Journal
CHEMICAL ENGINEERING JOURNAL
Volume 433, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.134472
Keywords
Nickel Sulfide; Hydrogen evolution reaction; Sulfion oxidation reaction; Low energy consumption; Electrocatalysis
Categories
Funding
- National Natural Science of China [52000178]
- Key Research and Development Plan of the Ministry of Science and Technology [2019YFD1100104, 2019YFC1906501]
- Engineering and Physical Sciences Research Council [EP/N010124/1]
- Harbin Institute of Technology [HC202158]
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This study presents a reliable method to fabricate leaf-like Co-doped Ni3S2 nanostructures with superior electrocatalytic activity and durability. The optimized electrocatalyst shows significantly reduced cell voltage in sulfion-containing electrolytes, indicating its great potential for energy-saving hydrogen production and environmentally friendly sulfur recovery.
Electrocatalytic oxidation of small molecules to replace sluggish water oxidation presents a promising strategy for clean hydrogen production with low energy consumption. Herein, we reported a reliable and universal method to fabricate the leaf-like Co-doped Ni3S2 architecture anchored on Ni mesh. The optimized Co-doped Ni3S2 electrocatalyst exhibits superior electrocatalytic activity toward the alkaline hydrogen evolution reaction (HER) and chemical oxidation as well as excellent durability. Specifically, a significantly reduced cell voltage of 0.80 V is attained at 50 mA cm-2 in sulfion-containing electrolytes, which is about 0.94 and 1.20 V lower than that of urea electrolysis and water splitting, respectively. In situ Raman spectroscopy and electrochemical characterization results imply that the desired oxidation state of the NiIII formed on the surface with shortened oxidation pathway accounts for the increased urea oxidation, whereas a direct electron transfer to surface active sites is responsible for superior sulfion oxidation. In situ spectroscopic evidences further unravel that the sulfion (S2-) were stepwisely oxidized to short-chain polysulfides including S(2)(2-)and S(4)(2-)and then to elemental sulfur (S-8). This work highlights that the integrated overall reaction holds the great promise for saving energy H-2 generation and environmentally friendly recovery of sulfur with enhanced electron utilization efficiency.
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