Article
Materials Science, Ceramics
Xinkun Liu, Ying Dai, Xinmei Pei, Wen Chen
Summary: Lead-free Sr-doped BCZT thin films were successfully prepared and their structure, electric properties and ECE were investigated. The results show that the phase transition temperatures of the films change with increasing Sr content and merge at room temperature. The BCZT-0.05Sr film exhibits a giant ECE near room temperature.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Wenyue Zhao, Ze Li, Zhao Wang, Yazhou Peng, Lei Shi, Wenjing Hua, Jie Wang, Lidong Wang, Wei-Dong Fei, Yu Zhao
Summary: In this study, large and regulable electrocaloric effects at room temperature are achieved in PbZrO3/Ca3Mn2O7 bilayer films based on PbZrO3 phase transition, and the sign of adiabatic temperature change, ΔT, is determined by Ca3Mn2O7 thickness. The formed PbZrO3-Ca3Mn2O7 heterojunction reduces the carrier concentration of the film and establishes a built-in electric field, greatly enhancing the withstanding voltage of the bilayer films. A maximum positive ΔT of 66.5 K is obtained in the bilayer film with a thin Ca3Mn2O7 layer, while a negative ΔT of -9.9 K is obtained with a thick Ca3Mn2O7 layer, both near room temperature. This work presents a simple and effective approach to designing huge electrocaloric effects based on antiferroelectric-containing multilayers near room temperature.
Article
Multidisciplinary Sciences
Xitao Liu, Zhenyue Wu, Tong Guan, Haidong Jiang, Peiqing Long, Xiaoqi Li, Chengmin Ji, Shuang Chen, Zhihua Sun, Junhua Luo
Summary: Most known electrocaloric materials exhibit poor cooling performance near room temperature, limiting their applications. The emerging family of hybrid perovskite ferroelectrics shows superior performance, offering an ideal platform for achieving room temperature solid-state refrigeration with large electrocaloric effects.
NATURE COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Jie Chen, Biaolin Peng, Wenhong Sun
Summary: This study demonstrates that the negative EC effect of Mn-BTO thin films can be significantly improved by constructing nano-scaled rhombohedral phases. The use of SiN/p-GaN composite substrates instead of traditional Pt(111)/TiOx/SiO2/Si(100) substrates enhances the negative EC effect.
Article
Chemistry, Physical
Xian-Xiong Huang, Peng-Zu Ge, Tian -Fu Zhang, Qiu-Xiang Liu, Yan-Ping Jiang, Zhen-Hua Tang, Xiao-Bin Guo, Xin-Gui Tang
Summary: More and more researchers are studying the electrocaloric temperature change in polar materials caused by an applied electric field. This study focuses on Ba-doped PbHfO3 (PBH) films prepared by sol-gel method and investigates their components, microstructures, dielectric polarization, and electro-caloric effects (ECEs). The addition of Ba2+ transforms the PBH films from antiferroelectric (AFE) to ferroelectric (FE) and shifts their dielectric peaks towards lower temperatures. The maximum Delta T obtained in the Pb0.8Ba0.2HfO3 FE film is 41.1 K, an order of magnitude larger than the PbHfO3 film and Pb0.9Ba0.1HfO3 film. The Landau-Devonshire theory is employed to explain this phenomenon, suggesting that the rapid variation of energy barrier height near the phase transition temperature is beneficial for achieving large polarization change and high oT in solid-state cooling devices.
JOURNAL OF MATERIOMICS
(2023)
Article
Materials Science, Multidisciplinary
Juntao Xie, Hongtao Li, Xu Sang, Huimin Zhang, Aimin Chang
Summary: The ceramic-polymer composite flexible films composed of BVT fillers and PVDF matrix were prepared using a solid-state reaction method. SEM tests showed that as the powder content increased, the film density and the interface effect between the polymer and powder decreased. The measurement results of the dielectric constant and dielectric loss of the film indicated that reducing the content of BVT powder could reduce the dielectric loss of the film under certain conditions.
Article
Chemistry, Analytical
Dawu Lv, Wenfeng Shen, Weigang Chen, Ruiqin Tan, Lei Xu, Weijie Song
Summary: An improved ammonia sensor based on PANI and PSS was proposed, showing significantly enhanced response and stability for detecting NH3, making it suitable for large-scale commercial production and potential applications in smart wearable devices.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Materials Science, Ceramics
Ning Xu, Qi Liu, Zixiong Sun, Jiahui Ma, Yuxin Luo, Yongping Pu
Summary: The doping of La3+ improves the temperature stability of Ba1-xLaxTi0.9Sn0.1O3 ceramics near room temperature, enhances diffuse phase transition, and boosts the performance of ECE.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Guoming Qian, Kongjun Zhu, Kang Yan, Jing Wang, Jinsong Liu, Zhong Yang, Weiqing Huang, Chuanxiang Zhang, Kan Bian
Summary: This study investigates the issue of interface compatibility in nanocomposites and obtains better compatibility and high electrocaloric performance through hot pressing.
FUNCTIONAL MATERIALS LETTERS
(2022)
Article
Nanoscience & Nanotechnology
Ye Zhao, Jinhua Du, Junlin Yang, Lipeng Zhu, Yanyu Wang, Yong Li, Xihong Hao
Summary: In this study, a large room-temperature electrocaloric response is achieved through the relaxor enhancement effect and multilayer ceramic construct. The addition of CaZrO3 breaks the long-range order, enhancing the temperature change (△T) and widening the temperature span (T-span) at room temperature. The multilayer ceramic construct improves the breakdown electric field (E-b) by reducing defects and leads to a higher △T.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Duo-Fu Li, Xiang-Hong Deng, Yu-Xiao Ma, Dong-Sheng Liu, Xi-Feng Huang, Xiao-Feng Zhao, Wen-Tong Chen, Yan Sui
Summary: This study discovered a ferroelectric hybrid material that can be used for research on near-room-temperature multifunctional switching smart materials and wearable devices, and successfully prepared flexible composite films.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Nanoscience & Nanotechnology
Xian-Xiong Huang, Tian-Fu Zhang, Rong-Zhen Gao, Hou-Bing Huang, Peng-Zu Ge, Hui Tang, Xin-Gui Tang
Summary: In this study, a PbHfO3 antiferroelectric (PHO AFE) film was fabricated by a sol-gel method, which exhibited a high temperature change and acceptable electrocaloric strength, making it a promising material for next-generation solid-state refrigeration in integrated circuit cooling. Furthermore, a modified Ginzburg-Landau-Devonshire free-energy theory was adopted to understand the underlying physical mechanism for positive and negative electrocaloric effects in the PHO AFE film.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Zhiliang Li, Jingxuan Wang, Xiaoqi Yang, Zhi Gao, Yuli Xue, Jianglong Wang, Shufang Wang
Summary: Cu2Se is a new promising thermoelectric material with high performance, environmentally friendly features, and low cost, which has attracted great attention. This study focuses on preparing flexible b-axis oriented alpha-phase Cu2Se thin films using pulsed laser deposition technology, which exhibit much higher in-plane power factor at room temperature compared to Cu2Se random-oriented bulks. The developed flexible TE thin film devices based on the oriented alpha-Cu2Se films show high resistance fluctuation tolerance after bending and a maximum power density of-10.2 W m-2 under a temperature difference of-40 K. These findings and the controllable preparation technology will further promote the application of flexible TE materials as self-sufficient energy sources in wearable electronic devices.
MATERIALS TODAY PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Qinghui Jiang, Deng Pan, Yunfan Wang, Yong Liu, Yubo Luo, Junyou Yang, Baowen Li, Steve Dunn, Haixue Yan
Summary: There is an increasing demand for powering Internet of Things devices using ambient energy sources. Researchers have developed a flexible, low-temperature thermoelectric composite film by combining a ferroelectric polymer with a specific material. This film exhibits high Seebeck voltage and power factor, providing a new solution for thermoelectric power generation.
Article
Polymer Science
Vishal Singh, Bharti Singh
Summary: A high-performance triboelectric nanogenerator (TENG) based on MoS2 filled PVDF has been fabricated and demonstrated to enhance the output performance. The addition of MoS2 into the PVDF matrix improves the fraction of crystalline beta-phase, dielectric constant, and surface roughness of the TENG. The TENG with 7 wt% of MoS2 generates a maximum output voltage and current of 189V and 1.61muA respectively, and a maximum power density of 104.5muWcm(-2). The study also shows the impact of tapping frequency and contact force on the TENG, as well as its practical application in powering electronic devices.
Article
Engineering, Electrical & Electronic
Zhongran Yao, Kongjun Zhu, Jie Zhang, Jun Li, Xia Li, Jing Wang, Kang Yan, Jinsong Liu
Summary: By adding LiF, the solid-state Li0.35La0.55TiO3-xwt.% LiF electrolytes show improved conductivity and crystal structure. The conductivity and grain size of the electrolyte vary with different amounts of LiF addition, making it suitable for different types of solid-state batteries.
JOURNAL OF ELECTRONIC MATERIALS
(2022)
Article
Chemistry, Physical
Jiatao Chen, Kongjun Zhu, Penghua Liang, Meng Wu, Yu Rao, Hongjuan Zheng, Jinsong Liu, Kang Yan, Jing Wang
Summary: In this study, a hierarchical porous CoMoO4-CoO/S@rGO nano polyhedron structure was successfully synthesized via a metal-organic framework-engaged strategy with sulfur doping, leading to improved electrode performance. The porous structure alleviated volume expansion and exposed more active sites, resulting in ultrahigh specific capacity and excellent rate capacity of the electrode. This work demonstrates that rational structural design and insights into anionic doping have guiding significance for other metal oxides with high capacity and high-rate capability.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Electrochemistry
Meng Wu, Kongjun Zhu, Zhongran Yao, Penghua Liang, Jie Zhang, Yu Rao, Hongjuan Zheng, Feng Shi, Kang Yan, Jinsong Liu, Jing Wang
Summary: Reduced graphene oxide-modified V6O13 nanostructure hybrids with high electrical conductivity and stable structure were prepared using a facile hydrothermal method. The incorporation of graphene oxide effectively improved the electron conductivity and structural stability of the nanocomposite. The resulting V6O13@rGO showed excellent rate capability and capacity retention, indicating its potential as a cathode material for next-generation lithium-ion batteries.
Article
Chemistry, Physical
Penghua Liang, Kongjun Zhu, Yu Rao, Hongjuan Zheng, Zhongran Yao, Meng Wu, Jie Zhang, Jinsong Liu, Kang Yan, Jing Wang, Qiuying Xia, Hui Xia
Summary: In this study, flexible V2O3@carbon nanofibers were successfully synthesized as anode materials for lithium-ion batteries. The electrode exhibited outstanding capacity performance and long cycle life. The urchinlike V2O3 with large specific surface area and abundant active sites, combined with carbon nanofibers, formed a conductive network that enhanced conductivity and improved lithium-ion diffusion efficiency.
ACS APPLIED ENERGY MATERIALS
(2022)
Article
Materials Science, Ceramics
Guo-Qing Li, Min Yu, Hang Luo, Ze-Ya Huang, Ren-Li Fu, Francesco Gucci, Theo Saunders, Kong -Jun Zhu, Dou Zhang
Summary: To solve the problems in the production process of wood-derived C-SiC composites, such as low infiltration efficiency and poor mechanical properties, thermal modification of fir at low temperatures combined with sol-gel infiltration was used to produce biomorphic ceramics. The materials showed improved interfacial bonding and mechanical properties. The highest compressive strength and bending strength were observed in composites sintered at 1400 degrees C, while lower strengths were observed in composites sintered at 1600 degrees C due to excessive consumption of carbon. Thermal modification can promote slurry infiltration and improve the mechanical properties of the composites.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Jiatao Chen, Kongjun Zhu, Yu Rao, Penghua Liang, Jie Zhang, Hongjuan Zheng, Feng Shi, Kang Yan, Jing Wang, Jinsong Liu
Summary: Ingenious morphology design and doping engineering significantly enhance the conductivity and reduce the volume expansion of transition metal oxides as anode materials for lithium-ion batteries. In this study, S-0.15-Fe2O3@C nano-spindles with a hierarchical porous structure were synthesized through carbonization and S-doping. The S-doping increases capacitive contribution, charge transfer capability, and Li+ diffusion rate, leading to the superior lithium storage performance of the S-0.15-Fe2O3@C electrode with high specific capacity, ultrahigh rate capability, and excellent cycling stability. The strategy can be extended to other metal oxides for high-rate capability and low volume expansion anodes.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Physical
Jie Zhang, Yu Wang, Kongjun Zhu, Penghua Liang, Yu Rao, Jiatao Chen, Hongcheng Li, Hongjuan Zheng, Jinsong Liu, Jing Wang, Kang Yan
Summary: In this study, a hierarchical micro-nano hydrangea-like NiCo2O4/V2O3 composite array (NCO/VO) was prepared on a nickel foam substrate as a free-standing anode for lithium-ion batteries (LIBs) using a facile one-step hydrothermal method combined with heat treatment. The introduction of V2O3 to form a composite structure with NCO improved the electronic and ionic conductivity of the electrode. The synergistic effect of porosity, composite structure, and micro-nano architecture resulted in excellent electrochemical performance of the electrode. The as-prepared electrode exhibited a specific capacity of 1155.6 mA h g-1 after 200 cycles at a current density of 100 mA g-1, with a retention ratio of 91.02%. At a higher current density of 1000 mA g-1, it delivered a specific capacity of 750 mA h g-1, demonstrating excellent rate performance. This work highlights NCO/VO-NF as a promising candidate anode for next-generation LIBs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Penghua Liang, Kongjun Zhu, Jiatao Chen, Yu Rao, Hongjuan Zheng, Jun Guo, Zhihan Kong, Jie Zhang, Jinsong Liu, Kang Yan, Jing Wang
Summary: In this study, the researchers demonstrated the co-modification of oxygen vacancies and heterojunctions in VO2(B) (VO-VO2/MXene) as a cathode material for zinc-ion batteries (ZIBs). They found that the combination of VO-VO2 with MXene introduces an interfacial electric field, resulting in synergistic enhancement in electrochemical activity. The VO-VO2/MXene composite exhibited high specific capacity and excellent cycling lifespan for ZIBs. This work provides a reliable strategy for the co-modification of metal oxide electrodes with oxygen vacancies and heterostructures.
JOURNAL OF POWER SOURCES
(2023)
Article
Chemistry, Multidisciplinary
Xijuan Li, Hongjuan Zheng, Yulong Wang, Xia Li, Jinsong Liu, Kang Yan, Jing Wang, Kongjun Zhu
Summary: Pure TiO2 and 3% Y-doped TiO2 were prepared through hydrothermal method, and then reduced TiO2 and 3% Y-TiO2 were obtained by thermal conversion treatment. The synergistic effect of Y doping and TiO2 reduction was observed, leading to enhanced photocatalytic performance. The improvement was attributed to expanded light absorption range and reduced charge recombination rates caused by Y doping, as well as the disordered shells filled with oxygen vacancies and Ti3+ resulting from reduction treatment. This discovery provides a new perspective for modifying photocatalytic materials and improving their performance.
Article
Chemistry, Multidisciplinary
Xia Li, Hongjuan Zheng, Jingjin Liu, Hongcheng Li, Jing Wang, Kang Yan, Jingsong Liu, Feng Dang, Kongjun Zhu
Summary: BaTiO3/CeO2 nanoparticles with heterogeneous structure were successfully synthesized using a gel-assisted hydrothermal method. The particle sizes decreased and the surface became rough when the molar ratio of Ti/Ce was adjusted. The main body and surface of the nanoparticles were speculated to be BaTiO3 and CeO2 protrusions, respectively. The BaTiO3/CeO2 nanoparticles with a Ti/Ce molar ratio of 0.875:0.125 exhibited the strongest catalytic ability when light irradiation and ultrasonication were applied simultaneously.
Article
Chemistry, Analytical
Penghua Liang, Kongjun Zhu, Yu Rao, Hongjuan Zheng, Zhihan Kong, Jiatao Chen, Jinsong Liu, Kang Yan, Jing Wang
Summary: Freestanding H2V3O8/MXene film with good electrical conductivity and flexibility was synthesized using high temperature mixing hydrothermal method and coating method. The film exhibited excellent electrochemical properties when used as cathode material for aqueous zinc ion batteries and solid-state zinc ion batteries.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Yu Rao, Kongjun Zhu, Guoliang Zhang, Feng Dang, Jiatao Chen, Penghua Liang, Zhihan Kong, Jun Guo, Hongjuan Zheng, Jie Zhang, Kang Yan, Jinsong Liu, Jing Wang
Summary: A hybrid structure of MoS2/V2O3@C-rGO was synthesized using a high-temperature mixing method, leading to superior Li+/Na+ storage performance due to the interface construction and carbon materials introduction.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Zhihan Kong, Kongjun Zhu, Yu Rao, Penghua Liang, Jiatao Chen, Wei Wang, Chuanxiang Zhang, Jingsong Liu, Kang Yan, Jing Wang
Summary: Graphene and its derivatives, with their unique electroactive properties, have great potential in energy storage applications. In this study, nitrogen-doped reduced graphene oxide (N-rGO) nanoparticles were synthesized using a one-pot solvothermal method for supercapacitor applications. The N-rGO-based electrode exhibited excellent specific capacitance and stability.
Article
Chemistry, Physical
Jiatao Chen, Kongjun Zhu, Penghua Liang, Yu Rao, Xia Li, Hongjuan Zheng, Kang Yan, Jing Wang, Jinsong Liu
Summary: The carbon-coated anatase TiO2 doped with S (S-TiO2 @C) electrode, with high porosity and substantial carbon content, exhibits superior rate capability and long cycle life, providing a new strategy for optimizing the sodium storage capability of sodium-ion battery electrodes.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Jing Wang, Xuhui Fan, Zhen Liu, Kongjun Zhu, Hao Yuan, Zehan Zheng, Lei Zhao, Ji Zhang, Qibin Yuan, Jing-Feng Li
Summary: This study achieves high recoverable energy storage density and energy efficiency in lead-free AgNbO3-based ceramics through phase engineering and Bi-doping, making them promising for applications in advanced high-power electric and electronic devices.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
