共查询到20条相似文献,搜索用时 15 毫秒
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Ming‐Xi Chen Mengzhao Zhu Ming Zuo Sheng‐Qi Chu Jing Zhang Yuen Wu Hai‐Wei Liang Xinliang Feng 《Angewandte Chemie (International ed. in English)》2020,59(4):1627-1633
The development of metal‐N‐C materials as efficient non‐precious metal (NPM) catalysts for catalysing the oxygen reduction reaction (ORR) as alternatives to platinum is important for the practical use of proton exchange membrane fuel cells (PEMFCs). However, metal‐N‐C materials have high structural heterogeneity. As a result of their high‐temperature synthesis they often consist of metal‐Nx sites and graphene‐encapsulated metal nanoparticles. Thus it is hard to identify the active structure of metal‐N‐C catalysts. Herein, we report a low‐temperature NH4Cl‐treatment to etch out graphene‐encapsulated nanoparticles from metal‐N‐C catalysts without destruction of co‐existing atomically dispersed metal‐Nx sites. Catalytic activity is much enhanced by this selective removal of metallic nanoparticles. Accordingly, we can confirm the spectator role of graphene‐encapsulated nanoparticles and the pivotal role of metal‐Nx sites in the metal‐N‐C materials for ORR in the acidic medium. 相似文献
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Inside Back Cover: Hollow Spheres of Iron Carbide Nanoparticles Encased in Graphitic Layers as Oxygen Reduction Catalysts (Angew. Chem. Int. Ed. 14/2014) 下载免费PDF全文
M.Sc. Yang Hu Dr. Jens Oluf Jensen Dr. Wei Zhang Dr. Lars N. Cleemann Prof. Wei Xing Prof. Niels J. Bjerrum Dr. Qingfeng Li 《Angewandte Chemie (International ed. in English)》2014,53(14):3749-3749
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Back Cover: MnxOy/NC and CoxOy/NC Nanoparticles Embedded in a Nitrogen‐Doped Carbon Matrix for High‐Performance Bifunctional Oxygen Electrodes (Angew. Chem. Int. Ed. 32/2014) 下载免费PDF全文
Dr. Justus Masa Dr. Wei Xia Dr. Ilya Sinev Anqi Zhao Dr. Zhenyu Sun Stefanie Grützke Philipp Weide Prof. Dr. Martin Muhler Prof. Dr. Wolfgang Schuhmann 《Angewandte Chemie (International ed. in English)》2014,53(32):8524-8524
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Ji Liang Yan Jiao Mietek Jaroniec Prof. Shi Zhang Qiao 《Angewandte Chemie (International ed. in English)》2012,51(46):11640-11640
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Ming-Xi Chen Mengzhao Zhu Dr. Ming Zuo Dr. Sheng-Qi Chu Dr. Jing Zhang Prof. Yuen Wu Prof. Hai-Wei Liang Prof. Xinliang Feng 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(4):1644-1650
The development of metal-N-C materials as efficient non-precious metal (NPM) catalysts for catalysing the oxygen reduction reaction (ORR) as alternatives to platinum is important for the practical use of proton exchange membrane fuel cells (PEMFCs). However, metal-N-C materials have high structural heterogeneity. As a result of their high-temperature synthesis they often consist of metal-Nx sites and graphene-encapsulated metal nanoparticles. Thus it is hard to identify the active structure of metal-N-C catalysts. Herein, we report a low-temperature NH4Cl-treatment to etch out graphene-encapsulated nanoparticles from metal-N-C catalysts without destruction of co-existing atomically dispersed metal-Nx sites. Catalytic activity is much enhanced by this selective removal of metallic nanoparticles. Accordingly, we can confirm the spectator role of graphene-encapsulated nanoparticles and the pivotal role of metal-Nx sites in the metal-N-C materials for ORR in the acidic medium. 相似文献
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Inside Back Cover: Copper–Organic Framework Fabricated with CuS Nanoparticles: Synthesis,Electrical Conductivity,and Electrocatalytic Activities for Oxygen Reduction Reaction (Angew. Chem. Int. Ed. 49/2016) 下载免费PDF全文
Keumnam Cho Prof. Sung‐Hwan Han Prof. Myunghyun Paik Suh 《Angewandte Chemie (International ed. in English)》2016,55(49):15443-15443
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Inside Back Cover: Low‐Coordinated Edge Sites on Ultrathin Palladium Nanosheets Boost Carbon Dioxide Electroreduction Performance (Angew. Chem. Int. Ed. 36/2018) 下载免费PDF全文
Wenjin Zhu Lei Zhang Piaoping Yang Congling Hu Zhibin Luo Xiaoxia Chang Prof. Dr. Zhi‐Jian Zhao Prof. Dr. Jinlong Gong 《Angewandte Chemie (International ed. in English)》2018,57(36):11821-11821
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Inside Cover: Graphene‐Supported Ultrafine Metal Nanoparticles Encapsulated by Mesoporous Silica: Robust Catalysts for Oxidation and Reduction Reactions (Angew. Chem. Int. Ed. 1/2014) 下载免费PDF全文
Dr. Lu Shang Tong Bian Baihui Zhang Dr. Donghui Zhang Prof. Li‐Zhu Wu Prof. Chen‐Ho Tung Prof. Yadong Yin Prof. Tierui Zhang 《Angewandte Chemie (International ed. in English)》2014,53(1):2-2
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Inside Back Cover: Monodisperse Dual‐Functional Upconversion Nanoparticles Enabled Near‐Infrared Organolead Halide Perovskite Solar Cells (Angew. Chem. Int. Ed. 13/2016) 下载免费PDF全文
Dr. Ming He Dr. Xinchang Pang Xueqin Liu Beibei Jiang Yanjie He Prof. Henry Snaith Prof. Zhiqun Lin 《Angewandte Chemie (International ed. in English)》2016,55(13):4367-4367