New progress has been made in the study of electrocatalytic total water splitting in the acid medium of Fujian Institute of Structure
Hydrogen energy is one of the most promising forms of green energy, and the electrocatalytic decomposition of water is an ideal process for obtaining high-purity hydrogen. In recent years, it has been found that using solid polymer electrolyte membranes to electrolyze water in an acidic medium can make hydrogen production and separation easier. Therefore, the research and development of metal Ir-based electrolyzed water catalysts with high activity and longevity in acidic media have also attracted the attention of many researchers. Existing studies have shown that Ir3 / 4 + and coordinated unsaturated O / Ir atoms (IrOx) in aqueous amorphous hydroxide show better catalytic activity than metal Ir nanoparticles, but how can The controlled synthesis of IrOx and how to maintain its stability in the process of electrolyzed water are still a huge challenge.
With the support of the National Natural Science Foundation of China, the National Key Project, the Strategic Pioneer Science and Technology Project of the Chinese Academy of Sciences, the Frontier Science Key Research Project, and the Fujian Provincial Natural Science Foundation, the Cao Rong team of the State Key Laboratory of Structural Chemistry at the Fujian Institute of Material Structure, Chinese Academy of Sciences Zhuang Wei's research group cooperated to design and synthesize a surface-controllable IrOx nanomaterial, which exhibited excellent electrocatalytic water splitting performance. The control experiment and DFT calculation results jointly verified that the formation mechanism of the surface composition and the effect on the structure of the catalytic active center can be effectively controlled by changing the composition of the raw materials. This work is the first time that the interaction between a six-membered melon ring (CB [6]) and metal iridium (Ir) nanoparticles has been used to successfully achieve a controlled synthesis of the surface composition. In the process of electrolyzing water, the overpotential of the catalyst at a current density of 10 mA / cm2 is only 1.56V. At the same time, its catalytic activity can be maintained for more than 20 hours at a current density of 5 mA / cm2. X-ray absorption spectroscopy and theoretical calculations were used to confirm the interaction between CB [6] and Ir. This interaction was beneficial to improve the stability of the catalyst and quantitatively analyze the existing surface IrOx. Related research results were published in ACS Energy Letters (DOI: 10.1021 / acsenergylett.9b00553).
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