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Interfacial co-existence of oxygen and titanium vacancies in nanostructured TiO2 for enhancement of carrier transport

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Nanoscale 2020年第15期12卷 8364-8370页

作者： Yi Lu Yi-Xuan Liu Li He Li-Ying Wang Xiao-Long Liu Jia-Wen Liu Yuan-Zhou Li Ge Tian Heng Zhao Xiao-Hang Yang Jie Liu Christoph Janiak Silvia Lenaerts Xiao-Yu Yang Bao-Lian Su State Key Laboratory of Advanced Technology for Materials Synthesis and Processing & School of materials science and engineering Wuhan University of Technology Wuhan 430070 China. xyyang@***.

The interfacial co-existence of oxygen and metal vacancies in metal oxide semiconductors and their highly efficient carrier transport have rarely been reported. This work reports on the co-existence of oxygen and titanium vacancies at the interface between TiO and rGO via a simple two-step calcination treatment. Experimental measurements show that the oxygen and titanium vacancies are formed under 550 °C/Ar and 350 °C/air calcination conditions, respectively. These oxygen and titanium vacancies significantly enhance the transport of interfacial carriers, and thus greatly improve the photocurrent performances, the apparent quantum yield, and photocatalysis such as photocatalytic H production from water-splitting, photocatalytic CO reduction and photo-electrochemical anticorrosion of metals. A new "interfacial co-existence of oxygen and titanium vacancies" phenomenon, and its characteristics and mechanism are proposed at the atomic-/nanoscale to clarify the generation of oxygen and titanium vacancies as well as the interfacial carrier transport.

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Holey platinum nanotubes for ethanol electrochemical reforming in aqueous solution

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Science Bulletin 2021年第20期66卷 2079-2089,M0003页

作者： Tian-Jiao Wang Hui-Ying Sun Qi Xue Ming-Jun Zhong Fu-Min Li Xinlong Tian Pei Chen Shi-Bin Yin Yu Chen Key Laboratory of Macromolecular Science of Shaanxi Province Key Laboratory of Applied Surface and Colloid Chemistry(Ministry of Education)Shaanxi Key Laboratory for Advanced Energy DevicesSchool of Materials Science and EngineeringShaanxi Normal UniversityXi'an 710062China 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 MOE Key Laboratory of New Processing Technology for Non-ferrous Metals and Materials Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsGuangxi UniversityNanning 530004China

The catalytic/electrocatalytic performance of platinum(Pt)nanostructures highly relates to their ***,we propose a facile self-template pyrolysis strategy at high temperature to synthesize one-dimensionally holey Pt nanotubes(Pt-hNTs)using Pt^(Ⅱ)-dimethylglyoxime complex(Pt^(Ⅱ)-DMG)nanorods as the reaction *** coordination capability of DMG results in the generation of Pt^(Ⅱ)-DMG nanorods,whereas the reducibility of DMG at high temperature leads to the reduction of Pt^(Ⅱ)species in Pt^(Ⅱ)-DMG *** the reaction process,the inside-out Ostwald ripening phenomenon leads to the hollow morphology of *** from the physical characteristics of hollow and holey structure,Pt-hNTs with clean surface show superior electroactivity and durability for catalyzing ethanol electrooxidation as well as hydrogen evolution reaction in alkaline *** optimized experimental conditions,the constructed symmetric Pt-hNTs||Pt-hNTs ethanol electrolyzer only requires an electrolysis voltage of 0.40 V to achieve the electrochemical hydrogen production,demonstrating a highly energy saving strategy relative to traditional water electrolysis.

关键词： Holey platinum nanotubes High temperature pyrolysis Ethanol electrochemical reforming Ethanol oxidation reaction Hydrogen production

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In situ synthesis of oriented Zn-Mn-Co-telluride on precursor free CuO: An experimental and theoretical study of hybrid electrode paradigm for advanced supercapacitors

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Nano materials Science 2024年

作者： Ahmad, Muhammad Nawaz, Tehseen Hussain, Iftikhar Chen, Xi Khan, Shahid Ali Eddahani, Yassine Abraham, B. Moses Ali, Shafqat Wang, Ci Zhang, Kaili Department of Mechanical Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Hong Kong A.J. Drexel Nanomaterials Institute and Department of Materials Science and Engineering Drexel University 3141 Chestnut Street PhiladelphiaPA19104 United States Department of Chemistry The University of Hong Kong Hong Kong Department of Chemical Engineering Indian Institute of Technology Kanpur Kanpur208016 India State Key Laboratory of New Textile Materials and Advanced Processing Technologies National Local Joint Laboratory for Advanced Textile Processing and Clean Production Wuhan Textile University Wuhan430200 China Key Lab of In-fiber Integrated Optics Ministry Education of China Harbin Engineering University Harbin150001 China

The evolution of energy storage technology has seen remarkable progress, with a shift from pure metals to sophisticated, tailor-made active materials. The synthesis of nanostructures with exceptional properties is crucial in the advancement of electrode materials. In this regard, our study highlights the fabrication of a novel, oriented heterostructure comprised of Zn-Mn-Co-telluride grown on a pre-oxidized copper mesh using a hydrothermal method followed by a solvothermal process. This innovative approach leads to the formation of the Zn-Mn-Co-telluride@CuO@Cu heterostructure, which demonstrates the unique oriented morphology. It outperforms both Zn-Mn-Co-telluride@Cu and CuO@Cu by exhibiting lower electrical resistivity, increased redox activity, higher specific capacity, and improved ion diffusion characteristics. The conductivity enhancements of the heterostructure are corroborated by density functional theory (DFT) calculations. When utilized in a hybrid supercapacitor (HSC) alongside activated carbon (AC) electrodes, the Zn-Mn-Co-telluride@CuO@Cu heterostructure-based HSC achieves an energy density of 75.7 Wh kg−1. Such findings underscore the potential of these novel electrode materials to significantly impact the design of next-generation supercapacitor devices. © 2024 Chongqing University

关键词： Electrodes

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Microwave plasma etching of SS304 substrates for improved PVD coating adhesion

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Applied Surface Science 2025年 708卷

作者： Liu, Wenxin Xu, Zhigang Peng, Jian Wang, Chuanbin Chaozhou Branch of Chemistry and Chemical Engineering Guangdong Laboratory Chaozhou521000 China Hubei Technology Innovation Center for Advanced Composites Wuhan University of Technology Hubei Wuhan430070 China State Key Lab of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Fabricating microstructures on a substrate surface enhances surface roughness, improving the adhesion of physical vapor deposition (PVD) coatings. Currently, plasma etching is widely used to improve substrate surface roughness. However, it suffers from limitations such as low etching efficiency and substrate damage. This study explores microwave plasma etching as an innovative approach to enhance surface roughness, combined with magnetron sputtering to improve coating adhesion. The effects of etching time on substrate morphology, roughness, and wettability are systematically analyzed, along with their influence on chromium (Cr) coating properties. Results show that microwave plasma etching increases surface roughness and wettability without altering the substrate's phase structure. The crystallographic orientation of Cr coatings is less affected by the substrate surface roughness. Indentation and scratch tests are conducted to evaluate the adhesion strength under dynamic and static conditions. When the etching time is 2 h and the substrate surface roughness is 10.5 nm, the adhesion strength between the coating and the substrate reaches a maximum of 42.7 N, which is nearly a 100 % improvement compared to the adhesion strength of the polished substrate. This study demonstrates an effective method for improving substrate roughness and provides insights into enhancing the coating adhesion. © 2025 Elsevier B.V.

关键词： Surface roughness

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Hypervalent Potassium Xanthate Modified Sno2 for Highly Efficient Perovskite Solar Modules

SSRN

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SSRN 2022年

作者： Lu, Jianfeng Lv, Pin Yang, Yufei Li, Neng Zhang, Yuxi Hu, Min Huang, Bo Zhu, Yanqing Li, Bin Pan, Junye Wang, Shifeng Huang, Fuzhi Cheng, Yi-Bing State Key Laboratory of Silicate Materials for Architectures Wuhan University of Technology Wuhan430070 China School of Electronic and Electrical Engineering Hubei Province Engineering Research Center for Intelligent Micro-Nano Medical Equipment and Key Technologies Wuhan Textile University Wuhan430200 China Foshan Xianhu Laboratory The Advanced Energy Science and Technology Guangdong Laboratory Foshan528216 China Innovation Laboratory of Materials for Energy and Environment Technologies Institute of Oxygen Supply Tibet University Lhasa850000 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan430070 China

Tin oxide (SnO2) has been demonstrated as a promising electron transport material for high efficiency perovskite solar cells (PSCs) that made entirely via solution processing at low temperature (2|perovskite lead to a large voltage loss and performance variation. Herein, we present a facile and effective method to simultaneously reduce the interfacial defects and enhance the charge transfer via modification of SnO2 by hypervalent potassium xanthate. The presence of Lewis acidic centers of the sulfur ligands, gives rise to a strong hypervalent interactions with both Pb2+ on the perovskite and Sn4+ on the SnO2 surface, which accelerates the interfacial charge transfer and suppresses the recombination reaction. As a result, solar cells with a power conversion efficiency of 23.4% with negligible hysteresis are fabricated in light of significantly increased voltage in comparison with the relevant controls. Moreover, a stabilized efficiency of 18.8% for large-area (active area: 48.0 cm2) perovskite solar modules is achieved. The modules retain 90% of their initial performance after aging at ambient for 600 hours, which is substantially improved in comparison with the modules based on pristine SnO2 © 2022, The Authors. All rights reserved.

关键词： Perovskite solar cells

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Construction of Cos-Encapsulated in Ultrahigh Nitrogen Doped Carbon Nanofibers from Energetic Metal-Organic Frameworks for Superior Sodium Storage

SSRN

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SSRN 2022年

作者： Wu, Yingxiao Cheng, Jinqian Liang, Zibin Qiu, Tianjie Tang, Yanqun Shi, Jinming Gao, Song Zhong, Ruiqin Zou, Ruqiang Beijing Key Lab of Theory and Technology for Advanced Battery Materials School of Materials Science and Engineering Peking University Beijing100871 China State Key Laboratory of Heavy Oil Processing China University of Petroleum Beijing102249 China Institute of Clean Energy Peking University Beijing100871 China

Metal-organic frameworks (MOFs) derived carbon nanomaterials are arising as promising anode materials for sodium-ion batteries. However, the heteroatoms loss and aggregation during pyrolysis significantly hamper its further application. Herein, we utilized electrospinning structuring energetic MOF into nanofibers, followed by one-step sulfurization. The high content N doping (24.58 wt%) and CoS nanoparticles encapsulated carbon nanofibers with ultra-large interlayer distance (0.422 nm) were synthesized, which improved the diffusion properties and phase behavior of sodium ions. The resulting CoS/NSCNF (NSCNF for nitrogen and sulfur co-doped carbon nanofibers) delivered superior rate performance of 358.5 mAh g-1 after 2250 cycles at 6 A g-1 , serving as anode for sodium-ion battery. The excellent storage performance ascribed to abundant N/S defects, enlarged carbon spacing, and the continuous one-dimensional structure of CoS/NSCNF, enhancing sodium ions storage ability contrasted with MOF-derived carbon. The density functional theory calculations further demonstrate that nitrogen-doping favors sodium ion adsorption ability of CoS/NSCNF, thereby improving storage performance. © 2022, The Authors. All rights reserved.

关键词： Metal ions

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MoSe2 nanosheets as a functional host for lithium-sulfur batteries

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能源化学 2020年第8期47卷 241-247页

作者： Lishun Meng Yuan Yao Jing Liu Zhao Wang Dong Qian Liuchun Zheng Bao-Lian Su Hong-En Wang State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China Beijing National Laboratory of Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China Hunan Provincial Key Laboratory of Chemical Power Resources College of Chemistry and Chemical Engineering Central South University Changsha 410083 Hunan China Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China Laboratory of Inorganic Materials Chemistry (CMI) University of Namur 61 rue de Bruxelles B-5000 Namur Belgium State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 Hubei China College of Physics and Electronics Information Yunnan Normal University Kunming 650500 Yunnan China

Lithium-sulfur batteries (LSBs) hold great potential for large-scale electrochemical energy storage ***,the shuttle of soluble lithium polysulfide (LiPSs) intermediates with sluggish conversion kinetics and random deposition of Li2S have severely degraded the capacity,rate and cycling performances of LSBs,preventing their practical *** this work,ultrathin MoSe2 nanosheets with active edge sites were successfully grown on both internal and external surfaces of hollow carbon spheres with mesoporous walls (MCHS).The resulting MoSe2@MCHS composite acted as a novel functional reservoir for LiPSs with high chemical affinity and effectively mediated their fast redox conversion during charge/discharge as elucidated by experimental observations and first-principles density functional theory (DFT) *** as-fabricated Li-S cells delivered high capacity,superior rate and excellent *** current work presents new insights on the delicate design and fabrication of novel functional composite electrode materials for rechargeable batteries with emerging applications.

关键词： MoSe2 Cathode host Lithium-sulfur batteries Shuttle effect Electrochemistry Density functional theory

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Oxygen vacancies boosting ultra-stability of mesoporous ZnO-CoO@N-doped carbon microspheres for asymmetric supercapacitors

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Science China materials 2020年第10期63卷 2013-2027页

作者： Di Yao Fulei Wang Wu Lei Yan Hua Xifeng Xia Jinping Liu Qingli Hao Key Laboratory for Soft Chemistry and Functional Materials Ministry of EducationSchool of Chemical EngineeringNanjing University of Science and TechnologyNanjing 210094China Chemical Engineering and Life Science and State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China

Long-term cycling stability of pseudocapacitive materials is pursued for high-energy ***,the mesoporous zinc-cobalt oxide heterostructure@nitrogendoped carbon(ZnO-CoO@NC)microspheres with abundant oxygen vacancies are self-assembled through a hydrothermal method combined with an annealing *** multifunctional polyvinyl pyrrolidone(PVP)is used as a structure-directing agent,the precursor of NC and the initiator of abundant oxygen vacancies in zinc-cobalt oxide *** demonstrates the generation of surface oxygen vacancies resulted from the reduction effect of conductive NC,and further confirms the weaker interaction between the metal ions and oxygen *** a result,the electrode based on ZnO-CoO@NC in 2 mol L^-1 KOH shows enhanced capacitive performance with an excellent cycle stability of 92%retention of the initial capacitance after 40,000 charge-discharge cycles at 2 A g^-1,keeping the morphology *** assembled asymmetric supercapacitor,graphene//ZnO-CoO@NC,also performs good cyclic stability with 94%capacitance retention after 10,000 cycles at 2 A g^-*** remarkable electrochemical performance of the self-assembled ZnO-CoO@NC composite is attributed to the mesoporous architecture,abundant oxygen vacancies,conductive ZnO scaffold for CoO crystals forming heterostructure of ZnO-CoO and the high conductive NC layer covering outside of the multi-metal oxide ***,the ZnO-CoO@NC holds great promise for high-performance energy storage applications.

关键词： supercapacitor zinc oxide cobaltous oxide doped carbon cycling stability heterostructure

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Frustration-controlled quantum phase transition between multiple singular two-stage Kondo behaviors in a tetrahedral quadruple quantum dot structure

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Physical Review B 2022年第7期105卷 075430-075430页

作者： Peng-Chao Wang Yi-Hui Wang Chong Chen Jun Zhang Wei Li Nan Nan Jia-Ning Wang Jun-Tao Yang Amel Laref Yong-Chen Xiong School of Mathematics Physics and Optoelectronic Engineering and Collaborative Innovation Center for Optoelectronic Technology Hubei University of Automotive Technology Shiyan 442002 People's Republic of China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Wuhan 430070 People's Republic of China Department of Physics and Astronomy Science Faculty King Saud University Riyadh 11451 Saudi Arabia Shiyan Bureau of Science and Technology 16 Chaoyang North Road Shiyan 442000 People's Republic of China

Semiconductor quantum dots are considered to be promising candidates for the hardware of quantum information technology and optoelectronic devices. Herein, motivated by a tetrahedrally shaped colloidal quadruple quantum dot structure made from In-based III–V semiconductors, which has been synthesized very recently by Leemans et al. [J. Am. Chem. Soc., 143, 4290 (2021)], we provide timely insight into the electronic transport and the quantum phase transition (QPT) for such an architecture. When the interdot hopping between different side dots (t2) is absent, a singular two-stage Kondo effect is revealed for small central-side coupling t1. The two screening processes are separated by an energy scale of the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction, and the fitting parameters deviate from the regular ones of the side-coupled double dot system. The RKKY interaction and temperature are well illustrated by functions of t14/(UTK12), where U and TK1 are the on-site electron-electron repulsion and the first Kondo temperature, respectively. When t2 turns on, the ground state of the side dots transits from a spin quadruplet to a magnetic frustration phase, and then to a singlet, through two first-order QPTs. In the frustration phase, another new two-stage Kondo effect is demonstrated, which includes the process of screening the local spin on the central dot firstly, and then that on the neighborless side dot is screened at a lower temperature. Both the Kondo temperatures are found to be rather sensitive to t2. When t2 is large enough, the reappearance of the regular Kondo effect is found. With fixed t2=0, charging the central dot triggers a transition from an antiferromagnetic correlation among the side dots to a ferromagnetic one, accompanied by a Kondo behavior in the central dot. We adopt the state-of-the-art numerical renormalization group method to implement the above behaviors, combined with analytical arguments.

关键词： Kondo effect Quantum phase transitions Quantum transport

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Synergistic Strategy of Rubidium Chloride Regulated Sno2and 4-Tert-Butyl-Benzylammonium Iodide Passivated Maxfa1-Xpbi3 for Efficient Mixed-Cation Perovskite Solar Cells

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SSRN 2023年

作者： Sun, Jia Gu, Yinsheng Lu, Yingwei Hu, Juntao Chen, Tao Zhu, Changfei Luo, Paifeng School of Materials Science and Engineering Hefei University of Technology Anhui Hefei230009 China Engineering Research Center of High Performance Copper Alloy Materials and Processing Ministry of Education Hefei University of Technology Hefei230009 China National Engineering Lab of Special Display Technology State Key Lab of Advanced Display Technology Academy of Opto-Electronic Technology Hefei University of Technology Hefei230009 China Hefei National Laboratory for Physical Sciences at Microscale CAS Key Laboratory of Materials for Energy Conversion Department of Materials Science and Engineering University of Science and Technology of China Anhui Province Hefei230026 China Institute of Energy Hefei Comprehensive National Science Center Hefei China

Nowadays, the MA-FA mixed-cation perovskite solar cells (PSCs), demonstrating much higher stability than that of single-cation MAPbI3 or FAPbI3, are still encountering a low-efficiency issue. The main reason is that there existing a lot of defects in SnO2 electron transport layers (ETLs) and perovskite absorbers. Herein, we develop a synergistic strategy of Rubidium Chloride (RbCl) doping and 4-tert-butylbenzylammonium iodide (tBBAI) passivation to fabricate high-performance MAxFA1-xPbI3 mixed-cation PSCs. The alkali halide RbCl is first selected as a novel doping additive to regulate the film properties of SnO2 and perovskites. Research shows that the negative Cl- ions can combine with uncoordinated Sn4+ ions due to their strong bonding ability, which can passivate the oxygen-vacancy-related defects and enhance the charge transport of SnO2 ETLs. Meanwhile, the doped Rb+ and Cl- ions may diffuse into perovskite lattices to promote grain growth and reduce the defects of perovskites. Besides, we employ an organic halide salt tBBAI to passivate perovskites and suppress surface defects. Results of deep level transient spectroscopy (DLTS) indicate that SnO2 and SnO2-RbCl based devices have deeper hole traps and large trap densities (ΔE=0.92 eV, NT=1.10×1016 cm-3;ΔE=0.93 eV, NT=2.16×1015 cm-3);while tBBAI-treated SnO2-RbCl-based devices own a shallower hole trap and a smaller trap density (ΔE=0.72 eV, NT=2.44×1013 cm-3);and the corresponding IPb and I(MA/FA) antisite defeats are also identified. Therefore, our synergistic strategy is effectively able to reduce the defect density and suppress the non-radiative recombination. Consequently, the best-performance MA0.85FA0.15PbI3 PSCs achieve an impressive power conversion efficiency (PCE) of 22.54% with a large open circuit voltage (Voc) of 1.16 V, which are by far the highest values of MA0.85FA0.15PbI3 mixed-cation PSCs. © 2023, The Authors. All rights reserved.

关键词： Perovskite solar cells

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