Porous Mo2C-MoP Heterostructure on Carbon Cloth for Efficient Hydrogen Evolution Reaction over a Broad pH Range
Porous Mo2C-MoP Heterostructure on Carbon Cloth for Efficient Hydrogen Evolution Reaction over a Broad pH Range
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碳布上的多孔 Mo2C-MoP 异质结构可在较宽的 pH 范围内实现高效的析氢反应
DOI：
10.1002/cctc.202001639
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发表时间：
2021
期刊：
影响因子：
4.5
通讯作者：
Gao Bo
中科院分区：
文献类型：
--
作者：
He Mengci;Shi Hongyan;Sun Xiudong;Gao Bo
由于界面上的协同效应，由不同活性材料组成的异质结构是提高催化剂HER性能的重要策略。在这里，我们通过用红磷粉末磷化多孔 β-Mo2C 纳米结构合成了 Mo2C−MoP 异质结构。 XRD、Raman、XPS、SEM 和 TEM 结果表明，在 550°C 的碳布上获得了具有多孔纳米结构的 Mo2C−MoP 异质结构（MoCP-550），在较宽的 pH 范围内表现出显着的 HER 活性。在 1.0 M KOH 中实现了 51 mV 的低 η10 和 56.7 mV dec−1 的小塔菲尔斜率，在 0.5 M H2SO4 中实现了 82 mV 的低 η10 和 49.8 mV dec−1 的小塔菲尔斜率。 MoCP-550 在碱性和酸性电解质中也表现出优异的电催化稳定性。密度泛函理论（DFT）计算表明，与纯Mo2C和纯MoP相比，Mo2C−MoP异质结构具有更合适的H*吸附自由能。
Heterogeneous structure composed of different active materials is an important strategy to improve the HER performance of catalysts, due to the synergistic effects on the interface. Here, we synthesized a Mo2C−MoP heterostructure by phosphating porous β‐Mo2C nanostructures with red phosphorus powder. XRD, Raman, XPS, SEM and TEM results suggested that Mo2C−MoP heterostructure with porous nanostructures were obtained on carbon cloth at 550 °C (MoCP‐550), which showed remarkable HER activity over a broad pH range. A lowη10of 51 mV and a small Tafel slope of 56.7 mV dec−1was achieved in 1.0 M KOH, and a lowη10of 82 mV and a small Tafel slope of 49.8 mV dec−1in 0.5 M H2SO4. MoCP‐550 also exhibited excellent electrocatalytic stability in both alkaline and acidic electrolytes. Density functional theory (DFT) calculations identified that Mo2C−MoP heterostructure has more suitable H*adsorption free energy compared to pure Mo2C and pure MoP.