Commercial Pt/C is the best electrocatalyst for electrocatalytic hydrogen evolution due to its high activity and fast electron transfer kinetics. However, the poor stability under high current density and high cost limits its large-scale application. Here, we managed to fabricate a stable catalyst where MoO_x stabilized Pt nanoparticles is supported on Ketjen Black via impregnation–annealing method. This catalyst exhibited a low overpotential of 4 mV (@10 mA cm⁻²) and 29 mV (@100 mA cm⁻²) and considerable long-term stability for 100 h toward acid hydrogen evolution reaction, outperforming commercial 20 wt% Pt/C. The excellent catalytic performances can be assigned to the existence of amorphous MoO_x which can transport electrons to Pt nanoparticles and prevent Pt nanoparticles from agglomeration. This work provided a simple synthesis strategy to synthesize an amorphous MoO_x protected Pt nanoparticles catalyst with good activity and stability, which can be an alternative to commercial Pt/C for acid hydrogen evolution reaction.

中文翻译：

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通过 Pt 纳米粒子和无定形 MoOx 之间强金属-载体相互作用，打破酸析氢的活性和稳定性瓶颈

商业 Pt/C 因其高活性和快速电子转移动力学而成为电催化析氢的最佳电催化剂。但高电流密度下的稳定性差和成本高限制了其大规模应用。在这里，我们成功地制造了一种稳定的催化剂，其中 MoO _x稳定的 Pt 纳米颗粒通过浸渍-退火方法负载在科琴黑上。^{该催化剂表现出4 mV（@10 mA cm -2}）和29 mV（@100 mA cm ^-2 ）的低过电势，并且在100小时内对酸析氢反应具有相当大的长期稳定性，优于商用20 wt% Pt/ C。优异的催化性能归因于无定形MoO _x的存在，它可以将电子传输到Pt纳米颗粒并防止Pt纳米颗粒团聚。这项工作提供了一种简单的合成策略来合成具有良好活性和稳定性的非晶MoO _x保护的Pt纳米颗粒催化剂，该催化剂可以替代商业Pt/C用于酸析氢反应。