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Self-templated nitrogen-doped mesoporous carbon decorated with double transition-metal active sites for enhanced oxygen electrode catalysis

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Rare Metals 2020年第7期39卷 824-833页

作者： Meng-Fei Qiao Ying Wang Lei Li Guang-Zhi Hu Guo-An Zou Xamxikamar Mamat Ye-Min Dong Xun Hu Key Laboratory of Chemistry of Plant Resources in Arid Regions Xinjiang Technical Institute of Physics and ChemistryChinese Academy of ScienceUrumqi 830011China College of Biological Chemical Sciences and EngineeringJiaxing UniversityJiaxing 314001China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of SciencesShanghai 200050China School of Material Science and Engineering University of JinanJinan 250022China

The development of high-performance,low-cost bifunctional catalysts with long-term stability for the oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)is one of the most critical challenges for the large-scale application of metal-air ***,we report an advanced nitrogen-doped mesoporous carbon(NMC)composite(NiCo2O4/CoNx-NMC)formed from a mixture of Co-and Ni-hydroxide-infiltrated phenolic resin and melamine *** composite exhibits superior electrocatalytic activity,stability,and selectivity for the ORR and *** activity parameter(DE),which is an indicator of the overall catalytic activity of bifunctional catalysts,was 0.76 V for NiCo2O4/***,catalyst outperforms the majority of previously reported non-precious metal-based bifunctional *** remarkable ultra-high catalytic performance of NiCo2O4/CoNx-NMC for the ORR and OER can be attributed to the presence of different active sites of the CoNx structure and the formation of NiCo2O4 with the spinel structure,which was obtained by a stepwise pyrolysis *** synthesis strategy opens a new avenue for the rational design of highly active bifunctional electrocatalysts.

关键词： Bifunctional catalysis Oxygen reduction reaction Oxygen evolution reaction Pyrolysis strategy double active sites

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Bidirectional catalysis of Co_(0.4)Ni_(1.6)P for Li_(2)S_(1-2) deposition/decomposition reactions in Li-S batteries

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Science China Chemistry 2023年第8期66卷 2267-2273页

作者： Luluan Feng Shengping Wang Faculty of Materials Science and Chemistry China University of GeosciencesWuhan430074China

To improve the electrochemical activity of S electrodes in Li-S batteries,the synergistic electrocatalysis mechanism of Co_(0.4)Ni_(1.6)P with Ni and Co bimetal interactions is *** alternating crystal structure of Co and Ni regulates the adsorption and decomposition energy of Co_(0.4)Ni_(1.6)P to polysulfides and has the bidirectional catalysis for the Li_(2)S_(1-2)deposition/decomposition ***_(0.4)Ni_(1.6)P can promote the breaking of the S-S bond of Li_(2)S_(4) and decrease the decomposition energy barrier of Li_(2)*** regulation accelerates the discharge/charge reaction between S,polysulfides,and Li_(2)S and improves the kinetics of the S *** 1st,100^(th),and 200^(th) discharge capacity densities at 0.1 mA cm^(-2) of the S electrodes with a high sulfur loading were 1,405,987.2,and 828.4 m Ah gS^(-1),*** bidirectional catalytic mechanism is a novel idea for improving the electrochemical performance of Li-S batteries.

关键词： bidirectional catalysis double active sites S electrode separator Li-S batteries

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