The Dual Active Sites Reconstruction on Gelatin In-Situ Derived 3d Porous N-Doped Carbon for Efficient and Stable Water Splitting

32 Pages Posted: 8 Dec 2023

See all articles by Ying Wei

Ying Wei

Shanghai Institute of Technology

Xiaomin Chen

Shanghai Institute of Technology

Chang Xi

Shanghai Institute of Technology

Shaobo Zhou

Shanghai Institute of Technology

Sheng Han

Shanghai Institute of Technology - School of Chemical and Environmental Engineering

Jibo Jiang

Shanghai Institute of Technology

Abstract

The exploration of bifunctional electrocatalysts with high activity, stability, and economy is of great significance in promoting the development of water splitting. Herein, a dual active sites NiCoS/NC heterostructure was designed to be derived in situ on 3D N-doped porous carbon (NC) using gelatin as a nitrogen and carbon source. The characterization of experiments suggests that nanoflower-like Ni2CoS4 (abbreviated as NiCoS) was randomly distributed on the NC substrate, and the sheet-like NC formed a highly open porous network structure resembling a honeycomb, which provided more accessible active sites for electrolyte ions. In addition, the special crystal-amorphous nanostructures of the catalyst materials help to promote the surface reconstruction to the real active substance Ni(Co)OOH, and the double active sites synergistically reduce the overpotential of OER and improve its kinetics. DFT (Density-functional theory) calculations reveal the electronic coupling of NiCoS/NC in atomic orbitals, modulation of electrons by the heterointerface and N-doping, and synergistic effect of dual active sites improving the inherent catalytic activity. The NiCoS/NC composite electrocatalyst exhibited a 177 mV small OER overpotential and a 132 mV small HER overpotential with Faraday efficiencies as high as 96% and 98% at 10 mA cm-2 current density. In the two-electrode system, it also requires only an ultra-low voltage of 1.52 V to achieve a 10 mA cm-2 current density, and it shows excellent long-term water splitting stability. This provides a new idea for the development of transition metal-based bifunctional electrocatalysts.

Keywords: Gelatine, In situ N-doped, dual active sites, Heterogeneous structure

Suggested Citation

Wei, Ying and Chen, Xiaomin and Xi, Chang and Zhou, Shaobo and Han, Sheng and Jiang, Jibo, The Dual Active Sites Reconstruction on Gelatin In-Situ Derived 3d Porous N-Doped Carbon for Efficient and Stable Water Splitting. Available at SSRN: https://ssrn.com/abstract=4657866 or http://dx.doi.org/10.2139/ssrn.4657866

Ying Wei

Shanghai Institute of Technology ( email )

China

Xiaomin Chen

Shanghai Institute of Technology ( email )

China

Chang Xi

Shanghai Institute of Technology ( email )

China

Shaobo Zhou

Shanghai Institute of Technology ( email )

China

Sheng Han

Shanghai Institute of Technology - School of Chemical and Environmental Engineering ( email )

Shanhai
China

Jibo Jiang (Contact Author)

Shanghai Institute of Technology ( email )

China

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