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self-supporting and hierarchically porous Ni_(x)Fe-S/NiFe_(2)O_(4) heterostructure as a bifunctional electrocatalyst for fluctuating overall water splitting

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International Journal of Minerals,Metallurgy and Materials 2022年第5期29卷 1120-1131页

作者： Wenjing Yan Jintao Zhang Aijing Lü Songle Lu Yiwei Zhong Mingyong Wang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals University of Science and Technology BeijingBeijing 100083China

Stable non-noble metal bifunctional electrocatalysts are one of the challenges to the fluctuating overall water splitting driven by re-newable ***,a novel self-supporting hierarchically porous Ni_(x)Fe-S/NiFe_(2)O_(4) heterostructure as bifunctional electrocatalyst was constructed based on porous Ni-Fe electrodeposition on three-dimensional(3D)carbon fiber cloth,in situ oxidation,and chemical *** showed that the Ni_(x)Fe-S/NiFe_(2)O_(4) heterostructure with a large specific surface area exhibits good bifunctional activity and stability for both hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)because of the abundance of active sites,synergistic effect of the heterostructure,superhydrophilic surface,and stable,self-supporting *** results further confirmed that the Ni_(x)Fe-S phase in the heterostructure is transformed into metal oxides/hydroxides and Ni_(3)S_(2) during *** with the commercial 20wt%Pt/C||IrO_(2)-Ta_(2)O_(5) electrolyzer,the self-supporting Ni1/5Fe-S/NiFe_(2)O_(4)||Ni1/2Fe-S/NiFe_(2)O_(4) electrolyzer exhibits better stability and lower cell voltage in the fluctu-ating current density range of 10-500 mA/cm^(2).Particularly,the cell voltage of Ni1/5Fe-S/NiFe_(2)O_(4)||Ni1/2Fe-S/NiFe_(2)O_(4) is only approximately 3.91 V at an industrial current density of 500 mA/cm^(2),which is lower than that of the 20wt%Pt/C||IrO_(2)-Ta_(2)O_(5) electrolyzer(i.e.,approximately 4.79 V).This work provides a promising strategy to develop excellent bifunctional electrocatalysts for fluctuating overall water splitting.

关键词： self-supporting hierarchically porous structure heterostructure bifunctional catalyst overall water splitting

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self-supporting hierarchically micro/nano-porous Ni_(3)P-Co_(2)P-based film with high hydrophilicity for efficient hydrogen production

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Journal of Materials Science & Technology 2021年第6期65卷 118-125页

作者： Xiangtao Yu Xiangyu Ren Yanwei Zhang Zhangfu Yuan Zhuyin Sui Mingyong Wang Collaborative Innovation Center of Steel Technology University of Science and Technology BeijingBeijing 100083China School of Chemistry&Chemical Engineering Yantai UniversityYantai 264005China State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Designing efficient and stable non-precious metal HER(hydrogen evolution reaction)electrocatalysts with high large current density adaptability is significant for industrial application of hydrogen production by water ***,a facile strategy was developed to construct a multi-phase Ni3 P-Co_(2)P-(Ni-Co)film with self-supporting hierarchically micro/nano-porous structure by using bubble template method electrodeposition of self-supporting micro-porous Ni Co P film,oxygen-free annealing for phase separation producing Ni_(3)P-Ni-Co_(2)P-Co structure,and acid etching for constructing surface nano-porous *** effective active sites for HER was significantly increased due to the hierarchically micro/nano-porous structure,which not only enlarged the surface roughness,but enhanced the bubble detachment by improving the ***,the HER electrolysis durability was improved benefiting from the Ni_(3)P-Co_(2)P phases with high corrosion resistance(especially in acid solution)and the self-supporting film structure without ***,the Ni Co P-OA-AE film exhibited high HER catalytic performance,which delivered a current density of 10 m A cm^(-2)at a low overpotential of 42.9 and 39.7 m V in 1 M KOH and 0.5 M H_(2)SO_(4),*** also possessed high long-term electrolysis durability,and the cell voltage of water electrolysis using self-supporting porous Ni Co P-OA-AE||Ir O_(2)-Ta_(2)O_(5) electrolyzer at 500 m A cm^(-2)for 250 h in 0.5 M H_(2)SO_(4 )is only 2.9 V.

关键词： self-supporting Micro/nano-porous film High hydrophilicity Bubble detachment High HER(hydrogen evolution reaction) catalytic performance

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self-supporting and dual-active 3D Co-S nanosheets constructed by ligand replacement reaction from MOF for rechargeable Al battery

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Journal of Energy Chemistry 2022年第6期31卷 35-43,I0002页

作者： Aijing Lv Songle Lu Mingyong Wang Haotian Shi Wenjing Yan Shuqiang Jiao State Key Laboratory of Advanced Metallurgy University of Science and TechnologyBeijingBeijing 100083China Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals University of Science and TechnologyBeijingBeijing 100083China National Center for Materials Service Safety University of Science and Technology BeijingBeijing 100083China

Metal sulfides with high theoretical capacities are expected as promising cathode materials of Al batteries(AIBs). However, powdery active materials are mainly synthesized and loaded on current collector by insulating binder without capacity. Meanwhile, S as inert element in metal sulfides can not usually provide capacity. So, powdery metal sulfides only exhibit limiting practical capacity and poor cycling stability due to weak conductivity and low mass utilization. Herein, the novel self-supporting and dual-active Co-S nanosheets on carbon cloth (i.e. Co-S/CC) with hierarchically porous structure are constructed as cathode of AIBs. Co-S nanosheets are derived from ZIF-67 nanosheets on CC by a facile ligand replacement reaction. As a result, the binder-free Co-S/CC cathode with good conductivity delivers excellent initial discharge capacity of 383.4 m Ah g^(-1)(0.211 m Ah cm^(-2)) at current density of 200 m A g^(-1)and maintain reversible capacity of 156.9 m Ah g^(-1)(0.086 m Ah cm^(-2)) with Coulombic efficiency of 95.8% after 500 cycles,which are much higher than those of the traditional slurry-coating cathodes. Both Co and S as active elements in Co-S/CC contribute to capacity, which leads to a high mass utilization. This work provides a significant strategy for the construction of self-supporting metallic cathode for advanced high-energy density Al battery.

关键词： Cobalt sulfide Ligand replacement reaction self-supporting Aluminum battery

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A self-supporting,Surface Carbonized Filter Paper Membrane for Efficient Water-in-Oil Emulsion Separation

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Chinese Journal of Polymer Science 2021年第2期39卷 181-188,I0006页

作者： Jiang-Yong-Quan Cao Si-Chong Chen Jie Zhang Yang-Yang Xie Yu-Zhong Wang The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan)Sichuan UniversityCollege of ChemistrySichuan UniversityChengdu 610064China

Due to the important role of oil source in our life,the separation of water-in-oil emulsion is urgent and *** seperation technology has been an efficient and widely used method in separating oil-water ***,we report a versatile approach to fabricate surface carbonized membranes with self-standing property from biomass-derived precursor by synergistic charring of phytic acid,arginine and filter *** obtained membrane exhibited superhydrophobicity in oil,excellent fouling resistance,and self-supporting *** membrane can be cycle-used at least 12 times with high permeation flux(up to 1380 L·m^(-2)·h^(-1))and separation efficiency(up to 99.4%).

关键词： Water-in-oil emulsion separation Filter paper membrane Surface carbonized self-supporting

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Research on self-supporting T-shaped gate structure of GaN-based HEMT devices

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Chinese Physics B 2023年第6期32卷 551-555页

作者：张鹏李苗陈俊文刘加志马晓华 Key Laboratory of Wide Band Gap Semiconductor Materials and Devices School of MicroelectronicsXidian UniversityXi'an 710071China School of Advance Material and Nanotechnology Xidian UniversityXi'an 710071China

A self-supporting T-shaped gate(SST-gate) GaN device and process method using electron beam lithography are *** AlGaN/GaN high-electron-mobility transistor(HEMT) device with a gate length of 100 nm is fabricated by this *** current gain cutoff frequency(f_(T)) is 60 GHz,and the maximum oscillation frequency(f_(max)) is 104 *** current collapse has improved by 13% at static bias of(V_(GSQ),V_(DSQ))=(-8 V,10 V),and gate manufacturing yield has improved by 17% compared with the traditional floating T-shaped gate(FT-gate) device.

关键词： GaN high-electron-mobility transistor(HEMT) self-supporting T-gate

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Nickel-decorated TiO2 nanotube arrays as a self-supporting cathode for lithium-sulfur batteries

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Frontiers of Materials Science 2020年第3期14卷 266-274页

作者： Yuming Chen Wenhao Tang Jingru Ma Ben Ge Xiangliang Wang Yufen Wang Pengfei Ren Ruiping Liu Department of Materials Science and Engineering China University of Mining&Technology(Beijing)Beijing100083China Energy&Materials Engineering Center College of Physics and Materials ScienceTianjin Normal UniversityTianjin300387China

Lithium-sulfur batteries are considered to be one of the strong competitors to replace lithium-ion batteries due to their large energy ***,the dissolution of discharge intermediate products to the electrolyte,the volume change and poor electric conductivity of sulfur greatly limit their further ***,we proposed a self-supporting cathode of nickel-decorated TiO2 nanotube arrays(TiO2 NTs@Ni)prepared by an anodization and electrodeposition *** TiO2 NTs with large specific surface area provide abundant reaction space and fast transmission channels for ions and ***,the introduction of nickel can enhance the electric conductivity and the polysulfide adsorption ability of the *** a result,the TiO2 NTs@Ni-S electrode exhibits significant improvement in cycling and rate performance over TiO2 NTs,and the discharge capacity of the cathode maintains 719 mA·h·g−1 after 100 cycles at 0.1 C.

关键词： lithium-sulfur battery TiO2 self-supporting polysulfide intermediate

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Carbon-based flexible self-supporting cathode for lithium-sulfur batteries:Progress and perspective

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Carbon Energy 2021年第2期3卷 271-302页

作者： Qinghuiqiang Xiao Jinlin Yang Xiaodong Wang Yirui Deng Peng Han Ning Yuan Lei Zhang Ming Feng Chang‐an Wang Ruiping Liu Department of Materials Science and Engineering China University of Mining and Technology(Beijing)BeijingChina School of Materials Science and Engineering Tsinghua UniversityBeijingChina Department of Mechanical Engineering University of Alaska FairbanksFairbanksAlaskaUSA Department of Applied Physics Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of EducationJilin Normal UniversityChangchunChina

The flexible self-supporting electrode can maintain good mechanical and electrical properties while retaining high specific capacity,which meets the requirements of flexible ***-sulfur batteries(LSBs),as a new generation of energy storage system,hold much higher theoretical energy density than traditional batteries,and they have attracted extensive attention from both the academic and industrial *** of a proper substrate material is important for the flexible self-supporting *** materials,with the advantages of light weight,high conductivity,strong structural plasticity,and low cost,provide the electrode with a large loading space for the active material and a conductive *** makes the carbon materials meet the mechanical and electrochemical requirements of flexible *** this paper,the commonly used fabrication methods and recent research progresses of the flexible self-supporting cathode with a carbon material as the substrate are *** sulfur loading methods are summarized,which provides useful information for the structural design of the *** the first review article of the carbon-based flexible self-supporting LSB cathodes,it provides valuable guidance for the researchers working in the field of LSB.

关键词： carbon flexible lithium sulfur batteries self-supporting

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Green preparation of self-supporting platinum nanoflower catalyst and its electrocatalytic oxidation performance of methanol

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Carbon Resources Conversion 2023年第3期6卷 167-172页

作者： Zhen Lu Hongjie Kang Ji Li Jianpeng Shang Kun Yang Rui Liu Zuopeng Li Feng Feng Yong Guo Haidong Zhao School of Chemistry and Chemical Engineering Shanxi Datong UniversityDatong 037009China Datong Qinxiong Yunding Hydrogen Energy Technology Co. Ltd.Datong 037005China

The three-dimensional(3D)self-supporting Pt nanoflower catalyst was prepared by using Pt organic compounds as precursors in a low-temperature molten salt *** obtained Pt nanoflower nanoparticle can reach 400-500 nm with a face-centered cubic structure,which has the structural characteristics of a loose framework and more exposed active *** surfactant-free Pt nanoflower was directly used as methanol electrooxidation reaction(MOR)electrocatalysts without any pretreatment and activated carbon *** results of electrochemical catalytic oxidation of methanol showed that the Pt nanoflower catalyst exhibit more enhanced electrocatalytic oxidation performance toward methanol compared with the commercial platinum black *** green and effective method can be developed and expected to enable mass production of fuel cell catalysts.

关键词： Fuel cell self-supporting Pt nanoflower Methanol electrooxidation reaction

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Synthesis of Zeolite LTN-(SOD) self-supporting Membranes from SiO2-Rich Industrial Waste

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Journal of Materials Science and Chemical Engineering 2018年第3期6卷 68-84页

作者： Valeriy Petrov Josef-Christian Buhl Institute of Mineralogy Leibniz University Hannover Hannover Germany

Synthesis of zeolite LTN (“Linde Type N”) was investigated under insertion of a SiO2-rich filtration residue (FR) from waste water cleaning of the silane production. A new synthesis procedure was therefore developed applying a flotation mechanism with the aim to grow LTN in form of thin membrane like sheets. Preparation starts with preactivation of FR by slurrying first in alkaline solution, followed by an addition of aluminate solution and citric acid. The latter was added as suitable chelating agent for the initiation of the flotation process. In the course of these experiments, we succeeded in synthesizing zeo-lite LTN with more or less zeolite SOD as byproduct in the form of a stable compact membrane-like layer at low temperature of 60℃. The crystallization was performed under isotherm static conditions in an open reaction system without addition of organic templates as structure directing agents (OSDA’s). FR was utilized as a total substitute of sodium silicate in all experiments and an expansive pre-treatment procedure like calcinations was not needed. Furthermore, membrane formation with LTN of usual synthesis needs chemically functionalized supports. In contrast self-supporting membranous LTN layers were grown for the first time in the present study.

关键词： LTN Zeolite self-supporting Membrane 60℃ Synthesis Industrial Waste Flotation

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Corrosion engineering boosting bulk Fe_(50)Mn_(30)Co_(10)Cr_(10)high-entropy alloy as high-efficient alkaline oxygen evolution reaction electrocatalyst

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Journal of Materials Science & Technology 2022年第14期109卷 267-275页

作者： Pengfei Zhou Dong Liu Yuyun Chen Mingpeng Chen Yunxiao Liu Shi Chen Chi Tat Kwok Yuxin Tang Shuangpeng Wang Hui Pan Institute of Applied Physics and Materials Engineering University of Macao999078Macao Department of Physics and Chemistry Faculty of Science and TechnologyUniversity of Macao999078Macao Department of Electromechanical Engineering Faculty of Science and TechnologyUniversity of Macao999078Macao College of Chemical Engineering Fuzhou UniversityFuzhou 350116China

Oxygen evolution reaction(OER)is a critical process in electrocatalytic water ***,the development of low-cost,highly efficient OER electrocatalysts by a simple method that can be used for industrial application on a large scale is still a huge ***,high entropy alloy(HEA)has acquired extensive attention,which may provide answers to the current ***,we report bulk Fe_(50)Mn_(30)Co_(10)Cr_(10),which is prepared by 3D printing on a large scale,as electrocatalyst for OER with high catalytic ***,an easy approach,corrosion engineering,is adopted for the first time to build an active layer of honeycomb nanostructures on its surface,leading to ultrahigh OER performance with an overpotential of 247 mV to achieve a current density of 10 mA cm^(-2),a low Tafel slope of 63 mV dec^(-1),and excellent stability up to 60 h at 100 mA cm^(-2)in 1 M *** excellent catalytic activity mainly originates from:(1)the binder-free self-supported honeycomb nanostructures and multi-component hydroxides,which improve intrinsic catalytic activity,provide rich active sites,and reduce interfacial resistance;and(2)the diverse valence states for multiple active sites to enhance the OER *** findings show that corrosion engineering is a novel strategy to improve the bulk HEA catalytic *** expect that this work would open up a new avenue to fabricate large-scale HEA electrocatalysts by 3D printing and corrosion engineering for industrial applications.

关键词： Electrocatalysis High entropy alloy Corrosion engineering self-supporting Oxygen evolution reaction

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