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141 results on '"Shi, Meiqin"'

7. Enhanced durability of Pd/CeO2-C via metal–support interaction for oxygen reduction reaction.

Author

Mao, Xinbiao, Ou, Mingyu, Zhao, Wenjun, Shi, Meiqin, and Zheng, Lingxia

Abstract

It is a challenge to improve the long-term durability of Pd-based electrocatalysts for oxygen reduction reaction (ORR) in fuel cells. Herein, Pd/CeO2-C-T (T = 800 °C, 900 °C and 1000 °C) hybrid catalysts with metal–support interaction are prepared from Ce-based metal organic framework precursor. Abundant tiny CeO2 nanoclusters are produced to form nanorod structures with uniformly distributed carbon through a calcination process. Meanwhile, both carbon and CeO2 nanoclusters have good contact with the following deposited surfactant-free Pd nanoclusters. Benefited from the large specific surface area, good conductivity and structure integrity, Pd/CeO2-C-900 exhibits the best electrocatalytic ORR performance: onset potential of 0.968 V and half-wave potential of 0.857 V, outperforming those obtained on Pd/C counterpart. In addition, the half-wave potential only shifts 7 mV after 6000 cycles of accelerated durability testing, demonstrating robust durability. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Optimization of Electrochemical Reduction of Biomass Derived 5‐Hydroxymethylfurfural (HMF): A Volcano Plot and Bimetallic Catalysts.

Author

Luo, Xingyu, Xie, Cheng, Zhao, Zhefei, Shi, Meiqin, and Zheng, Huajun

Subjects
AB-initio calculations, HETEROGENEOUS catalysis, SYNTHETIC fibers, GIBBS' free energy, ACTIVATION energy
Abstract

2,5‐bis(hydroxymethyl)furan (BHMF) derived from 5‐Hydroxymethylfurfural (HMF) through a hydrogenation process has extensive applications in the production of resins, polymers, and artificial fibers. However, screening out the candidate and then modulating the active site to optimize the catalyst for high yield of BHMF are currently insufficient. In this study, Gibbs free energy diagrams of the reduction of HMF on 13 metals were presented, along with the identification of the rate‐determining step (RDS) with the highest reaction barrier for each metal. We attempted to construct a volcano plot for HMFRR reaction. Additionally, a strategy was proposed to adjust the reaction barriers of RDS by combining two appropriate metals. Further experiments confirmed that Pb with the lowest energy barrier exhibited the highest HMF conversion (BHMF selectivity) among single metals. The modified catalyst by doping Ag on Pb, further boosted the HMF conversion (BHMF selectivity) from 42.1 % (59.4 %) to 80.8 % (80.9 %), respectively. These results provide an approach to rationally design and construct the catalyst system for efficient conversion of HMF. [ABSTRACT FROM AUTHOR]

Published
2024
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12. Artery Occlusive Diseases

Author

Jing, Zaiping, Mao, Huajuan, Shi, Meiqin, Bao, Junmin, Zhao, Zhiqing, Wei, Xiaolong, Chen, Zhiyong, Jing, Zaiping, editor, Mao, Huajuan, editor, and Dai, Weihui, editor

Published
2018
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13. Arteriectasia

Author

Jing, Zaiping, Mao, Huajuan, Shi, Meiqin, Lu, Qingsheng, Feng, Rui, Wei, Xiaolong, Song, Chao, Jing, Zaiping, editor, Mao, Huajuan, editor, and Dai, Weihui, editor

Published
2018
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14. Case Studies

Author

Jing, Zaiping, Mao, Huajuan, Shi, Meiqin, Bao, Junmin, Chen, Zhiyong, Pei, Yifei, Wei, Xiaolong, Song, Chao, Yuan, Liangxi, Wang, Hongfei, Zhang, Lei, Tian, Wen, Jing, Zaiping, editor, Mao, Huajuan, editor, and Dai, Weihui, editor

Published
2018
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15. Arteriovenous Fistula

Author

Jing, Zaiping, Mao, Huajuan, Shi, Meiqin, Feng, Xiang, Song, Chao, Jing, Zaiping, editor, Mao, Huajuan, editor, and Dai, Weihui, editor

Published
2018
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16. Veno-occlusive Disease

Author

Jing, Zaiping, Mao, Huajuan, Shi, Meiqin, Bao, Junmin, Wei, Xiaolong, Wang, Hongfei, Jing, Zaiping, editor, Mao, Huajuan, editor, and Dai, Weihui, editor

Published
2018
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40. Artery Occlusive Diseases

Author

Chen Zhiyong, Xiaolong Wei, Shi Meiqin, Zaiping Jing, Junmin Bao, Huajuan Mao, and Zhiqing Zhao

Subjects
medicine.medical_specialty, business.industry, Ischemia, Arteriosclerosis, medicine.disease, Renal artery stenosis, Arterial occlusion, Stenosis, medicine.anatomical_structure, Internal medicine, medicine.artery, Occlusion, Cardiology, Medicine, Renal artery, business, Artery
Abstract

Arterial occlusions refer to a type of diseases mainly characterized by artery stenosis or occlusion. They are frequently seen in peripheral arteries, usually giving rise to the ischemia or necrosis of important distal tissues or organs, etc. With the advent of population aging, arteriosclerosis has become the pathogenesis basis of most occlusive diseases. This chapter mainly introduces clinical manifestations, endovascular surgery process, and intraoperative observation points of carotid artery stenosis, subclavian artery stenosis, renal artery stenosis, and lower extremity atherosclerotic occlusive disease.

Published
2018

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