Journal
CHEMICAL ENGINEERING JOURNAL
Volume 408, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.127319
Keywords
MOFs; Oxygen evolution reaction; DFT; Adsorption of *OH; In situ cathodic electro-transformation
Categories
Funding
- National Natural Science Foundation of China [21972107, 21633008]
- National Natural Science Foundation of Hubei Province [2020CFA095]
- National Natural Science Foundation of Jiangsu Province [BK20191186]
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This study introduces a universal strategy to improve the performance and stability of oxygen evolution reaction by generating a layer of Co(OH)(2) coating on the surface of metal-organic frameworks. Experimental analysis and computational simulations demonstrate the importance of electron transfer in modulating the adsorption free energy in OER pathways.
Although metal-organic frameworks (MOFs) with coordinatively unsaturated metal centers have been regarded as promising electrocatalysts towards oxygen evolution reaction (OER), few reports focus on MOFs with inactive coordinative-saturated metal centers. Herein, we report a universal strategy to generate a layer of Co(OH)(2) coating on the surface of Co-MOFs (Co(OH)(2)/Co-MOF) through an in situ cathodic electro- transformation approach. Experimental analysis and density functional theory (DFT) calculations reveal that electrons transfer from Co(OH)(2) to Co-MOF could synergistically tailor the adsorption free energy of oxygenic intermediates in the OER pathways, which together with the unique structure of Co-MOF, contribute to the outstanding OER performance and long-term stability, with overpotential of 196 mV to achieve the current density of 10 mA cm(-2).
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