Heteroatom-Induced Accelerated Kinetics on Nickel Selenide for Highly Efficient Hydrazine-Assisted Water Splitting and Zn-Hydrazine Battery

• Published in: Nano-micro letters 2023-12, Vol.15 (1), p.155-155, Article 155
• Main Authors: Wang, Hao-Yu, Wang, Lei, Ren, Jin-Tao, Tian, Wen-Wen, Sun, Ming-Lei, Yuan, Zhong-Yong
• Format: Article
• Language: English
• Subjects: Bifunctional electrocatalyst; Density functional theory; Electrocatalysts; Electrolysis; Energy conversion; Engineering; Heat treatment; Heteroatom doping; Hydrazine oxidation; Hydrazines; Hydrogen evolution reactions; Hydrogen production; Kinetics; Metal foams; Nanoscale Science and Technology; Nanostructure; Nanotechnology; Nanotechnology and Microengineering; Nickel; Oxidation; Reaction kinetics; Reaction mechanisms; Water electrolysis; Water splitting; Zinc; Zn-based batteries
• ISSN: 2311-6706; 2150-5551
• DOI: 10.1007/s40820-023-01128-z

Highlights Ultrathin P and Fe co-doped NiSe 2 nanosheets supported on modified Ni foam are synthesized, which shows desirable bifunctional electrocatalytic hydrogen evolution reaction (HER)/hydrazine oxidation reaction (HzOR) performance in hydrazine-assisted water electrolysis and Zn-Hz battery. The coexistence of P and Fe heteroatoms induces an accelerated “2 + 2” reaction mechanism with a two-step HER process and a two-step HzOR step. Hydrazine-assisted water electrolysis is a promising energy conversion technology for highly efficient hydrogen production. Rational design of bifunctional electrocatalysts, which can simultaneously accelerate hydrogen evolution reaction (HER)/hydrazine oxidation reaction (HzOR) kinetics, is the key step. Herein, we demonstrate the development of ultrathin P/Fe co-doped NiSe 2 nanosheets supported on modified Ni foam (P/Fe-NiSe 2 ) synthesized through a facile electrodeposition process and subsequent heat treatment. Based on electrochemical measurements, characterizations, and density functional theory calculations, a favorable “2 + 2” reaction mechanism with a two-step HER process and a two-step HzOR step was fully proved and the specific effect of P doping on HzOR kinetics was investigated. P/Fe-NiSe 2 thus yields an impressive electrocatalytic performance, delivering a high current density of 100 mA cm −2 with potentials of − 168 and 200 mV for HER and HzOR, respectively. Additionally, P/Fe-NiSe 2 can work efficiently for hydrazine-assisted water electrolysis and Zn-Hydrazine (Zn-Hz) battery, making it promising for practical application.