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A vanadium-containing high entropy alloy electrocatalyst with boosted electrocatalytic activity for oxygen evolution
Siru Chen1, Zhuo Wang1, Guoqun Liu1
1School of Material Electronics and Energy Storage, Zhongyuan University of Technology, Zhengzhou 450007, China.
None:
Electrocatalytic water splitting is an excellent option for green hydrogen preparation. However, the efficiency of water splitting is restricted by the sluggish reaction kinetics, especially for anodic oxygen evolution reaction (OER). High entropy alloys show good electrocatalytic activity for OER recently and the composition of high-entropy alloys can be easily adjusted to control their catalytic performance. In this work, we report a facile method to prepare a V-containing high entropy alloy catalyst using flower-like metal organic framework (MOF) as the precursor and investigated the role of V in OER. It is revealed that the introduction of V can regulate the electronic structure of ZnCoNiFeV-MOF-900 and induce the formation of high valent Ni centers, therefore reducing the reaction barrier for OER. Combined with the flower-like morphology that enables fast mass transport and exposure of adequate active sites, ZnCoNiFeV-MOF-900 exhibits a small overpotential of 284 mV at 10 mA cm-2 for OER. This work provides a new route for designing high entropy alloy electrocatalysts for energy conversion and storage.
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