IONICS
·
2019
·Vol. 25
·期 10
·4567-4576
·
IF 2.289
Xu Chun-Sheng,Yu Hai-Tao,Guo Chen-Feng,Xie Ying,Ren Ning,Yi Ting-Feng,Zhang Guo-Xu
To improve the stability and performance of the cathode materials, an ionic conductor layer was coated successfully on the surface of Li 1.2 Mn 0.54 Ni 0.13 Co 0.13 O 2 (LMNC) microspheres. The structural analysis confirmed that LiV 3 O 8 coating did not change the basic structure of LMNC, and all obtained materials are solid solutions with a good-layered structure and a good crystallinity. The microscopy measurement showed that the thickness of the coating layer for the LV-3 sample is about 2.5 nm. This appropriate layer is helpful for improving the surface stability of LMNC and the diffusion of lithium, leading to an obvious enhancement of the electrochemical performance. Our result confirmed that the average discharge specific capacities for LV-3 sample at 0.1 C, 0.2 C, 0.5 C, 1 C, and 3 C are respectively 265.9, 219.1, 188.0, 156.3, and 121.5 mAh g −1 , which are much larger than the values of other samples. After 50 cycles at a 1 C rate, the capacity retentions for different samples are 60.7%, 74.0%, 87.6%, and 70.4%, indicating that LV-3 sample exhibits the best performance. Furthermore, EIS measurements showed that the diffusion coefficient for LV-3 sample is calculated to be 1.26 × 10 −15 cm 2 s −1 , which is also the largest value among all considered samples. Our experiments identified that coating an ionic conductive layer on the cathode material surface will significantly improve their rate capacity and cycling stability.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态离子学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Hui Chen,Jinfeng Wang,Chenchen Jia,Junpeng Mou,Lei Zhu
For the purpose of increasing the power conversion efficiency (PCE) meanwhile decreasing the cost of dye-sensitized solar cell (DSSC), Cu 2 ZnSnS 4 - multiwall carbon nanotubes (CZTS-MWCNTs) nanohybrid Pt-free counter electrode (CE) was prepared via a facile fabricating route. In brief, CZTS nanoparticles were synthesized by a solvothermal method and the composite film was fabricated by spin coating the aqueous solution of the composite. The short-circuit current density and PCE of the DSSC with CZTS-MWCNTs CE were found to be 16.62 mA cm −2 and 9.04%, respectively. But the corresponding values were 15.42 mA cm −2 and 8.74% for a DSSC with a pure Pt-CE. This is owing to the synergistic effect of the intrinsic superior electrocatalytic activity of the CZTS nanoparticles and highly specific surface area and high electrical conductivity of the MWCNTs . The presence and distribution of CZTS-MWCNTs on the CE were characterized by X-Ray Diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM), respectively. Cyclic voltammetry (CV) and electrochemical impedance spectra (EIS) were examined for confirming the high electrocatalytic efficiency of this nanohybrid system.
研究领域:
材料科学
·
能源化学
·
纳米技术
·
电化学
·
光伏器件
✓ 已验证
DOI
高影响因子
SN Applied Sciences
·
2020
·Vol. 2
·期 7
·1156
·
IF 0
Liu Honghong,Thomas Tiju,Li Rongrong,Shen Hangjia,Wang Jiacheng,Yang Minghui
Lithium sulfur (Li–S) batteries are next general energy storage systems due to their high thereotical energy density, low cost and environmental friendly. Herein, we develop a composite polysulfide mediator based on carbon nanotubes enwrapped by zinc sulfide (CNTs@ZnS) nanoparticles as multifunctional host materials for sulfur cathode. The ZnS nanoparticles is uniformed coating on the outside layer of functionalized carbon nanotubes. The unique structure of CNTs@ZnS ensure the chemical adsorption on ZnS and fast electron transfer from ZnS to carbonnanotubes. The presence of ZnS efficiently alleviates the shuttle effect of soluble lithium polysulfide intermediates and hence offers a mean to further enhancing the reaction activity via sulfophilic property of ZnS and catalytically accelerate the conversion of polysulfides to insoluable Li 2 S. The high conductivity of carbon nanotubes results in rapid electron transfer. The CNTs@ZnS cathode offers an excellent specific capacity of ~ 1003 mAh g −1 after 100 cycles at 0.2C. Furthermore significant cycling performance at 0.2C with 3.1 mg cm −2 sulfur loading for 500 cycles is observed with 0.05% capacitance decay per cycle. The results provide insights to develop high-performance Li–S batteries based on multifunctional host materials.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米科技
·
功能材料
✓ 已验证
DOI
JOURNAL OF POWER SOURCES
·
2017
·
IF 6.395
Haoxiang Yu,Minghe Luo,Hua Lan,Lei Yan,Shangshu Qian,Wuquan Ye,Miao Shui,Nengbing Long,Jie Shu
The preparation and characterization of Pb 1- x Ba x Li 2 Ti 6 O 14 ( x = 0, 1/4, 1/2, 3/4, 1) as anode materials for lithium ion batteries are investigated in this research. The structure, morphology and electrochemical properties are compared with each other by changing the Pb/Ba atomic ratio in Pb 1- x Ba x Li 2 Ti 6 O 14 . It can be observed that each sample shows the same orthorhombic structure with Cmca space group. Moreover, it can also be found that the working potential, conductivity, cycling and rate performances of as-received samples gradually change along with the evolution of x in Pb 1- x Ba x Li 2 Ti 6 O 14 ( x = 0, 1/4, 1/2, 3/4, 1). Electrochemical evaluation shows that the operating potential of the as-received sample gradually decreases with increasing x value in Pb 1- x Ba x Li 2 Ti 6 O 14 and its initial charge capacity increases reversely. Moreover, different Pb/Ba atomic ratio also brings different cycling stability for Pb 1- x Ba x Li 2 Ti 6 O 14 . Especially for Pb 3/4 Ba 1/4 Li 2 Ti 6 O 14 , it presents better electrochemical properties than other samples. After 120 cycles, the reversible capacity of Pb 3/4 Ba 1/4 Li 2 Ti 6 O 14 is maintained at 129.7 mAh g −1 with capacity retention of 88.3%. In addition, its electrochemical reversibility is also demonstrated by in-situ X-ray investigation.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机化学
·
固态化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 27
·10593-10600
·
IF 8.262
Wei Wen,Jin-Ming Wu,Yin-Zhu Jiang,Jun-Qiang Bai,Lu-Lu Lai
Li-ion microbatteries find wide applications in microdevices. It is important to develop electrode materials with high areal capacity, excellent rate capability and superior safety for microbatteries. TiO2 nanowire arrays satisfy the requirements of high areal capacity, short transport lengths and superior safety for microbatteries, but their areal/volumetric capacity is hindered by the insufficient surface area. TiO2 nanotrees can effectively eliminate these disadvantages of TiO2 nanowires; however, the electrochemical performances of TiO2 nanotrees for Li-ion microbatteries remain unexplored. It is highly desired yet challenging to construct two-dimensional TiO2 nanobranches with an ultrathin thickness and large length on nanoarrays, to maximize the surface area and structural hierarchy of electrodes. Herein, we developed a novel synthetic strategy to fabricate TiO2 nanotrees by depositing anatase/TiO2(B) mixed phase ultrathin nanobelts onto single-crystalline anatase nanowire arrays. The nanobelt branches were several nanometers in thickness and 200–260 nm in length. The growth process and the electrochemical mechanism were investigated. The unique nanoarchitecture and optimal phase structure endow the electrode with high areal capacity and rate capability, which is the best performance for TiO2 nanowire arrays ever documented. The 2nd discharge capacity of the TiO2 nanotrees at 0.1 mA cm−2 is ca. 267 μA h cm−2, corresponding to a volumetric capacity of 330 mA h cm−3. The TiO2 nanotrees have an areal capacity of 205, 141, 97 and 69 μA h cm−2 at a current density of 0.5, 2.0, 5.0 and 10.0 mA cm−2, respectively. The capacity can remain stable for 400 charge–discharge cycles at 1.0 mA cm−2. The present strategy may give hints to elegant electrode designs for energy applications.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
微电子器件
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·Vol. 10
·期 5
·4090-4096
·
IF 1.5
Jiabin Hao,Lei Zhong,Jintao Liu,Fangli Yang,Hongli Bai,Changwei Su,Junming Guo
Copper-doped lithium manganese spinel LiCu x Mn 2-x O 4 (0 ≤ x ≤ 0.10) as lithium ion cathode material were synthesized by a fameless combustion synthesis at 500 °C for 3 h, two-stage calcination at 600 °C for 3 h. The phase composition was determined by X-ray diffraction (XRD), which indicated that all samples exhibited a single spinel structure except that LiCu 0.08 Mn 1.92 O 4 had a little impurity of Mn 3 O 4 . Micro-morphology of the materials were characterized by scanning electron microscopy (SEM), suggesting particle size of samples was nearly uniform when copper-doped amount x ranged from 0 to 0.06, the particle of LiCu 0.08 Mn 1.92 O 4 and LiCu 0.10 Mn 1.90 O 4 more seriously agglomerated together than that of other samples. The cycle performance tests indicated that the sample LiCu 0.06 Mn 1.94 O 4 had the highest initial discharge specific capacity of 128.1 mA h . g -1 and the 150 th capacity retention was 70.1% at 0.2 C rate. Cyclic voltammetry and electrochemical impedance spectroscopy of the sample LiCu 0.06 Mn 1.94 O 4 illustrated that appropriate copper-doped modification can improve electrochemical reversibility as well as suppress electrochemical impedance.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机功能材料
·
锂离子电池
✓ 已验证
DOI
高影响因子
Small
·
2021
·Vol. 18
·期 8
·2106323
·
IF 13.281
Jingwei Zhu,Benlin He,Xinpeng Yao,Haiyan Chen,Yanyan Duan,Jialong Duan,Qunwei Tang
The precise phase control of Cs-Pb-Br derivatives from 3D CsPbBr 3 to 0D Cs 4 PbBr 6 highly determines the photovoltaic performance of all-inorganic CsPbBr 3 perovskite solar cells (PSCs). Herein, the preferred phase conversion from precursor to Cs-Pb-Br derivatives is revealed by theoretically calculating the Gibbs free energies (∆ G ) of various phase conversion processes, allowing for a simplified multi-step solution-processable spin-coating method to hinder the formation of detrimental 0D Cs 4 PbBr 6 phase and enhance the photovoltaic performance of a PSC because of its large exciton binding energy, which is regarded as a recombination center. By further accelerating the interfacial charge extraction with a novel 2D transition metal dichalcogenide ReSe 2 , the hole-free CsPbBr 3 PSC achieves a champion efficiency of 10.67% with an impressive open-circuit voltage of 1.622 V and an excellent long-term stability. This work provides an in-depth understanding on the precise Cs-Pb-Br perovskite phase control and the effect of derivatives on photovoltaic performance of advanced CsPbBr 3 PSCs.
研究领域:
材料科学
·
光伏技术
·
纳米材料
·
能源化学
·
半导体物理
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2016
·Vol. 43
·期 1
·363-367
·
IF 2.758
Mingchen Sun,Mengfei Sun,Hongxun Yang,Wanghua Song,Yu Nie,Shengnan Sun
One-dimensional porous Fe 2 O 3 nanotubes with 2 µm length, 220 nm outer diameter and 65 nm wall thickness were firstly synthesized via a low temperature hydrothermal method followed by thermal treatment. As advanced anode for lithium ion batteries , porous Fe 2 O 3 nanotubes exhibit obviously enhanced electrochemical properties in terms of lithium storage capacity (1050.1 mA h g −1 at 100 mA g −1 rate), initial coulombic efficiency (78.4%), cycle performances (90.6% capacity retention at 50th cycle), and rate capability (613.7 mA h g −1 at 1000 mA g −1 rate). This enhancement could be attributed to the one-dimensional nanostructure of porous Fe 2 O 3 nanotubes which could increase contact area between electrolyte and active materials, shorten migration path for Li + ions and electrons, and accommodate the volume variations via additional void space during cycling.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机功能材料
✓ 已验证
DOI
高影响因子
Small
·
2021
·Vol. 18
·期 5
·2104508
·
IF 13.281
Jinzhu Wang,Jipeng Hao,Chaomin Duan,Xinchao Wang,Kai Wang,Cheng Ma
Solid-state fluoride-ion batteries (FIBs) circumvent multiple formidable bottlenecks of lithium-ion batteries, but their overall performance remains inferior due to the absence of appropriate solid electrolytes. Presently the conductivity of most solid electrolytes for FIBs is too low to enable room-temperature cycling, while the few sufficiently conductive ones only allow for very low discharge voltages because of the narrow electrochemical stability window (ESW). Here, high room-temperature conductivity and a decent ESW are simultaneously achieved by designing a solid electrolyte CsPb 0.9 K 0.1 F 2.9 . Its room-temperature conductivity is 1.23 × 10 −3 S cm −1 , comparable to the most conductive system reported so far (PbSnF 4 , 5.44 × 10 −4 –1.6 × 10 −3 S cm −1 ), but the ESW is several times broader. With these appealing characteristics simultaneously achieved in the solid electrolyte, a cell with much higher voltages than other room-temperature-operable solid-state FIBs in literature is successfully constructed, and stably cycled at 25 °C for 4581 h without considerable capacity fade.
研究领域:
材料科学
·
电化学
·
固态离子学
·
能源存储
·
无机功能材料
✓ 已验证
DOI
高影响因子
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2016
·Vol. 213
·期 5
·1324-1328
·
IF 1.648
Yongzheng Zhang,Yuxiu Sun,Hao Wang,Hui Yan
Cu 2 ZnSnSe 4 (CZTSe) solar cell with a facile superstrate structure of carbon/CZTSe/CdS/ITO was fabricated entirely by non-vacuum processes. The influence of selenization temperature on the composition of CZTSe layer was briefly investigated. Compared with current superstrate-type CZTS(e) solar cells, the present CZTSe superstrate solar cell exhibited a higher power conversion efficiency of 2.44%.
研究领域:
材料科学
·
光伏技术
·
无机半导体
·
能源材料
·
薄膜器件
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2013
·
IF 3.777
Heng Zhang,Yi Lu,Chang-Dong Gu,Jian-Bin Cai,Xiu-Li Wang,Jiang-Ping Tu
Amorphous Ni–P–C films are fabricated by combining the electrodeposition of Ni–P films from a eutectic-based ionic liquid and the direct current magnetron sputtering of amorphous carbon top-layer. The carbon top-layer with a thickness of about 10 nm is homogeneously coated on the surface of the Ni–P films. A comparison study is undertaken between Ni–P and Ni–P–C films to evaluate the microstructure and the electrochemical performances of the composite films as anode materials for lithium ion batteries , which allow the decoupling of the effect of the carbon layer . It is found that at lower discharge–charge current densities, the cyclability of both Ni–P and Ni–P–C films is similar. As the discharge–charge current density increases, the Ni–P–C film exhibits improved capability and reversibility over the Ni–P film. The Ni–P–C film delivers an initial discharge capacity of 1060 mAh g −1 at 250 mA g −1 and the capacity retention after 50 cycles is 62%, much higher than that of the Ni–P film (51%). The cyclability of Ni–P–C film at different discharge–charge current densities from 200 to 500 mA g −1 is also much better than those of Ni–P film. This study indicates that the introduction of a carbon top-layer on Ni–P film could significantly improve the electrochemical performances due to the decreased interface electric resistance and the structure stability.
研究领域:
材料科学
·
电化学
·
纳米材料
·
能源存储
·
薄膜技术
✓ 已验证
DOI
高影响因子
CATALYSIS TODAY
·
2017
·
IF 4.636
Nianjun Hou,Ping Li,Tianmu Lv,Tongtong Yao,Xueli Yao,Tian Gan,Lijun Fan,Pengzhi Mao,Yicheng Zhao,Yongdan Li
Sm 0.5 Ba 0.5 MnO 3-δ (SBMO) has been synthesized with the Pechini method and investigated as an anode material of solid oxide fuel cells with H 2 and methanol as fuels. A cubic perovskite structure is formed after reduction. The reduction process of SBMO is studied with X-ray photoelectron spectroscopy and temperature programmed reduction techniques. The electrical conductivities of an SBMO sample sintered at 950 °C are 1.15 and 0.10 S cm −1 at 850 °C in air and H 2 , respectively. A single cell with an SBMO anode layer and a 300-μm La 0.8 Sr 0.2 Ga 0.8 Mg 0.2 O 3-δ electrolyte layer exhibits a maximum power density ( P max ) of about 150 mW cm −2 at 850 °C with H 2 as fuel. The electrical conductivity of the anode layer with methanol as fuel is improved by the moderate carbon deposition, and the P max increases to about 415 mW cm −2 . The cell fed with methanol also shows a promising stability.
研究领域:
材料科学
·
能源化学
·
电化学
·
无机非金属材料
·
燃料电池技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）