In Situ Integration of ReS₂/Ni₃S₂ p-n Heterostructure for Enhanced Photoelectrocatalytic Performance

Abstract

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.

Distortion of the Coordination Structure and High Symmetry of the Crystal Structure in In4SnS8 Microflowers for Enhancing Visible-Light Photocatalytic CO2 Reduction

“…Compared with SnS 2 and In 2 S 3 , a higher photocurrent density of In 4 SnS 8 means that a large number of photogenerated electrons can be generated . At the same time, lower potential means that H + can be enriched on the surface of the catalyst Figure d further shows that the light conditions are beneficial to excite more electrons and drive the reduction of H + on the In 4 SnS 8 surface.…”

A new strategy: fermi level control to realize 3D pyramidal NiCo-LDH/ReS2/n-PSi as a high-performance photoanode for the oxygen evolution reaction

“…As we know, the band gaps of Si and ReS 2 are 1.12 eV and 1.51 eV, respectively. 23,31 And it is a typical Z-scheme band structure between Si and ReS 2 . Typically, holes came from the valence band (VB) of Si will recombine with electrons in the conduction band (CB) of ReS 2 to form a recombination center at the interface.…”

“…Layered rhenium disulfide (ReS 2 ), as one of the TMDs, has been paid high attention for PEC applications these days due to its suitable bandgap and weak interlayer coupling interactions. [22][23][24][25][26][27] A number of studies have reported the use of ReS 2 /p-Si heterostructures as photocathodes for the HER owing to the enhanced carrier separation and light absorption. [28][29][30] All these studies are based on the p-p junction at the ReS 2 /p-Si interface and near-surface downward band bending of p-type conductivity from ReS 2 nanosheets (NSs).…”

A comparative study of the effects of different TiO2 supports toward CO2 electrochemical reduction on CuO/TiO2 electrode

“…4 The electrical double layer capacitance is the most commonly used method to determine the electrochemically surface area (ECSA). [31][32][33] Fig. 5a-c shows the CV curves of the three electrodes near open circuit potential by different sweep speeds.…”