CERAMICS INTERNATIONAL
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2020
·
IF 3.83
Jian Guo,Binbin Tong,Yixuan Chen,Jianguo Chen,Jinrong Cheng
0.75BiFeO 3 -0.25BaTiO 3 (0.75BF-0.25BT) ceramics have been widely studied because of their high Curie temperature , good thermal stability and lead-free trait. The evolution of domain motion during electric poling and thermal depoling processes is closely related to the piezoelectric properties and thermal stability of ferroelectric ceramics . Herein, the non-180° domain reversals of 0.75BF-0.25BT ceramics in these two processes were investigated by an in situ XRD technique. The non-180° domain switching fraction during the poling and depoling processes was calculated quantitatively based on the (111) and (11 1 ‾ ) diffraction peaks. During the poling process, the non-180° domain reversal percentage N 111 and piezoelectric properties increase abruptly when the poling field exceeds 35 kV/cm and then saturate at the electric field of 50 kV/cm (N 111 reaches the maximum value of 59%). The domains switched under the poling electric field of 50 kV/cm are stable below 500 °C. The depoling temperature is sensitive to the domain switching fraction under different poling electric fields, and the ceramics under a strong poling field possess excellent thermal stability and high depolarization temperatures. This work revealed the relationship between the electric properties, domain switching, poling electric field, and depoling temperature in the 0.75BF-0.25BT ceramics, which may pave the way to enhancing the room temperature piezoelectric properties and their thermal stability.
研究领域:
材料科学
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物理学
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产品关联
DOI
高影响因子
Catalysts
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2021
·Vol. 11
·期 9
·1079
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IF 4.146
Song Zhou,Xi Liu,Jian Xu,Hui Zhang,Xiaosong Liu,Pengcheng Li,Xiaodong Wen,Yong Yang,Yongwang Li
As an alternative to noble metal hydrogenation catalysts, pure molybdenum carbide displays unsatisfactory catalytic activity for arene hydrogenation. Precious metals such as palladium, platinum, and gold are widely used as additives to enhance the catalytic activities of molybdenum carbide, which severely limits its potential applications in industry. In this paper, iron-promoted molybdenum carbide was prepared and characterized by various techniques, including in situ XRD, synchrotron-based XPS and TEM. while the influence of Fe addition on catalytic performance for toluene hydrogenation was also studied. The experimental data disclose that a small amount of Fe doping strongly enhances catalytic stability in toluene hydrogenation, but the catalytic performance drops rapidly with higher loading amounts of Fe.Keywords:molybdenum carbide;Fe-promoter;toluene hydrogenation;synchrotron-based XPS;in situ XRD
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
CATALYSIS LETTERS
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2020
·Vol. 150
·期 8
·2437-2445
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IF 2.482
Yang Zhi,Luo Mingsheng,Liu Qinglong,Shi Buchang
A potassium- and copper-modified iron-based catalyst (K–Cu–Fe/SiO 2 ) was synthesized by the co-precipitated method. The general structural properties of the catalyst were characterized with various techniques, including SEM, XRD, H 2 -TPR, N 2 adsorption–desorption and Raman spectroscopy. The results reveal that the fresh catalyst is mainly composed of α-Fe 2 O 3 phase with rod-shaped morphology formed by nanoparticles. The effect of activation process on the Fischer–Tropsch synthesis catalytic performance was then investigated. It shows that activation process has an important influence on the reactive stability. The in situ XRD and in situ Raman spectroscopy were used to study the structural changes of the Fe-based catalyst during reduction and reaction processes. The Fe 2 C iron carbide as the main active phase was observed after reduction process. Graphic Abstract
研究领域:
催化化学
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材料科学
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产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 41
·28389-28394
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IF 3.9
Cheng-Lu Yang,Chen Liang,Chao Gao,Jun Guo,Bu-Ming Chen,Hui Huang
A novel Bi13S18I2 structure was synthesized using a facile one-pot hydrothermal method and further optimized as an anode material using graphene. The graphene/Bi13S18I2 composite achieved a high discharge capacity with an initial value of 1126.5 mA h g−1 and a high and stable discharge capacity of 287.1 mA h g−1 after 500 cycles compared with pure Bi13S18I2, which derives from the inhibited volume expansion and high electrical conductivity obtained from graphene. In situ XRD was performed to analyze the Li storage mechanism in depth. The results support the feasibility of the new ternary sulfide Bi13S18I2 as a promising lithium ion battery.
研究领域:
材料科学
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能源存储
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Zhoufei Yang,Jin Wang,Chaojie Cui,Ying Jin,Gang Zhang,Henghui Zhou,Weizhong Qian
Compared with aluminum foil (Al foil), the three-dimensional (3D) aluminum foam (Al foam) has the characteristics of 3D interconnected metal wires and through-hole structure with high specific surface area, which exhibits great potential for application in high-power energy storage devices. In this work, 3D Al foam-based and Al foil-based cathode sheets were fabricated and assembled into pouch cells. In-situ XRD was employed to analyze the electrochemical reaction behavior of the two types of porous electrodes . The 3D Al foam-based cathode demonstrated faster electron transfer and lithium-ion diffusion as compared to the Al foil-based electrode, which is helpful for a uniform electrochemical reaction and decreases the electrochemical polarization. Electrochemical simulations and porous electrode models were built to understand these phenomena. The Al foam-based LiFePO 4 batteries exhibit much better power and energy performance than Al foil-based LiFePO 4 battery. The power density of the Al foam pouch cells is 7.0–7.7 kW/L when the energy density is 230–367 Wh/L, which is the highest power and energy density among reported Al foam-based devices. The new findings open up opportunities for the development of high-power and high-energy-density commercial batteries.
研究领域:
电化学
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材料科学
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能源存储
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电池技术
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多孔材料
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固态物理
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DOI
高影响因子
JOURNAL OF POWER SOURCES
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2018
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IF 6.945
Qiming Tang,Heng Su,Yanhui Cui,Andrew P. Baker,Yanchen Liu,Juan Lu,Xiaona Song,Huayu Zhang,Junwei Wu,Haijun Yu,Deyang Qu
As an advanced anode material for lithium-ion batteries, tin-chalcogenides receive substantial attention due to their high lithium-ion storage capacity. Here, tin chalcogenide (SnSe 0.5 S 0.5 ) nanoplates are synthesized using a facile and quick polyol-method, followed by heating at different temperatures. Results show that the as-prepared of SnSe 0.5 S 0.5 heated at temperature of 180 °C exhibits the best electrochemical performance with an outstanding discharge specific capacity of 1144 mA h g −1 at 0.1 A g −1 after 100 cycles and 682 mA h g −1 at 0.5 A g −1 after 200 cycles with a high coulombic efficiency (CE) of 98.7%. Even at a high current density of 5 A g −1 , this anode material delivers a specific capacity of 473 mA h g −1 . The high electrochemical performance of SnSe 0.5 S 0.5 is shown by in-situ XRD analysis to originate from an enhanced Li + intercalation and an alloy conversion process.
研究领域:
材料科学
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电化学
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纳米科技
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能源存储
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无机化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
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2016
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IF 4.803
Youpeng Li,Kaina Shang,Wenjie Zhou,Linyin Tan,Xuexue Pan,Mingna Liao,Jianfei Lei,Lingzhi Zhao
This work introduces an effective, inexpensive and large-scale production route to the fabrication of a novel honeycomb-spherical Co 3 O 4 -TiO 2 nanocomposite anode material for use in rechargeable lithium ion batteries. The microstructure and phase composition of the Co 3 O 4 -TiO 2 product were characterized systematically. The Co 3 O 4 -TiO 2 nanocomposite electrode yielded fairly high reversible capacity of ∼1000 mAh/g at 200 mA/g after 100 cycles. Moreover, the electrode exhibited extraordinary rate ability and could regain its original specific capaities as reversing to the low current densities. Meanwhile, when being applied as anode material in full cells, it still achieved remarkably improved electrochemical performance compared with traditional graphite material. Noticeably, in-situ XRD measurement verified the conversion mechanism for the Co 3 O 4 -TiO 2 electrode. The likely contributing factors to these outstanding electrochemical properties of the Co 3 O 4 -TiO 2 nanocomposite could be related to the distinctive morphology including interlaced Co 3 O 4 nanoflakes (NFs) and the TiO 2 nanoparticles (NPs), which contains superior structural stability and allows more channels for the Li + insertion/extraction reaction. This research shows that the as-prepared Co 3 O 4 -TiO 2 nanocomposite could be suitable for use as a favorable cycle performance anode material for lithium ion batteries.
研究领域:
材料科学
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电化学
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纳米材料
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能源存储
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电池技术
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2025
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IF 8.3
Chaoen Li,Ziyu Zhang,Li Che,YuYang Zhou,Honglin Gao,Hanjie Sun,Aiyi Dong
Electrolyzing seawater presents a promising strategy to address the energy crisis. The optimally sulfur-doped S 0.45 -MnCr layered double hydroxide (LDH) catalyst demonstrates exceptional hydrogen evolution reaction (HER) performance in alkaline seawater at 50 °C, requiring overpotentials of only 57.9 mV and 245.4 mV to achieve 10 and 500 mA cm −2 , respectively. For overall seawater splitting, it requires only 1.72 V to deliver 100 mA cm −2 . When used as a cathode in a magnesium-seawater batteries (MSBs), it delivers a power density of 7.80 mW cm −2 . Sulfur doping simultaneously triggers the formation of highly active MnCO 3 during synthesis. Characterization confirms that sulfur doping promotes chromium leaching, thereby enlarging the electrochemical active surface area (ECSA). In situ XRD analysis at various potentials verifies the formation of additional active MnCO 3 species during HER, consistent with the activity enhancement observed in chronopotentiometric measurements. This work offers novel insights for designing bifunctional catalysts for direct seawater electrolysis.
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yuezhen Mao,Rongna Chen,Huanhuan You,Yang Liu,Sunrui Luan,Li Hou,Faming Gao
Antimony-based anodes possessing advantages of stable operating voltage and high theoretical capacity can replace graphene as alloy-based electrodes material in LIBs applications. However, the problems of capacity decaying and poor stability of Sb-based materials due to volume expansion and structural crushing during the long-term cycling remain to be solved. Therefore, we propose a strategy of using S and N co-doped carbon nanofibers encapsulated with Sb nanoparticles to overcome the above problems. The proposed material exhibits an excellent lithium storage performance with a high reversible specific capacity of 734 mAh g −1 at 0.1 A g −1 after 50 cycles (474.8 mAh g −1 at 1 A g −1 after 800 cycles, 394.5 mAh g −1 at 2 A g −1 after 2000 cycles). Importantly, a specific capacity of 288.5 mAh g −1 remains after more than 5000 cycles. The superior electrochemical performance of the S and N co-doped electrode is attributed to the proven structure and stability of the carbon matrix alleviating the volume changes of Sb during the process of lithium intercalation and extraction. The alloying/de-alloying reactions of the S@Sb@N-CNFs composite in the first charging/discharging process were systematically investigated by ex-situ XRD . This strategy of S and N co-doped carbon matrix could establish Sb-based materials as potential high-performance anodes for LIBs.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
·
IF 16.744
Huajun Xu,Jiaxing Fan,Di Pang,Yingying Zheng,Gang Chen,Fei Du,Yury Gogotsi,Yohan Dall'Agnese,Yu Gao
Ferric vanadate (FeVO 4 ) is a desirable anode candidate for lithium-ion battery (LIB) and sodium-ion battery (SIB) because of its high theoretical capacity, low cost and ease of synthesis. However, its practical application is hindered by its volume expansion during the Li + /Na + insertion/extraction and low electronic conductivity. Herein, flexible and free-standing FeVO 4 /Ti 3 C 2 T x (FVO/MX) films have been made via combining FeVO 4 nanorods and Ti 3 C 2 T x MXene sheets via a simple method of vacuum assisted filtration. In the composite films, Ti 3 C 2 T x sheets act as host and FeVO 4 nanorods are uniformly deposited onto the layers. FeVO 4 nanorods are encapsulated by Ti 3 C 2 T x sheets, forming a three-dimensional network sandwich structure. The binder-free FVO/MX films exhibited superior electrochemical performance due to the synergyy between FeVO 4 and Ti 3 C 2 T x . Specifically, when FVO/MX electrode was used in a lithium-ion battery, it delivered reversible capacity of 1179 mAh g −1 and 1125 mAh g −1 after 250 cycles at a current density of 0.1 A g −1 . Besides, the FVO/MX = 2:1 anode delivered a reversible capacity of 428 mAh g −1 at 5 A g −1 and 69.5% capacity was retained after 2500 cycles. Moreover, the Na-ion storage capacity reaches 129 mAh g −1 at a high current density of 5 A g −1 , showing capacity retention of 81.1% after 5000 cycles. The charging and discharging mechanism of the FVO/MX based lithiumion battery was studied by in-situ XRD technique. Owing to high metallic conductivity and 2D morphology of Ti 3 C 2 T x MXene, 3D networks can be constructed by combining other active agents, suggesting that MXene is a promising host material for the next-generation flexible energy storage devices.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
·
IF 9.4
Tao Liu,Lijun Xu,Xuejie Wang,Haoliang Lv,Bicheng Zhu,Jiaguo Yu,Liuyang Zhang
The natural abundance of sodium has fostered the development of sodium-ion batteries for large-scale energy storage. However, the low capacity of the anodes hinders their future application. Herein, carbon-encapsulated MnSe-FeSe nanorods (MnSe-FeSe@C) have been fabricated by the in-situ transformation from polydopamine-coated MnO(OH)-Fe 2 O 3 . The heterostructure constructed by MnSe and FeSe nanocrystals induces the formation of built-in electric fields, accelerating electron transfer and ion diffusion, thereby improving reaction kinetics. In addition, carbon enclosure can buffer the volumetric stress and enhance the electrical conductivity. These aspects cooperatively endow the anode with superior cycling stability and distinguished rate performance. Specifically, the discharge capacity of MnSe-FeSe@C reaches 414.3 mA h g −1 at 0.1 A g −1 and 388.8 mA h g −1 even at a high current density of 5.0 A g −1 . In addition, it still retains a high reversible capacity of 449.2 mA h g −1 after 700 long cycles at 1.0 A g −1 . Further, the ab initio calculation has been employed to authenticate the existence of the built-in electric field by Bader charge, indicating that 0.24 electrons in MnSe were transferred to FeSe. The in-situ XRD has been used to evaluate the phase transition during the charging/discharging process, revealing the sodium ion storage mechanism. The construction of heterostructure material paves a new way to design performance-enhanced anode materials for sodium-ion batteries.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
Advanced Energy Materials
·
2018
·Vol. 9
·期 1
·1802739
·
IF 21.875
Ang Gao,Min Li,Nannan Guo,Daping Qiu,Yan Li,Senhao Wang,Xia Lu,Feng Wang,Ru Yang
Novel and low-cost rechargeable batteries are of considerable interest for application in large-scale energy storage systems. In this context, K-Birnessite is synthesized using a facile solid-state reaction as a promising cathode for potassium-ion batteries. During synthesis, an ion exchange protocol is applied to increase K content in the K-Birnessite electrode, which results in a reversible capacity as high as 125 mAh g −1 at 0.2 C. Upon K + exchange the reversible phase transitions are verified by in situ X-ray diffraction (XRD) characterization. The underlying mechanism is further revealed to be the concerted K + ion diffusion with quite low activation energies by first-principle simulations. These new findings provide new insights into electrode process kinetics, and lay a solid foundation for material design and optimization of potassium-ion batteries for large-scale energy storage.
研究领域:
材料科学
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电化学
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能量存储与转换
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电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）