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10 results on '"Wu, Minghong"'

9. Irradiated Graphene Loaded with SnO2Quantum Dots for Energy Storage

Author

Huang, Ruting, Wang, Lijun, Zhang, Qian, Chen, Zhiwen, Li, Zhen, Pan, Dengyu, Zhao, Bing, Wu, Minghong, Wu, C. M. Lawrence, and Shek, Chan-Hung

Abstract

Tin dioxide (SnO2) and graphene are unique strategic functional materials with widespread technological applications, particularly in the areas of solar batteries, optoelectronic devices, and solid-state gas sensors owing to advances in optical and electronic properties. Versatile strategies for microstructural evolution and related performance of SnO2and graphene composites are of fundamental importance in the development of electrode materials. Here we report that a novel composite, SnO2quantum dots (QDs) supported by graphene nanosheets (GNSs), has been prepared successfully by a simple hydrothermal method and electron-beam irradiation (EBI) strategies. Microstructure analysis indicates that the EBI technique can induce the exfoliation of GNSs and increase their interlayer spacing, resulting in the increase of GNS amorphization, disorder, and defects and the removal of partial oxygen-containing functional groups on the surface of GNSs. The investigation of SnO2nanoparticles supported by GNSs (SnO2/GNSs) reveals that the GNSs are loaded with SnO2QDs, which are dispersed uniformly on both sides of GNSs. Interestingly, the electrochemical performance of SnO2/GNSs indicates that SnO2QDs supported by a 210 kGy irradiated GNS shows excellent cycle response, high specific capacity, and high reversible capacity. This novel SnO2/GNS composite has potential practical applications in SnO2electrode materials during Li+insertion/extraction.

Published
2015
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10. Amide Covalent Bonding Engineering in Heterojunction for Efficient Solar-Driven CO 2 Reduction.

Author

Hou W, Guo H, Wu M, and Wang L

Abstract

Inefficient charge separation and slow interfacial reaction dynamics significantly hamper the efficiency of photocatalytic CO 2 reduction. Herein, a facile EDC/NHS-assisted linking strategy was developed to enhance charge separation in heterojunction photocatalysts. Using this approach, we successfully synthesized amide-bonded carbon quantum dot- g -C 3 N 4 (CQD-CN) heterojunction photocatalysts. The formation of amide covalent bonds between CN and CQDs in the CN-CQD facilitates efficient carrier migration, CO 2 adsorption, and activation. Exploiting these advantages, the CN-CQD photocatalysts exhibit high selectivity with CO and CH 4 evolution rates of 79.2 and 2.7 μmol g -1 h -1 , respectively. These rates are about 1.7 and 3.6 times higher than those of CN@CQD and bulk CN, respectively. Importantly, the CN-CQD photocatalysts demonstrate exceptional stability, even after 12 h of continuous testing. The presence of the COOH* signal is identified as a crucial intermediate species in the conversion of CO 2 to CO. This study presents a covalent bonding engineering strategy for developing high-performance heterojunction photocatalysts for efficient solar-driven reduction of CO 2 .

Published
2023
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