The development of an effective, non-precious electrocatalyst for hydrogen evolution reaction (HER) is highly desirable for electrocatalytic water splitting and electrochemical/photoelectrochemical water splitting to produce hydrogen. Herein, a facile one-step ultrasonic spray pyrolysis method is developed for the synthesis of MoO₂–MoC composite loaded on porous carbon (MoO₂/MoC@C), and the MoO₂/MoC@C is found to exhibit prominent catalytic activity in the HER. The overpotential required for a current density of 20 mA cm⁻² is as small as 133 mV in 0.5 M H₂SO₄ and 203 mV in 1 M KOH for the MoO₂/MoC@C, and the value is superiorly comparable to that of reported metal carbides. The MoO₂/MoC@C can work stably both in acidic and basic solution over 30 h with 95% faradaic efficiency in 0.5 M H₂SO₄ and 93% in 1 M KOH. The synergic effect between MoO₂ and MoC is suggested by density functional theory calculations.

中文翻译：

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负载在多孔碳上 的MoO ₂和MoC的纳米复合材料，是氢释放反应的有效电催化剂†

对于电催化水分解和产生氢的电化学/光电化学水分解，非常需要开发有效的，非贵重的用于氢析出反应（HER）的电催化剂。本文开发了一种简便的一步法超声喷雾热解法，用于合成负载在多孔碳（MoO ₂ / MoC @ C）上的MoO ₂ -MoC复合材料，发现MoO ₂ / MoC @ C具有突出的催化活性。在她的身上。对于MoO _2而言，电流密度为20 mA cm ^-2所需的过电势小至0.5 MH ₂ SO _4中的133 mV和1 M KOH中的203 mV。/ MoC @ C，该值可与已报道的金属碳化物媲美。MoO ₂ / MoC @ C可以在酸性和碱性溶液中稳定运行30个小时以上，在0.5 MH ₂ SO _4中的法拉第效率为95％，在1 M KOH中的为93％。密度泛函理论计算表明了MoO ₂和MoC的协同作用。