Journal
ADVANCED SUSTAINABLE SYSTEMS
Volume 6, Issue 7, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adsu.202200060
Keywords
cobalt sulfide; hydrogen evolution reaction; lignin; overall water splitting; oxygen evolution reaction
Funding
- National Natural Science Foundation of China [31800495]
- Natural Science Foundation of Jiangsu Province [BK20181040]
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [XSJCX20-03]
- Qing Lan Project of Jiangsu Province
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This study presents a low-cost nitrogen and sulfur co-doped carbon-supported cobalt sulfide dual-functional electrocatalyst derived from imidazole modified lignin for overall water splitting. It demonstrates the good performance of the catalyst in the overall water splitting process.
The hydrogen production by water electrolysis has attracted great research interest as a sustainable approach for clean energy production. However, such process is plagued by the use of high-cost precious metal-based catalysts (such as Pt, RuO2). Hereby, the use of a low-cost Nitrogen and Sulfur co-doped carbon-supported cobalt sulfide dual-functional electrocatalyst derived from imidazole modified lignin for overall water splitting is presented. To introduce nitrogen and sulfur heteroatoms in the carbon structure, lignin is modified by imidazolation through thiol-alkynes click reaction. Imidazolelignin shows a strong chelation tendancy with cobalt salt, and N and the S co-doped cobalt sulfide catalyst (IL-Co@GC-PO) is obtained by pyrolysis. The IL-Co@GC-PO has an oxygen evolution potential of 1.57 V and a hydrogen evolution overpotential of 204 mV at a current density of 10 mA cm(-2). During the overall water splitting process, the IL-Co@GC-PO catalysts require only 1.58 V to reach a current density of 10 mA cm(-2), which is equivalent to the performance of the system composed of the noble metal Pt/C parallel to RuO2. This work not only provides a strategy for the preparation of N and S co-doped cobalt sulfide catalysts, but also provides guidance for using lignin as a carbon source to design and develop cheap electrocatalysts.
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