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FeOx clusters decorated hcp Ni nanosheets as inverse electrocatalyst to stimulate excellent oxygen evolution performance

Wenxiu Yan,Yongli Shen,Chao An,Lina Li,Rui Si,Changhua An

Tuning the crystal phase of metals and constructing the metal-oxide interface provide a new way to improve oxygen evolution reaction (OER) kinetics. Herein, we developed a room-temperature plasma topology conversion of Fe 3+ doping Ni(OH) 2 nanosheets to porous hcp Ni engineered by FeOx clusters. X-ray absorption fine spectra established that they were formed via Ni-O-Fe bonds. The metal oxide-metal interfaces with benign geometry and electronic structures enable it to be applied as efficient electrocatalyst, exhibiting overpotential of 226 mV at 10 mA cm −2 . In situ Raman spectra show that the interfacial action of FeOx cluster with Ni can stimulate the generation of active intermediate of γ-NiOOH, effectively promoting OER rate. DFT calculation further demonstrates the interaction accelerates desorption of O 2 molecules on the surfaces. This work provides a simple and robust strategy to synthesize oxide clusters engineering metastable metal nanocatalysts, offering new platform to explore efficient catalysts in various fields.