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Fig. (a) Electrocatalyst preparation process; (b) TEM image of electrocatalyst; (c) Linear scan curve of electrocatalyst HER and OER performance; (d) Electrolyzed water experimental device and gas collection device.
Recently, the Institute of Solid State Physics and Physics, Institute of Solid State Physics, Chinese Academy of Sciences, has made new progress in the electrocatalytic decomposing of hydrogen and oxygen-producing catalysts.
The use of high-performance electrocatalysts to decompose water to produce hydrogen is an important research direction for the development of sustainable clean energy systems. Among them, reducing the overpotential in hydrogen evolution and oxygen evolution is a key technical problem, and it is related to whether the related technologies can be applied practically. To date, precious metals Pt and RuO2/IrO2 have been widely recognized as excellent hydrogen generation-HER and oxygen generation-OER catalyst materials, but their high cost and lack of resources have limited the wide application of these materials. Therefore, the development of alternative non-precious metal catalyst materials has become a research hotspot in recent years.
The researchers of this research group used Co-metal organic frameworks (MOFs) constructed from S, N ligands as precursors to obtain electrocatalyst materials with bifunctional catalytic activity (OER and HER) in alkaline media. MOFs are ideal precursor materials for the preparation of electrocatalysts, mainly because: their composition is rich in carbon sources for carbon structure growth; pyrolytic carbonization of the material has a porous structure and high specific surface; contains metal and non-metallic elements ( Such as nitrogen, sulfur, etc.) In-situ doping and providing more catalytically active sites during pyrolysis carbonization. In this research work, researchers first grown Co-MOFs constructed from nitrogen-containing 4,4'-bipyridyl and sulfur-containing thiophene-2,5-carboxylic acid dual ligands on graphene oxide sheets (Fig. 1(a). )), by further carbonization to obtain a core-shell structure Co/Co9S8 particle-loaded sulfur, nitrogen co-doped porous graphene sheet composite (Figure 1 (b)). The results show that the material as an electrocatalyst exhibits excellent dual-function catalytic activity of HER and OER, and can achieve full decomposition of hydrogen in the alkaline medium and production of oxygen (Fig. 1(d)), and its Faraday efficiency is calculated ( Decomposition of aquatic oxygen and oxygen efficiency) is close to 100%. The research work provides a new idea for the design and construction of multi-functional high-efficiency non-precious metal electrocatalysts and has important scientific value. Relevant research results were published in Nano Energy, in which Co/Co9S8@S, N-doped porous graphene sheets derived from S, N dual organic ligands assembled Co-MOFs as superior electrocatalysts for full water splitting in alkaline media, 30 (2016) 93-102].
The research was funded by the National Natural Science Foundation of China and the 100-person plan of the Chinese Academy of Sciences.
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