用于增强光电催化性能的 ReS/NiS p-n 异质结构的原位集成。
In Situ Integration of ReS/NiS p-n Heterostructure for Enhanced Photoelectrocatalytic Performance.
机构信息
State Key Laboratory of Applied Organic Chemistry, Laboratory of Special Function Materials and Structure Design of the Ministry of Education, College of Chemistry and Chemical Engineering , Lanzhou University , Lanzhou 730000 , China.
出版信息
ACS Appl Mater Interfaces. 2019 Oct 30;11(43):40014-40021. doi: 10.1021/acsami.9b13891. Epub 2019 Oct 21.
The excellent light absorption, low electron-hole recombination rate, and fast reaction kinetics of photogenerated charges are urgently needed for photoelectrochemical (PEC) water splitting. Herein, a novel p-n heterostructure photoelectrode (ReS/NiS) is constructed via a one-step hydrothermal method, which shows remarkable HER activity under illumination such as a low overpotential (η) of 106 mV, high IPCE of 10-15%, and good stability. High-resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) reveal that the intimate interface and strong electron interaction between ReS and NiS can enhance the light adsorption and provide abundant active sites. The transient absorption (TA) spectroscopy and impedance spectroscopy analyses (EIS) demonstrate the prolonged carrier lifetime and fast charge transfer. All of these are responsible for the improvement of reaction kinetics. This work provides a brand new avenue to explore efficient photoelectrocatalysts for water splitting.
光电化学（PEC）水分解迫切需要光吸收优异、电子-空穴复合率低、光生电荷快速反应动力学的材料。在此，通过一步水热法构建了一种新型 p-n 异质结构光电电极（ReS/NiS），在光照下表现出显著的 HER 活性，如低过电位（η）为 106 mV、高光电流密度（IPCE）为 10-15%和良好的稳定性。高分辨率透射电子显微镜（HRTEM）和 X 射线光电子能谱（XPS）揭示了 ReS 和 NiS 之间的紧密界面和强电子相互作用可以增强光吸收并提供丰富的活性位点。瞬态吸收（TA）光谱和阻抗谱分析（EIS）表明载流子寿命延长，电荷转移加快。所有这些都有助于提高反应动力学。这项工作为探索用于水分解的高效光电催化剂提供了一条全新的途径。
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