Journal
CHEMICAL ENGINEERING JOURNAL
Volume 425, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.130455
Keywords
Atomic layer deposition; Sulfide; Nanocone arrays; Doping; Water splitting
Categories
Funding
- National Natural Science Foundation of China [61176108, 61774060]
- City University of Hong Kong Strategic Research Grant (SRG) [7005505]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars of State Education Ministry [-1098]
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In this study, Co-doped Ni3S2 nanocones were prepared on porous nickel foam by atomic layer deposition, showing high catalytic activity and low cost for water splitting. The electrocatalysts exhibited excellent catalytic performance, with small overpotential and Tafel slope, indicating great potential for efficient water splitting applications.
Developing non-precious nickel-based catalysts with high activity and low cost is a big challenge for industrial alkaline water splitting. Herein, Co-doped Ni3S2 nanocones (Co12@Ni3S2/NF) are prepared by vulcanizing a cobalt oxide nanofilm on the porous nickel foam (NF) by atomic layer deposition (ALD). The electrocatalysts boast a large specific surface area, abundant active sites for rapid diffusion of electrolyte ions, fast electron transportation, and high electrochemical activity. Especially, the Co12@Ni3S2/NF electrode exhibits excellent catalytic reactivity such as a small overpotential of 62 mV to attain a current density of 10 mA cm-2 and Tafel slope of 49 mV dec- 1 for HER as well as 297 mV versus RHE at 20 mA cm-2 and Tafel slope of 50.3 mV dec- 1 for OER. First-principles calculations show that the proper Co dopant concentration in Ni3S2 causes large surface lattice distortion resulting in high effective ionic charge of Co atoms to greatly enhance water splitting. The strategy and materials provide insights into the design and preparation of efficient, low-cost, and durable electrodes in water splitting applications.
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