Nanoporous Au Thin Films on Si Photoelectrodes for Selective and Efficient Photoelectrochemical CO₂ Reduction

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• 作者：Jun Tae Song ; Hyewon Ryoo ; Minhyung Cho ; Jaehoon Kim ; Jin-Gyu Kim ; Sung-Yoon Chung and Jihun Oh
• 刊名：Advanced Energy Materials
• 出版年：2017
• 出版时间：February 8, 2017
• 年：2017
• 卷：7
• 期：3
• 全文大小：2016K
• ISSN：1614-6840

文摘

An Si photoelectrode with a nanoporous Au thin film for highly selective and efficient photoelectrochemical (PEC) CO₂ reduction reaction (CO₂RR) is presented. The nanoporous Au thin film is formed by electrochemical reduction of an anodized Au thin film. The electrochemical treatments of the Au thin film critically improve CO₂ reduction catalytic activity of Au catalysts and exhibit CO Faradaic efficiency of 96% at 480 mV of overpotential. To apply the electrochemical pretreatment of Au films for PEC CO₂RR, a new Si photoelectrode design with mesh-type co-catalysts independently wired at the front and the back of the photoelectrode is demonstrated. Due to the superior CO₂RR activity of the nanoporous Au mesh and high photovoltage from Si, the Si photoelectrode with the nanoporous Au thin film mesh shows conversion of CO₂ to CO with 91% Faradaic efficiency at positive potential than the CO₂/CO equilibrium potential.