A modulated electronic state strategy designed to integrate active HER and OER components as hybrid heterostructures for efficient overall water splitting

By Yali Liu, Xiaohu Luo, Chengliang Zhou, Shuo Du, Deshuai Zhen, Bo Chen, Ji Li, Qian Wu, Yorhyikazcu Iru, Dongchu Chen. 2020

204 citations recorded by the source corpus.

Abstract Herein, we report a rational design of one-dimension (1D) porous hybrid heterostructures with the active HER (Mo2C) and OER (Co4S3) embedded N and S co-doped carbon (Co4S3/Mo2 C-N SC) for the effective overall water splitting. Spectroscopic characterizations reveals that modulated electronic state behaviors are generated by the strong chemical couplings at the nanointerface which triggers the charge from Co2+ to Mo4+/Mo6+ through the interfacial Mo-S-Co bond, resulting in producing the considerable amounts of the active sites (i.e., Co3+, Mo2+, and Mo3+) for the HER and OER in the hybrid heterostructures. Interestingly, Co4S3/Mo2 C-N SC shows pronounced synergistic effects in electrocatalytic activity for the HER and OER. When Co4S3/Mo2 C-N SC is used as both anode and cathode for overall water splitting, a low cell voltage of 1.62 eV is generated at 10 mA cm−2. The interesting work highlights the significance of optimization electronic structure based on transition metal-based bifunctional electrocatalysts for the HER and OER.

Subfields: Electrical and Electronic Engineering, Renewable Energy, Sustainability and the Environment

View Paper: https://www.semanticscholar.org/paper/355233789b9fd43dd7ac78c4b794cd53df4aa572