CO2 Reduction on Cu at Low Overpotentials with Surface-Enhanced in Situ Spectroscopy
journal contributionposted on 20.07.2016, 00:00 by Jeffrey Heyes, Marco Dunwell, Bingjun Xu
In situ surface-enhanced spectroscopic and reactivity investigations of the electrochemical reduction of CO2 at low overpotentials (<0.7 V) was conducted on Cu surfaces. Vibrational bands corresponding to adsorbed hydrogen (Had) and carbon monoxide (COad) on Cu have been identified at 2090 and 2060 cm–1, respectively. Spectroscopic investigations show that Had is capable of partially displacing COad; however, COad is unable to displace Had to any detectable level. The preferential adsorption of H over CO on Cu is consistent with the high selectivity toward the hydrogen evolution reaction at potentials >−0.8 V versus reversible hydrogen electrode.