Li An,Panpan Zhou,Jie Yin,He Liu,Fengjuan Chen,Hongyan Liu,Yaping Du,Pinxian Xi
The synthesis of semiconducting nanoplates (NPs) with defined crystal phase is of particular interest, especially their intriguing properties related to the size, shape, and crystal phase. Herein, a liquid-state transformation process from hexagonal-phase CuS NPs is employed to fabricate the cubic-phase Cu2S NPs. The CuS NPs were converted into Cu2S NPs but maintained the morphology. The Cu2S NPs exhibit better oxygen evolution reaction (OER) activity than CuS NPs. Furthermore, the OER activity of Cu2S NPs can be improved by the addition of a glycine (Gly) solution. The Cu2S NPs with Gly in a phosphate buffer solution exhibit excellent OER activity and durability, which approaches that of the best known commercial Ir/C (20%) nanocatalyst. In this work, a good strategy for fabricating a noble-metal-free OER catalyst has been proposed, which could provide insight into developing new water oxidation catalysts with high activity.
In this work, a Cu2S monolithic catalyst with a nanosheet structure was prepared by treating copper foam with a liquid-phase vulcanization method. The surface of the catalyst was modified by a series of straightforward oxidation, reduction, and vulcanization processes, and in this way, the nanostructure was also changed from nanowires to granular and irregular nanosheets. This material can remove 100% of ozone at a concentration of 20 ppm and a gas hourly space velocity of 70,000 h–1, making it one of the best-reported performances among monolithic ozone decomposition catalysts. In situ diffuse reflectance infrared spectroscopy characterization was used to clarify the intermediate products in the ozone decomposition process, revealing the mechanism of sulfide semiconductor materials decomposing ozone. The liquid-phase vulcanization modification method reported in this work has universal applicability to other transition metal oxides and great potential for application in the field of the catalytic decomposition of harmful gas pollutants.
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