Enhanced Photoelectrochemical Performance of Cuprous Oxide/Graphene Nanohybrids.
Enhanced Photoelectrochemical Performance of Cuprous Oxide/Graphene Nanohybrids.
复制标题
DOI：
10.1021/jacs.7b01820
复制
发表时间：
2017-05-17
影响因子：
15
通讯作者：
Janáky C
中科院分区：
文献类型：
--
作者：
Kecsenovity E;Endrődi B;Tóth PS;Zou Y;Dryfe RAW;Rajeshwar K;Janáky C
氧化物半导体与高导电纳米碳框架（例如石墨烯或碳纳米管）的组合是组装用于太阳能燃料产生的高效光电极的有吸引力的途径。为了充分利用可能的协同作用的混合形成，然而，这些系统的精确知识是必需的，以允许合理的设计和形态工程。本文介绍了纳米晶p-Cu 2 O在不同石墨烯基底表面的受控电化学沉积。开发的合成协议允许调整的形态特征的杂交推断从电子显微镜。（光）电化学测量（包括光伏安法、电化学阻抗谱、光电流瞬态分析）表明，与裸Cu 2 O膜相比，含有2D石墨烯的光电极具有更好的性能，增强的性能源于抑制的电荷载流子复合。为了阐明石墨烯的确切作用，用碳纳米管（CNT）膜和3D石墨烯泡沫进行了比较研究。这些研究表明，在考虑到表面积增加的影响后，3D石墨烯基底的性能优于其他两种纳米碳。它的互连结构促进了有效的电荷分离和传输，从而更好地收集所产生的光电子。这些混合组件被证明是潜在的有吸引力的候选人在光电化学能量转换方案，即CO2还原。
Combination of an oxide semiconductor with a highly conductive nanocarbon framework (such as graphene or carbon nanotubes) is an attractive avenue to assemble efficient photoelectrodes for solar fuel generation. To fully exploit the possible synergies of the hybrid formation, however, precise knowledge of these systems is required to allow rational design and morphological engineering. In this paper, we present the controlled electrochemical deposition of nanocrystalline p-Cu2O on the surface of different graphene substrates. The developed synthetic protocol allowed tuning of the morphological features of the hybrids as deduced from electron microscopy. (Photo)electrochemical measurements (including photovoltammetry, electrochemical impedance spectroscopy, photocurrent transient analysis) demonstrated better performance for the 2D graphene containing photoelectrodes, compared to the bare Cu2O films, the enhanced performance being rooted in suppressed charge carrier recombination. To elucidate the precise role of graphene, comparative studies were performed with carbon nanotube (CNT) films and 3D graphene foams. These studies revealed, after allowing for the effect of increased surface area, that the 3D graphene substrate outperformed the other two nanocarbons. Its interconnected structure facilitated effective charge separation and transport, leading to better harvesting of the generated photoelectrons. These hybrid assemblies are shown to be potentially attractive candidates in photoelectrochemical energy conversion schemes, namely CO2 reduction.