Zhang Yuzhi, Zhang Yunlong, Guo Yunfeng, Wu Lingnan, Liu Yangqiao, Song Lixing
Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Sciences 1295 Dingxi Road Shanghai 200050 China
Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences Beijing 100049 China.
RSC Adv. 2019 Jan 21;9(5):2666-2672. doi: 10.1039/c8ra09028a. eCollection 2019 Jan 18.
AuPd nanoparticle-decorated graphene-coated ZnO nanorod (ZNR) array electrodes (ZNR@Gr/AuPd) were synthesized electrostatic self-assembly followed by solution reduction methods. The morphologies of ZNR@Gr/AuPd were characterized with scanning electron microscopy (SEM), transmission electron microscopy (TEM), and atomic force microscopy (AFM), which indicated that ZNR was well-coated by graphene with 3-5 layers and uniformly decorated with AuPd nanoparticles (about 5 nm). UV-Vis diffuse reflectance and photoluminescence spectra were obtained to analyze the optical properties. The photoelectrochemical (PEC) properties were also evaluated; the results indicated that the photocurrent density was 2.27 mA cm at 0.8 V Ag/AgCl, which was 7.1 times that of bare ZNR. The sample also displayed enhanced PEC stability (91.3%), which prevented photocorrosion. Finally, a proposed PEC mechanism of ZNR@Gr/AuPd was illustrated to explain the charge transfer and the role of graphene and AuPd nanoparticles in the improvement of PEC performance and stability. The ZNR@Gr/AuPd electrode shows excellent PEC performance and stability, exhibiting promising potential in the generation of H.
通过静电自组装结合溶液还原法合成了金钯纳米颗粒修饰的石墨烯包覆氧化锌纳米棒（ZNR）阵列电极（ZNR@Gr/AuPd）。采用扫描电子显微镜（SEM）、透射电子显微镜（TEM）和原子力显微镜（AFM）对ZNR@Gr/AuPd的形貌进行了表征，结果表明ZNR被3 - 5层石墨烯良好包覆，并均匀地装饰有金钯纳米颗粒（约5纳米）。获得了紫外 - 可见漫反射光谱和光致发光光谱以分析光学性质。还评估了光电化学（PEC）性质；结果表明，在0.8 V（相对于Ag/AgCl）时光电流密度为2.27 mA/cm²，是裸ZNR的7.1倍。该样品还表现出增强的PEC稳定性（91.3%），可防止光腐蚀。最后，阐述了ZNR@Gr/AuPd的PEC机理，以解释电荷转移以及石墨烯和金钯纳米颗粒在改善PEC性能和稳定性方面的作用。ZNR@Gr/AuPd电极表现出优异的PEC性能和稳定性，在产氢方面展现出广阔的应用前景。
