Oxygen Vacancies in Amorphous InOx Nanoribbons Enhance CO2 Adsorption and Activation for CO2 Electroreduction

Junbo Zhang¹, Rongguan Yin¹, Qi Shao¹, Ting Zhu², and Xiaoqing Huang^*，1（黄小青）

¹ College of Chemistry, Chemical Engineering and Materials Science Soochow University No.199, Ren’ai Road, Suzhou 215123, Jiangsu (China)

² Jiangxi Province Key Laboratory of Polymer Micro/Nano Manufacturing and Devices, East China University of Technology Jiangxi 330013, Nanchang (China)

Angew. Chem. Int. Ed. 2019, 58, 5609--5613

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 distinct InO_x NRs with different numbers of O‐vacancies, namely, pristine (P‐InO_x), low vacancy (O‐InO_x) and high‐vacancy (H‐InO_x) NRs, have been prepared by simple thermal treatments. The H‐InO_x NRs show enhanced performance with a 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‐InO_x and O‐InO_x NRs. The H‐InO_x NRs are more durable and have a limited activity decay after continuous operating for more than 20 h. The improved performance is attributable to the abundant O‐vacancies in the amorphous H‐InO_x NRs, which optimizes CO₂adsorption/activation and facilitates electron transfer for efficient CO₂ER.

链接：https://onlinelibrary.wiley.com/doi/full/10.1002/anie.201900167