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Recent insights on iron based nanostructured electrocatalyst and current status of proton exchange membrane fuel cell for sustainable transport

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Journal of Energy Chemistry 2022年第6期31卷 466-489,I0013页

作者： Mohamedazeem M.Mohideen Adiyodi Veettil Radhamani Seeram Ramakrishna Yen Wei Yong Liu Beijing Key Laboratory of Advanced Functional Polymer Composites College of Materials Science and EngineeringBeijing University of Chemical TechnologyBeijing 100029China Department of Physics and Nanotechnology SRM Institute of Science and TechnologyKattankulathur 603203India Center for Nanofibers and Nanotechnology National University of SingaporeSingapore 1157Singapore Department of Chemistry Key Lab of Bioorganic Phosphorus Chemistry&Chemical BiologyTsinghua UniversityBeijing 100084China

Bridging the performance gap of the electrocatalyst between the rotating disk electrode(RDE) and membrane electrode assembly(MEA) level testing is the key to reducing the total cost of proton exchange membrane fuel cell(PEMFC) vehicles. Presently, platinum metal accounts for ~42% of the total cost of the PEMFC vehicles for usage in the cathode catalyst layer, where the sluggish oxygen reduction reaction(ORR) occurs. An alternative to the platinum catalyst, the Fe-N-C catalyst has attracted considerable interest for PEMFC due to its cost-effectiveness and high catalytic activity towards ORR. However, the excellent ORR activity of Fe-N-C obtained from RDE studies rarely translates the same performance into MEA operating conditions. Such a performance gap is mainly attributed to the lack of atomic-level understanding of Fe-N-C active sites and their ORR mechanism. Besides, unless the cost of expensive electrocatalyst is reduced, the total operation cost of the PEMFC vehicles remains constant. Therefore,developing highly efficient Fe-N-C catalysts from academic and industrial perspectives is critical for commercializing PEMFC vehicles. Here, the scope of the review is three-fold. First, we discussed the atomiclevel insights of Fe-N-C active sites and ORR mechanism, followed by unraveling the different iron-based nanostructured ORR electrocatalysts, including oxide, carbide, nitride, phosphide, sulfide, and singleatom catalysts. And then we bridged their ORR catalytic performance gap between the RDE and MEA tests for real operating conditions of PEMFC vehicles. Second, we focused on bridging the cost barriers of PEMFC vehicles between capital, operation, and end-user. Finally, we provided the path to achieve sustainable development goals by commercializing PEMFC vehicles for a better world.

关键词： Proton exchange membrane fuel cell(PEMFC) Active sites Iron-based nanostructure Sustainable development goals

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engineering hierarchical heterostructure material based on metal-organic frameworks and cotton fiber for high-efficient microwave absorber

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Nano Research 2022年第8期15卷 6841-6850页

作者： Yan Guo Hu Liu Dedong Wang Zeinhom M.El-Bahy Jalal T.Althakafy Hala M.Abo-Dief Zhanhu Guo Ben Bin Xu Chuntai Liu Changyu Shen Key Laboratory of Materials Processing and Mold(Zhengzhou University) Ministry of EducationNational Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou 450002China Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City 11884CairoEgypt Department of Chemistry Faculty of Applied ScienceUmm Al-Qura UniversityMecca 21955Saudi Arabia Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif 21944Saudi Arabia Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA Department of Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle upon TyneNE18STUK

Rational construction of hierarchical multi-component materials with abundant heterostructure is evolving as a promising strategy to achieve excellent metal-organic frameworks(MOFs)based electromagnetic wave(EMW)***,hierarchical heterostructure WS_(2)/CoS_(2)@carbonized cotton fiber(CCF)was fabricated using the ZIF-67 MOFs nanosheets anchored cotton fiber(ZIF-67@CF)as a precursor through the tungsten etching,sulfurization,and carbonization *** from the synergetic effect of dielectric-magnetic dual-loss mechanism,the hierarchical heterostructure and multicomponent of WS_(2)/CoS_(2)@CCF also display improved impedance ***,numerous W-S-Co bands and heterojunction interfaces of heterogeneous WS_(2)/CoS_(2)are beneficial to promoting additional interfacial/dipole polarization loss and conductive loss,thereby enhancing the EMW attenuation *** on the percolation theory,a good balance between impedance matching and EMW absorption capacity was achieved for the WS_(2)/CoS_(2)@CCF/paraffin composite with 20 wt.%filler loading,exhibiting strong EMW absorption capability with a minimum reflection loss(RLmin)value of−51.26 dB at 17.36 GHz with 2 mm thickness and a maximum effective absorption bandwidth(EABmax)as wide as 6.72 *** research will provide new guidance for designing high-efficient MOFs derived EMW absorbers.

关键词： hierarchical heterostructure sulfurization metal-organic framework microwave absorber

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Flexible yet impermeable composites with wrinkle structured BNNSs assembling for high-performance thermal management

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npj Flexible Electronics 2024年第1期8卷 568-576页

作者： Guilei Guo Yijie Liu Yafei Ding Wenjie Liu Guimei Zhu Xiaoli Hao Xingyi Huang Jianfei Xia Baowen Li Tong-Yi Zhang Bin Sun College of Electronics and Information Qingdao University266071 QingdaoPR China Department of Polymer Science and Engineering Shanghai Key Laboratory of Electrical Insulation and Thermal AgingShanghai Jiao Tong University200240 ShanghaiPR China School of Electrical Engineering Southwest Jiaotong University611756 ChengduChina Department of Materials Science and Engineering Southern University of Science and Technology518055 ShenzhenPR China School of Microelectronics Southern University of Science and Technology518055 ShenzhenPR China College of Chemistry and Chemical Engineering Shandong Sino-Japanese Center for Collaborative Research of Carbon NanomaterialsInstrumental Analysis Center of Qingdao UniversityQingdao University266071 QingdaoPR China Department of Physics Southern University of Science and Technology518055 ShenzhenPR China Guangzhou Municipal Key Laboratory of Materials Informatics Sustainable Energy and Environment ThrustAdvanced Materials ThrustHong Kong University of Science and Technology(Guangzhou)511400 GuangzhouPR China Weihai Innovation Research Institute of Qingdao University 264200 WeihaiPR China

Efficient thermal management has becomeone of the most critical issues of electronics because of the high heat flux generated from highly integrated,miniaturized,and increased *** we report highly flexible composites with aligned and overlapping interconnected boron nitride nanosheets(BNNSs)assembled in wrinkle *** high in-plane thermal conductivity of more than 26.58Wm^(−1) K^(−1),such structure rendered enhanced through-plane conduction along with increasing *** thermal interface materials(TIMs)of both rigid and flexible devices,the composites revealed an outstanding thermal cooling capability outperforming some commercial *** a record-long bending process of more than 3000 cycles,the maximum temperature fluctuation of the flexible device with 100%-prestrained composite was only within 0.9℃,less than one-third of that with commercial thermal ***,the composite revealed a superior impermeability for flexible *** results illustrate that the composites could be an ideal candidate for the thermal management of emerging flexible electronics.

关键词： composites composite thermal

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Interface-induced polymerization strategy for constructing titanium dioxide embedded carbon porous framework with enhanced chemical immobilization towards lithium polysulfides

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Nano Research 2024年第3期17卷 1473-1481页

作者： Yue Ouyang Xiaoxiao Li Jiexin Zhu Wei Zong Yuhang Dai Xuan Gao Wei Zhang Shengyuan Yang Roohollah Bagherzadeh Feili Lai Yue-E Miao Tianxi Liu State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and EngineeringDonghua University2999 North Renmin RoadShanghai 201620China The Key Laboratory of Synthetic and Biological Colloids Ministry of EducationSchool of Chemical and Material EngineeringJiangnan UniversityWuxi 214122China Advanced Fibrous Materials LAB Institute for Advanced Textile Materials and Technologies(ATMT)School of Advanced Materials and ProcessesAmirkabir University of TechnologyTehran 15914Iran Christopher Ingold Laboratory Department of ChemistryUniversity College London20 Gordon StreetLondon WC1H 0AJUK Department of Chemistry KU LeuvenCelestijnenlaan 200FLeuven 3001Belgium

The shuttle effect induced by soluble lithium polysulfides(LiPSs)is known as one of the crucial issues that limit the practical applications of lithium-sulfur(Li-S)***,a titanium dioxide nanoparticle embedded in nitrogen-doped porous carbon nanofiber(TiO_(2)@NCNF)composite is constructed via an interface-induced polymerization strategy to serve as an ideal sulfur *** the protection of the nanofiber walls,the uniformly dispersed TiO_(2) nanocrystalline can act as capturing centers to constantly immobilize LiPSs towards durable sulfur ***,the mesoporous microstructure in the fibrous framework endows the TiO_(2)@NCNF host with strong physical reservation for sulfur and LiPSs,sufficient pathways for electron/ion transfer,and excellent endurance for volume *** expected,the sulfur-loaded TiO_(2)@NCNF composite electrode presents a fabulous rate performance and long cycle lifespan(capacity fading rate of 0.062%per cycle over 500 cycles)at 2.0 ***,the assembled Li-S batteries harvest superb areal capacity and cycling stability even under high sulfur loading and lean electrolyte conditions.

关键词： interface-induced polymerization electrospun porous nanofibers lithium-sulfur(Li-S)batteries high sulfur loading lithium polysulfides(LiPSs)immobilization

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Developments of polyurethane in biomedical applications:A review

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Resources chemicals and Materials 2023年第4期2卷 262-276页

作者： Minghui Cui Zheng Chai Yao Lu Jin Zhu Jing Chen Department of Materials Science and Engineering Shenyang University of Chemical TechnologyShenyang 110142PR China Key Laboratory of Bio-based Polymeric Materials Technology and Application of Zhejiang Province Division of Polymer and Composite MaterialsNingbo Institute of Material Technology and EngineeringChinese Academy of SciencesZhejiangNingbo 315201PR China

Polyurethane is an excellent and widely used polymer *** synthesizing polyurethane,the structure of soft and hard segments in polyurethane could be adjusted,which can obtain better properties than other polymer materials,such as good mechanical properties and *** recent years,due to their excellent chemical stability,biocompatibility,and low cytotoxicity,polyurethanes have been widely used for biomedical *** solve the problems of degradation and recycling,the development of bio-based polyurethane has also become a current hot *** paper summarizes the research progress and applications of polyurethane materials for dressings,skin sensors,orthopedics,and *** also looks forward to the future development of polyurethane medical materials.

关键词： Polyurethane Dressings Skin sensors Orthopedics Cardiovascular applications

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Clusteroluminescence:A gauge of molecular interaction

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Chinese chemical Letters 2023年第5期34卷 165-173页

作者： Bin Liu Bo Chu Lixun Zhu Haoke Zhang Wang-Zhang Yuan Zheng Zhao Wen-Ming Wan Xing-Hong Zhang School of Energy and Power Engineering North University of ChinaTaiyuan 030051China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China School of Chemistry and Chemical Engineering Frontiers Science Center for Transformative MoleculesShanghai Key Lab of Electrical Insulation and Thermal AgingShanghai Electrochemical Energy Devices Research CenterShanghai Jiao Tong UniversityShanghai 200240China School of Science and Engineering The Chinese University of Hong KongShenzhen 518172China State Key Laboratory of Structural Chemistry Key Laboratory of Coal to Ethylene Glycol and Its Related TechnologyCenter for Excellence in Molecular SynthesisFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China

Clusteroluminescence(CL)materials,as an emerging class of luminescent materials with unique photophysical properties,have received increasing attention owing to their great theoretical significance and potential for biological *** much progress has been made in the design,synthesis and application of CL materials,there is still a big challenge in the emission *** far,throughspace interaction has been proposed as the preliminary mechanism of the corresponding clusterizationtriggered emission(CTE)effect,but a systematic theory is still *** review summarizes the current mechanistic understanding of CL materials including organic/inorganic small molecules,and polymers with/without isolated aromatic *** addition,some strategies to achieve high quantum yield,adjustable emission color,and persistent room temperature phosphorescence in CL materials are also *** last,a perspective of the mechanism and application of CL materials are demonstrated,which inspire the researchers working on the development of new kinds of functional materials.

关键词： Clusteroluminescence Clusterization-triggered emission Through-space interaction Non-conjugated structure

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Technology Roadmap for Flexible Sensors

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ACS NANO 2023年第6期17卷 5211-5295页

作者： Luo, Yifei Abidian, Mohammad Reza Ahn, Jong-Hyun Akinwande, Deji Andrews, Anne M. Antonietti, Markus Bao, Zhenan Berggren, Magnus Berkey, Christopher A. Bettinger, Christopher John Chen, Jun Chen, Peng Cheng, Wenlong Cheng, Xu Choi, Seon-Jin Chortos, Alex Dagdeviren, Canan Dauskardt, Reinhold H. Di, Chong-an Dickey, Michael D. Duan, Xiangfeng Facchetti, Antonio Fan, Zhiyong Fang, Yin Feng, Jianyou Feng, Xue Gao, Huajian Gao, Wei Gong, Xiwen Guo, Chuan Fei Guo, Xiaojun Hartel, Martin C. He, Zihan Ho, John S. Hu, Youfan Huang, Qiyao Huang, Yu Huo, Fengwei Hussain, Muhammad M. Javey, Ali Jeong, Unyong Jiang, Chen Jiang, Xingyu Kang, Jiheong Karnaushenko, Daniil Khademhosseini, Ali Kim, Dae-Hyeong Kim, Il-Doo Kireev, Dmitry Kong, Lingxuan Lee, Chengkuo Lee, Nae-Eung Lee, Pooi See Lee, Tae-Woo Li, Fengyu Li, Jinxing Liang, Cuiyuan Lim, Chwee Teck Lin, Yuanjing Lipomi, Darren J. Liu, Jia Liu, Kai Liu, Nan Liu, Ren Liu, Yuxin Liu, Yuxuan Liu, Zhiyuan Liu, Zhuangjian Loh, Xian Jun Lu, Nanshu Lv, Zhisheng Magdassi, Shlomo Malliaras, George G. Matsuhisa, Naoji Nathan, Arokia Niu, Simiao Pan, Jieming Pang, Changhyun Pei, Qibing Peng, Huisheng Qi, Dianpeng Ren, Huaying Rogers, John A. Rowe, Aaron Schmidt, Oliver G. Sekitani, Tsuyoshi Seo, Dae-Gyo Shen, Guozhen Sheng, Xing Shi, Qiongfeng Someya, Takao Song, Yanlin Stavrinidou, Eleni Su, Meng Sun, Xuemei Takei, Kuniharu Tao, Xiao-Ming Tee, Benjamin C. K. Thean, Aaron Voon-Yew Trung, Tran Quang Wan, Changjin Wang, Huiliang Wang, Joseph Wang, Ming Wang, Sihong Wang, Ting Wang, Zhong Lin Weiss, Paul S. Wen, Hanqi Xu, Sheng Xu, Tailin Yan, Hongping Yan, Xuzhou Yang, Hui Yang, Le Yang, Shuaijian Yin, Lan Yu, Cunjiang Yu, Guihua Yu, Jing Yu, Shu-Hong Yu, Xinge Zamburg, Evgeny Zhang, Haixia Zhang, Xiangyu Zhang, Xiaosheng Zhang, Xueji Zhang, Yihui Zhang, Yu Zhao, Siyuan Zhao, Xuanhe Zheng, Yuanjin Zheng, Yu-Qing Zheng, Zijian Zhou, Tao Zhu, Bowen Zhu, Ming Zhu, Rong Zhu, Yangzhi Zhu, Yong Zou, Guijin Chen, Xiaodong 08-03 Innovis Singapore 138634 Republic of Singapore Innovative Centre for Flexible Devices (iFLEX) School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore Department of Biomedical Engineering University of Houston Houston Texas 77024 United States School of Electrical and Electronic Engineering Yonsei University Seoul 03722 Republic of Korea Department of Electrical and Computer Engineering The University of Texas at Austin Austin Texas 78712 United States Microelectronics Research Center The University of Texas at Austin Austin Texas 78758 United States Department of Chemistry and Biochemistry California NanoSystems Institute and Department of Psychiatry and Biobehavioral Sciences Semel Institute for Neuroscience and Human Behavior and Hatos Center for Neuropharmacology University of California Los Angeles Los Angeles California 90095 United States Colloid Chemistry Department Max Planck Institute of Colloids and Interfaces 14476 Potsdam Germany Department of Chemical Engineering Stanford University Stanford California 94305 United States Laboratory of Organic Electronics Department of Science and Technology Campus Norrköping Linköping University 83 Linköping Sweden Wallenberg Initiative Materials Science for Sustainability (WISE) and Wallenberg Wood Science Center (WWSC) SE-100 44 Stockholm Sweden Department of Materials Science and Engineering Stanford University Stanford California 94301 United States Department of Biomedical Engineering and Department of Materials Science and Engineering Carnegie Mellon University Pittsburgh Pennsylvania 15213 United States Department of Bioengineering University of California Los Angeles Los Angeles California 90095 United States School of Chemistry Chemical Engineering and Biotechnology Nanyang Technological University Singapore 637457 Singapore Nanobionics Group Department of Chemical and Biological Engineering Monash University Clayton Australia 3800 Monash

Humans rely increasingly on sensors to address grand challenges and to improve quality of life in the era of digitalization and big data. For ubiquitous sensing, flexible sensors are developed to overcome the limitations of conventional rigid counterparts. Despite rapid advancement in bench-side research over the last decade, the market adoption of flexible sensors remains limited. To ease and to expedite their deployment, here, we identify bottlenecks hindering the maturation of flexible sensors and propose promising solutions. We first analyze continued...challenges in achieving satisfactory sensing performance for real-world applications and then summarize issues in compatible sensor-biology interfaces, followed by brief discussions on powering and connecting sensor networks. Issues en route to commercialization and for sustainable growth of the sector are also analyzed, highlighting environmental concerns and emphasizing nontechnical issues such as business, regulatory, and ethical considerations. Additionally, we look at future intelligent flexible sensors. In proposing a comprehensive roadmap, we hope to steer research efforts towards common goals and to guide coordinated development strategies from disparate communities. Through such collaborative

关键词： soft materials mechanics engineering flexible electronics conformable sensors bioelectronics human-machine interfaces body area sensor networks technology translation sustainable electronics

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Counterion effects on enhancing the electrochromic performance of poly(3,4-ethylenedioxythiophene) thin films

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Materials Letters 2024年 361卷

作者： Hu, Chih-Wei Kao, Chung-Min Ho, Kuo-Chuan Aichi Nagoya463-8560 Japan Institute of Polymer Science and Engineering National Taiwan University Taipei10617 Taiwan Department of Chemical Engineering National Taiwan University Taipei10617 Taiwan

In this study, poly(3,4-ethylenedioxythiophene) (PEDOT), an attractive conducting polymer, was paired up with several counterions, namely perchlorate (ClO4−), nitrate (NO3−), and chloride (Cl−), to improve its electrochromic (EC) properties. Electrochemical polymerization was used to prepare modified PEDOT thin films in aqueous solutions containing 3,4-ethylenedioxythiophene monomer and various counteranions. Among them, Cl−-doped PEDOT (PEDOT-Cl) thin films offered a remarkable EC performance. The PEDOT-Cl thin films prepared in aqueous solutions exhibited multicolor EC properties, unlike the PEDOT thin films prepared in common organic solvents. The PEDOT-Cl thin film achieved a transmittance change of around 30 % in the visible range. The switching times of the PEDOT-Cl thin film were found to be less than 5.0 s, both in bleaching and darkening, for an electroactive area of 4.0 cm2. Moreover, the remarkable electrochromic properties of the PEDOT-Cl thin film were analyzed using different methods. © 2024 Elsevier B.V.

关键词： Thin films

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Electrospinning:An emerging technology to construct polymer-based nanofibrous scaffolds for diabetic wound healing

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Frontiers of Materials science 2021年第1期15卷 10-35页

作者： Atta ur Rehman KHAN Yosry MORSI Tonghe ZHU Aftab AHMAD Xianrui XIE Fan YU Xiumei MO State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of ChemistryChemical Engineering and BiotechnologyDonghua UniversityShanghai 201620China Faculty of Engineering and Industrial Sciences Swinburne University of TechnologyBoroondaraVIC 3122Australia Multidisciplinary Center for Advanced Materials of Shanghai University of Engineering Science College of Chemistry and Chemical EngineeringShanghai University of Engineering ScienceShanghai 201620China Department of Bioscience cOMSATS Institute of Information TechnologyPakistan

A chronic wound in diabetic patients is a major public health concern withsocioeconomic and clinical *** underlying medical condition of diabeticpatients deteriorates the wound through physiological,metabolic,molecular,and ***,a wound enters a vicious pathological inflammatory *** therapeutic approaches are in practice to manage diabetic wounds hence ensuringthe regeneration ***-based biomaterials have come up with hightherapeutic *** efforts have been devoted,over the years,to build aneffective wound healing material using *** electrospinning technique,although not new,has turned out to be one of the most effective strategies in buildingwound healing biomaterials due to the special structural advantages of electrospunnanofibers over the other *** this review,careful integration of allelectrospinning approaches has been presented which will not only give an insight intothe current updates but also be helpful in the development of new therapeutic materialconsidering pathophysiological conditions of a diabetic wound.

关键词： diabetic wound healing inflammation polymers bioactive substances hydrogel electrospinning nanofibers

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Glycerol Electrooxidation over Precision-Synthesized Gold Nanocrystals with Different Surface Facets

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Precision Chemistry 2024年第3期2卷 103-111页

作者： Hansen Mou Fang Lu Zechao Zhuang Qiaowan Chang Lihua Zhang Xiaobo Chen Yugang Zhang Jingguang G.Chen Department of Chemical Engineering Columbia UniversityNew YorkNew York 10027United States School of Chemical Engineering and Bioengineering Washington State UniversityPullmanWashington 99164United States Center for Functional Nanomaterials Brookhaven National LaboratoryUptonNew York 11973United States Materials Science and Engineering Program State University of New York at BinghamtonBinghamtonNew York 13902United States Chemistry Division Brookhaven National LaboratoryUptonNew York 11973United States

Electrochemical glycerol oxidation(EGO)emerges as a promising route to valorize glycerol,an underutilized byproduct from biodiesel production,into value-added *** study employed three types of gold(Au)nanocrystals with controlled shapes to elucidate the facet-dependent electrocatalytic behavior in ***,rhombic dodecahedral,and cubic Au nanocrystals with{111},{110},and{100}facets,respectively,were precisely synthesized with uniform size and *** dodecahedra exhibited the lowest onset potential for EGO due to facile AuOH formation,while octahedra showed enhanced electrochemical activity for glycerol oxidation and resistance to ***-situ FTIR analysis revealed that Au{111}surfaces selectively favored C_(2) products,whereas Au{100}surfaces promoted C_(3) product formation,highlighting the significant effect of facet orientation on EGO performance and informing catalyst design.

关键词： Electrochemical glycerol oxidation Precision synthesis Shaped nanocrystals Au nanocrystals SAXS In-situ FTIR

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