Photoelectrochemical reduction of carbon dioxide at CuInS₂/graphene hybrid thin film electrode

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• 作者：Jiongliang Yuan^a ; ^{yuanjiongliang@163.com" class="auth_mail" title="E-mail the corresponding author} ; Peicheng Wang^a ; Cunjiang Hao^b ; Guoce Yu^c
• 关键词：CuInS2 ; graphene ; carbon dioxide ; methanol ; photoelectrochemical reduction
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：1 March 2016
• 年：2016
• 卷：193
• 期：Complete
• 页码：1-6
• 全文大小：1719 K

文摘

Converting CO₂ to methanol, a solar fuel, will not only reduce CO₂ emission, but also alleviate energy shortage. In this study, a photoelectrochemical reduction reaction of CO₂ to methanol is conducted using CuInS₂/graphene hybrid thin film as the photocathode. CuInS₂ and CuInS₂/graphene hybrid thin films are fabricated at 30 °C in dimethyl sulfoxide by one-step electrodeposition. The photocurrent densities of CuInS₂/graphene hybrid thin films are almost twice those of CuInS₂ thin films. Furthermore, the resulted CuInS₂/graphene hybrid thin film electrode exhibits better catalytic performance for photoelectrochemical reduction of CO₂ to methanol than the CuInS₂ thin film electrode. At the applied potential of −0.59 V, pyridine concentration of 10 mM, and pH of 5.2, higher methanol yield can be obtained at CuInS₂/graphene hybrid thin film electrode; and the rate of methanol formation at CuInS₂/graphene hybrid thin film electrode is about 1.4 times that at CuInS₂ thin film electrode.