Electroreduction of CO2 to CO over wide potential window by in situ electrodeposited CdCO3/Cd-CP electrocatalysts. Issue 43 (7th October 2022)

• Record Type: Journal Article
• Authors: Yang, Jie; Yang, Han; Zhang, Renjie; Zhou, Guangying; Li, Hongping; Yang, Dexin
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 43(2022)
• Page Start: 23028
• Page End: 23036
• Publication Date: 2022-10-07
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2ta06309c
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : The electrodeposited CdCO3 /Cd-CP- x electrocatalysts exhibited outstanding catalytic performance for CO2 electroreduction in both pure CO2 and low CO2 concentration. Abstract : The design of robust electrocatalysts for CO2 electroreduction with large current density and high selectivity for the desired production is a crucial step in realizing a carbon-neutral energy cycle and producing more valuable chemicals and fuels. Herein, the CdCO3 /Cd nanostructure was in situ electrodeposited on a carbon paper (CP) substrate to fabricate CdCO3 /Cd-CP- x (where x represents the concentration of Cd(NO3 )2 ·4H2 O) electrocatalysts that can boost the electrocatalytic performance of CO2 electroreduction. When CdCO3 /Cd-CP-2 was applied as an electrocatalyst, the faradaic efficiency (FE) of CO production remained above 90% over a wide potential window, and the current density reached up to 203 mA cm −2 at −2.4 V vs. Ag/Ag + . The enhanced CO2 electroreduction was mainly attributed to the intrinsic properties of the CdCO3 /Cd nanostructure with abundant active sites, the introduction of CdCO3, and tight contact with the CP substrate. Density functional theory calculations illustrated that the CdCO3 in the electrocatalyst promoted the formation of the *COOH intermediate, and the synergistic effect between the CdCO3 and the Cd support decreased the adsorption ability for the *CO intermediate, which improved the CO production rate. Furthermore, the CdCO3 /Cd-CP-8 electrocatalyst also exhibited highly selective CO production ability at low CO2 concentration with outstanding CO2 conversion rate (34%), which offers a chance to achieve the requirements of practical applications.