Abstract
Developing oxygen evolution reaction (OER) electrocatalysts is essential to accomplish viable CO2 and water electrolysis. Herein, we report the fabrication and OER performance of Ni-foam (NF)-immobilized Ni6 nanoclusters (NCs) (Ni6/NF) prepared by a dip-coating process. The Ni6/NF electrode exhibited a high current density of 500 mA/cm<sup>2</sup> for the OER at an overpotential as low as 0.39 V. Ni6/NF exhibited high durability in an alkaline solution without corrosion. Electrokinetic studies revealed that OER can be easily initiated on Ni6 NC with fast electron-transfer rates. Finally, we demonstrated stable CO2-to-CO electroreduction using an NC-based zero-gap CO2 electrolyzer operated at a current density of 100 mA/cm<sup>2</sup> and a full-cell potential of 2.0 V for 12 h.
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