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47 results on '"Chai, Maorong"'

36. Study on Attenuation Mechanism and Durability Improvement of Platinum-Carbon Catalysts for Proton Exchange Membrane Fuel Cells

Author

Chen, Ligang, Zhao, Wei, Ren, Yuchen, Liu, Zhiyang, Zhang, Luosha, An, Ziying, Jia, Yin, Li, Chunji, Xu, Min, Zhang, Ningyuan, Zhang, Yu, Xie, Kangjun, and Chai, Maorong

Abstract

The relationship between Pt particle size and activity and durability of Pt/C electrocatalysts on rotating disk electrodes is established and the results show that Pt/C electrocatalysts with particle size over 3.5 nm have excellent resistance to Pt particle decay and carbon corrosion. Further, the research results on the mechanism of Pt particle decay and carbon corrosion show that the Pt particle attenuation is composed of 80% Ostwald ripening and 20% particle agglomeration, and the carbon corrosion is affected by the catalytic action of Pt particles. Therefore, the above results show that regulating the Pt particle size to 3.5–4.0 nm can improve the durability of Pt/C electrocatalysts on RDE. To verify the accuracy of this conclusion and determine the optimal particle size range in practical application, single cells with 5 × 5 cm2is assembled to evaluate the performance and durability of cathode Pt/C electrocatalysts under H2/air. The results show that cathode Pt/C electrocatalysts with particle size between 3.5 nm and 3.8 nm have high single cell performance (2.3 A cm−2@0.65 V) and durability (A loss of 15 mV@0.8 A cm−2after 30000 cycles). These findings reveal the attenuation mechanism of Pt/C electrocatalysts and provide ideas for the development of high-durability Pt-based electrocatalysts for practical applications.

Published
2024
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45. Structural Evaluation of Coal-Tar-Pitch-Based Carbon Materials and Their Na + Storage Properties.

Author

Yin, Ruilin, Wang, Kun, Han, Beibei, Xu, Guiying, Li, Lixiang, An, Baigang, Ju, Dongying, Chai, Maorong, Li, Songnan, and Zhou, Weimin

Subjects
COAL tar, DOPING agents (Chemistry), CARBON, STORAGE, RAW materials
Abstract

Linking to the S element hybrid strategies, S-doped carbon materials having different macrostructures and defect concentrations are prepared by using sulfur and coal-tar-pitch as raw materials in a carbonization temperature range of 700–1000 °C. The evaluations of macrostructure and surface characteristics are performed through XRD, TEM, Raman and XPS measurements. Through the linear fitting among the Na+ storage capacity with ID/IG and d002 values, the correlations of Na+ storage capacity with macrostructures and defects are respectively investigated in detail. It is observed that S-doped carbon materials exhibit storage capacity at 120 mAh/g after the charge-discharge is being carried out 2000 cycles at 2.0 A/g. Studies have shown that adsorptions of introduced defects on graphene-like carbon sheets mainly play the role to enhance the storage capacity, and the expanded carbonaceous lamellar spaces of highly disordered and pseudo-graphitic macrostructures provide the channels for fast transfer of Na+. Our studies are able to provide references for designs and fabrications of coal tar pitch based soft carbon materials as sodium-ion batteries (SIBs) anodes when using heteroatoms doping methods. [ABSTRACT FROM AUTHOR]

Published
2021
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46. Fabrication and Sterilization Characteristics of Visible Light Photocatalyst of CuO/ZrO 2 /CB/Coal-Tar-Pitch-SAC.

Author

Xu, Ziang, Xu, Guiying, Han, Beibei, Wang, Kun, Ge, Hui, An, Baigang, Ju, Dongying, Chai, Maorong, Li, Lixiang, and Zhou, Weimin

Subjects
VISIBLE spectra, COAL tar, HETEROJUNCTIONS, PHOTOCATALYSTS
Abstract

To provide an effective method of green aquaculture, the photocatalysts of CuO/ZrO2/CB/coal-tar-pitch-SAC, which have visible light sterilization capacity, were successfully fabricated by coating ZrO2 and CuO on the surface of CB/coal-tar-pitch-SAC. The structures of synthesized CuO/ZrO2/CB/coal-tar-pitch-SAC were investigated by XRD, XPS and SEM measurements in detail. It was observed that CuO/ZrO2/CB/coal-tar-pitch-SAC materials possess obvious heterojunction structure and excellent visible light sterilization capacity when the prepared weight ratio of CuO, ZrO2 and CB/coal-tar-pitch-SAC is controlled as 0.03:0.3:1. Our studies can provide a beneficial reference for the design of photocatalysts with sterilization capacity in visible light. [ABSTRACT FROM AUTHOR]

Published
2021
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47. Promotion of Methane Steam Reforming Using Ruthenium-Dispersed Microporous Alumina Membrane Reactor

Author

Chai, Maorong, Machida, Masato, Eguchi, Koichi, and Arai, Hiromichi

Abstract

A membrane reactor with the microporous ruthenium-dispersed alumina membrane is effective in promoting low temperature methane steam reforming. In the temperature range of 300–500 °C, the membrane reactor attained the methane conversion with a twice as large as the equilibrium value by the selective removal of hydrogen from the reaction system.

Published
1993
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