The Experts below are selected from a list of 105 Experts worldwide ranked by ideXlab platform
Haibo Tan - One of the best experts on this subject based on the ideXlab platform.
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perfectly ordered mesoporous iron nitrogen doped Carbon as highly efficient catalyst for oxygen reduction reaction in both alkaline and acidic electrolytes
Nano Energy, 2017Co-Authors: Haibo Tan, Xiangfen Jiang, Jing Tang, Zhongli Wang, Huayu Qian, Peng Mei, Victor MalgrasAbstract:Abstract Non-precious iron-nitrogen doped Carbon Material (Fe-N/C) is the most promising candidate to replace platinum-based catalysts for oxygen reduction reaction (ORR) taking place at the cathode in fuel cells. In this study, three-dimensionally (3D) ordered mesoporous Fe-N/C with open porous structure is successfully synthesized. The obtained shape is a rhombic dodecahedron which corresponds to a single mesoporous crystal with body-centered cubic structure (Im-3m). By applying an optimal post-treatment of NH3 activation, a high content of beneficial pyridinic nitrogen can be doped while maintaining the ordered mesoporous architecture with high surface area and large pore volume. Our mesoporous Fe-N/C greatly promotes ORR performance with a high onset potential of 1.018 V and limited-diffusion current density of 5.98 mA cm−2 in alkaline electrolyte. Interestingly, this mesoporous Fe-N/C also shows good ORR catalytic activity in acidic condition with onset potential and limited-diffusion current density as high as 0.935 V and 5.60 mA cm-2, respectively.
Zehui Zhang - One of the best experts on this subject based on the ideXlab platform.
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Direct synthesis of imines from nitro compounds and biomass-derived Carbonyl compounds over Nitrogen-Doped Carbon Material supported Ni nanoparticles
New Journal of Chemistry, 2021Co-Authors: Yanxin Wang, Quan Chi, Ziliang Yuan, Bing Liu, Zehui ZhangAbstract:A kind of Nitrogen-Doped Carbon Material and MgO co-supported Ni nanoparticle catalyst has been developed and demonstrates high activity, selectivity and stability.
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Synthesis of Co3O4/Nitrogen-Doped Carbon composite from metal-organic framework as anode for Li-ion battery
Journal of Alloys and Compounds, 2019Co-Authors: Jianghua Qiu, Zehui Zhang, Xing Cai, Guanghui GuoAbstract:Abstract In order to overcome the disadvantages of low electrical conductivity and pulverization of Co3O4 anode Material, a novel Co3O4/Nitrogen-Doped Carbon composite (Co3O4/N-C) was prepared by annealing a cobalt-based metal-organic framework (MOF) precursor. In this Co3O4/N-C composite, the Co3O4 particles are dispersed uniformly in the matrix of the Nitrogen-Doped Carbon with an average diameter of approximately 10 nm and a mass content of 22.6%. This approach has the advantages that first, the dispersed Co3O4 nanoparticles could increase the lithium ions storage capacity and alleviate the electrode pulverization during the lithium ions insertion/extraction processes; second, the Nitrogen-Doped Carbon Material could increase the electrical conductivity of the electrode Material and meanwhile serve as a buffer to relieve the structure collapse induced by the large volume change. The as-prepared Co3O4/N-C composite maintains a high reversible discharge capacity of 423 mAhg−1 after 100 cycles at the current density of 100 mAg−1, which is 129% times higher than that of the contrastive Nitrogen-Doped Carbon Material. Moreover, this strategy was verified to be effective to produce other transition metal oxides/Carbon composite for improving the performance of LIBs.
Yafei Kuang - One of the best experts on this subject based on the ideXlab platform.
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different types of nitrogen species in nitrogen doped Carbon Material the formation mechanism and catalytic role on oxygen reduction reaction
Electrochimica Acta, 2017Co-Authors: Zheng Huang, Liang Chen, Haihui Zhou, Zuowei Liao, Wenji Yang, Chaopeng Fu, Yi Gong, Yafei KuangAbstract:Abstract Nitrogen (N)-doped Carbon Materials (NCMs) are a promising catalyst for oxygen reduction reaction (ORR). However, the formation process of N species in NCMs has never been discussed and which type of N species created ORR active sites is still under debate, which restricts the exploitation of high performance NCMs catalysts. Herein, we firstly prepared a variety of N-doped Carbon nanotubes (NCNTs-t) with well-controlled N species derived from oxidized Carbon nanotubes (OCNTs-t) with well-defined oxidation degree, to investigate the transformation from oxygen-containing groups on OCNTs-t to consequential N species in NCNTs-t and the ORR catalytic role of different types of N species. A linear relationship existed between the oxygen content on OCNTs-t and the N content in NCNTs-t. Meanwhile, the ketone (C O) and carboxyl ( COOH) groups were favorable to form the pyridinic N, while the hydroxyl ( OH) and epoxy ( C(O)C ) groups tended to produce graphitic N. Furthermore, the pyridinic N was demonstrated to play the major role on the ORR activity, in which the active sites are the Carbon atoms bonded to the pyridinic N.
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Influence of Carbon Precursors on the Structure, Composition, and Oxygen Reduction Reaction Performance of Nitrogen-Doped Carbon Materials
The Journal of Physical Chemistry C, 2015Co-Authors: Liang Chen, Zhongxue Chen, Zheng Huang, Zhongyuan Huang, Yingfei Wang, Haihui Zhou, Yafei KuangAbstract:Graphene oxide (GO), oxidized unzipped Carbon nanotube (O-UCNT), and GO/O-UCNT composites were used as the Carbon precursors to synthesize Nitrogen-Doped graphene (NG), Nitrogen-Doped unzipped Carbon nanotube (NUCNT), and Nitrogen-Doped graphene/unzipped Carbon nanotube (NG-NUCNT) composites. The influence of these Carbon precursors on the synthesis of their corresponding Nitrogen-Doped Carbon Materials was systematically investigated. The results show that the synthesis of Nitrogen-Doped Carbon Materials not only depends upon the structure and composition of their corresponding Carbon precursors, but also the morphology and surface property. As for single Carbon precursor, the Carbon precursor with higher oxygen content tends to make the Nitrogen-Doped Carbon Material with higher nitrogen content. Besides, we find that Carbon precursor composites with 3D morphology and large specific surface areas contribute to fabricating Nitrogen-Doped Carbon Material with sufficient catalytic sites and high nitrogen c...
Chenghui Zhang - One of the best experts on this subject based on the ideXlab platform.
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Facile synthesis of porous Nitrogen-Doped Carbon for aerobic oxidation of amines to imines
Microporous and Mesoporous Materials, 2018Co-Authors: Ping Yang, Jingwei Zhang, Di Liu, Minjie Liu, Hao Zhang, Pengshan Zhao, Chenghui ZhangAbstract:Abstract A Nitrogen-Doped Carbon Material with developed porous structure was prepared by the simple single-step pyrolysis of sodium alginate and 1, 6-hexanediamine. Nitrogen-Doped Carbon catalysts were optimized and characterized, and their catalytic activities were investigated using the self-oxidative coupling of amine as model reaction. N2 adsorption-desorption exhibited that the introduction of 1, 6-hexanediamine could observably increase the specific surface area and pore volume of the Carbon Material. X-ray photoelectron spectroscopy confirmed N was incorporated successfully into the Carbon. Benefiting from these, Nitrogen-Doped Carbon Material exhibited high catalytic performance for the oxidation of amines to imines under solvent-free, air atmospheric conditions. And the Nitrogen-Doped Carbon possessed good reusability and applicability. Meanwhile, the Nitrogen-Doped Carbon Material was available, low cost and environment-friendly owing to the use of cheap, renewable natural starting Materials and simple synthetic procedure.
Victor Malgras - One of the best experts on this subject based on the ideXlab platform.
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perfectly ordered mesoporous iron nitrogen doped Carbon as highly efficient catalyst for oxygen reduction reaction in both alkaline and acidic electrolytes
Nano Energy, 2017Co-Authors: Haibo Tan, Xiangfen Jiang, Jing Tang, Zhongli Wang, Huayu Qian, Peng Mei, Victor MalgrasAbstract:Abstract Non-precious iron-nitrogen doped Carbon Material (Fe-N/C) is the most promising candidate to replace platinum-based catalysts for oxygen reduction reaction (ORR) taking place at the cathode in fuel cells. In this study, three-dimensionally (3D) ordered mesoporous Fe-N/C with open porous structure is successfully synthesized. The obtained shape is a rhombic dodecahedron which corresponds to a single mesoporous crystal with body-centered cubic structure (Im-3m). By applying an optimal post-treatment of NH3 activation, a high content of beneficial pyridinic nitrogen can be doped while maintaining the ordered mesoporous architecture with high surface area and large pore volume. Our mesoporous Fe-N/C greatly promotes ORR performance with a high onset potential of 1.018 V and limited-diffusion current density of 5.98 mA cm−2 in alkaline electrolyte. Interestingly, this mesoporous Fe-N/C also shows good ORR catalytic activity in acidic condition with onset potential and limited-diffusion current density as high as 0.935 V and 5.60 mA cm-2, respectively.