In Situ Growth of Matchlike ZnO/Au Plasmonic Heterostructure for Enhanced Photoelectrochemical Water Splitting
In Situ Growth of Matchlike ZnO/Au Plasmonic Heterostructure for Enhanced Photoelectrochemical Water Splitting
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原位生长类似 ZnO/Au 等离子体异质结构以增强光电化学水分解
DOI：
10.1021/am503044f
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发表时间：
2014-09-10
影响因子：
9.5
通讯作者：
Li, Shi-Kuo
中科院分区：
文献类型：
--
作者：
Wu, Mi;Chen, Wei-Jian;Li, Shi-Kuo
本文报道了一种具有等离子体增强光电化学(PEC)活性的新型匹配氧化锌/金(Au)异质结用于太阳能制氢。采用水热-光还原相结合的方法在锌衬底上原位生长了包覆在氧化锌纳米棒顶端的金纳米颗粒匹配异质结构。这种独特的异质结构表现出等离子体增强的光吸收、有效的电荷分离和金含量可调的输运性质。在外加电压为1.0V(vs Ag/AgCl2)、Au/Zn原子比为0.039的情况下，匹配状氧化锌/金异质结的光电流密度达到9.11 mA/cm2，远高于原始的氧化锌纳米棒阵列的光电流密度(0.33 mA/cm2)。此外，这种特殊异质结构的太阳能到氢的转换效率可以达到0.48%，是原始的氧化锌纳米棒阵列(0.03%)的16倍。此外，还可以通过优化异质结中的Au含量来进一步提高效率。提出了这种独特异质结构的形成机理，解释了等离子体增强的PEC性能。本研究将有助于可见光响应等离子体半导体/金属异质结构光阳极的合理设计，以获取太阳光谱。
In this paper, we report a novel matchlike zinc oxide (ZnO)/gold (Au) heterostructure with plasmonic-enhanced photoelectrochemical (PEC) activity for solar hydrogen production. The matchlike heterostructure with Au nanoparticles coated on the tip of ZnO nanorods is in situ grown on a zinc (Zn) substrate by using a facile hydrothermal and photoreduction combined approach. This unique heterostructure exhibits plasmonic-enhanced light absorption, efficient charge separation and transportation properties with tunable Au contents. The photocurrent density of the matchlike ZnO/Au heterostructure reaches 9.11 mA/cm(2) at an applied potential of 1.0 V (vs Ag/AgCl) with an Au/Zn atomic ratio of 0.039, which is much higher than that of the pristine ZnO nanorod array (0.33 mA/cm2). Moreover, the solar-to-hydrogen conversion efficiency of this special heterostructure can reach 0.48%, 16 times higher than that of the pristine ZnO nanorod array (0.03%). What is more, the efficiency could be further improved by optimizing the Au content of the heterostructure. The formation mechanism of such a unique heterostructure is proposed to explain the plasmonic-enhanced PEC performance. This study might contribute to the rational design of the visible-light-responsive plasmonic semiconductor/metal heterostructure photoanode to harvest the solar spectrum.