Modulating the electronic configuration of Co species in MOF/MXene nanosheet derived Co-based mixed spinel oxides for an efficient oxygen evolution reaction†
ab
Dong-Sheng
Li
*ab
Abstract
The electronic configuration of Co cations at octahedral (Oct) sites plays a crucial role in the catalytic activity of Co3O4-based spinel oxides toward the oxygen evolution reaction (OER). However, there are few reports on modulating the electronic configuration of partial CoOct3+ (t62ge0g) to CoOct2+ (t62ge1g) for further promoting their OER performances. Herein, a metal–organic framework (MOF)/MXene composite material pyrolysis–reorganization strategy is developed to obtain heterogeneous Co-based mixed spinel oxides, Co3O4/Co2TiO4. By regulating the pyrolysis temperature, the mesoporous structures and the electronic configuration of CoOct cations of mixed spinel oxides can be simultaneously optimized, leading to exceptional OER performances with low overpotentials of 280 mV on a glassy carbon electrode and 260 mV on Ni foam at 10 mA cm−2 as well as good stability in alkaline solution. The synergistic catalytic effect between CoOct3+ in Co3O4 and CoOct2+ in Co2TiO4 is shown to be crucial for improving the OER activity. This finding will provide a new pathway for promoting the OER activity of Co-based spinel oxides.
- This article is part of the themed collection: 2023 Inorganic Chemistry Frontiers HOT articles
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