Metal-organic framework-derived cation regulation of metal sulfides for enhanced oxygen evolution activity
Wan, Kai (KU Leuven. Department of Materials Engineering)
Luo, Jiangshui (Sichuan University)
Liu, Wenbo (South China University of Technology)
Zhang, Ting (Institut Català de Nanociència i Nanotecnologia)
Arbiol i Cobos, Jordi (Institut Català de Nanociència i Nanotecnologia)
Zhang, Xuan (KU Leuven. Department of Materials Engineering)
Subramanian, Palaniappan (KU Leuven. Department of Materials Engineering)
Fu, Zhiyong (South China University of Technology)
Fransaer, Jan (KU Leuven. Department of Materials Engineering)

Fecha:	2023
Resumen:	Heteroatom doping serves as an important strategy to improve the oxygen evolution reaction (OER) activity of transition-metal compounds, while the investigation of intrinsic active sites and mechanisms remains insufficient. In this work, a facile cation regulation strategy is reported to boost the OER activity of metal sulfides via pyrolysis of the Ni-Co bimetallic metal-organic framework. The obtained Ni-substituted CoS nanoparticles on nitrogen-doped mesoporous carbon (Ni-CoS/NC) catalyst achieves a current density of 10 mA cm at a small overpotential of 270 mV with a Tafel slope of 37 mV dec in 1. 0 mol L KOH. Through a combination of spectroscopy study and theoretical computations, the activity origin is revealed at the atomic level. The CoNiOOH serves as the real active site for the OER generated by the Ni-CoS/NC reconstruction under oxidation potential during OER. The Ni substitution results in a strong electronic interaction between the two metals, thus generating more negatively charged Co atoms and more positively charged Ni atoms in the electrocatalyst. The metal sites with regulated electronic structure exhibit enhanced surface adsorption of OOH* and reduce the OER overpotential. Meanwhile, the conductive porous carbon scaffold facilitates electron transfer, mass diffusion, and the accessibility of active sites. This work not only provides a feasible cation regulation strategy for the design of high-performance electrocatalysts for low-cost energy storage and conversion systems, but also yields fresh insight into the activity enhancement mechanisms and intrinsic active sites.
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Lengua:	Anglès
Documento:	Article ; recerca ; Versió sotmesa a revisió
Materia:	Metal-organic framework ; Cation regulation ; Metal sulfide ; Metal oxyhydroxide ; Oxygen evolution reaction
Publicado en:	Chinese Journal of Catalysis, Vol. 54 (November 2023) , p. 290-297, ISSN 1872-2067

DOI: 10.1016/S1872-2067(23)64533-4

22 p, 1.1 MB

El registro aparece en las colecciones:
Documentos de investigación > Documentos de los grupos de investigación de la UAB > Centros y grupos de investigación (producción científica) > Ciencias > Institut Català de Nanociència i Nanotecnologia (ICN2)
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