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Na-K liquid alloy:A review on wettability enhancement and ionic carrier selection mechanism

Chinese Chemical Letters 2021年第3期32卷 983-989页

作者： Xinran Li Jiahao Liu Cheng Chen Jian Yang Ziqiang Xu Mengqiang Wu Yuesheng Wang Zaghib Karim School of Materials and energy University of Electronic Science and Technology of ChinaChengdu 611731China center of excellence in Transportation electrification and energy storage Hydro-QuébecVarennesQC J3X1S1Canada

The intrinsic liquid interface of Na-K alloy allays concerns about dendrite growth on metal anodes that are thermodynamically within the room temperature(20-22℃).Nevertheless,it hinders the formation of a stable electrode structure due to the inferior wettability induced by considerable liquid tension.In addition,the dominant ionic carrier in the Na-K alloy is subject to multiple factors,which is not conducive to customized battery design.This review,based on recently reported frontier achievements on Na-K liquid anodes,summarizes practical strategies for promoting the wettability by hightemperature induction,capillary effect,vacuum infiltration,and solid interface protection.Furthermo re,four selection mechanisms of the dominant ionic carrier are presented:(1)ion property dominated,(2)cathode dominated,(3)separator dominated,and(4)solid electrolyte interface dominated.Notably,initial electrolytes in energy storage systems have been unable to play a decisive role in ionic selection.Utilizing a superior wettability strategy and simultaneously identifying the dominant ionic carrier can facilitate the tailored application of dendrite-free Na-K liquid anodes.

关键词： Liquid electrode Na-K alloy Dendrite inhibition Wettability improvement Carrier selectivity

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Promoting the charge separation and photoelectrocatalytic water reduction kinetics of Cu_(2)O nanowires via decorating dual-cocatalysts

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Journal of Materials Science & Technology 2021年第3期62卷 119-127页

作者： Mengmeng Zhang Jiajun Wang Yang Wang Jinfeng Zhang Xiaopeng Han Yanan Chen Yuesheng Wang Zaghib Karim Wenbin Hu Yida Deng School of Materials Science and Engineering Key Laboratory of Advanced Ceramics and Machining Technology of Ministry of EducationTianjin UniversityTianjin300072China Center of Excellence in Transformation Electrification and Energy Storage Hydro-Québec1806 Boulevard Lionel-BouletVarennesQuébecJ3X 1S1Canada Joint School of National University of Singapore and Tianjin University International Campus of Tianjin UniversityBinhai New CityFuzhou350207China

Developing high activity and low-cost materials to produce hydrogen by the sustainable way of photoelectrochemical is key to social development.The abundance and inexpensive Cu_(2)O has been received increasing research as its suitable energy level for photocatalytic water reduction.However,the fast charge recombination rate and the sluggish catalytic kinetics are the huge challenges facing the Cu_(2)O photoreduction.Here,the highly reactive Cu_(2)O@C-MoS_(2)photocathode is constructed by depositing dual-cocatalysts of the carbon layer and MoS_(2)nanosheets on Cu_(2)O nanowires to realize efficient water reduction.An impressive carrier concentration of 6.59×10^(23)cm^(-3)is received,which is 2.78 times of the bare Cu_(2)O,resulting in remarkable enhancement in photocurrent density of 3.34 times for the Cu_(2)O@CMoS_(2)photocathode.Moreover,the applied bias photon-to-current conversion efficiency of the bare Cu_(2)O enhanced 4.5 times from 0.16%to 0.72%in the Cu_(2)O@C-MoS_(2)photocathode.The analysis shows that the Cu_(2)O as light absorber,the carbon layer as electron transfer promoter,and MoS_(2)nanosheets as catalytic sites,thus facilitating chrage separation and enhancing catalytic kinetics.This system paves a feasible strategy for designing other photoelectrodes to realize efficient charge separation and high catalytic activity.

关键词： Photoelectrochemical water reduction Cu_(2)O nanowires Dual-cocatalysts modification Photocathode Charge separation

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Optimizing 3d spin polarization of CoOOH by in situ Mo doping for efficient oxygen evolution reaction

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Carbon energy 2024年第1期6卷 236-244页

作者： Zhichao Jia Yang Yuan Yanxing Zhang Xiang Lyu Chenhong Liu Xiaoli Yang Zhengyu Bai Haijiang Wang Lin Yang Key Laboratory of Green Chemical Media and Reactions School of Chemistry and Chemical EngineeringCollaborative Innovation Center of Henan Province for Green Manufacturing of Fine ChemicalsMinistry of EducationHenan Normal UniversityXinxiangHenanChina School of Physics Henan Normal UniversityXinxiangHenanChina Oak Ridge National Laboratory Electrification and Energy Infrastructures DivisionOak RidgeTennesseeUSA Department of Mechanical and energy Engineering Key Laboratory of Energy Conversion and Storage TechnologiesSouthern University of Science and TechnologyShenzhenGuangdongChina

Transition-metal oxyhydroxides are attractive catalysts for oxygen evolution reactions(OERs).Further studies for developing transition-metal oxyhydroxide catalysts and understanding their catalytic mechanisms will benefit their quick transition to the next catalysts.Herein,Mo-doped CoOOH was designed as a high-performance model electrocatalyst with durability for 20 h at 10 mAcm−2.Additionally,it had an overpotential of 260 mV(glassy carbon)or 215 mV(nickel foam),which was 78 mV lower than that of IrO_(2)(338 mV).In situ,Raman spectroscopy revealed the transformation process of CoOOH.Calculations using the density functional theory showed that during OER,doped Mo increased the spin-up density of states and shrank the spin-down bandgap of the 3d orbits in the reconstructed CoOOH under the electrochemical activation process,which simultaneously optimized the adsorption and electron conduction of oxygen-related intermediates on Co sites and lowered the OER overpotentials.Our research provides new insights into the methodical planning of the creation of transition-metal oxyhydroxide OER catalysts.

关键词： electrocatalyst in situ Raman Mo-doped CoOOH oxygen evolution reaction

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P2-type layered high-entropy oxides as sodium-ion cathode materials

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Materials Futures 2022年第3期1卷 171-184页

作者： Junbo Wang Sören L Dreyer Kai Wang Ziming Ding Thomas Diemant Guruprakash Karkera Yanjiao Ma Abhishek Sarkar Bei Zhou Mikhail V Gorbunov Ahmad Omar Daria Mikhailova Volker Presser Maximilian Fichtner Horst Hahn Torsten Brezesinski Ben Breitung Qingsong Wang Institute of Nanotechnology Karlsruhe Institute of Technology(KIT)Hermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany Helmholtz Institute Ulm(HIU)Electrochemical energy storage Helmholtzstrasse 1189081 UlmGermany Joint Research Laboratory Nanomaterials-Technische Universität Darmstadt and Karlsruhe Institute of Technology(KIT) Otto-Berndt-Strasse 364206 DarmstadtGermany Leibniz Institute for Solid State and Materials Research(IFW)Dresden Helmholtzstrasse 2001069 DresdenGermany INM-Leibniz Institute for New Materials Campus D2266123 SaarbrückenGermany Department for Materials Science and Engineering Saarland UniversityCampus D2266123 SaarbrückenGermany Saarene Saarland Center for Energy Materials and SustainabilityCampus C4266123 SaarbrückenGermany Bavarian center for Battery Technology(BayBatt) University of BayreuthUniversitätsstrasse 3095447 BayreuthGermany Department of Chemistry University of BayreuthUniversitätsstrasse 3095447 BayreuthGermany

P2-type layered oxides with the general Na-deficient composition Na_(x)TMO_(2)(x<1,TM:transition metal)are a promising class of cathode materials for sodium-ion batteries.The open Na+transport pathways present in the ... 详细信息

P2-type layered oxides with the general Na-deficient composition Na_(x)TMO_(2)(xtransformation and Mn dissolution upon cycling in a wide voltage range from 1.5 to 4.6 V.Advanced operando techniques and post-mortem analysis were used to probe the underlying reaction mechanism thoroughly.Overall,the high-entropy strategy is a promising route for improving the electrochemical performance of P2 layered oxide cathodes for advanced sodium-ion battery applications.

关键词： P2-type layered cathode high-entropy oxides sodium-ion battery gassing behavior manganese leaching

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