AI Article Synopsis
- Ultrathin nickel-based sulfide nanosheets are promising electrocatalysts for water splitting but their inconsistent thickness due to a nonlayered structure limits practical use.
- A new topochemical conversion approach was developed to create cobalt-doped nickel sulfide (Co-Ni S) nanosheets on Ni foam, allowing precise control over their synthesis and demonstrating strong electrocatalytic performance.
- This method not only enhances the performance of Co-Ni S in water splitting but also serves as a versatile strategy for synthesizing ultrathin nanosheets of various nonlayered materials like Ni, NiO, and NiP.
Article Abstract
Ultrathin nickel (Ni)-based sulfide nanosheets have been reported as excellent electrocatalysts for overall water splitting; however, the uncontrollability over thickness due to the nonlayered structure still hampers its practical application. Herein, a simple topochemical conversion strategy is employed to synthesize cobalt-doped Ni S (Co-Ni S ) ultrathin nanosheets on Ni foam. The Co-Ni S nanosheets are controlled synthesized by using Co-Ni(OH) ultrathin nanosheets as templates with anneal and sulfurization treatment, showing exceptional electrocatalytic activity. This template-assisted method can also be applied to obtain Ni, NiO, and NiP nanosheets, providing a universal strategy to synthesize ultrathin nanosheets of nonlayered materials. The overall water splitting of this Co-Ni S ultrathin nanosheets achieves a low voltage of 1.54 V at a current density of 10 mA cm and high durability in 1 m KOH, comparable to the best performance of electrochemical water splitting ever reported. The detailed structural transformation of Ni-based sulfides in the catalytic process and its mechanism are further explored both experimentally and theoretically.
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| http://dx.doi.org/10.1002/smll.202102097 | DOI Listing |
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