The hydrogen evolution reaction (HER) based on electrochemical water splitting is considered a promising strategy to produce clean and sustainable hydrogen energy. Searching for non-noble metal based electrocatalysts with high efficiency and durability toward the HER is vitally necessary. In this work, we report a novel method for synthesizing molybdenum phosphide (MoP) supported on multiscale porous honeycomb carbon (MoP@HCC) and the application of this catalyst material in acidic media for water electrolysis. Due to the unique structure of the catalyst material, the as-prepared MoP@HCC shows remarkable electrocatalytic activity and stability in 0.5 M H₂SO₄ aqueous solution. The hybrid catalyst could deliver a current density of 10 mA cm⁻² at a low overpotential of 129 mV, with an onset overpotential of 69 mV and a Tafel slope of 48 mV dec⁻¹, outperforming most of the current noble-metal-free electrocatalysts. This study demonstrates an effective way for multiscale control of the MoP structure via overall consideration of the mass transport, and the accessibility, quantity and capability of active sites toward the HER.

中文翻译：

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蜂窝结构的多尺度多孔磷化钼可高效放氢†

基于电化学水分解的析氢反应（HER）被认为是产生清洁且可持续的氢能的有前途的策略。迫切需要寻找高效，耐用的非贵金属基电催化剂。在这项工作中，我们报告了一种合成多尺度多孔蜂窝碳（MoP @ HCC）上负载的磷化钼（MoP）的新方法，并且该催化剂材料在酸性介质中用于水电解。由于催化剂材料的独特结构，所制得的MoP @ HCC在0.5 MH ₂ SO ₄水溶液中显示出显着的电催化活性和稳定性。杂化催化剂可提供10 mA cm ^-2的电流密度在低过电势下为129 mV，起始过电势为69 mV，Tafel斜率为48 mV dec ^-1，胜过大多数当前的无贵金属电催化剂。这项研究展示了通过全面考虑质量传输以及活性位点对HER的可及性，数量和能力，对MoP结构进行多尺度控制的有效方法。