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Facet Engineering and Pore Design Boost Dynamic Fe Exchange in Oxygen Evolution Catalysis to Break the Activity-Stability Trade-Off.
Wang, Yong; Zhao, Yongzhi; Liu, Luan; Qin, Wanjun; Liu, Sijia; Tu, Juping; Liu, Yadong; Qin, Yunpu; Liu, Jianfang; Wu, Haoyang; Zhang, Deyin; Chu, Aimin; Jia, Baorui; Qu, Xuanhui; Qin, Mingli; Xue, Junmin.
Afiliación
  • Wang Y; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Zhao Y; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Liu L; Department of Materials Science and Engineering, National University of Singapore, 117575, Singapore.
  • Qin W; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Liu S; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Tu J; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Liu Y; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Qin Y; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Liu J; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Wu H; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Zhang D; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Chu A; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Jia B; School of Materials Science and Engineering, Hunan University of Science and Technology, Xiangtan 411201, China.
  • Qu X; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Qin M; Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China.
  • Xue J; Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China.
J Am Chem Soc ; 145(37): 20261-20272, 2023 Sep 20.
Article en En | MEDLINE | ID: mdl-37452768
ABSTRACT
The oxygen evolution reaction (OER) plays a vital role in renewable energy technologies, including in fuel cells, metal-air batteries, and water splitting; however, the currently available catalysts still suffer from unsatisfactory performance due to the sluggish OER kinetics. Herein, we developed a new catalyst with high efficiency in which the dynamic exchange mechanism of active Fe sites in the OER was regulated by crystal plane engineering and pore structure design. High-density nanoholes were created on cobalt hydroxide as the catalyst host, and then Fe species were filled inside the nanoholes. During the OER, the dynamic Fe was selectively and strongly adsorbed by the (101̅0) sites on the nanohole walls rather than the (0001) basal plane, and at the same time the space-confining effect of the nanohole slowed down the Fe diffusion from catalyst to electrolyte. As a result, a local high-flux Fe dynamic equilibrium inside the nanoholes for OER was achieved, as demonstrated by the Fe57 isotope labeled mass spectrometry, thereby delivering a high OER activity. The catalyst showed a remarkably low overpotential of 228 mV at a current density of 10 mA cm-2, which is among the best cobalt-based catalysts reported so far. This special protection strategy for Fe also greatly improved the catalytic stability, reducing the Fe leaching amount by 2 orders of magnitude compared with the pure Fe hydroxide catalyst and thus delivering a long-term stability of 130 h. An assembled Zn-air battery was stably cycled for 170 h with a low discharge/charge voltage difference of 0.72 V.

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: J Am Chem Soc Año: 2023 Tipo del documento: Article País de afiliación: China

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: J Am Chem Soc Año: 2023 Tipo del documento: Article País de afiliación: China