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In Situ Integration of ReS2/Ni3S2 p-n Heterostructure for Enhanced Photoelectrocatalytic Performance
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2019-10-21 , DOI: 10.1021/acsami.9b13891
Xiaoying Lu 1 , Ruitong Liu 1 , Qiang Wang 1 , Cailing Xu 1
Affiliation  

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 (ReS2/Ni3S2) is constructed via a one-step hydrothermal method, which shows remarkable HER activity under illumination such as a low overpotential (η10) 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 ReS2 and Ni3S2 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.

中文翻译:

ReS 2 / Ni 3 S 2 pn异质结构的原位集成以增强光电催化性能

光电化学(PEC)水分解迫切需要出色的光吸收,低的电子-空穴复合率以及光生电荷的快速反应动力学。在此,一种新型的pn异质结光电极(RES 2 /镍3小号2)通过一步法水热法,其示出了显着的照明下HER活性诸如低超电势(η构造10 106毫伏,10高IPCE)的–15%,并具有良好的稳定性。高分辨率透射电子显微镜(HRTEM)和X射线光电子能谱(XPS)显示ReS 2和Ni 3 S 2之间的紧密界面和强电子相互作用可以增强光的吸收并提供丰富的活性中心。瞬态吸收(TA)光谱和阻抗光谱分析(EIS)证明了延长的载流子寿命和快速的电荷转移。所有这些都有助于改善反应动力学。这项工作为探索高效的水分解用光电子催化剂提供了崭新的途径。
更新日期:2019-10-21
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