Amorphous InOx nanoribbons for reinforced CO2 electroreduction at broad potential by enhancing CO2 adsorption and activation

Tuning surface electron transfer process by oxygen (O)‐vacancy engineering is an efficient strategy to develop enhanced catalysts for CO2 electroreduction (CO2ER). Herein, a series of O‐vacancy engineered InOx nanoribbons (NRs) have been created and adopted as efficient catalysts for CO2ER. Distinct InOx NRs with tunable O‐vacancy, namely, P‐InOx NRs, O‐InOx NRs and H‐InOx NRs, have been selectively created by simple thermal treatments, where the H‐InOx NRs rich in O‐vacancy show enhanced performance with the best formic acid (HCOOH) selectivity of up to 91.7% as well as high HCOOH partial current density over a wide range of potentials, largely outperforming those of the P‐InOx NRs and O‐InOx NRs with low O‐vacancy. The H‐InOx NRs also exhibit enhanced durability with limited activity decay after continuous operating for more than 20 h. The improved performance is attributable to the abundant O‐vacancy in the amorphous H‐InOx NRs, which optimizes CO2 adsorption/activation and facilitates electron transfer for efficient CO2ER.

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