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Tuning Structural and Electronic Configuration of FeN_(4) via External S for Enhanced Oxygen Reduction Reaction

Energy & Environmental Materials 2024年第2期7卷 93-101页

作者： Shidong Li Lixue Xia Jiantao Li Zhuo Chen Wei Zhang Jiexin Zhu Ruohan Yu Fang Liu sungsik lee Yan Zhao Liang Zhou Liqiang Mai State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Foshan Xianhu Laboratory of the Advanced Energy Science and Technology Guangdong Laboratory Foshan 528200China Chemical Sciences and Engineering Division Argonne National Laboratory9700 South Cass AvenueLemontIL 60439USA NRC(Nanostructure Research Centre) Wuhan University of TechnologyWuhan 430070China X-ray Science Division Advanced Photon SourcesArgonne National Laboratory9700 South CassAvenueLemontIL 60439USA State Key Laboratory of Silicate Materials for Architectures International School of Materials Science and EngineeringWuhan University of TechnologyWuhan 430070China The Institute of Technological Sciences Wuhan UniversityWuhan 430072China Hubei Longzhong Laboratory Xiangyang 441000China

The Fe-N-C material represents an attractive oxygen reduction reaction electrocatalyst,and the FeN_(4)moiety has been identified as a very competitive catalytic active *** tuning of the coordination structure of FeN_(4)has an essential impact on the catalytic ***,we construct a sulfur-modified Fe-N-C catalyst with controllable local coordination environment,where the Fe is coordinated with four in-plane N and an axial external *** external S atom affects not only the electron distribution but also the spin state of Fe in the FeN_(4)active *** appearance of higher valence states and spin states for Fe demonstrates the increase in unpaired *** the above characteristics,the adsorption and desorption of the reactants at FeN_(4)active sites are optimized,thus promoting the oxygen reduction reaction *** work explores the key point in electronic configuration and coordination environment tuning of FeN_(4)through S doping and provides new insight into the construction of M-N-C-based oxygen reduction reaction catalysts.

关键词： coordination structure electronic configuration FeN_(4)moiety oxygen reduction reaction sulfur doping

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Strongly Anchoring Polysulfides by Hierarchical Fe3O4/C3N4 Nanostructures for Advanced Lithium-Sulfur Batteries

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Nano-Micro Letters 2020年第10期12卷 236-246页

作者： Soochan Kim Simindokht Shirvani‑Arani sungsik Choi Misuk Cho Youngkwan lee School of Chemical Engineering Sungkyunkwan UniversitySuwon 16419Republic of Korea Nuclear Science and Technology Research Institute(NSTRI) Tehran 14395‑834Iran

Li-S batteries have attracted considerable interest as nextgeneration energy storage devices owing to high energy density and the natural abundance of ***,the practical applications of Li-S batteries are hampered by the shuttle effect of soluble lithium polysulfides(LPS),which results in low cycle ***,a functional interlayer has been developed to efficiently regulate the LPS and enhance the sulfur utilization using hierarchical nanostructure of C3 N4(t-C3 N4)embedded with Fe304 nanospheres.t-C3 N4 exhibits high surface area and strong anchoring of LPS,and the Fe3 O4/t-C3 N4 accelerates the anchoring of LPS and improves the electronic *** combination of these materials leads to remarkable battery performance with 400%improvement in a specific capacity and a low capacity decay per cycle of 0.02%at 2 C over 1000 cycles,and stable cycling at 6.4 mg cm-2 for high-sulfur-loading cathode.

关键词： Hierarchical nanostructured C3N4 Fe3O4 nanosphere Interlayer Long-term cycling Lithium-sulfur battery

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Core Coolability Analysis at Light Water Reactor Accident Conditions

Core Coolability Analysis at Light Water Reactor Accident Co...

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The Fifth China-Korea Workshop on Nuclear Reactor Thermal Hydraulics

作者： Seunghoon Ahn Joosuk lee sungsik Kang Korea Institute of Nuclear Safety 19 Guseong Yuseong Daejeon Korea 305-338

Most nuclear reactor accidents are attributed to an imbalance between the heat generation rate of the nuclear core and heat removal capacity of the coolant, as often called the power-to-cooling mismatch. The PCM accidents exert thermal and mechanical load to the fuel rod, and if it exceed a fuel rod failure threshold the fuel fails. Core coolability depends on fuel rod failure mechanisms occurring mainly at two different modes: high cladding temperature and pellet-to- clad mechanical interaction. In the deterministic design basis analysis, they are represented by a loss of coolant accident （LOCA） and reactivity initiated accident （RIA）, respectively. This paper reviews the recent results of the international study on the RIA and LOCA core coolability triggered by the high burnup fuel issues. A preliminary R＆D plan was presented, which is devised to resolve the core coolability issues.

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