Photoelectrochemical performance enhancement of ZnO photoanodes from ZnIn2S4 nanosheets coating
Photoelectrochemical performance enhancement of ZnO photoanodes from ZnIn2S4 nanosheets coating
复制标题
ZnIn2S4 纳米片涂层增强 ZnO 光阳极的光电化学性能
DOI：
10.1016/j.nanoen.2014.09.005
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发表时间：
2015-05-01
期刊：
影响因子：
17.6
通讯作者：
Zhang, Yue
中科院分区：
文献类型：
--
作者：
Bai, Zhiming;Yan, Xiaoqin;Zhang, Yue
开发具有高捕光效率和大电子传输能力的光阳极仍然是光电化学（PEC）水裂解的关键挑战。在本文中，我们报道了一种有效的方法，以提高光电转换性能的ZnO纳米线阵列（NAs）的光阳极通过包覆ZnIn 2S 4纳米片到ZnO表面。采用溶剂热法在还原的氧化石墨烯（RGO）衬底上制备了ZnIn 2S 4电催化剂纳米片，并将其接枝到ZnO NAs上，形成ZnO NAs/RGO/ZnIn 2S 4异质结。ZnIn 2S 4壳层作为可见光敏化剂，ZnIn 2S 4壳层和ZnO核之间的II型能带排列有助于电荷分离和传输。同时，RGO纳米片的引入大大增加了比表面积，通过降低界面电化学反应的能垒，加速了PEC过程。结果表明，ZnO NAs/RGO/ZnIn 2S 4异质结的光-氢转换效率比裸ZnO NAs提高了200%以上。结果表明，基于RGO的核/壳异质结阵列可以为太阳能水分解的潜在应用提供一个简单和兼容的配置。(C)2014爱思唯尔有限公司版权所有。
Developing photoanodes with high light-harvesting efficiency and great electronic transmission capacity remains a key challenge in photoelectrochemical (PEC) water splitting. In this paper, we reported an effective approach to enhance the PEC performance of ZnO nanowire arrays (NAs) photoanodes via overcoating ZnIn2S4 nanosheets onto the ZnO surfaces. The ZnIn2S4 electrocatalyst nanosheets were grown on the reduced graphene oxide (RGO) substrates by solvothermal synthesis and then grafted onto ZnO NAs, forming ZnO NAs/RGO/ZnIn2S4 heterojunctions. The ZnIn2S4 shells acted as visible light sensitizers, and the type-II band alignment between the ZnIn2S4 shells and the ZnO cores contributed to charge separation and transport. Meanwhile, the introduction of RGO nanosheets largely increased the surface area and accelerated the PEC process by reducing the energy barrier of interfacial electrochemical reaction. As a result, over 200% enhancement of photo-to-hydrogen conversion efficiency was achieved from the ZnO NAs/RGO/ZnIn2S4 heterojunctions compared to bare ZnO NAs. The results demonstrate that the RGO-based core/shell heterojunction arrays can provide a facile and compatible configuration for the potential applications in solar water splitting. (C) 2014 Elsevier Ltd. All rights reserved.