JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Lei Meng,Bin Yao,Yongfeng Li,Zhanhui Ding,Zhenyu Xiao,Kaisi Liu,Gang Wang
The back contact adhesion is the important factor of the microstructural performance which can determine the optoelectronic properties of the kesterite-based solar cells. Here, we present a rational and effective strategy to significantly enhance the back contact adhesion of Cu 2 (Zn,Cd)Sn(S,Se) 4 (CZCTSSe) absorber layers by insetting the appropriate thickness carbon-doping CZCTS thin films . We chose the oleylamine as the carbon-doping reagent which can generate a small amount of carbon in the annealing process . The suitable thickness carbon-doping CZCTS films can significantly change the crystal growth mechanism of CZCTSSe absorber layers, and eliminate the holes in the back contact. The efficiency of CZCTSSe solar cells fabricated by insetting the appropriate thickness carbon-doping CZCTS films is above 7%, and shows the excellent repeatability and long-term air stability compared with the control devices.
研究领域:
材料科学
·
光伏技术
·
半导体物理
·
表面与界面工程
·
无机功能材料
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 44
·17502-17510
·
IF 3.069
Jie Ren,Zhenguo Wang,Yu Feng,Bangjun Guo,Ke Yu,Ziqiang Zhu
In this work, we report the first-principles investigation and synthesis method for a hollow-MoS2/C heterostructure applied to a hydrogen evolution catalytic material. First principles investigation was used to calculate the free energy of hydrogen ion adsorption at the heterostructure interface at different surface adsorption ratios. The change of the density of states before and after carbon coating proved that carbon coating improves the conductivity of the catalyst. Higher reactivity areas and higher conductivity can significantly improve hydrogen evolution catalytic performance, which is also demonstrated by electrochemical testing. Hollow-MoS2/C exhibits a low onset overpotential of 96 mV and a low Tafel slope of 67.4 mV dec−1, as well as good catalytic stability. The composite catalyst prepared by a two-step method has a larger specific surface area and a larger porosity, can significantly suppress the collapse and stacking effect caused by the electrode circulation process, and improve the cyclic reversibility and stability of the material. This work is expected to provide a meaningful reference for solving the problem of cycling performance degradation of non-precious metal-catalyzed hydrogen evolution materials.
研究领域:
材料化学
·
电化学
·
纳米材料科学
·
催化化学
·
能源材料
·
理论计算化学
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Na Zhang,Yu Liu,Jianhua Yang,Shuming Zhang,Shiyang He
The Si-TiO 2 based composites with a nanosized multi-sphere structure have been developed as novel anode for lithium ion cells . The Si spheres are highly embedded within the titanium dioxide nanoparticles via a hydrothermal synthesis route. The as-proposed sphere-stack like morphology achieves a superior cycling stability for lithium storage. The existence of TiO 2 is in favor for the mechanical stability of Si during charge-discharge and conversely reduces the obtained capacity of the composite. Furthermore, the Si/TiO 2 composite is coated by pyrolysized carbon. The reversible discharge capacity of the Si/TiO 2 /C composite reaches to 976 mAh g −1 after 50 cycles. Carbon coating is beneficial for the rate capability of the Si/TiO 2 based composite.
研究领域:
材料科学
·
电化学
·
纳米科技
·
能源存储
·
无机非金属材料
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2014
·Vol. 16
·期 37
·8910-8916
·
IF 3.858
Feng Ye,Hui Liu,Wenlai Huang,Jun Yang
Controlling the morphology of noble metal nanoparticles can be an effective way to produce nanomaterials with favourable properties. Herein, we report our study on the effects of diffusion rate and reaction kinetics on the morphology of a number of noble metal (Au, Ag, Pd, and Pt) nanoparticles. A glass reactor based on electrochemical reduction or photo-reduction has been designed to achieve control of diffusion and chemical reduction of the different noble metal precursors. The results show that the noble metal nanoparticles with flower-like, core–shell, or wheel-like morphologies could be obtained at a relatively high diffusion rate due to the presence of additional growth of metal precursors on the preformed metal nuclei, while at relatively low diffusion, the as-prepared noble metal nanoparticles are small and quasi-spherical due to the relatively fast reduction of metal precursors. The experimental observations are also confirmed qualitatively by kinetic Monte Carlo (kMC) simulations. Since diffusion and reaction kinetics are universal and key factors in the synthesis of nanomaterials, the findings in this work might provide an effective way to manipulate the morphology of nanomaterials for a given application.
研究领域:
纳米材料科学
·
物理化学
·
材料合成
·
胶体与界面化学
·
计算材料学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Hui Wang,Houzhen Chen,Hongjiao Wang,Lei Wu,Qixing Wu,Zhongkuan Luo,Fang Wang
The electrochemical performance of the lithium−oxygen (Li−O 2 ) batteries largely depends on the material and architecture of the catalytic cathode. In this paper, to avoid the parasitic reactions of carbon and binder with discharge products and reaction intermediates, we proposed an effective design of a free-standing catalytic cathode for Li−O 2 batteries. The FeCo 2 O 4 @Ni electrode consists of FeCo 2 O 4 nanosheets grown directly on nickel (Ni) foam. The resultant hierarchical macroporous/mesoporous structure provides sufficient space for the insoluble discharge product Li 2 O 2 and catalytically active sites for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER). Consequently, the carbon- and binder-free self-supporting electrode has demonstrated a high discharge capacity with relatively low charge overvoltage and a better cycle performance than the corresponding carbon-based electrodes.
研究领域:
电化学
·
能源材料
·
纳米材料
·
电催化
·
储能技术
✓ 已验证
DOI
高影响因子
ORGANIC ELECTRONICS
·
2019
·
IF 3.495
Xiangli Gao,Gaoyi Han,Yunzhen Chang,Ying Zhang,Honggang Li
To enhance the reduced graphene oxide hydrogels' capacitive performance, many modifiers are used to add doped element into the materials and improve the structure. The isomers of aminophenol which contain amino and hydroxyl groups on the benzene ring are employed as structure regulator and modifier to synthesize high-performance reduced graphene oxide hydrogels. The influences of preparation conditions including ratios of graphene oxide to aminophenol isomers, temperature, reaction times on the samples’ structure and properties have been investigated. The results show that the oligomer of o-aminophenol is formed on reduced graphene oxide sheets while the molecules of p, m-aminophenol are bound to the sheets; and that the hydrogel prepared in the presence of p-aminophenol has larger specific surface area, total pore volume , specific capacitance and good rate capability (74.0% of 427.0 F g −1 retains at 100 mV s −1 ) than other. The cells assembled by the optimized hydrogels exhibit the energy density of 14.07 Wh kg −1 at power density of 124.3 W kg −1 , and 4.96 Wh kg −1 at 6.78 kW kg −1 . Furthermore, 92.2% of initial capacitance can be retained after 20,000 cycles for the cells assembled by the optimal hydrogel. This kind of material may be found its use in energy storage field.
研究领域:
材料科学
·
纳米科技
·
电化学
·
能源存储
·
高分子化学
·
表面科学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2020
·
IF 16.602
Qingyan Zhou,Zhen Zhang,Jiajun Cai,Bing Liu,Yunlong Zhang,Xiaofei Gong,Xulei Sui,Aiping Yu,Lei Zhao,Zhenbo Wang,Zhongwei Chen
Rational design and construction of highly efficient and durable non-noble-metal bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is crucial to promote the widespread implementation of rechargeable Zn-air batteries. Herein, a bifunctional catalyst comprising Co nanoparticles uniformly embedded in hollow nitrogen doped carbon tubes (Co@hNCTs) is fabricated by a facile tube-directed templating strategy. In this strategy, surfactant-treated polypyrrole (PPy) nanotubes serve as the structure-guiding templates for efficient capture of Co 2+ , realizing the in-situ growth of zeolitic imidazolate frameworks-67 (ZIF-67) nanocrystals on PPy nanotubes . Sodium laurylsulfonate acts as anionic surfactant to endow PPy nanotubes with functional electronegative surface and strong anchoring effect toward ZIF-67, playing the pivotal role in binding of ZIF-67 nanocrystals with PPy nanotubes potently. Consequently, the developed catalyst presents a superior ORR activity with the half-wave potential of 0.87 V excellent durability with only a 7 mV loss of half-wave potential after 5000 cycles. The catalyst also exhibits superior catalytic performance for OER. When serving as an air electrode in Zn-air batteries, a large power density of 149 mW cm −2 and long-term cyclability for over 500 h are realized in ambient air, implying the great potential in practical application.
研究领域:
材料科学
·
电化学
·
能源存储
·
催化化学
·
纳米材料
✓ 已验证
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Hedong Chen,Zhoulu Wang,Xianhua Hou,Lijun Fu,Shaofeng Wang,Xiaoqiao Hu,Haiqing Qin,Yuping Wu,Qiang Ru,Xiang Liu,Shejun Hu
Carbon-coated core-shell structure artificial graphite@plasma nano-silicon@carbon (AG@PNSi@C) composite, applying as lithium ion battery anode material , has been prepared via spray drying method. The plasma nano-silicon (<100 nm), which contained amorphous silicon , was synthesized by radio frequency induction plasma system with the high temperatures processing capability and high quench rates. The artificial graphite in the composite acts as the core which supports the particle and provides electroconductivity , while PNSi attached on the surface of the core, enhances the specific capacity of the composite. The as prepared composite shows superior performance as anode in lithium-ion batteries, regarding to the initial Coulombic efficiency and cycle life. The initial Coulombic efficiency of AG@PNSi@C electrode is 81.0% with a discharge capacity of 553 mAh g −1 and a recharge capacity of 448 mAh g −1 . During cycling, AG@PNSi@C exhibits excellent performance with a very low capacity fading that the discharge capacity maintains 498.2 mAh g −1 and 449.4 mAh g −1 after 250 cycles and 500 cycles. AG@PNSi@C also shows enhanced resistance against high current density . Besides the remarkable electrochemical performances , the facile and mass-producible synthesis process makes the AG@PNSi@C composite very promising for its application in lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 17
·7911-7920
·
IF 2.7
Pengchao Liang,Yuanchao Li,Xiangzhen Xiao,Shumin Fan,Jingjing Ma,Jingjie Liu,Yongqiang Dong,Yuhang Zong,Guangri Xu,Li Yang
Although they possess a high working voltage and environmental compatibility, and are low in cost with abundant resources, the poor cycling performance and rapid capacity attenuation of LiMn2O4 cathodes at high temperature restrict their extensive application. In this study, LiMn2O4 materials are synthesized by a simple rheology-assisted solid-phase method using citric acid as an additive. The citric acid improves the uniformity of the mixed raw materials, resulting in a reduction in particle agglomeration. Consequently, the synthesized LiMn2O4 shows an initial capacity of 117.4 mA h g−1 with a capacity retention of 79.50% at 2C after 300 cycles and 54.78% of the initial discharge capacity at 20C. This work provides a strategy for modifying multicomponent transition metal oxides for advanced lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
·
无机固体化学
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2015
·
IF 6.217
Zhantao Liu,Xusong Qin,Hui Xu,Guohua Chen
In this study, a one-pot sintering process incorporating sol–gel preparation route and in-situ carbon coating was proposed for the synthesis of carbon-coated nanosized LiTi 2 (PO 4 ) 3 . Experimental results show that the prepared LiTi 2 (PO 4 ) 3 particles are of high crystallinity and well-coated by turbostratic carbon. Attributed to nanosized particles and enhanced conductivity provided by turbostratic carbon coating, the carbon-coated LiTi 2 (PO 4 ) 3 showed high rate performance and good cycling life in aqueous electrolyte. Particularly, the carbon-coated LiTi 2 (PO 4 ) 3 exhibited initial specific capacities of 103 and 89 mAh g −1 , and retained 80.6% and 97% of the initial capacities after 120 cycles at 1C and 10C in aqueous electrolyte, respectively. The high rate performance and good cycling life of carbon-coated LiTi 2 (PO 4 ) 3 in aqueous electrolyte reveal its potential as negative electrode in aqueous lithium-ion batteries for electric vehicles and industrial-scale energy storage systems .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米技术
·
无机化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 12
·期 17
·10260-10268
·
IF 10.7
Yingfen Li,Xingye Chen,Runxi Wang,Nian Zhou,Fang Huang,Jun Zhao,Zhenghua Su,Shuo Chen,Guangxing Liang
In this study, Sb2S3 was introduced into the two-step selenization process to promote bottom grain growth and reduce the surface roughness of the Cu2ZnSn(S,Se)4 light-absorber layer. The introduction of Sb doping in Cu2ZnSn(S,Se)4 can passivate bulk and interface defects and a small conduction band offset (CBO) can be found, which facilitate the improvement of heterojunction carrier transport properties. Similarly, simulations illustrated that Sb doping improved device efficiency by controlling bulk and interface defects and band alignment. This optimized method facilitated the penetration of Sb, resulting in a high-quality CZTSSe absorber layer. Ultimately, the research culminated in a significant enhancement, yielding a solar cell with an impressive efficiency of 13.11%. These findings offer new possibilities for kesterite solar cells and advance the potential of CZTSSe materials in thin film photovoltaic applications.
研究领域:
材料科学
·
光伏技术
·
半导体物理
·
薄膜太阳能电池
·
无机功能材料
·
固态电子学
✓ 已验证
DOI
高影响因子
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2016
·Vol. 18
·期 10
·7341-7348
·
IF 4.449
Xiong Liu,Dong Wang,Hong Gao,Zhou Yang,Yan Xing,Hui Cao,Wanli He,Huihui Wang,Jianming Gu,Huiying Hu
A novel kind of monodonor–bisacceptor (D–A–A) C60 charge-transfer complex was synthesized by the high-yielding [2+2] click chemistry reaction and the Prato reaction. Both electrochemical and UV-vis spectra studies were carried out and they proved that the side groups of the fullerene derivatives played an important role in the energy gaps, and also affected the third-order non-linear optical response. The experimental investigation on the third-order non-linear optical phenomena of the fullerene derivatives was measured using the Z-scan technique at different wavelengths (532 nm and 1064 nm). All the compounds exhibited very special non-linear optical properties when pumped by 21 ps pulses at 532 nm which suggested that there were two different types of reversible photo-isomerization. The optical-limiting performance has also been studied which proved indirectly the mechanism models of the reversible photo-isomerization.
研究领域:
材料科学
·
光学工程
·
纳米化学
·
非线性光学
·
功能材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）