Shuttling Photoelectrochemical Electron Transport in Tricomponent CdS/rGO/TiO2 Nanocomposites

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• 作者：Haihua Yang ; Stephen V. Kershaw ; Yu Wang ; Xuezhong Gong ; Sergii Kalytchuk ; Andrey L. Rogach ; Wey Yang Teoh
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：October 10, 2013
• 年：2013
• 卷：117
• 期：40
• 页码：20406-20414
• 全文大小：529K
• 年卷期：v.117,no.40(October 10, 2013)
• ISSN：1932-7455

文摘

Composite photoelectrodes consisting of CdS sensitizer, reduced graphene oxide (rGO) transporter, and TiO₂ acceptor were synthesized in a solvothermal synthesis. Under solvothermal conditions, the dimethyl sulfoxide (DMSO) solvent medium decomposed to form free sulfides, which facilitated the formation of CdS and, at the same time, which also reduced graphene oxide sheets by forming disulfide moieties. Compared to pure CdS and TiO₂, coupling of these materials either as bi- or tricomponent composites (including rGO) allowed efficient interfacial charge separation and prolonged electron lifetimes. In particular, in the CdS/rGO/TiO₂ tricomposite case, the rGO plays vital roles in alleviating trapped electrons at the heterojunction and serves as a platform for shuttling electrons between CdS and TiO₂. Taking into account all of the structure-related charge-transport characteristics, including interfacial contacts, the highest quantum efficiency (incident photon-to-current efficiency, IPCE, at 460 nm = 12%) was achieved for the CdS/rGO/TiO₂ tricomposite, and this was 6-fold that of CdS/TiO₂.