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Modulation of Excitonic Confinement of TiO_(2)in Molten Salts for Overall CO_(2)Photoreduction

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Chinese Journal of Chemistry 2023年第10期41卷 1185-1190页

作者： Jing Wang Ren sheng Dong Gu Yuhao Peng Juanxiu Xiao yijun shen Wei Xiao College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China The Institute for Advanced Studies Wuhan UniversityWuhanHubei 430072China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikouHainan

Excitonic confinement greatly determines the charge carrier transport of photocatalysts.A molten salt modulation of excitonic con-finement is herein demonstrated as formation of ultrafine carbon-doped anatase TiO_(2)with grafted graphitic carbon nitride,which is rationalized as an excellent catalyst for overall CO_(2)*** with bulk TiO_(2),the carbon-doped TiO_(2)(M-TiO_(2))pos-sesses a weaker excitonic confinement to decrease exciton binding energy from 99 to 58 meV,consequently enhancing free-charge-carrier generation and *** Z-scheme electron transfer from M-TiO_(2)to C_(3)N_(4) is built,enhancing the CO_(2)conversion via the synchronous optimization of redox ability,CO_(2)activation,and^(*)COOH *** work highlights the unique chemistry of excitonic dissociation on facilitating separation of electron and hole,and also extends the scope of molten salt-mediated modulation of photocatalysis materials.

关键词： Molten salt CO_(2)reduction Photocatalysis Excitonic confinement Charge transfer

Isolated Co Atoms Anchored on Defective Nitrogen-doped Carbon Graphene as Efficient Oxygen Reduction Reaction Electrocatalysts

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Energy & Environmental Materials 2023年第3期6卷 144-149页

作者： Peng Rao Junming Luo Daoxiong Wu Jing Li Qi Chen Peilin Deng yijun shen Xinlong Tian State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228China

Oxygen reduction reaction(ORR)is the heart of many new energy conversions and storage devices,such as metal-air batteries and fuel ***,ORR is currently facing the dilemma of sluggish intrinsic kinetics and the noble electrocatalysts of high price and low *** this work,isolated Co atoms anchored on defective nitrogen-doped carbon graphene single-atom catalyst(Co-SAC/NC)are synthesized via the proposed movable type printing *** prepared Co-SAC/NC catalyst demonstrates admirable ORR performance,with a high half-wave potential of 0.884 V in alkaline electrolytes and outstanding *** addition,an assembled zinc–air battery with prepared Co-SAC/NC as air-cathode catalyst displays a high-peak power density of 179 mW cm^(-2)and a high-specific capacity(757 mAh g^(-1)).Density functional theory calculations confirm that the true active sites of the prepared catalyst are Co-N_(4)moieties,and further reveal a significantly electronic structure evolution of Co sites in the ORR process,in which the project density of states and local magnetic moment of Co atom varies during its whole reaction *** work not only paves a new avenue for synthesizing SACs as robust electrocatalysts,but also provides an electronic-level insight into the evolution of the electronic structure of single-atom catalysts.

关键词： movable type printing method oxygen reduction reaction single-atom catalyst zinc-air battery

Comparison Between Different Finite Element Analyses of Unbonded Flexible Pipe via Different Modeling Patterns

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Journal of Shanghai Jiaotong university(Science) 2019年第3期24卷 357-363页

作者： PANG Guoliang CHEN Chaohe shen yijun LIU Fuyong Naval Architecture and Ocean Engineering R&D Center of Guangdong Province South China University of Technology

Three kinds of models based on the same flexible pipe with 8 layers have been separately created to investigate the effects of different modeling approaches on numerical simulation results of finite element(FE)models for unbonded flexible *** the mechanical property of the unbonded flexible pipe under tension,torsion and bending load has been analyzed and compared via ABAQUS software on the basis of three created *** research shows that different modeling methods of flexible pipes make a great difference in the ***,modeling simplifications of the carcass and pressure armor have a great impact on the accuracy of the *** 3,in which the carcass is simulated by spiral isot ropic shell and other layers are Simula ted by solid element,possesses good adaptability,which has been proved by comparing the experiment data and other *** paper can offer a reference for the FE modeling methods,selection and mechanical property analysis of unbonded flexible pipe.

关键词： unbonded flexible pipe numerical simulation methods finite element(FE) analysis

Comprehensive Rehabilitation Therapy of Traditional Chinese Medicine Combined with Modern Rehabilitation Training Improves the Spasticity and Motor Function of Hemiplegia after Stroke

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Journal of Clinical and Nursing Research 2024年第3期8卷 82-88页

作者： yijun shen Central Health Center Sijia TownHaimen DistrictNantong 226100China

Objective:To analyze the impact of comprehensive rehabilitation therapy of traditional Chinese medicine(TCM)(based on modern rehabilitation training)on the spasticity and motor function in stroke patients with ***:Seventy-nine stroke and hemiplegia patients admitted to the hospital from June 2021 to June 2023 were selected and randomly divided into a control group(39 cases)using modern rehabilitation training,and an observation group combined with comprehensive TCM rehabilitation therapy(40 cases),over 1 *** clinical index data of the two groups were ***:There were differences in the clinical index data between the two *** total effective rate after 2 treatment in the observation group(92.50%)was higher than that of the control group(74.36%)(χ^(2)=4.727,P<0.05).All central sensitization inventory(CSI)and stroke quality of life(PRO)scores in both groups were lower after treatment,with the observation group having lower scores as compared to the control group(P<0.05).The scores of FMA(upper limbs,lower limbs),Barthel index scores,and Functional Ambulation Categories(FAC)scores of both groups increased after treatment,with the observation group having higher scores as compared to the control group(P<0.05).Conclusion:Comprehensive TCM rehabilitation therapy had a significant therapeutic effect on patients with hemiplegia after *** improved the patient’s spasticity,limb movement,and walking *** daily living abilities and quality of life were also enhanced.

关键词： Stroke Walking function Hemiplegia Comprehensive rehabilitation therapy of traditional chinese medicine Spasticity Modern rehabilitation therapy

Nitrogen-doped microporous graphite-enhanced copper plasmonic effect for solar evaporation

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Carbon Energy 2024年第3期6卷 215-223页

作者： Xintao Wu Chengcheng Li Ziqi Zhang Yang Cao Jieqiong Wang Xinlong Tian Zhongxin Liu yijun shen Mingxin Zhang Wei Huang School of Marine Science and Engineering School of Chemistry and Chemical EngineeringHainan UniversityHaikouHainanChina Key Laboratory of Child Cognition and Behavior Development of Hainan Province Qiongtai Normal UniversityHaikouHainanChina

Water scarcity is a global challenge,and solar evaporation technology offers a promising and eco-friendly solution for freshwater *** conversion materials(PCMs)are crucial for solar *** photothermal conversion efficiency and reducing water evaporation enthalpy are the two key strategies for the designing of *** desired PCMs that combine both of these properties remain a challenging task,even with the latest advancements in the ***,we developed copper nanoparticles(NPs)with different conjugated nitrogen-doped microporous carbon coatings(Cu@C–N)as *** microporous carbon enveloping layer provides a highly efficient pathway for water transport and a nanoconfined environment that protects Cu NPs and facilitates the evaporation of water clusters,reducing the enthalpy of water ***,the conjugated nitrogen nodes form strong metal-organic coordination bonds with the surface of copper NPs,acting as an energy bridge to achieve rapid energy transfer and provide high solar-to-vapor conversion *** Cu@C–N exhibited up to 89.4%solar-to-vapor conversion efficiency and an evaporation rate of 1.94 kgm^(−2) h^(−1) under one sun irradiation,outperforming conventional PCMs,including carbon-based materials and semiconductor *** findings offer an efficient design scheme for high-performance PCMs essential for solar evaporators to address global water scarcity.

关键词： nanoconfinement photothermal conversion materials plasmonic resonance seawater desalination solar evaporation

General approach for atomically dispersed precious metal catalysts toward hydrogen reaction

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Carbon Energy 2023年第7期5卷 100-111页

作者： Ruisong Li Daoxiong Wu Peng Rao Peilin Deng Jing Li Junming Luo Wei Huang Qi Chen Zhenye Kang yijun shen Xinlong Tian State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikouChina

As a carbon-free energy carrier,hydrogen has become the pivot for future clean energy,while efficient hydrogen production and combustion still require precious metal-based ***-atom catalysts(SACs)with high atomic utilization open up a desirable perspective for the scale applications of precious metals,but the general and facile preparation of various precious metal-based SACs remains ***,a general movable printing method has been developed to synthesize various precious metal-based SACs,such as Pd,Pt,Rh,Ir,and Ru,and the features of highly dispersed single atoms with nitrogen coordination have been identified by comprehensive *** importantly,the synthesized Pt-and Ru-based SACs exhibit much higher activities than their corresponding nanoparticle counterparts for hydrogen oxidation reaction and hydrogen evolution reaction(HER).In addition,the Pd-based SAC delivers an excellent activity for photocatalytic hydrogen *** for the superior mass activity of Ru-based SACs toward HER,density functional theory calculations confirmed that the adsorption of the hydrogen atom has a significant effect on the spin state and electronic structure of the catalysts.

关键词： hydrogen evolution reaction hydrogen oxidation reaction photocatalytic hydrogen evolution reaction precious metals single-atom catalysts

Electronic modulation of two-dimensional bismuth-based nanosheets for electrocatalytic CO_(2) reduction to formate: A review

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Materials Reports(Energy) 2023年第1期3卷 51-64,I0002页

作者： Guan Wang Fangyuan Wang Peilin Deng Jing Li Chongtai Wang Yingjie Hua yijun shen Xinlong Tian State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou570228China Key Laboratory of Electrochemical Energy Storage and Energy Conversion of Hainan Province School of Chemistry and Chemical EngineeringHainan Normal UniversityHaikou571158China

Electrocatalytic CO_(2) reduction reaction(eCO_(2) RR)has significant relevance to settle the global energy crisis and abnormal climate problem via mitigating the excess emission of waste CO_(2) and producing high-value-added ***,eCO_(2) RR to formic acid or formate is one of the most technologically and economically viable approaches to realize high-efficiency CO_(2) utilization,and the development of efficient electrocatalysts is very urgent to achieve efficient and stable catalytic *** this review,the recent advances for two-dimensional bismuth-based nanosheets(2D Bi-based NSs)electrocatalysts are concluded from both theoretical and experimental ***,the preparation strategies of 2D Bi-based NSs in aspects to precisely control the thickness and uniformity are *** addition,the electronic regulation strategies of 2D Bi-based NSs are highlighted to gain insight into the effects of the structure-property relationship on facilitating CO_(2) activation,improving product selectivity,and optimizing carrier transport ***,the considerable challenges and opportunities of 2D Bi-based NSs are discussed to lighten new directions for future research of eCO_(2) RR.

关键词： CO_(2) electroreduction Two-dimensional structure Bismuth-based catalysts Preparation strategy Electronic structure regulation Formate

Rational design ternary platinum based electrocatalysts for effective methanol oxidation reaction

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Journal of Energy Chemistry 2022年第7期31卷 230-235,I0007页

作者： Hao Tian Daoxiong Wu Jing Li Junming Luo Chunman Jia Zhongxin Liu Wei Huang Qi Chen Chong Michael Shim Peilin Deng yijun shen Xinlong Tian State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikou 570228HainanChina

Exploring effective, durable, and affordable electrocatalysts of methanol oxidation reaction(MOR) is of vital significance for the industrial application of direct methanol fuel cells. Herein, an efficient, general,and expandable method is developed to synthesis two-dimensional(2D) ternary Pt Bi M nanoplates(NPLs), in which various M(Co, Ni, Cu, Zn, Sn) is severed as the third component to the binary Pt Bi system. The MOR performance of Pt Bi M NPLs is entirely investigated, demonstrating that both the MOR activity and durability is enhanced with the introduction of the additional composition. Pt3Bi3Zn NPLs shows much higher MOR activity and stability than that of the Pt Bi counterparts, not to mention the current advanced Pt Ru/C and Pt/C catalysts. The prominent performances are attributed to the modulated electronic structure of the surface Pt in Pt Bi NPLs by the addition of Zn, resulting in a weakened affination between Pt and the adsorbed poisoning species(mainly CO) compared with Pt Bi NPLs, verified by density functional theory(DFT) calculations. In addition, the absorbed OH can be generated on the surface of Zn atom due to its favorable water activation properties, thus the CO removal on the adjacent Pt atoms is accelerated, further leading to a high activity and anti-poisoning performance of the resulting Pt_(3)Bi_(3)Zn catalyst. This work provides new insights and robust strategy for highly efficient MOR electrocatalyst with extraordinary anti-poisoning performance and stability.

关键词： Fuel cells Ternary nanoplates Durability Methanol oxidation reaction Anti-poisoning

One-dimensional PtFe hollow nanochains for the efficient oxygen reduction reaction

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Carbon Energy 2022年第6期4卷 1003-1010页

作者： Peng Rao Junming Luo Jing Li Wei Huang Wei Sun Qi Chen Chunman Jia Zhongxin Liu Peilin Deng yijun shen Xinlong Tian State Key Laboratory of Marine Resource Utilization in South China Sea Hainan Provincial Key Lab of Fine ChemistrySchool of Chemical Engineering and TechnologyHainan UniversityHaikouChina

Integration of electronic and strain effects with tailored structures is significant to tuning the electrocatalytic activity and stability of the electrocatalysts for the oxygen reduction reaction(ORR).In this study,onedimensional PtFe hollow nanochains are synthesized by a facile and effective method,which exhibit a highly open and porous *** modulated electronic and strain effects of Pt atoms are verified by extensive structural characterizations,and the mass and specific activities of the prepared catalyst are roughly 7.45 and 12.44 times higher than those of the commercial Pt/C catalyst,***,the catalyst demonstrates robust performance with negligible activity decay after an accelerated durability test for 30,000 *** high activity of the catalyst is probably due to the optimized absorption affinity of Pt-O accelerating the reaction kinetics induced by the cooperation of Fe atoms as well as the unique hollow and curved *** study provides new insights into the rational design of high-performance ORR catalysts with considerable durability.

关键词： electrocatalysts hollow nanochains one-dimensional oxygen reduction reaction zinc-air battery