ZnO/Pt光阳极的水热法一步合成及其光电化学性能-中国材料进展

文章信息/Info

Title:: One-Step Hydrothermal Synthesis and Photoelectrochemical Properties of ZnO/Pt Photoanodes

Author(s):: WANG Xiaolei; QIU Zhiyong; Key Laboratory of Materials Modification by Laser, Ion and Electron Beams,Ministry of Education, School of Materials Science and Engineering,Dalian University of Technology, Dalian 116000, China

Keywords:: one-step hydrothermal method; zinc oxide; platinum; photoelectrochemical; water splitting

摘要:: 展示了一种非传统的水热方法，由金属薄膜与超纯水的一步水热法合成制备ZnO薄膜负载Pt纳米粒子的光阳极催化剂。通过改变初始金属薄膜的成分，可以调节光阳极中Pt纳米粒子的负载量，并通过对光电化学催化水分解效率的测量，系统探讨Pt负载量对光阳极催化剂光电化学性能的影响。由于该水热法所生成的光阳极催化剂具有独特微纳结构，因此该ZnO/Pt复合光阳极即使在催化剂质量为微克级时仍表现出高的催化活性，并且随着Pt纳米粒子负载量的增加，其水分解性能得到提高。当Pt纳米粒子的物质的量分数为5.6%时，ZnO/Pt复合光阳极光电流密度达到最大值，约为纯ZnO光阳极光电流密度的1.3倍。不仅制备出一种高催化活性的复合光电催化剂，而且为氧化物半导体贵金属复合催化剂的制备提供了一种简单、绿色的新方法。

Abstract:: This study presents a non-traditional hydrothermal method for synthesizing a zinc oxide film-supported platinum nanoparticle photocatalyst in a one-step reaction between a metal film and ultrapure water. By changing the composition of the initial metal film, the loading amount of platinum nanoparticles in the photocatalyst was modulated, and the effect of the platinum loading amount on its photoelectrochemical performance was systematically discussed through the measurement of the catalytic efficiency for water splitting. The unique micro/nanostructure generated by this hydrothermal method enabled the ZnO/Pt composite photocatalyst in this study to exhibit high catalytic activity, even at microgram levels. Its water-splitting performance was enhanced with an increasing platinum nanoparticle loading amount. The photocurrent density reached a maximum of about 1.3 times the pure zinc oxide water splitting efficiency when the amount of substance fraction of platinum nanoparticles was 5.6%. This study prepared a high active composite photoelectrochemical catalyst and provided a simple and environmentally friendly method for preparing oxide semiconductor noble metal composite catalysts.