Sn‐doped CeO₂Nanorods as High‐Performance Electrocatalysts for CO₂Reduction to Formate

Abstract

Electrochemical reduction of carbon dioxide to formate provides an effective way to solve the environmental problems caused by excessive carbon dioxide emissions and produce value-added products. Herein, we report the preparation of a Sn-doped CeO 2 catalyst, where oxygen vacancies are formed by thermal treatment in Ar/H 2 atmosphere, leading to enhanced carbon dioxide electroreduction to formate. The Faraday efficiency of formate production is found to reach 81.10 %, with a geometric current density of 9.13 mA cm À 2 at a potential of À 1.10 V versus reversible hydrogen electrode. Density functional theory calculations show that the incorporation of tin into CeO 2 promotes electron transport, lowers the energy barrier to form formate through HCOO*, and increases the selectivity of formate. Results from this study highlight the importance of metal-doping in CeO 2 towards the selective reduction of CO 2 to formate.

Enhanced electrocatalytic reduction of CO2to formateviadoping Ce in Bi2O3nanosheets

“…But some reports have proved that the activity of some ECR electrocatalysts can be effectively improved by combining with ceria through rational regulation. [41][42][43][44][45] Therefore, it is reasonable to expect that doping Ce in Bi-based oxide may improve the activity towards the ECR.…”

Boosting Electrochemical Reduction of CO2 to Formate over Oxygen Vacancy Stabilized Copper–Tin Dual Single Atoms Catalysts

“…The synthesis of the CeO 2 substrate refers to the previously reported literature. [ 35 ] Given the temperature‐dependence characteristics of generating oxygen vacancies in semiconductors, the optimal annealing conditions in CeO 2‐x is first determined using electron spin resonance (ESR) spectra, which yield a g value of 2.003 that is assigned to oxygen vacancy (Figure S1, Supporting Information). The signal intensity of oxygen vacancies is greatly increased with thermal treatment under Ar/H 2 flow, especially under 300 °C, which confirms the critical role of pyrolysis in inducing oxygen vacancies.…”

Favoring Product Desorption by a Tailored Electronic Environment of Oxygen Vacancies in SrTiO3 via Cr Doping for Enhanced and Selective Electrocatalytic CO2 to CO Conversion

“…The general mechanism for the ECO 2 RR to CO on the catalyst surfaces comprises three steps, viz., adsorption followed by activation, surface reaction, and product desorption. 44,78 Step 1: Adsorption and activation step:…”