The cost of fuel cell systems can be largely reduced by developing hydroxide exchange membrane fuel cells (HEMFCs) based on platinum group metal-free (PGM-free) catalysts. However, the sluggish hydrogen oxidation reaction (HOR) in alkaline electrolytes forces HEMFCs to use higher PGM loadings at the anode than proton exchange membrane fuel cells to sustain the desired power densities. Here we report nickel–molybdenum–niobium metallic glasses as PGM-free HOR catalysts. The optimal Ni₅₂Mo₁₃Nb₃₅ metallic glass exhibits an intrinsic exchange current density of 0.35 mA cm⁻², outperforming that of a Pt disk catalyst (0.30 mA cm⁻²). This catalyst also shows remarkable robustness in alkaline electrolyte with a wide stability window up to 0.8 V versus the reversible hydrogen electrode. When used as the anode, this catalyst enables power densities of 390 mW cm⁻² in H₂/O₂ fuel cells and 253 mW cm⁻² in H₂/air fuel cells, and shows negligible performance degradation over 50 h and 30 h, respectively.

通过开发基于无铂族金属 (PGM-free) 催化剂的氢氧化物交换膜燃料电池 (HEMFC) 可以大大降低燃料电池系统的成本。然而，碱性电解质中缓慢的氢氧化反应 (HOR) 迫使 HEMFC 在阳极使用比质子交换膜燃料电池更高的 PGM 负载量来维持所需的功率密度。在这里，我们报告了镍-钼-铌金属玻璃作为不含 PGM 的 HOR 催化剂。最佳的Ni ₅₂ Mo ₁₃ Nb _{35金属玻璃表现出0.35 mA cm} ^-2的固有交换电流密度，优于Pt盘催化剂（0.30 mA cm ^-2）。与可逆氢电极相比，该催化剂在碱性电解质中也显示出显着的稳定性，具有高达 0.8 V 的宽稳定性窗口。当用作阳极时，该催化剂在 H ₂ /O _{2燃料电池中实现了 390 mW cm} ^-2的功率密度，在 H ₂ /空气燃料电池中实现了253 mW cm ^-2的功率密度，并且在 50 小时和 30 小时内表现出可忽略不计的性能下降， 分别。