P-Type Cu-Doped Zn0.3Cd0.7S/Graphene Photocathode for Efficient Water Splitting in a Photoelectrochemical Tandem Cell

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• 作者：Yijie Wu ; Zongkuan Yue ; Aijuan Liu ; Ping Yang ; Mingshan Zhu
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：May 2, 2016
• 年：2016
• 卷：4
• 期：5
• 页码：2569-2577
• 全文大小：620K
• 年卷期：0
• ISSN：2168-0485

文摘

By doping Cu(I) ions in Zn_0.3Cd_0.7S, a novel p-type Cu doped Zn_0.3Cd_0.7S modified graphene (Zn_0.3Cd_0.7S (Cu)/GR) film photocathode was prepared. The as-prepared p-type Zn_0.3Cd_0.7S (Cu)/GR photocathode and an n-type WO₃/graphene (WO₃/GR) photoanode were used to assemble a photoelectrochemical tandem cell. Through examination of the optoelectronic and photoelectrochemical properties of Zn_0.3Cd_0.7S (Cu)/GR and WO₃/GR photoelectrode, we evaluate the feasibility of the tandem cell for overall water splitting under UV–vis light irradiation. The optimal Cu doping in Zn_0.3Cd_0.7S photocathode concentration was found to be 6%. The rates of hydrogen and oxygen evolved from this tandem cell with the optimal electrodes were 65.6 and 12.3 μmol g^–1 h^–1 (80.5 and 15.1 μmol cm^–2 h^–1), respectively. This study suggests a promising method for constructing an efficient photoelectrochemical tandem device for overall water splitting.