Energy gases (such as hydrogen, carbon monoxide, and oxygen) have attracted worldwide attention due to their potential applications in sustainable and efficient energy systems. The design and development of catalysts that can realize efficient underwater electrocatalytic gas production has become a current research hotspot in this field, and is facing the challenge of simultaneously improving the reaction mass transfer rate and the long-term stability of the catalyst.
Recently, with the support of the National Natural Science Foundation of China and the Chinese Academy of Sciences, Wang Tie's research group of the Institute of Chemistry, Chinese Academy of Sciences, based on the pre-template template-assisted printing strategy assembly work (Adv. Mater., 2017, 29 (46), 1703143), The micelle-shaped nanoparticles were successfully assembled into a strip-shaped microstructure, which achieved a faster gas production rate and higher physical stability compared with traditional drop-coated films. The researchers used a high-speed camera to investigate the bubble growth behavior during the reaction, and found that the bubble grows in a "Cassie" state on the narrow gap Pt SP5 and quickly detaches. When the band gap increases, the bubble is in the "Wenzel" state Sink into the gap, and the longer the bigger, the buoyancy force is greater than the adhesion force before leaving the catalyst surface. Combined with dynamic extensometer and theoretical analysis, it is confirmed that the adhesion force of bubbles on the surface of Pt SP5 is only ~ 2μN, and Pt SP5 has better stress dispersion effect. Therefore, compared with the thin-film electrode coated by drop, Pt SP5 is a band The electrode exhibits better physical stability. In addition, the advantages of template-assisted printing technology make the composition, size and shape of nanoparticles or molecules have great flexibility, so it is versatile and is expected to accelerate the oxygen evolution reaction (OER) and the electrochemical reduction of carbon dioxide to carbon monoxide. Related achievements were published in the Journal of the American Chemical Society under the title A general strategy to optimize gas evolution reaction via assembled striped-pattern superlattices, and were included in the magazine cover (J. Am. Chem. Soc. 2020, 142 (4): 1857 -1863), the first author is Song Qian.
Figure: The strip structure is used to accelerate the rate of underwater gas production and improve the stability of the catalyst
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