Heteroatom-Doped Amorphous Cobalt–Molybdenum Oxides as a Promising Catalyst for Robust Hydrogen Evolution,Inorganic Chemistry

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Heteroatom-Doped Amorphous Cobalt–Molybdenum Oxides as a Promising Catalyst for Robust Hydrogen Evolution
Inorganic Chemistry ( IF 4.3 ) Pub Date : 2022-03-11 , DOI: 10.1021/acs.inorgchem.1c03976
Minmin Wang _{1,

2} , Mengke Zhang ₁ , Wenwu Song ₁ , Li Zhou ₁ , Xunyue Wang ₁ , Yanfeng Tang ₁

Affiliation

The simultaneous manipulation of the catalytic activity and intrinsic electrical conductivity in a unified system is difficult yet meaningful to unravel the possible strategy that can enhance the hydrogen evolution reaction (HER) performance. Therefore, we propose a simple strategy to enhance the HER performance based on low-temperature redox reaction with ZIF-67@ZIF-8 as a sacrificial template to prepare zinc-doped amorphous CoMo₈O_x (denoted as Zn/aCMO). Benefiting from the excellent compositional- and amorphous-based structural advantages of more exposure active sites, optimized electron transfer as well as a stable frame structure, the as-prepared electrode can drive hydrogen evolution at current densities of 10, 50, and 100 mA cm^–2, which need ultralow overpotentials of 59, 138, and 189 mV, respectively, and the Tafel slope of the electrode was 66.2 mV dec^–1 (1 M KOH). Meanwhile, the intrinsic activity of the prepared low-cost electrocatalyst was also determined, and the turnover frequency was up to 1.49 s^–1 at an overpotential of 100 mV. In addition, after continuous testing for 160 h, there was a slight decay at the overpotential of 130 mV.

中文翻译：

杂原子掺杂的无定形钴-钼氧化物作为一种有前途的氢析出催化剂

在一个统一的系统中同时控制催化活性和本征电导率对于揭示可以提高析氢反应 (HER) 性能的可能策略是困难的，但也是有意义的。因此，我们提出了一种基于低温氧化还原反应的简单策略，以 ZIF-67@ZIF-8 作为牺牲模板制备锌掺杂的非晶 CoMo ₈ O _x（表示为 Zn/aCMO）。得益于更多的暴露活性位点、优化的电子转移以及稳定的框架结构等优异的成分和非晶结构优势，所制备的电极可以在 10、50 和 100 mA cm 的电流密度下驱动析氢^–2，分别需要 59、138 和 189 mV 的超低过电位，电极的 Tafel 斜率为 66.2 mV dec ^–1 (1 M KOH)。同时，还测定了制备的低成本电催化剂的内在活性，在过电位为 100 mV 时周转频率高达 1.49 s ^{-1 。}此外，连续测试160 h后，在130 mV的过电位处有轻微衰减。

更新日期：2022-03-11

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