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Your search keyword '"Zhang, Yumin"' showing total 22 results
Start Over Author "Zhang, Yumin" Journal acs applied materials & interfaces
22 results on '"Zhang, Yumin"'

18. Amphiphilic Polyelectrolyte/Prodrug Nanoparticles Constructed by Synergetic Electrostatic and Hydrophobic Interactions with Cooperative pH-Sensitivity for Controlled Doxorubicin Delivery

Author

Huang, Pingsheng, primary, Wang, Weiwei, additional, Zhou, Junhui, additional, Zhao, Fuli, additional, Zhang, Yumin, additional, Liu, Jinjian, additional, Liu, Jianfeng, additional, Dong, Anjie, additional, Kong, Deling, additional, and Zhang, Jianhua, additional

Published
2015
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21. S, N Dual-Doped Graphene-like Carbon Nanosheets as Efficient Oxygen Reduction Reaction Electrocatalysts

Author

Li, Jiajie, Zhang, Yumin, Zhang, Xinghong, Huang, Jinzhen, Han, Jiecai, Zhang, Zhihua, Han, Xijiang, Xu, Ping, and Song, Bo

Abstract

Replacement of rare and precious metal catalysts with low-cost and earth-abundant ones is currently among the major goals of sustainable chemistry. Herein, we report the synthesis of S, N dual-doped graphene-like carbon nanosheets via a simple pyrolysis of a mixture of melamine and dibenzyl sulfide as efficient metal-free electrocatalysts for oxygen reduction reaction (ORR). The S, N dual-doped graphene-like carbon nanosheets show enhanced activity toward ORR as compared with mono-doped counterparts, and excellent durability in contrast to the conventional Pt/C electrocatalyst in both alkaline and acidic media. A high content of graphitic-N and pyridinic-N is necessary for ORR electrocatalysis in the graphene-like carbon nanosheets, but an appropriate amount of S atoms further contributes to the improvement of ORR activity. Superior ORR performance from the as-prepared S, N dual-doped graphene-like carbon nanosheets implies great promises in practical applications in energy devices.

Published
2017
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22. Direct Transformation from Graphitic C3N4to Nitrogen-Doped Graphene: An Efficient Metal-Free Electrocatalyst for Oxygen Reduction Reaction

Author

Li, Jiajie, Zhang, Yumin, Zhang, Xinghong, Han, Jiecai, Wang, Yi, Gu, Lin, Zhang, Zhihua, Wang, Xianjie, Jian, Jikang, Xu, Ping, and Song, Bo

Abstract

Carbon-based nanomaterials provide an attractive perspective to replace precious Pt-based electrocatalysts for oxygen reduction reaction (ORR) to enhance the practical applications of fuel cells. Herein, we demonstrate a one-pot direct transformation from graphitic-phase C3N4(g-C3N4) to nitrogen-doped graphene. g-C3N4, containing only C and N elements, acts as a self-sacrificing template to construct the framework of nitrogen-doped graphene. The relative contents of graphitic and pyridinic-N can be well-tuned by the controlled annealing process. The resulting nitrogen-doped graphene materials show excellent electrocatalytic activity toward ORR, and much enhanced durability and tolerance to methanol in contrast to the conventional Pt/C electrocatalyst in alkaline medium. It is determined that a higher content of N does not necessarily lead to enhanced electrocatalytic activity; rather, at a relatively low N content and a high ratio of graphitic-N/pyridinic-N, the nitrogen-doped graphene obtained by annealing at 900 °C (NGA900) provides the most promising activity for ORR. This study may provide further useful insights on the nature of ORR catalysis of carbon-based materials.

Published
2015
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