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Crystal phase engineering on photocatalytic materials for energy and environmental applications

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Nano Research 2019年第9期12卷 2031-2054页

作者： Song Bai Chao Gao jingxiang low Yujie Xiong Key Laboratory of the Ministry of Education for Advanced Catalysis Materials College of Chemistry and Life SciencesInstitute of Physical and ChemistryZhejiang Normal UniversityJinhua 321004China Hefei National Laboratory far Physical Sciences at the Microscale iChEM (Collaborative Innovation Center of Chemistry for Energy Materials)School oj Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefei 230026China

Crystal phase engineering on photocatalytic materials is a subfield of photocatalysis with intensive research,which has been proven as a:versatile approach to maneuver their performance for applications in energy-and environment-related *** this article,the state-of-the-art progress on phase-e ngin eered photocatalytic materials is ***,we discuss the phase engin eeri ng on pristi ne semic on ductor photocatalysts,in which the phase-dependent light absorption,charge transfer and separation,and surface reaction behaviors in photocatalytic processes are summarized,*** on the elucidated mechanisms,the implementation of phase junctions in photocatalytic reactions is then *** a focus,we highlight the rational design of phase junctions toward steering the charge kinetics for enhanced photocatalytic and photoelectrocatalytic ***,the crystal phase engineering on semiconductor-based hybrid photocatalysts is also in troduced,which un derli nes the importa nee of choosi ng a suitable phase for semic on ductor comp orients and co-catalysts as well as the synergism of differe nt semico nductor phases for improved photocatalytic performa *** ally,the challe nges and perspectives in this research field are *** this review,particular emphasis is placed on establishing a linkage between crystal phase and photocatalytic activity to develop a structure-activity *** on the guide,a framework is suggested for future research on the rational phase design of photocatalysts for improved performance in energy and environmental applications.

关键词： photocatalysis crystal phase charge kinetics architectural design energy environment

MXene-based photocatalysts

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Journal of Materials Science & Technology 2020年第21期56卷 18-44页

作者： Panyong Kuang jingxiang low Bei Cheng Jiaguo Yu Jiajie Fan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan430070China Hefei National Laboratory for Physical Sciences at the Microscale Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)School of Chemistry and Materials Scienceand National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei230026China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

Transition metal carbide or nitride(MXene)is regarded as next-generation two-dimensional(2D)materials for various applications,such as photocatalysis,electrocatalysis,supercapacitor,lithium-ion battery and biomedicine,because of its unique physicochemical *** photocatalysis,MXene could allow fast photogenerated charge carrier separation and provide abundant surface functional groups for light harvesting materials,rendering feasible the high photoconversion ***,enormous theoretical and experimental studies have been recently made and shown the potential of MXene in various photocatalytic ***,we provide a brief overview of the MXene-based materials,along with their functions in photocatalytic ***,we summarize the recent advances and progresses of MXene-based photocatalysts,ranging from solar fuel production to pollutant ***,we present concluding remarks and the outlooks for achieving highly efficient MXene-based photocatalysts.

关键词： MXene Two-dimensional material Photocatalysis Ti3C2 Solar fuel production

New progress on MXenes-based nanocomposite photocatalysts

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Materials Reports(Energy) 2022年第1期2卷 62-87页

作者： Panyong Kuang Zhenrui Ni Jiaguo Yu jingxiang low Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan430074PR China Hefei National Laboratory for Physical Sciences at the Microscale Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)School of Chemistry and Materials ScienceAnd National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei230026PR China

Two-dimensional(2D)materials,especially transition metal carbides and/or nitrides(MXenes),have aroused extensive research interest in the field of ***,the unique properties of high electrical conductivity,abundant surface functional groups,considerable specific surface area,and excellent photo-thermal effect allow MXenes to play versatile roles in ***,the latest and encouraging developments in MXenes-based composite materials for photocatalytic applications in recent two years are *** first briefly describe the roles of MXenes as a support and co-catalyst to promote the distribution of photocatalysts and facilitate the separation of the photogenerated charge carriers,***,the design and fabrication of MXenes-based composite materials for various photocatalytic applications including H_(2) evolution,CO_(2) reduction,environmental remediation,and H_(2)O_(2) generation are comprehensively ***,we point out the challenges and prospects for the future development of MXenes-based composite materials.

关键词： Two-dimensional materials MXenes Photocatalytic applications H2 production CO_(2)reduction

Recent progress in electrochemical C–N coupling reactions

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eScience 2023年第1期3卷 26-37页

作者： Yuan Zhong Hailong Xiong jingxiang low Ran Long Yujie Xiong Hefei National Research Center for Physical Sciences at the Microscale School of Chemistry and Materials ScienceNational Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefeiAnhui 230026China Institute of Energy Hefei Comprehensive National Science Center350 ShushanhuRd.HefeiAnhui 230031China

Electrochemical C–N coupling has generated intense research interest as a promising approach to reduce carbon and nitrogen emissions and store excess renewable electricity in valuable chemicals(e.g.,urea,amides,and amines).In this review,we discuss the emerging trends in electrocatalytic C–N coupling reactions using CO_(2) and inorganic nitrogenous species(i.e.,dinitrogen(N_(2))),nitrate(NO_(2)^(-)),nitrite(NO_(3)^(-)),and ammonia(NH_(3))as raw *** related reaction mechanisms and potential design principles for advanced electrocatalysts are *** addition,the effects of different reactors,including H-cells,membrane-based flow reactors,and membrane electrode assembly electrolyzers,on the coupling reactions are ***,the current challenges and future opportunities in this field are *** aim to provide an up-to-date overview of the electrochemical C–N coupling system to advance progress toward its practical application.

关键词： Electrochemical C-N coupling reactions Carbon dioxide Inorganic nitrogenous species Nitrogenous compounds Reactor designs

Identification and Design of Active Sites on Photocatalysts for the Direct Artificial Carbon Cycle

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Accounts of Materials Research 2022年第3期3卷 331-342页

作者： jingxiang low Jun Ma Jun Wan Wenbin Jiang Yujie Xiong Hefei National Laboratory for Physical Sciences at the Microscale School of Chemistry and Materials ScienceUniversity of Science and Technology of ChinaHefeiAnhui 230026China Multidisciplinary Platform of Advanced Engineering Chemical Engineering DisciplineSchool of EngineeringMonash UniversityBandar Sunway 47500 SelangorMalaysia

CONSPECTUS:Imitating the natural carbon cycle,the utilization of the carbon-based greenhouse gases(i.e.,carbon dioxide(CO_(2))and methane(CH_(4)))from the atmosphere as the carbon feedstocks for valuable fuel and chemical production represents a prospective strategy for achieving the sustainable development of human *** light of this,photocatalytic CO_(2)/CH_(4)conversions,which can directly harvest solar energy for the production of valuable fuels and chemicals,show gigantic potential for closing the loop of the artificial carbon *** the past several decades,immense progress has been made in this field,showing its practical ***,the photocatalytic conversion efficiency and selectivity of such reactions remain *** that the photocatalytic reaction is intimately related to the surface catalytic reaction on the active sites of the photocatalysts,the active site design has been proven to be effective for optimizing photocatalytic performance,yet the lack of effective techniques for the identification of the active sites,which is normally at the molecular level,greatly limits its potential in ***,with the rapid expansion in the field of materials science,a large number of advanced characterization techniques have been developed,equipping the materials scientist and chemist with powerful tools for unveiling the mask of the active sites on the ***,the active site design for the photocatalysts has undergone a ***,the identification and design of active sites have emerged as hot topics in catalysis and are expected to push forward development in the field of the artificial carbon cycle.

关键词： dioxide catalysis Active

Cu_(2−x)S derived copper nanoparticles:A platform for unraveling the role of surface reconstruction in efficient electrocatalytic CO_(2)-to-C_(2)H_(4)conversion

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Nano Research 2023年第4期16卷 4494-4498页

作者： Chaohua He Delong Duan jingxiang low Yu Bai Yawen Jiang Xinyu Wang Shuangming Chen Ran Long Li Song Yujie Xiong Hefei National Laboratory for Physical Sciences at the Microscale Frontiers Science Center for Planetary Exploration and Emerging TechnologiesSchool of Chemistry and Materials Scienceand National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei 230026China Hefei Comprehensive National Science Center 350 Shushanhu Rd.Hefei 230031China

Cu-based electrocatalysts have provoked much attention for their high activity and selectivity in carbon dioxide(CO_(2))conversion into multi-carbon ***,during the electrochemical reaction,Cu catalysts inevitably undergo surface reconstruction whose impact on CO_(2)conversion performance remains *** we report that polycrystalline Cu nanoparticles(denoted as Cu-s)with rich high-index facets,derived from Cu_(2−x)S through desulphurization and surface reconstruction,offer an excellent platform for investigating the role of surface reconstruction in electrocatalytic CO_(2)*** the formation of Cu-s catalyst,the two stages of desulphurization and surface reconstruction can be clearly resolved by in situ X-ray absorption spectroscopy and OH−adsorption characterizations,which are well correlated with the changes in electrocatalytic *** turns out that the high CO_(2)conversion performance,achieved by the Cu-s catalyst(Faradic efficiency of 68.6%and partial current density of 40.8 mA/cm^(2)in H-cell toward C_(2)H_(4)production),is attributed to the increased percentage of high-index facets in Cu-s during the surface ***,the operando electrochemical Raman spectroscopy further reveals that the conversion of the CO_(2)into the C_(2)H_(4)on Cu-s is intermediated by the production of**** findings manifest that the surface reconstruction is an effective method for tuning the reaction intermediate of the CO_(2)conversion toward high-value multicarbon(C2+)chemicals,and highlight the significance of in situ characterizations in enhancing the understanding of the surface structure and its role in electrocatalysis.

关键词： CO_(2)electroreduction reaction surface reconstruction high-index facets ethylene(C_(2)H_(4)) Cu catalysts

Multilayer core-shell nanostructures for enhanced 808 nm responsive upconversion

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Chinese Chemical Letters 2022年第2期33卷 1087-1090页

作者： Yao Wang jingxiang low Yafei Bi Yu Bai Yawen Jiang Huihui Wang Weiyong Liu Yuqian Ma Yunuo Chen Ran Long Yujie Xiong Hefei National Laboratory for Physical Sciences at the Microscale Frontiers Science Center for Planetary Exploration and Emerging TechnologiesSchool of Chemistry and Materials ScienceNational Synchrotron Radiation LaboratoryNeurodegenerative Disorder Research CenterCAS Key Laboratory of Brain Function and Diseaseand School of Life SciencesUniversity of Science and Technology of ChinaHefei 230026China Department of Ultrasound The First Affiliated Hospital of USTCDivision of Life Sciences and MedicineUniversity of Science and Technology of ChinaHefei 230036China

The construction of core-shell structure is an effective strategy for promoting the emission efficiency of upconversion nanocrystals(UCNCs). In this work, the UCNCs based on Nd-doping with a multilayer coreshell nanostructure are fabricated toward achieving efficient upconversion for 808 nm excitation, which have great potential for optical applications, especially photobiological applications.

关键词： 808 nm excitation Upconversion nanocrystals Core-shell structure Structure construction Emission enhancement

TiO2形貌调控及其对光催化CO2还原活性的研究

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TiO2形貌调控及其对光催化CO2还原活性的研究

作者： low jingxiang 武汉理工大学

学位级别：硕士

With the rapid increasing of enormous challenges in energy demands and environmental pollution ignited by fossil fuels consumption, developing of renewable and green technologies for energy production has aroused widespread concern in the past few decades. Among various proposed technologies, semiconductor-based photocatalysis for CO2 reduction have been known as one of the most perspective strategies because of its potential in renewable energy creation and environmental remedies. In details, photocatalysis CO2 reduction can transform the green-house gas(CO2) into the valuable solar fuels such as CH4, HCO2 H, CH2 O and CH3 OH. This outstanding ability of the photocatalysis CO2 reduction is the main motivation for the searching of efficient and visible-light active photocatalyst. After years of research and development, many semiconductors have been assayed and explored to be used as an effective photocatalyst for photocatalysis CO2 reduction, such as Ti O2, Cd S, g-C3N4, Zn O and Bi2WO6. However, the practical application of photocatalysis CO2 reduction is still limited by its low CO2 conversion efficiency due to the fast charge carriers recombination and low light utilization. Among these semiconductors, Ti O2 has regarded as the most promising photocatalyst because of its low cost, environmentally friendliness and excellent photostability. However, Ti O2 owns low photoconversion efficiency even in the UV-region due to its large bandgap, less photocatalytic reaction site, low electron mobility and short minority carrier diffusion length. Several strategies have been carried out to improve the photoconversion efficiency of the Ti O2, such as extending the Ti O2 absorption to visible light, boosting electron and hole lifetimes through doping and loading metals, and increasing the surface area by building a porous *** tuning is an effective way to enhance the photocatalytic activity of the photocatalyst. Nowadays, there is an enormous interest in con

关键词： TiO2 CO2 reduction facets nanotube arrays photonic crystal

Working-in-tandem mechanism of multi-dopants in enhancing electrocatalytic nitrogen reduction reaction performance of carbon- based materials

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Nano Research 2021年第9期14卷 3234-3239页

作者： Wenqing Zhang Keke Mao jingxiang low Hengjie Liu Yanan Bo Jun Ma Qiaoxi Liu Yawen Jiang Jiuzhong Yang Yang Pan Zeming Qi Ran Long Li Song Yujie Xiong Hefei National Laboratory for Physical Sciences at the Microscale Collaborative Innovation Center of Chemistry for Energy Materials(iChEM)School of Chemistry and Materials Scienceand National Synchrotron Radiation LaboratoryUniversity of Science and Technology of ChinaHefei 230041China School of Energy and Environment Science Anhui University of TechnologyMaanshan 243032China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031China

Developing carbon-based electrocatalysts with excellent N2 adsorption and activation capability holds the key to achieve highly efficient nitrogen reduction reaction(NRR)for reaching its practical ***,we report a highly active electrocatalyst--metal-free pyrrolic-N dominated N,S co-doped carbon(pyrr-NSC)for *** on theoretical and experimental results,it is confirmed that the N and S-dopants practice a working-in-tandem mechanism on pyrr-NSC,where the N-dopants are utilized to create electropositive C sites for enhancing N2 adsorption and the S-dopants are employed to induce electron backdonation for facilitating N2 *** synergistic effect of the pyrrolic-N and S-dopants can also suppress the irritating hydrogen evolution reaction,further boosting the NRR *** work gives an indication that the combination of two different dopants on electrocatalyst can enhance NRR performance by working in the two tandem steps-the adsorption and activation of N2 molecules,providing a new strategy for NRR electrocatalyst design.

关键词： N2 reduction reaction metal-free catalyst heteroatoms doping asymmetric charge distribution electrocatalysis