Supporting trimetallic metal-organic frameworks on S/N-doped carbon macroporous fibers for highly efficient electrocatalytic oxygen evolution

• Main Authors: Zhao, Yafei, Lu, Xue Feng, Wu, Zhi-Peng, Pei, Zhihao, Luan, Deyan, Lou, Xiong Wen David
• Other Authors: School of Chemical and Biomedical Engineering
• Format: Article
• Language: English
• Published: 2023
• Subjects: Science::Chemistry; Cation-Exchange; Hollow S/N-Doped Carbon
• Online Access: https://hdl.handle.net/10356/166118
• Institution: Nanyang Technological University

Hybrid materials, integrating the merits of individual components, are ideal structures for efficient oxygen evolution reaction (OER). However, the rational construction of hybrid structures with decent physical/electrochemical properties is yet challenging. Herein, a promising OER electrocatalyst composed of trimetallic metal-organic frameworks supported over S/N-doped carbon macroporous fibers (S/N-CMF@FexCoyNi1-x-y-MOF) via a cation-exchange strategy is delicately fabricated. Benefiting from the trimetallic composition with improved intrinsic activity, hollow S/N-CMF matrix facilitating exposure of active sites, as well as their robust integration, the resultant S/N-CMF@FexCoyNi1-x-y-MOF electrocatalyst delivers outstanding activity and stability for alkaline OER. Specifically, it needs an overpotential of 296 mV to reach the benchmark current density of 10 mA cm−2 with a small Tafel slope of 53.5 mV dec−1. In combination with X-ray absorption fine structure spectroscopy and density functional theory calculations, the post-formed Fe/Co-doped γ-NiOOH during the OER operation is revealed to account for the high OER performance of S/N-CMF@FexCoyNi1-x-y-MOF.