significant potential for application in AEMFCs.

探索用于碱性介质中氢氧化反应（HOR）的不含铂族金属（PGM）的电催化剂对于阴离子交换膜燃料电池（AEMFC）的发展至关重要。在这项工作中，通过简单的水热还原法制备了在碱性电解质中具有与PGM催化剂相当的HOR活性的Ni / MoO ₂异质结构催化剂。值得注意的是，Ni / MoO ₂在50 mV的超电势下具有38.5 mA mg _Ni ^-1的质量动电流密度，这比迄今为止报道的最好的无PGM的HOR催化剂要高。此外，Ni / MoO ₂的HOR性能低于100 ppm的CO表现出微不足道的褪色，以及卓越的耐久性，使其具有在AEMFC中应用的巨大潜力。一项特殊的机理研究表明，优异的HOR性能归因于MoO ₂的掺入加快了沃尔默步骤。MoO ₂的功能通过在Pt / C-MoO ₂上的CO剥离实验进一步证实，MoO ₂可以促进OH的吸附，从而促进HOR过程。由于高性能和低成本，Ni / MoO ₂电催化剂鼓励建立高性能的无PGM催化剂，并显示出在AEMFC中的巨大应用潜力。