Citation: Qiang‐Qiang SUN, Peng‐Cheng ZHAO, Ruo‐Yu WU, Bao‐Yue CAO, Yi‐Meng WANG, Xue‐Mei FAN. Porous blade⁃like cobalt disulfide electrocatalyst boosting hydrazine⁃assistance energy⁃efficient hydrogen production[J]. Chinese Journal of Inorganic Chemistry, ;2023, 39(3): 422-432. doi: 10.11862/CJIC.2022.284 shu

Porous blade⁃like cobalt disulfide electrocatalyst boosting hydrazine⁃assistance energy⁃efficient hydrogen production

Research Centre of Grapheme Technology and Application, Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, School of Chemical Engineering and Modern Materials, Shangluo University, Shangluo, Shaanxi 726000, China

Corresponding author: Qiang‐Qiang SUN, sqq3c118@163.com
Received Date: 3 August 2022
Revised Date: 30 November 2022

Figures(6)

Here, we report a three-dimensional blade -like nanosheet cobalt disulfide electrocatalyst with CoS₂ as the main crystal phase with a small amount of the mixed NiO phase, which is fabricated in situ on nickel foam (NF) by one-step hydrothermal synthesis. When the molar ratio of cobalt and sulfur in the solution was 1∶5, the crystalline CoS₂/NF electrocatalyst with a three-dimensional porous blade-like structure composed of 10 nm nanosheets was obtained at 140 ℃ for 18 h. During hybrid water electrolysis in an alkaline medium containing hydrazine hydrate, CoS₂/NF electrode merely need 83 mV overpotential to deliver -10 mA·cm^-2 towards hydrogen evolution reaction (HER), while 51 mV (vs RHE) oxidation potential to drive 50 mA·cm^-2 towards hydrazine oxidation reaction (HzOR). Integrated into a hybrid cell towards hydrazine hydrate assisted water electrolysis, the CoS₂/NF couple required a cell voltage of only 0.550 V to afford 100 mA·cm^-2 current density, far lower than that of overall water splitting (2.075 V), giving rise to the significant decrease of power consumption and the great improvement of hydrogen-producing efficiency. As-prepared CoS₂/NF displayed excellent stability and durability towards HER or HzOR both in three-electrode and two-electrode systems. The formation of a nanoporous blade-like structure created a large number of micropores on the electrode surface, which led to the nearly 24-fold increased electrochemical active area (ECSA), and provided a huge amount of active sites and material transfer channels for the catalytic reaction. The formation of cobalt disulfide and nickel oxide phase synergically improved the intrinsic hydrogen evolution activity to a certain extent. The composition and structural characteristics of CoS₂/NF contribute to superior catalytic performance, and the structural advantage played the predominant role in outstanding catalytic performances. Using mechanism research, the reaction paths of CoS₂/NF in HER and HzOR are proposed, respectively.
- cobalt disulfide,
- hydrogen evolution reaction,
- hydrazine oxidation,
- synergistic catalysis,
- reaction path
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