蓝铜 CuS 纳米晶体的表面重构增强碱性溶液中的 OER 催化性能,Small

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蓝铜 CuS 纳米晶体的表面重构增强碱性溶液中的 OER 催化性能
Small ( IF 13.0 ) Pub Date : 2023-05-07 , DOI: 10.1002/smll.202301762
Jiamin Zhu ₁ , Shengjie Zi ₁ , Nan Zhang ₁ , Yang Hu ₁ , Li An ₁ , Pinxian Xi ₁

Affiliation

析氧反应（OER）是吐水装置、可充电金属空气电池等能量转换设备中重要的半反应之一。了解OER的反应机理并分析过渡金属硫化物的重构现象，有利于开发高效、低成本的催化剂。有趣的是，相同成分的硫化铜和硫化亚铜由于不同的金属离子价态和不同的原子排列方式而具有不同的重构行为。由于独特的原子排列顺序和一定的阳离子缺陷，CuS纳米材料的重构现象是S ²⁻首先被氧化为SO ₄²⁻，然后Cu ^x^{+通过Cu(OH)}₂转化为CuO 。此外，CuS特有的“改良沙漏结构”具有优异的导电性，更容易生成中间体。与Cu _{2 S相比，CuS表现出优异的OER活性，在10 mA cm}^-2下具有192 mV的较低过电势，并且在1.0 m KOH中120 h具有显着的电化学稳定性。_{在此，本研究阐明了CuS和Cu 2} S在OER过程中的重构模式，并揭示了CuS由于“改进的沙漏结构”而具有更强的CuS键和更快的电子传输效率，从而导致CuS的重构速度比CuS更快。铜₂ S。

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Surface Reconstruction of Covellite CuS Nanocrystals for Enhanced OER Catalytic Performance in Alkaline Solution

Oxygen evolution reaction (OER) is one of the important half-reactions in energy conversion equipment such as water-spitting devices, rechargeable metal-air batteries, and so on. It is beneficial to develop efficient and low-cost catalysts that understand the reaction mechanism of OER and analyze the reconstruction phenomenon of transition metal sulfide. Interestingly, copper sulfide and cuprous sulfide with the same components possess different reconstruction behaviors due to their different metal ion valence states and different atomic arrangement modes. Because of a unique atomic arrangement sequence and certain cationic defects, the reconstruction phenomenon of CuS nanomaterials are that S²⁻ is firstly oxidized to SO₄²⁻ and then Cu^x⁺ is converted into CuO via Cu(OH)₂. In addition, the specific “modified hourglass structure” of CuS with excellent conductivity is easier to produce intermediates. Compared with Cu₂S, CuS exhibits excellent OER activity with a lower overpotential of 192 mV at 10 mA cm⁻² and remarkable electrochemical stability in 1.0 m KOH for 120 h. Herein, this study elucidates the reconstruction modes of CuS and Cu₂S in the OER process and reveals that CuS has a stronger CuS bond and a faster electronic transmission efficiency due to “modified hourglass structure,” resulting in faster reconstruction of CuS than Cu₂S.

更新日期：2023-05-07

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