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- Title
木质素磺酸钠衍生S/N共掺杂电催化剂结构调控与OER性能研究.
- Authors
王晓菲; 薛李静; 周海潮; 林绪亮; 邱学青
- Abstract
Oxygen evolution reaction (OER) is a core and rate-control process for the electrocatalytic water splitting. Due to the high energy barrier, the OER kinetics and overall water splitting efficiency are limited. Herein, bimetallic sulfide Co9S8-Ni3S2/SN-C catalyst was successfully prepared via oxidative ammonolysis of renewable lignosulfonates, and showed excellent electrocatalytic OER performance. The complex structure of sodium lignosulfonate modified with NHCO groups was investigated by comprehensive characterization, and the structural evolution mechanism of the precursor during pyrolysis and carbonization was revealed, with the formation of the active center Co9S8-Ni3S2 revealed as well. The strong binding of the modified lignin-carbon with metals enhanced the dispersion of active sites Co9S8 and Ni3S2. The close interaction between Co9S8-Ni3S2 and the defect doping of N onto the carbon carrier effectively regulated the surface electronic structure, and optimized the adsorption of the reaction intermediate, and thus improved the electrochemical OER reaction performance. The OER activity of Co9S8-Ni3S2/SN-C catalyst reached the highest level when m (H2O2)/m (LS) =1.5 for oxidative ammonolysis, and showed a lower overpotential (350 mV) than that of commercial Ru/C catalyst (420 mV) at a current density of 50mA·cm-2. This work provides an insight into the directional regulation of lignin-based functional materials and its development for highly efficient and stable OER electrocatalysis.
- Subjects
OXYGEN evolution reactions; METAL sulfides; AMMONOLYSIS; LIGNINS
- Publication
Journal of Guangdong University of Technology, 2023, Vol 40, Issue 6, p95
- ISSN
1007-7162
- Publication type
Article
- DOI
10.12052/gdutxb.230132