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Multiple-dimensioned defect engineering for graphite felt electrode of vanadium redox flow battery

Carbon Energy 2024年第2期6卷 143-153页

作者： Yingqiao Jiang Yinhui Wang Gang Cheng Yuehua Li Lei Dai Jing Zhu Wei Meng Jingyu Xi Ling Wang Zhangxing He School of Chemical Engineering North China University of Science and TechnologyTangshanChina Tsinghua Shenzhen International Graduate School Institute of Materials ResearchTsinghua UniversityShenzhenChina

The scarcity of wettability,insufficient active sites,and low surface area of graphite felt(GF)have long been suppressing the performance of vanadium redox flow batteries(VRFBs).Herein,an ultra-homogeneous multipledimensioned defect,including nano-scale etching and atomic-scale N,O codoping,was used to modify GF by the molten salt system.NH_(4)Cl and KClO_(3) were added simultaneously to the system to obtain porous N/O co-doped electrode(GF/ON),where KClO_(3) was used to ultra-homogeneously etch,and O-functionalize electrode,and NH4Cl was used as N dopant,respectively.GF/ON presents better electrochemical catalysis for VO_(2)+/VO_(2)+ and V3+/V2+ reactions than only O-functionalized electrodes(GF/O)and GF.The enhanced electrochemical properties are attributed to an increase in active sites,surface area,and wettability,as well as the synergistic effect of N and O,which is also supported by the density functional theory calculations.Further,the cell using GF/ON shows higher discharge capacity,energy efficiency,and stability for cycling performance than the pristine cell at 140 mA cm^(−2) for 200 cycles.Moreover,the energy efficiency of the modified cell is increased by 9.7% from 55.2% for the pristine cell at 260 mA cm^(−2).Such an ultra-homogeneous etching with N and O co-doping through“boiling”molten salt medium provides an effective and practical application potential way to prepare superior electrodes for VRFB.

关键词： graphite felt molten salt N O co-doping ultra-homogeneous etching vanadium redox flow battery

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CoFe-LDH nanowire arrays on graphite felt: A high-performance oxygen evolution electrocatalyst in alkaline media

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Chinese Chemical Letters 2022年第2期33卷 890-892页

作者： Biao Deng Jie Liang Luchao Yue Tingshuai Li Qian Liu Yang Liu Shuyan Gao Abdulmohsen Ali Alshehri Khalid Ahmed Alzahrani Yonglan Luo Xuping Sun Chemical Synthesis and Pollution Control Key Laboratory of Sichuan Province School of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu 610054China Institute for Advanced Study Chengdu UniversityChengdu 610106China School of Materials Science and Engineering Henan Normal UniversityXinxiang 453007China Chemistry Department Faculty of ScienceKing Abdulaziz UniversityP.O.Box 80203Jeddah 21589Saudi Arabia

Developing non-noble-metal oxygen evolution reaction(OER) electrocatalysts with high performance is critical to electrocatalytic water splitting. In this work, we fabricated Co Fe-layered double hydroxide(LDH) nanowire arrays on graphite felt(Co Fe-LDH/GF) via a hydrothermal method. The Co Fe-LDH/GF, as a robust integrated 3 D OER anode, exhibits excellent catalytic activity with the need of low overpotential of 252 and 285 mV to drive current densities of 10 and 100 mA/cm^(2) in 1.0 mol/L KOH, respectively. In addition, it also maintains electrochemical durability for at least 24 h. This work would open up avenues for the development of GF like attractive catalyst supports for oxygen evolution applications.

关键词： LDH graphite felt Electrocatalyst Oxygen evolution Alkaline media

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Electro-catalytic activity of CeO_(x) modified graphite felt for carbamazepine degradation via E-peroxone process

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Frontiers of Environmental Science & Engineering 2021年第6期15卷 331-340页

作者： Xinyu Wang Ye Jin Weirui Chen Ruini Zou Jinxin Xie Yiming Tang Xukai Li Laisheng Li School of Environment South China Normal UniversityGuangzhou 510006China Key Laboratory of Theoretical Chemistry of Environment Ministry of EducationGuangzhou 510006China Guangdong Provincial Engineering Technology Research Center for Drinking Water Safety Guangzhou 510006China Guangdong Provincial Key Laboratory of Functional Materials for Environmental Protection Guangzhou 510006China

E-peroxone(EP)was one of the most attractive AOPs for removing refractory organic compounds from water,but the high energy consumption for in situ generating H_(2)O_(2) and its low reaction efficiency for activating O_(3) under acidic conditions made the obstacles for its practical application.In this study,cerium oxide was loaded on the surface of graphite felt(GF)by the hydrothermal method to construct the efficient electrode(CeO_(x)/GF)for mineralizing carbamazepine(CBZ)via EP process.CeO_(x)/GF was an efficient cathode,which led to 69.4%TOC removal in CeO_(x)/GF-EP process with current intensity of 10 mA in 60 min.Moreover,CeO_(x)/GF had the flexible application in the pH range from 5.0 to 9.0,TOC removal had no obvious decline with decrease of pH.Comparative characterizations showed that CeO_(x)could enhance surface hydrophilicity and reduce the charge-transfer resistance of GF.About 5.4 mg/L H_(2)O_(2) generated in CeO_(x)/GF-EP process,which was 2.1 times as that in GF-EP process.The greater ozone utility was also found in CeO_(x)/GF-EP process.More O_(3) was activated into hydroxyl radicals,which accounted for the mineralization of CBZ.An interfacial electron transfer process was revealed,which involved the function of oxygen vacancies and Ce^(3+)/Ce^(4+)redox cycle.CeO_(x)/GF had the good recycling property in fifth times'use.

关键词： E-peroxone CeO_(x) graphite felt Carbamazepine Mineralization

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La and Sr Composite Oxides-modified graphite felt for Aqueous Organic Redox Flow Batteries

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Chemical Research in Chinese Universities 2020年第6期36卷 1255-1260页

作者： WANG Hui LI Dan CHEN Liuping HAN Hongjing Mine Salt Comprehensive Utilization Center of Jiangsu Province Chinasalt Jintan Co.Ltd.Changzhou 213200P.R.China Jiangsu Jiayi Thermal Power Co. Ltd.Changzhou 213200P.R.China School of QiDi(TUS)Renewable Energy Qinghai UniversityXining 810016P.R.China

In this study,aqueous organic redox flow batteries(AORFBs)with NaCl as supporting electrolyte were investigated.In AORFBs,the chlorine evolution reaction should be retarded,not the hydrogen evolution reaction.To enhance the catalytic activity of the graphite fel(GF)electrode,the metal oxides were proposed to decorate on the GF surface.Among the loading oxides,significant enhancement of the mass transfer and reaction activity was obtained by the presence of LaSrOx nanoparticles.X-Ray photoclectron spectroscopy and contact angle measurements revealed that the content of oxygen-containing groups and the hydrophilicity were remarkably inereased.After the electrode assem-bled in the battery,the LaSrO/GF electrode presented huge enhancement of the battery performance,obviously increasing in the battery capacity and efficiency.At a current of 50 Am/cm^(2),the energy efficiency(EE)of the battery increased from 54.76%to 61.37%by the LaSrO/GF electrode.Furthermore,the cyclability of the system tested that no obviously fading was observed after 100 cycles,signifying the excellent stability of the LaSrOx/GF electrode.

关键词： Redox flow battery Organic active molecule graphite felt La and Sr composite oxide

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ZIF-derived holey electrode with enhanced mass transfer and N-rich catalytic sites for high-power and long-life vanadium flow batteries

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Journal of Energy Chemistry 2022年第9期31卷 545-553,I0015页

作者： Yongbin Liu Lihong Yu Xin Liu Le Liu Jingyu Xi Institute of Materials Research Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055GuangdongChina School of Materials&Environmental Engineering Shenzhen PolytechnicShenzhen 518055GuangdongChina

Electrode materials with good redox kinetics,excellent mass transfer characteristics and ultra-high stability play a crucial role in reducing the life-cycle cost and prolonging the maintenance-free time of the vanadium flow batteries(VFB).Herein,a nitrogen-doped porous graphite felt electrode(N-PGF)is proposed by growing ZIF-67 nanoparticles on carbon fibers and then calcinating and acid etching.The multi-scale structure of“carbon fiber gap(electrolyte flow),micro/nano pore(active species diffusion)and Nitrogen active center(reaction site)”in N-PGF electrode effectively increases the catalytic sites and promotes mass transfer characteristics.Reasonable electrode design makes the battery show excellent rate performance and ultra-high cycling stability.The peak power density of the battery reaches 1006 mW cm^(-2).During 1000 cycles at 150 mA cm^(-2),the average discharge capacity and average discharge energy of N-PGF increase substantially by 11.6%and 23.4%compared with the benchmark thermal activated graphite felt,respectively.More excitingly,after ultra-long term(5000 cycles)operation at an ultra-high current density(300 mA cm^(-2)),N-PGF exhibits an unprecedented energy efficiency retention(99.79%)and electrochemical performance stability.

关键词： Vanadium flow battery Multi-scale pore electrode graphite felt Nitrogen-doping Cycling stability

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O/N/S trifunctional doping on graphite felts:A novel strategy toward performance boosting of cerium-based redox flow batteries

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Carbon Energy 2021年第5期3卷 752-761页

作者： Zhaolin Na Xinran Wang Xiaoting Liu Wenjing Li Xudong Sun Liaoning Engineering Laboratory of Special Optical Functional Crystals College of Environmental and Chemical EngineeringDalian UniversityDalianChina Foshan Graduate School Northeastern UniversityFoshanChina

The cerium-based redox flow battery(RFB)is regarded as a compelling gridscale energy storage technology to revolutionize the utilization of renewable energy by storing the energy in liquid electrolytes.However,its widespread implementation is impeded by the cerium redox reactions that exhibit slow kinetics on commercial graphite felt(GF)electrodes.Surface functionalization may be an available activation strategy to achieve a significant boost in the electrochemical performance of GFs.However,conventional chemical and/or electrochemical routes for the surface functionalization of GFs suffer from the issues of complication,and the deterioration of the resulting modified electrode surface over long-term cycle processes leads to catalytic activity decline.Here,we develop a facile and general strategy for introducing the functional groups to the electrode through the addition of L-cysteine into electrolytes.The-COOH,-NH_(2),and-SH groups in L-cysteine can induce oxygen/nitrogen/sulfur trifunctional doping on GF surfaces with lower deterioration rates,which enables the activated GFs to demonstrate a promising electrocatalytic activity toward cerium redox reactions and excellent durability when used as a cerium-based RFB electrode.This study proposes a rational strategy to overcome the intrinsic limitations of existing modification techniques for GFs and provides a potential pathway toward high-performance RFBs.

关键词： additive cerium electrocatalysis graphite felt redox flow battery

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Electrochemical Aziridination of Tetrasubstituted Alkenes with Ammonia

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CCS Chemistry 2022年第2期4卷 693-703页

作者： Shuai Liu Wenxuan Zhao Jin Li Na Wu Chang Liu Xin Wang Shuohao Li Yan Zhu Yong Liang Xu Cheng Jiangsu Key Laboratory of Advanced Organic Materials School of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu 210023 Jiangsu Provincial Engineering Laboratory of Advanced Materials for Salt Chemical Industry College of Chemical EngineeringHuaiyin Institute of TechnologyHuaianJiangsu 223003 Henan-Macquarie University Joint Center for Biomedical Innovation School of Life SciencesHenan UniversityKaifengHenan 475004 State Key Laboratory of Elemento-Organic Chemistry Nankai UniversityTianjin 300071

Ammonia(NH3)is an ideal nitrogen source in terms of availability,reactivity,safety,atom economy,environmental compatibility,and ease of isolation.However,its utility for amine synthesis is limited by its high bond dissociation energy,its strong coordination ability,and the difference between its reactivity and that of the product amines.Herein,we reported the first electrochemical protocol for direct syntheses of unprotected tetrasubstituted aziridines with NH3 and alkenes in the absence of an oxidant,which are highly challenging to achieve by other methods.The combination of graphite felt as the anode material and MeOH as the solvent was the key to the success of the protocol,and the effects of these factors were investigated by means of cyclic voltammetry and density functional theory calculations.

关键词： ammonia aziridination electrochemical graphite felt amination

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Prussian Blue/Platinum Nanoparticles/graphite felt Nanocomposite Electrodes:Application as Electrochemical Sensors

Prussian Blue/Platinum Nanoparticles/Graphite Felt Nanocompo...

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第十六届全国化学热力学和热分析学术会议

作者： Li-Juan Han~1,Jian Fang~1,Ji-Hua Zhao~(*,1),Wei-Guo Shen~(1,2) 1 School of chemistry and chemical Engineering,Lanzhou University,Lanzhou 730000, 2 School of chemistry and chemical Engineering,East China University of Science and Technology, Shanghai 200237

＜正＞A scalable method was developed to fabricate Prussian blue/Platinum nanoparticles/graphite felt（PB@Pt/GF） hybrid electrodes.The macroporosity of the GF along with the zeolite-like porosity of the deposited PB nanoparticles provided a double porous structure and improved the performances of PB@Pt/GF sensors for hydrogen peroxide significantly.

关键词： Electrochemical sensor Prussian blue Platinum nanoparticles graphite felt

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(TiO2-Fe)-graphite felt-SCE光电协同催化氧化2,4-二氯苯酚及其工艺研究

(TiO2-Fe)-Graphite Felt-SCE光电协同催化氧化2,4-二氯苯酚及其...

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中国化学会第八届水处理化学大会暨学术研讨会

作者：赵宝秀李湘中王鹏绿色化学与技术研究中心哈尔滨工业大学市政环境工程学院香港理工大学土木建筑工程学院绿色化学与技术研究中心哈尔滨工业大学市政环境工程学院

针对一般高级氧化技术降解有机污染物所存在的外加试剂、氧化能力及矿化程度低等问题,本文设计了（TiO2-Fe）-graphite felt-SCE三电极光电协同催化氧化体系并对其降解2,4-二氯苯酚工艺进行了性能研究,本工艺不但提高了2,4-二氯酚的降... 详细信息

针对一般高级氧化技术降解有机污染物所存在的外加试剂、氧化能力及矿化程度低等问题,本文设计了（TiO2-Fe）-graphite felt-SCE三电极光电协同催化氧化体系并对其降解2,4-二氯苯酚工艺进行了性能研究,本工艺不但提高了2,4-二氯酚的降解和矿化能力,而且还节省了外加药剂的费用。研究了电流密度分配,外加电压,pH 等主要因素对2,4-二氯酚降解的影响。此外,本工艺还考察了反应过程中H2O2的生成及积累情况。实验结果表明, 本工艺具有较高的H2O2生成效率:且此光电催化氧化体系可以在较宽的pH内工作。在较低的电流密度下反应60min, 2,4-二氯酚的降解率可达95％以上,而矿化率高达80％。

关键词： TiO2 H2O2 graphite felt 2,4-二氯苯酚光电催化

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A Polyaniline/MnO2/graphite felt Nanocomposite Prepared By Interfacial Chemical Technique And Its High Electrochemical Performance For Supercapacitors

A Polyaniline/MnO2/Graphite felt Nanocomposite Prepared By I...

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2014年全国高分子材料科学与工程研讨会

作者： WEN Na HE MingPing ZHENG Yuying College of Materials Science and Engineering Fuzhou University

Polyaniline/MnO/graphite felt(PMGF) composite,which can be used as a novel free-standing,flexible electrode for supercapacitors,was prepared through interfacial chemical technique,and the effects of react temperature ... 详细信息

关键词： Conducting polymer Manganese dioxide graphite felt Supercapacitors

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