Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 11, Issue 47, Pages 44179-44185Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.9b14713
Keywords
2D materials; Photoelectrochemical water splitting; Chemical vapor deposition; NbS2; Si Nanowires; Solar HER
Funding
- Department of Science and Technology (DST), Govt. of India under the scheme of FIST [SR/NM/NS-1502/2014]
- Department of Science and Technology (DST), Govt. of India under Nanomission [SR/NM/NS-1502/2014]
- DST-INSPIRE, Govt. of India (DST INSPIRE-JRF IF) [170198 DST/INSPIRE Fellowship/2016]
Ask authors/readers for more resources
In recent days, 2-dimensional (2D) niobium disulfide (NbS2) with near-zero Gibbs free energy and superlative acid electrolyte stability has provoked a great deal of interest toward hydrogen evolution reaction (HER) electrocatalyst due to its active basal and edge sulfur sites. Herein, we developed a single step method for the direct deposition of 2D-NbS2 on highaspect-ratio topographies of silicon nanowires (NWs) by chemical vapor deposition for the applications in HER electrocatalyst. The resultant 2D-NbS2 electrocatalyst demonstrates the HER overpotential of 74 mV vs RHE (reversible hydrogen electrode) @ 1 mA/cm2 under acidic conditions and stable for more than 20 h. More importantly, we developed the Si NWs array based photoelectrochemical water-splitting system with the direct deposition of 2D-NbS2 as HER catalyst. The resultant 2D-NbS2-Si NWs photocathode system demonstrates improved charge transfer characteristics at the Si-NbS2 interfaces that leads to an enhanced turn on potential (from 0.06 to 0.34 V vs RHE) with the current density of 28 mA/cm2 at the 0 V vs RHE. The results evidence the synergistic effect of 2D-NbS2 electrocatalysts that addresses poor surface kinetics of Si toward solar water electrolysis. Our comprehensive studies reveal NbS2 as a new class of photoelectrochemical cocatalyst for efficient solar HER performance by promoting the charge transfer process with prolonged acid stability.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available