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MoP nanoparticles with a P-rich outermost atomic layer embedded in N-doped porous carbon nanofibers： Self-supported electrodes for efficient hydrogen generation

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Nano Research 2018年第9期11卷 4728-4734页

作者： Minqiang Wang Cui Ye maowen xu Shujuan Bao Institute for Clean Energy & Advanced Materials Faculty of Materials and Energy Southwest University Chongqing 400715 China Key Laboratory of Eco-Environments in Three Gorges Reservoir Region (Ministry of Education) School of Chemistry and Chemical Engineering Southwest University Chongqing 400715 China

Despite being pursued for a long time, hydrogen production via water splitting is still a huge challenge mainly due to a lack of durable and efficient catalysts. Molybdenum phosphide （MOP） is theoretically capable of efficient hydrogen evolution reaction （HER） catalysis, however, there is still room for further improvement in its performance. Herein, we propose a design for MoP with a P-rich outermost atomic layer for enhancing HER via complementary theoretical and experimental validation. The correlation of computational results suggests that the P-terminated surface of MoP plays a crucial role in determining its high-efficiency catalytic properties. We fabricated a P-rich outermost atomic layer of MoP nanoparticles by using N-doped porous carbon （MoP@NPCNFs） to capture more P on the surface of MoP and limit the growth of nanoparticles. Further, the as-prepared material can be directly employed as a self-supported electrocatalyst, and it exhibits remarkable electrocatalytic activity for HER in acidic media; it also reveals excellent long-term durability for up to 5,000 cycles with negligible loss of catalytic activity.

关键词： P-rich outermost atomiclayer molybdenum phosphide density function theor^self-supported electrocatalyst hydrogen evolution reaction

Editorial for a special issue on:(Photo)electrochemical materials and devices

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Nano Materials Science 2023年第2期5卷 117-118页

作者： maowen xu Yuxin Zhang Lili Zhang Institute for Clean Energy&Advanced Materials School of Materials and EnergySouthwest UniversityChongqing400715PR China College of Materials Science and Engineering Chongqing UniversityChongqing400044PR China Catalysis&Green Process Engineering Institute of Sustainability for ChemicalsEnergy and Environment627833Singapore

With the development of human society and the depletion of non-renewable energy sources,alternate energy resources are becoming an urgent *** recent years,energy storage and conversion devices have drawn wide attentio... 详细信息

关键词： becoming depletion urgent

Effects of Catalysis and Separator Functionalization on High-Energy Lithium–Sulfur Batteries:A Complete Review

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Energy & Environmental Materials 2023年第3期6卷 333-355页

作者： Muhammad Kashif Aslam Sidra Jamil Shahid Hussain maowen xu Key Laboratory of Luminescence Analysis and Molecular Sensing(Southwest University) Ministry of EducationSchool of Materials and EnergySouthwest UniversityChongqing 400715China School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China

Lithium–sulfur(Li-S)batteries have the advantages of high theoretical specific capacity(1675 mAh g^(−1)),rich sulfur resources,low production cost,and friendly environment,which makes it one of the most promising next-generation rechargeable energy storage ***,the“shuttle effect”of polysulfide results in the passivation of metal lithium anode,the decrease of battery capacity and coulombic efficiency,and the deterioration of cycle *** realize the commercialization of Li-S batteries,its serious“shuttle effect”needs to be *** commercial separators are ineffective to suppress this effect because of its large pore ***,it is an effective strategy to modify the separator surface and introduce functional modified *** addition to the blocking strategy,the catalysis of polysulfide conversion reaction is also an important factor hindering the migration of *** this review,the principles of separator modification,functionalization,and catalysis in Li-S batteries are ***,the research trend of separator functionalization and polysulfide catalysis in the future is prospected.

关键词： catalysis Li-S batteries polysulfides separator functionalization shuttle effect

Metal-Organic Framework Enabling Poly(Vinylidene Fluoride)-Based Polymer Electrolyte for Dendrite-Free and Long-Lifespan Sodium Metal Batteries

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Energy & Environmental Materials 2024年第1期7卷 68-76页

作者： Yusi Lei Liang Yue Yuruo Qi Yubin Niu Shujuan Bao Jie Song maowen xu Faculty of Materials and Energy Institute for Clean Energy&Advanced MaterialsSouthwest UniversityChongqing 400715China Shandong Zero-One-Four Advanced Materials Co. Ltd.Feicheng 271099China

Sodium dentrite formed by uneven plating/stripping can reduce the utilization of active sodium with poor cyclic stability and,more importantly,cause internal short circuit and lead to thermal runaway and ***,sodium dendrites and their related problems seriously hinder the practical application of sodium metal batteries(SMBs).Herein,a design concept for the incorporation of metal-organic framework(MOF)in polymer matrix(polyvinylidene fluoride-hexafluoropropylene)is practiced to prepare a novel gel polymer electrolyte(PH@MOF polymer-based electrolyte[GPE])and thus to achieve high-performance *** addition of the MOF particles can not only reduce the movement hindrance of polymer chains to promote the transfer of Na^(+)but also anchor anions by virtue of their negative charge to reduce polarization during electrochemical reaction.A stable cycling performance with tiny overpotential for over 800 h at a current density of 5 mA cm^(-2)with areal capacity of 5 mA h cm^(-2)is achieved by symmetric cells based on the resulted GPE while the Na_(3)V_(2)O_(2)(PO_(4))_(2)F@rGO(NVOPF)|PH@MOF|Nacell also displays impressive specific cycling capacity(113.3 mA h g^(-1)at 1 C)and rate capability with considerable capacity retention.

关键词： dendrite-free gel polymer electrolyte metal organic framework sodium batteries

A high-durability aqueous Cu-S battery assisted by pre-copper electrochemistry

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Nano Research 2023年第7期16卷 9553-9560页

作者： Jing Zhao Yuruo Qi Tian Huang Yi Zhang Peipei Zhi Shujuan Bao maowen xu School of Materials and Energy Southwest UniversityChongqing 400715China Chongqing Key Lab for Advanced Materials and Clean Energies of Technologies Southwest UniversityChongqing 400715China Chongqing Municipal Engineering Research Center of Institutions of Higher Education for Special Welding Materials and Technology Chongqing University of technologyChongqing 400054China

Although research interest in aqueous metal-sulfur batteries(AMSs)has surged due to their intrinsic low cost and high capacity,the practical application of AMSs remains a considerable challenge because of the restrictive cycling *** circumvent this issue,we propose an innovative and simple pre-copper strategy to realize a high-durability aqueous Cu-S *** precopper strategy can effectively promote a stable metal dissolution/deposition,compensate for charge carriers,and facilitate reaction kinetics during the subsequent *** a result,the aqueous Cu-S battery when coupled with S-decorated porous Ti_(3)C_(2)(S-d-Ti_(3)C_(2))exhibits excellent electrochemical performance,delivering a highly reversible capacity of 1805.4 mAh·g^(-1)in the initial cycle at 0.8 A·g^(-1),impressive cycling stability with 90.2%capacity retention over 800 cycles,and ultralow polarization~0.08 V even at a high current density of 3.1 A·g^(-1).The findings obtained in this work could pave the way for the design of highperformance sulfur-based aqueous batteries,which fill the vacancy of the necessary metal anode,delivering merits in both cost and cycle life.

关键词： aqueous metal-sulfur batteries pre-copper treatment irreversible capacity loss electrochemical performance

Minimizing Carbon Content with Three-in-One Functionalized Nano Conductive Ceramics:Toward More Practical and Safer S Cathodes of Li-S Cells

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Energy & Environmental Materials 2023年第3期6卷 31-39页

作者： Ning Li Chang Sun Jianhui Zhu Shun Li Yanlong Wang maowen xu Changming Li Jian Jiang School of Materials and Energy and Chongqing Key Lab for Advanced Materials and Clean Energies of TechnologiesSouthwest UniversityChongqing 400715China School of Physical Science and Technology Southwest UniversityChongqing 400715China Key Laboratory of Chemical Lasers Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China College of Chemistry and Chemical Engineering Key Laboratory of Laser Technology and Optoelectronic Functional Materials of Hainan Provinceand Key Laboratory of Functional Materials and Photoelectrochemistry of HaikouHainan Normal UniversityHaikou 571158China

Using porous carbon hosts in cathodes of Li-S cells can disperse S actives and offset their poor electrical ***,such reservoirs would in turn absorb excess electrolyte solvents to S-unfilled regions,causing the electrolyte overconsumption,specific energy decline,and even safety hazards for battery *** build better cathodes,we propose to substitute carbons by In-doped SnO_(2)(ITO)nano ceramics that own three-in-one functionalities:1)using conductive ITO enables minimizing the total carbon content to an extremely low mass ratio(~3%)in cathodes,elevating the electrode tap density and averting the electrolyte overuse;2)polar ITO nanoclusters can serve as robust anchors toward Li polysulfide(LiPS)by electrostatic adsorption or chemical bond interactions;3)they offer catalysis centers for liquid–solid phase conversions of S-based ***,such ceramics are intrinsically nonflammable,preventing S cathodes away from thermal runaway or *** merits entail our configured cathodes with high tap density(1.54 g cm^(−3)),less electrolyte usage,good security for flame retardance,and decent Li-storage *** lean and LiNO_(3)-free electrolyte,packed full cells exhibit excellent redox kinetics,suppressed LiPS shuttling,and excellent *** may trigger great research enthusiasm in rational design of low-carbon and safer S cathodes.

关键词： flame retardance Li-S cells minimized carbon ratio nano conductive ceramics three-in-one functionality

Novel N-doped carbon nanotubes impregnated Mn spheres with polydopamine coating as an efficient polysulfide immobilizer for Li-S batteries

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Materials Reports(Energy) 2024年第4期4卷 31-39,I0001页

作者： Han Wang Sidra Jamil Muhammad Fasehullah Shujuan Bao Yi Li maowen xu Chongqing Key Laboratory of Battery Materials and Technology School of Materials and EnergySouthwest UniversityChongqing400715China Department of Chemistry Imperial College LondonMolecular Sciences Research HubWhite City Campus82 Wood LaneW120BZUK State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing UniversityChongqing400044China Institute of Condensed Matter and Nanosciences Molecular ChemistryMaterials and CatalysisUniversite Catholique de LouvainLouvain-la-NeuveB-1348Belgium

Lithium-sulfur(Li-S)batteries are one of the most promising energy storage and conversion devices due to the high theoretical capacity and cost-effectiveness of ***,they still suffer from sluggish redox kinetics and the shuttle effect caused by complex *** this work,graphitic carbon nitride(g-C_(3)N_(4))is utilized as a template and further hydrothermally treated with an Mn source and *** pyrolysis of g-C_(3)N_(4)gives rise to N-doped carbon nanotubes,producing abundant sites for physical confinement and chemical adsorption of polysulfides,while glucose carbonization brings forth amorphous carbon and Mn source produces metal ***,polydopamine(PDA)induces N-doped carbon coating and promotes interface connection as well as electron *** synergistic design possesses a high surface area of micropores and mesopores to aggregate sulfur and accelerate redox *** a result,the N-doped carbon nanotube with Mn spheres and PDA coating@sulfur(CN/Mn-PDA@S)exhibits a high reversible capacity of 813.5 mAh g^(-1)at 1 C with a decay rate of 0.064%per cycle and remarkable capacity retention at 2 C with rate performance up to 4 ***,the novel design of N-doped carbon nanotubes with Mn spheres and PDA coating serves as an efficient polysulfide immobilizer for Li-S batteries.

关键词： Li-S batteries G-C_(3)N_(4) PDA N-doped Mn spheres

Curtailing Carbon Usage with Addition of Functionalized NiFe2O4 Quantum Dots:Toward More Practical S Cathodes for Li-S Cells

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Nano-Micro Letters 2020年第11期12卷 1-12页

作者： Ning Li Ting Meng Lai Ma Han Zhang JiaJia Yao maowen xu Chang Ming Li Jian Jiang School of Materials and Energy and Chongqing Key Lab for Advanced Materials and Clean Energies of TechnologiesSouthwest UniversityNo.2 Tiansheng RoadBeiBei DistrictChongqing 400715People’s Republic of China School of Physical Science and Technology Southwest UniversityNo.2 Tiansheng RoadBeiBei DistrictChongqing 400715People’s Republic of China

Smartcombination of manifold carbonaceous materials with admirable functionalities(like full of pores/functional groups,high specific surface area) is still a mainstream/preferential way to address knotty issues of polysulfides dissolution/shuttling and poor electrical conductivity for S-based ***,extensive use of conductive carbon fillers in cell designs/technology would induce electrolytic overconsumption and thereby shelve high-energy-density promise of Li-S *** cut down carbon usage,we propose the incorporation of multi-functionalized NiFe2O4 quantum dots(QDs) as affordable additive *** total carbon content can be greatly curtailed from 26%(in traditional S/C cathodes) to a low/commercial mass ratio(~5%).Particularly,note that NiFe2O4 QDs additives own superb chemisorption interactions with soluble Li2Sn molecules and proper catalytic features facilitating polysulfide phase conversions and can also strengthen charge-transfer capability/redox kinetics of overall cathode *** from these intrinsic properties,such hybrid cathodes demonstrate prominent rate behaviors(decent capacity retention with ~526 mAh g^-1 even at 5 A g^-1) and stable cyclic performance in LiNO3-free electrolytes(only ~0.08% capacity decay per cycle in 500 cycles at 0.2 A g^-1).This work may arouse tremendous research interest in seeking other alternative QDs and offer an economical/more applicable methodology to construct low-carbon-content electrodes for practical usage.

关键词： Carbon usage reduction NiFe_2O_4 quantum dots Additive substitute Practical S cathode Li-S cells

Nano-Ni-Induced Electronic Modulation of MoS_(2) Nanosheets Enables Energy-Saving H_(2) Production and Sulfide Degradation

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Energy & Environmental Materials 2024年第3期7卷 228-235页

作者： Fan Liu Xinghong Cai Yang Tang Wenqian Liu Qianwei Chen Peixin Dong maowen xu Yangyang Tan Shujuan Bao Institute for Clean Energy&Advanced Materials School of Materials and EnergySouthwest UniversityChongqing 400715China

Electrocatalytic hydrogen evolution and sulfion(S^(2-))recycling are promising strategies for boosting H_(2)production and removing environmental ***,a nano-Ni-functionalized molybdenum disulfide(MoS_(2))nanosheet was assembled on steel mesh(Ni-MoS_(2)/SM)for use in sulfide oxidation reaction-assisted,energy-saving H_(2)*** and theoretical calculation results revealed that anchoring nano-Ni on high-surface-area slack MoS_(2)nanosheets not only optimized catalyst adsorption of polysulfides but also played an important role in promoting hydrogen evolution reaction kinetics by absorbing OH_(ad),thereby greatly enhancing the catalytic performance toward sulfide oxidation reaction and hydrogen evolution ***,the Ni/MoS^(2-)based hydrogen evolution reaction+sulfide oxidation reaction system achieved nearly 100%hydrogen production efficiency and only consumed 61%less power per kWh than the oxygen evolution reaction+hydrogen evolution reaction system,which suggested our proposed Ni-MoS_(2)and novel hydrogen production system are promising for sustainable energy production.

关键词： hydrogen evolution reaction low energy consumption molybdenum disulfide sulfide oxidation reaction