Reconstructing cobalt disulfide nanosheets through sulfur doping hexamethylenetetramine regulated β-Co(OH)2 for oxygen evolution reaction

IF 4.3 3区工程技术 Q2 ENGINEERING, CHEMICAL

Frontiers of Chemical Science and Engineering Pub Date : 2025-01-10 DOI:10.1007/s11705-025-2525-6

Xiangtai Zhang, Lei Wu

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Abstract

Exploiting advanced transition metal based electrocatalysts is critical for the oxygen evolution reaction (OER) due to their high efficiency in an alkaline environment for water splitting. Herein, CoS₂ nanosheets were synthesized through simple hydrothermal process and sulfurized layered β-Co(OH)₂ nanosheets as a precursor. The regulation strategy of hexamethylenetetramine was employed to create layered single-crystal β-Co(OH)₂ nanosheets. X-ray absorption fine structure indicates the crystal phase reconstructions occur on β-Co(OH)₂ surface during the sulfidation reaction. The sulfurized β-Co(OH)₂ nanosheets present an overpotential of only 297 mV to reach 10 mA·cm⁻², a low Tafel slope of 71.7 mV·dec⁻¹ and excellent stability for OER. The results clarified that the CoS₂ nanosheets excellent OER performance is attributable to cobalt sulfide sheet structure and structural changes by sulfur dopants. The results of the sulfurized layered β-Co(OH)₂ to produce CoS₂ nanosheets indicate that this strategy may represents a potential replacement for oxygen evolution application, particularly for the large-scale production of water splitting catalysts.

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先进的过渡金属基电催化剂在碱性环境中具有很高的水分离效率，因此，开发这种催化剂对于氧进化反应（OER）至关重要。本文以硫化层状β-Co(OH)2纳米片为前驱体，通过简单的水热法合成了CoS2纳米片。采用六亚甲基四胺的调节策略生成了层状单晶 β-Co(OH)2 纳米片。X 射线吸收精细结构表明，在硫化反应过程中，β-Co(OH)2 表面发生了晶相重构。硫化后的β-Co(OH)2 纳米片在达到 10 mA-cm-2 时的过电位仅为 297 mV，Tafel 斜率低至 71.7 mV-dec-1，并且对 OER 具有极好的稳定性。研究结果表明，CoS2 纳米片优异的 OER 性能得益于硫化钴片结构以及掺硫剂对结构的改变。硫化层状 β-Co（OH）2制备 CoS2 纳米片的结果表明，这种策略有可能替代氧进化应用，特别是大规模生产水分离催化剂。

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来源期刊

Frontiers of Chemical Science and Engineering ENGINEERING, CHEMICAL-

CiteScore

7.60

自引率

6.70%

发文量

868

审稿时长

1 months

期刊介绍： Frontiers of Chemical Science and Engineering presents the latest developments in chemical science and engineering, emphasizing emerging and multidisciplinary fields and international trends in research and development. The journal promotes communication and exchange between scientists all over the world. The contents include original reviews, research papers and short communications. Coverage includes catalysis and reaction engineering, clean energy, functional material, nanotechnology and nanoscience, biomaterials and biotechnology, particle technology and multiphase processing, separation science and technology, sustainable technologies and green processing.