IrMo Nanocatalysts for Efficient Alkaline Hydrogen Electrocatalysis,ACS Catalysis

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IrMo Nanocatalysts for Efficient Alkaline Hydrogen Electrocatalysis
ACS Catalysis ( IF 11.3 ) Pub Date : 2020-06-17 , DOI: 10.1021/acscatal.0c02254
Luhong Fu ₁ , Yunbo Li ₁ , Na Yao ₁ , Fulin Yang ₁ , Gongzhen Cheng ₁ , Wei Luo _{1,

2}

Affiliation

Developing highly efficient electrocatalysts and fundamentally understanding the mechanisms for alkaline hydrogen electrode reactions, including the hydrogen oxidation reaction (HOR) and the hydrogen evolution reaction (HER), are highly desirable. Here we report the synthesis of the IrMo alloy nanocatalyst and its outstanding HOR/HER performances under alkaline media. Specifically, the IrMo_0.59 exhibits the highest catalytic activities, which are 5 times higher than that of Ir and commercial Pt/C toward HOR and even a 10-fold enhancement toward HER. Density functional theory (DFT) calculations reveal that H₂O-occupied Mo sites on the surface of IrMo could effectively optimize the free energies of *H₂O and *OH, thereby enable IrMo following the so-called bifunctional mechanism both in alkaline HER/HOR electrolysis.

中文翻译：

IrMo纳米催化剂用于高效碱性氢电催化

非常需要开发高效的电催化剂并从根本上理解碱性氢电极反应的机理，包括氢氧化反应（HOR）和氢释放反应（HER）。在这里，我们报告了IrMo合金纳米催化剂的合成及其在碱性介质下出色的HOR / HER性能。具体而言，IrMo _0.59表现出最高的催化活性，比Ir和商用Pt / C对HOR的催化活性高5倍，对HER的催化活性甚至高10倍。密度泛函理论（DFT）计算表明，IrMo表面H ₂ O占据的Mo位可有效优化* H ₂的自由能O和* OH，从而使IrMo在碱性HER / HOR电解中均遵循所谓的双功能机理。

更新日期：2020-07-02

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