Anode Photovoltage Compensation‐Enabled Synergistic CO2 Photoelectrocatalytic Reduction on a Flower‐Like Graphene‐Decorated Cu Foam Cathode. (23rd September 2020)

• Record Type: Journal Article
• Authors: Zhang, Meng; Xuan, Xiaoxu; Wang, Wenlong; Ma, Chunyuan; Lin, Zhiqun
• Is Part Of: Advanced functional materials. Volume 30:Number 52(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-09-23
• Subjects: 3D hierarchical electrodes -- anode‐photovoltage compensation -- CO2 reduction -- photoelectrocatalysis; Materials -- Periodicals; Chemical vapor deposition -- Periodicals; 620.11
• DOI: 10.1002/adfm.202005983
• Languages: English
• ISSNs: 1616-301X

Abstract

Abstract: An interconnected and hierarchically structured electrode composed of a Cu nanoparticle‐modified flower‐like reduced graphene oxide‐decorated copper foam (Cu NP/f‐RGO/CF) is crafted and exploited for photoelectrocatalytic (PEC) reduction of CO2 in a TiO2 nanotube photoanode‐driven PEC cell. Anode photovoltage compensation confers a more negative cathode potential for CO2 reduction, thus leading to a synergistic effect between photocatalysis (PC) and electrocatalysis (EC). CO2 reduction rate under PEC condition is 5.4× higher than that of the simple sum under PC and EC processes. The well‐defined flower structure of RGO in the CF scaffold effectively prevents its self‐agglomeration, which increases its adsorption towards CO2 with improved electron‐transfer kinetics due to the 3D interconnected structure with abundant electron transfer pathways. DFT calculations further reveal the absorption and activation of CO2 on Cu NP/f‐RGO capitalize on the CC bond with RGO and OCu bond with Cu NPs, thereby leading to a bended and stretched structure. The enhanced CO2 adsorptivity and activation on the hierarchical Cu NP/f‐RGO/CF electrode significantly improve CO2 reduction and facilitate the conversion of C1 products to high‐order products. This research highlights the great prospect of anode photovoltage compensation enables synergistic photoelectrocatalysis and 3D hierarchical electrode for CO2 drastic reduction into high‐order products. Abstract : Anode photovoltage compensation enables synergistic CO2 photoelectrocatalytic reduction in a Pt‐TiO2 nanotube photoanode‐driven photoelectrocatalytic cell. A hierarchical structured electrode composed of a Cu nanoparticle‐modified flower‐like reduced graphene oxide‐decorated copper foam enhanced CO2 absorptivity, leading to improved CO2 reduction and facilitated conversion of C1 products to high‐order products.