Han Jianhua, Xing Haiyang, Song Qinggong, Yan Huiyu, Kang Jianhai, Guo Yanrui, Liu Zhifeng
College of Science, Civil Aviation University of China, Tianjin, 300300, China.
Dalton Trans. 2021 Apr 7;50(13):4593-4603. doi: 10.1039/d1dt00336d. Epub 2021 Mar 12.
In this study, we have designed and synthesized a novel ZnO@CuO core-shell heterojunction photoanode modified with cocatalyst ZnFe-layered double hydroxides (ZnFe-LDH). As expected, the deposition of CuO enhances light harvesting and shortens the diffusion distance for charge transfer. The ZnO@CuO heterojunction also enhances charge separation and suppresses recombination. Furthermore, modification with cocatalyst ZnFe-LDH facilitates photogenerated hole transport and accelerates the surface oxidation reaction kinetics. On account of the synergistic effect of the core-shell heterojunction in ZnO@CuO with cocatalyst ZnFe-LDH, this photoanode exhibits an optimal photocurrent density of 2.08 mA cm at 1.23 V vs. RHE, which is about 5.3 times that of the pristine ZnO photoanode. Therefore, the construction of ZnO@CuO core-shell nanorod arrays coupled with cocatalyst ZnFe-LDH provides an effective and novel route for designing low-cost and high-efficiency photoelectrodes.
在本研究中，我们设计并合成了一种新型的用助催化剂锌铁层状双氢氧化物（ZnFe-LDH）修饰的ZnO@CuO核壳异质结光阳极。正如预期的那样，CuO的沉积增强了光捕获并缩短了电荷转移的扩散距离。ZnO@CuO异质结还增强了电荷分离并抑制了复合。此外，用助催化剂ZnFe-LDH修饰促进了光生空穴传输并加速了表面氧化反应动力学。由于ZnO@CuO中的核壳异质结与助催化剂ZnFe-LDH的协同作用，该光阳极在相对于可逆氢电极（RHE）为1.23 V时表现出2.08 mA cm的最佳光电流密度，这约为原始ZnO光阳极的5.3倍。因此，构建与助催化剂ZnFe-LDH耦合的ZnO@CuO核壳纳米棒阵列提供了一种设计低成本和高效光电极的有效且新颖的途径。
