Electrochemical CO2 to CO reduction at high current densities using a nanoporous gold catalyst. Issue 2 (1st February 2021)

• Record Type: Journal Article
• Authors: Qi, Zhen; Biener, Monika M.; Kashi, Ajay R.; Hunegnaw, Sara; Leung, Alvin; Ma, Sichao; Huo, Ziyang; Kuhl, Kendra P.; Biener, Juergen
• Is Part Of: Materials research letters. Volume 9:Issue 2(2021)
• Page Start: 99
• Page End: 104
• Publication Date: 2021-02-01
• Subjects: electrochemical CO2 reduction -- nanoporous gold -- dealloying -- electrocatalyst -- gas diffusion electrode; Materials science -- Research -- Periodicals; Biomedical materials -- Research -- Periodicals; Composite materials -- Research -- Periodicals; Biomedical materials -- Research; Composite materials -- Research; Materials science -- Research; Periodicals; 620.1105
• DOI: 10.1080/21663831.2020.1842534
• Languages: English
• ISSNs: 2166-3831

Abstract

Abstract : We report on integrating ultrathin monolithic nanoporous gold (npAu) catalyst coatings for CO2 reduction in a large electrode area (25 cm 2 ) electrochemical membrane reactor with gas diffusion electrodes at 100 mA/cm 2 . The CO Faraday efficiency increases with increasing thickness, from 65% to 75% and 80% for 1, 5, and 10 layers of npAu leaves where each npAu leaf layer is 100 nm thick. For the one npAu leaf layer configuration, this corresponds to an extremely high CO current density of 955 A/g gold thus demonstrating the potential for commercial applications. GRAPHICAL ABSTRACT: UF0001 IMPACT STATEMENT: By device level optimization of catalyst integration we significantly improved the utilization of gold catalysts for electrochemical CO2 reduction to syngas at industrial relevant current densities of 100 mA/cm 2 .