Design and roles of RGO-wrapping in charge transfer and surface passivation in photoelectrochemical enhancement of cascade-band photoanode

作     者：Zhuo Zhang Mingi Choi Minki Baek Insung Hwang Changshin Cho Zexiang Deng Jinwoo Lee Kijung Yong 

作者机构：Surface Chemistry Laboratory of Electronic Materials Department of Chemical Engineering POSTECH Pohang 790-784 Republic of Korea Advanced Functional Nanomaterial Laboratory Department of Chemical Engineering POSTECH Pohang 790-784 Repubfic of Korea State Key Laboratory of Optoelectronic Materials and Technologies School of Physics and Engineering Sun Yat-Sen University Guangzhou 510275 China 

基　　金：supported by the National Research Foundation of Korea 

出 版 物：《Nano Research》 (纳米研究（英文版）)

年 卷 期：2017年第10卷第7期

页      码：2415-2430页

摘      要：Fast charge transfer and anti-photocorrosion are two crucial factors for developing efficient, durable photoanodes for photoelectrochemical （PEC） cells. Reduced graphene oxide （RGO） is a promising photoanode element that can provide both of these. In this study, we elucidated the roles of RGO in the charge transfer and surface passivation of photoanodes by the precise design of a RGO-wrapped photoanode and examination of its PEC properties. Arrays of hetero-nanorods （HNRs） with three different designs were fabricated as photoanodes using RGO, CdSe nanoparticles （NPs）, and ZnO nanorods （NRs） as building blocks. CdSe@ZnO HNRs were prepared by decorating ZnO NRs with CdSe NPs. Finite-element analysis and experimental studies demonstrated that in the CdSe@ZnO HNRs, if only the ZnO NRs were wrapped by RGO, the conductivity between CdSe and ZnO was enhanced by RGO to shuttle charges. If RGO only surrounded the outside of the CdSe@ZnO HNRs, the corrosion was slowed owing to the passivation effect of RGO, which increased the electron lifetime of the photoanode. If both CdSe and ZnO were fully wrapped by RGO, the advantages of the two aforementioned cases were both obtained. RGO-wrapped CdSe@ZnO HNRs with position-controlled designs are promising photoanode materials with a high PEC efficiency, and the developed synthesis process can be applied to explore the design and fabrication of next-generation photoanodes using RGO as a buildin~ block.

主 题 词：photoelectrochemical reduced graphene oxide(RGO) charge transfer surface passivation CdSe ZnO 

学科分类：081704[081704] 07[理学] 070304[070304] 08[工学] 0817[工学-轻工类] 0703[理学-化学类] 081202[081202] 0812[工学-测绘类] 

核心收录：

D　O　I：10.1007/s12274-017-1443-4

馆 藏 号：203255329...