CO2 Synergistic Reduction in a Photoanode-Driven Photoelectrochemical Cell with a Pt-Modified TiO2 Nanotube Photoanode and a Pt Reduced Graphene Oxide Electrocathode

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• 作者：Meng Zhang ; Jun Cheng ; Xiaoxu Xuan ; Junhu Zhou ; Kefa Cen
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：December 5, 2016
• 年：2016
• 卷：4
• 期：12
• 页码：6344-6354
• 全文大小：809K
• ISSN：2168-0485

文摘

CO₂ synergistic reduction in a photoanode-driven photoelectrocatalytic (PEC) cell was conducted with a Pt-modified TiO₂ nanotube (Pt-TNT) photoanode and a Pt-modified reduced graphene oxide (Pt-RGO) electrocathode to reduce energy consumption and increase CO₂ PEC reduction efficiency. The carbon atom conversion rate of CO₂ reduction under PEC conditions was 2.3 times higher than that of the total rate under photocatalytic and electrocatalytic conditions. Synergistic CO₂ reduction in the PEC cell was mainly due to the use of the photoanode, which played a dual role during CO₂ reduction: (1) anode photovoltage compensated and conferred more negative cathode potential for CO₂ reduction and (2) anode water decomposition provided protons and electrons for cathode CO₂ reduction. System current density, product generation rate of CO₂ reduction, and carbon atom conversion rate increased first and then decreased with increasing deposition amount of Pt on TNT. The optimal photocatalytic activity of the Pt-TNT anode was obtained with a Pt loading amount of 5%, which resulted in the highest system current density of 4 mA/cm² and carbon atom conversion rate of 1250 nmol/(h cm²) under the catalysis of the Pt-RGO cathode.