Yang Suyi, Wang Baoyuan, Zhao Rui, Wei Liting, Su Jinzhan
International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, People's Republic of China.
Dalton Trans. 2023 Nov 14;52(44):16442-16450. doi: 10.1039/d3dt02698a.
Photoelectrochemical (PEC) water splitting for hydrogen production technology is considered as one of the most promising solutions to energy shortage and environmental remediation. TiO/NiS nanorod arrays were successfully prepared using hydrothermal deposition followed by the successive ionic layer adsorption and reaction (SILAR) method. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) and photoluminescence (PL) spectra characterization studies indicate the successful deposition of NiS on TiO NRs. The NiS deposition on TiO was optimized by controlling the impregnation cycle. The optimal sample exhibits a photocurrent density of 1.16 mA cm at 0.6 V Ag/AgCl, which is a 1.9-fold enhancement over that of pristine TiO nanorod arrays. The enhanced photoelectrochemical performance can be attributed to two aspects. On the one hand, the (101) crystal plane of rutile TiO is the facet where photogenerated holes accumulate and is an efficient active plane for the oxygen evolution reaction; on the other hand, NiS is a narrow band gap semiconductor, and its deposition on TiO nanorods can further promote the separation and transport of photogenerated charge carriers.
用于制氢的光电化学（PEC）水分解技术被认为是解决能源短缺和环境修复问题最有前景的解决方案之一。采用水热沉积法，随后通过连续离子层吸附和反应（SILAR）法成功制备了TiO/NiS纳米棒阵列。X射线衍射（XRD）、X射线光电子能谱（XPS）、扫描电子显微镜（SEM）和光致发光（PL）光谱表征研究表明NiS成功沉积在TiO纳米棒上。通过控制浸渍循环优化了NiS在TiO上的沉积。最佳样品在0.6 V Ag/AgCl下表现出1.16 mA cm的光电流密度，比原始TiO纳米棒阵列提高了1.9倍。光电化学性能的增强可归因于两个方面。一方面，金红石TiO的（101）晶面是光生空穴积累的晶面，是析氧反应的有效活性面；另一方面，NiS是一种窄带隙半导体，其沉积在TiO纳米棒上可进一步促进光生电荷载流子的分离和传输。
