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Charge-Transfer-Promoted High Oxygen Evolution Activity of [email protected]9S8 Core–Shell Nanochains
- Xiaotao YuanXiaotao YuanBeijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Xiaotao Yuan,
- Junwen Yin ,
- Zichao LiuZichao LiuBeijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Zichao Liu,
- Xin WangXin WangBeijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Xin Wang,
- Chenlong DongChenlong DongBeijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Chenlong Dong,
- Wujie DongWujie DongBeijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Wujie Dong,
- Muhammad Sohail RiazMuhammad Sohail RiazBeijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Muhammad Sohail Riaz,
- Zhe ZhangZhe ZhangBeijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaMore by Zhe Zhang,
- Ming-Yang Chen*Ming-Yang Chen*E-mail: [email protected] (M.-Y.C.).Beijing Computational Science Research Center, Beijing 100084, ChinaMore by Ming-Yang Chen, and
- Fuqiang Huang*Fuqiang Huang*E-mail: [email protected] (F.H.).Beijing National Laboratory for Molecular Sciences and State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. ChinaState Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. ChinaMore by Fuqiang Huang
Abstract
[email protected]9S8 nanochains with core–shell structures are prepared by a direct-current arc-discharge technique and followed sulfurization at 200 °C. The nanochains, which consist of uniform nanospheres connecting each other, can range up to several micrometers. The thickness of Co9S8 shell can be changed by regulating the sulfurization time. In this heterostructure of [email protected]9S8, Co nanochains function as a conductive network and can inject electrons into Co9S8, which manipulates the work function of Co9S8 and makes it more apposite for catalysis. The density functional theory calculation also reveals that coupling with Co can significantly reduce the overpotential needed to drive the oxygen evolution process. On the basis of the exclusive structure, [email protected]9S8 nanochains have shown high catalytic activity in the oxygen evolution reaction. [email protected]9S8 reaches an overpotential of 285 mv at 10 mA cm–2, which is much lower than that of Co nanochains (408 mV) and Co9S8 (418 mV). [email protected]9S8 also shows higher catalytic activity and robustness compared to state-of-the-art noble-metal catalyst RuO2.
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