JOURNAL OF ELECTRONIC MATERIALS
·
2020
·Vol. 49
·期 3
·2159-2163
·
IF 1.774
Wang Yan,Wang Yishu,Ma Limin,Han Jing,Guo Fu
Because of its tetragonal structure, β -Sn exhibits anisotropy in electromigration behavior. The diffusivity of Cu atoms along the c -axis of Sn is much faster than that along the a -axis; therefore, the orientation of the c -axis exerts a strong influence on Cu atomic motion. In this work, the effect of Sn grain c -axis on Cu atomic motion was investigated by using Cu reinforced Sn3.5Ag composite solder joints. The microstructure and morphology of the solder joints were characterized by scanning electron microscopy (SEM) equipped with a backscattered electron (BSE) detector. It was found that intermetallic compounds (IMCs) in the solder matrix were formed due to the migration of Cu atoms to the surface of the solder joint under current stressing. There was a large amount of IMCs on the solder matrix which protruded from the solder matrix. By changing the direction of electron flow, i.e. changing the anode and the cathode side, the IMCs which formed after current stressing in the solder matrix disappeared and the protruding Sn remained unchanged. The results revealed that the growth of IMCs was closely related to the migration of Cu atoms, while Cu atomic motion depended on the orientation of the Sn grain c -axis.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 25
·11524-11534
·
IF 3.553
Han Qigang,Zhang Wenqiang,Geng Di,Li Yao,Zhang Xu,Han Zhiwu
A tin dioxide/carbon composite (SnO 2 @C) with controlled shape is fabricated using a two-step method, which includes preparation of SnC 2 O 4 precursors and subsequent heat treatment process. SnC 2 O 4 precursors with different morphologies are synthesized by controlling the different proportions of tin sources, and some characterization techniques are carried out to screen out the optimum precursors. And the precursors are further annealed to obtain nanostructured SnO 2 and coated with carbon film. Ultimately, shape-controlled SnO 2 @C anode materials are prepared, and the reaction process and electrochemical properties of SnO 2 @C composites as anode materials are further studied. The SnO 2 @C composite shows the capacity of 659.4 mAh g −1 after 100 cycles at a current density of 100 mA g −1 . Even at the rate of 2000 mA g −1 , the composite electrode can maintain a reversible capacity of 507.2 mAh g −1 . The excellent electrochemical performance is beneficial to the synergistic effect between the carbon coating film and the nanostructured SnO 2 , which provides sufficient lithium storage sites, good electronic conductivity and void space to relieve the volume expansion.
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Yuanjing Meng,Muhammad Akbar,Jie Gao,Manish Singh,Te-Wei Chiu,Baoyuan Wang,Chen Xia,Liangdong Fan
Insufficient ionic conductivity of electrolyte materials and high manufacturing costs create bottlenecks in the commercialization of low-temperature solid oxide fuel cells (LT-SOFCs). Developing the semiconductor-ionic electrolyte represents a new research strategy for high-performance LT-SOFCs because of their attractive ion conduction and associated low polarization loss. In this study, a self-assembly approach is demonstrated by incorporating ABO 3 perovskite La 0.7 Sr 0.3 Cr 0.5 Fe 0.5 O 3-δ (LSCrF) into the fluorite structure CeO 2 , for developing 1LSCrF-xCeO 2 composite as semiconductor-ionic heterostructure for LT-SOFCs with superior electrochemical efficiency at the temperature below 550 °C and even down to 370 °C over unmodified and mechanically mixed samples. Self-assembly enables abundant nanoscale hetero-interfaces accompanied by widely distributed oxygen vacancies , which leads to the superior ionic conductivity of 0.018–0.112 S cm −1 , lower activation energy of 0.54 eV and better peak power density of 136–735 mW cm −2 over control samples at 370–550 °C, and stable operation for 50 h of resultant LT-SOFCs under a galvanostatic mode. This work highlights the important role of self-assembly in designing heterostructural semiconductor based electrolytes for high-performance LT-SOFCs.
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 11
·4295-4303
·
IF 3.288
Chao Wang,Xing Li,Yuzhou Liu,Nan Gao,Xing Xin
In this work, BaLi2Ti6O14 nanofibers coated by a thin carbon layer were rationally designed and synthesized by a controlled electrospinning process and a simple annealing process. The carbon content of the composite is as low as 1.91 wt%. This thin carbon layer is considered to contribute to remarkably improving the rate capability. Furthermore, BaLi2Ti6O14@C nanofibers can deliver a high reversible capacity of 95.0 mA h g−1 with a capacity retention of 83.4% at a high current density of 1000 mA g−1 after 800 cycles. Analysis of the electrochemical results showed that the existence of the carbon coating layer plays a positive role in improving the structural stability and ionic transport of BaLi2Ti6O14 during the charge/discharge processes, thereby indicating a general method for improving the electrochemical performance of electrode materials with poor electrical conductivity.
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Li-Ping Yang,Yang Wang,Xue-Qing Zhao,Xi-Jie Lin,Bei-Bei Zhang,Yong-Gang Sun,Song Chen
Hollow structure has great potential in lithium-ion batteries, especially in Si-based anode materials . Unlike the usual templating process, here, we report a template-free synthetic strategy to build hollow microspheres of Si-C hybrid materials , which combines an in-situ polymerization process to form precursor and magnesiothermic reduction towards the inner cavity. As a result, the hollow Si-C microspheres exhibit improved cycling performance (768.7 mA h g −1 after 100 cycles at 0.84 A g −1 ) and good rate capability (497.1 mA h g −1 at 8.4 A g −1 ) when used as an anode material in lithium-ion batteries. This work provides a controllable and industrially-scalable operation based on cheap source to synthesize hollow Si-C hybrid materials, which combines the advantage of hollow structure and carbon matrix to achieve better electrochemical performance than the solid one.
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2024
·
IF 7.2
Wei Zeng,Yao Tian,Xuehua Dong,Ling Huang,Hongmei Zeng,Zhien Lin,Guohong Zou
Birefringent crystals are extensively utilized across diverse optical applications due to their unique property of splitting incident light into dual refracted rays, thereby modulating and controlling light polarization. The pursuit of promoting the birefringence of such crystals to facilitate device miniaturization has recently emerged as a prominent area of focus. In this investigation, we introduce two molybdenyl iodates, namely, C(NH2)3MoO3(IO3) and Rb2MoO2(I2O6)(IO3)2, conceived through a “cation–anion synergetic interaction” strategy. Each compound exhibits a one-dimensional chain structure. Despite processing similar wide band gaps (3.33 and 3.22 eV), these materials display a variance in their birefringence (Δn = 0.426 and 0.261 @546 nm). Notably, C(NH2)3MoO3(IO3) showcases the highest birefringence among all hitherto reported molybdenyl iodates, signifying its potential as a high-performance birefringent crystal. Theoretical analyses indicate that the C(NH2)3+ cation, acting as a birefringence-active unit, significantly bolsters the birefringence of molybdate iodates. Moreover, the presence of extensive hydrogen-bonding interactions between C(NH2)3+ cations and iodates influences the orientation of the highly anisotropic iodates, thereby further enhancing the birefringence of C(NH2)3MoO3(IO3). This research paves the way for the future exploration of organic–inorganic hybrid molybdenyl iodates exhibiting exceptional optical performance.
✓ 已验证
DOI
高影响因子
JOURNAL OF ORGANIC CHEMISTRY
·
2024
·
IF 3.3
Jin Yan,Suijie Zhong,Xu Chen,Yihuan Luo,Hua Cao,Xiang Liu,Limin Zhao
Here, we report controlled and site-selective C–H alkenylation and dialkenylation of indolizines and pyrrolo[1,2-a]quinolines with β-alkoxyvinyl trifluoromethylketones under simple and practical conditions. Moreover, this direct C–H alkenylation strategy can also be extended to imidazo[1,2-a]pyridines. Notably, without a transition metal and external oxidant, efficient dehydrogenative β-alkenylation of tertiary amines with β-alkoxyvinyl trifluoromethylketones is presented.
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Ying Pan,Congying Rao,Xiaolin Tan,Yun Ling,Ayushi Singh,Abhinav Kumar,Baohong Li,Jianqiang Liu
Rational designing of carbon-based adsorbent precursors is an important way to enhance adsorption performance. In this work, fascinating Co@C composites have been designed and fabricated using a new cobalt-seamed metal–organic nanocapsule (Co-MONC), which exhibits incredibly high adsorption capacity for chlorpromazine (CPZ) removal from aquatic environments. Benefiting from its interconnected micro- and mesoporous structures, well-dispersed and highly available Co adsorption active sites, the optimal Co@C-900 exhibits ultrahigh CPZ adsorption capacity (1039.53 mg g −1 ) and excellent recycling ability, outperforming the reported porous materials and commercial activated carbon. Moreover, the adsorption behaviors of CPZ for the composite have been comprehensively investigated and the plausible adsorption mechanism was proposed. Apart from this, the interaction mechanism between exposed Co adsorption active sites and CPZ have been suggested with the aid of density functional theory (DFT) calculations. The presented investigation demonstrated a facile and designable strategy for the fabrication of highly effectively adsorbents for organic contaminant removal.
✓ 已验证
DOI
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Yehui Guan,Mingjun Dai,Tong Liu,Yingwei Liu,Fangmeng Liu,Xishuang Liang,Hui Suo,Peng Sun,Geyu Lu
A fuel-cell-type gas sensor based on the membrane electrode assemble (MEA) composed of proton exchange membrane (Nafion) and Pt/C sensing electrodes was fabricated for detection of CO at room temperature . The Pt/C electrodes materials were synthesized from Vulcan XC-72 carbon powders and hexachloroplatinic acid (H 2 PtCl 6 ). This paper mainly focused on the effect of various dispersants (ethylene glycol (EG) tetraethyl orthosilicate (TEOS), glycerol and EG/polytetrafluoro-ethylene (PTFE)) on the performance of the presented sensor. Results revealed that the sensor utilizing EG as the dispersant elicited the highest response current toward 50 ppm CO. The current of the sensor was linearly correlated with CO concentration in the range of 1–200 ppm, which sensitivity was 88 nA/ppm. In addition, the 90% response and recovery times of the sensor toward 50 ppm CO were 22 and 24 s, respectively. Besides, the prepared CO sensor also had a good repeatability and acceptable selectivity.
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Runrun Cheng,Yan Wang,Xiaochuang Di,Zhao Lu,Ping Wang,Mingliang Ma,Jinrui Ye
Nowadays, facing the inevitable electromagnetic (EM) pollution caused by many electronic products, it is urgent to develop high-performance microwave absorbing materials. In particular, the bimetallic carbon-based composites derived from MOFs exhibit excellent microwave absorption potential due to their simple preparation, low cost, adjustable morphology and magnetoelectric synergy mechanism. In this work, we successfully prepared plum-like NiCo@C composite by simple solvothermal method and carbonization treatment, which displays strong absorption (-55.4 dB) and wide effective absorption band (EAB, 7.2 GHz) when the loading is 20 wt%. The plum-like structure greatly enriches the non-uniform interface and the structural anisotropy contributes to the dissipation of electromagnetic waves . At the same time, the band hybridization and magnetic coupling of NiCo@C contribute to the coordination of EM characteristics. Overall, this work proves the feasibility of NiCo@C hierarchical composite in the field of microwave absorbing, and provides insight for the development of high-performance absorbers.
✓ 已验证
DOI
高影响因子
ChemSusChem
·
2022
·Vol. 15
·期 8
·e202200075
·
IF 9.14
Jun Zheng,Chenyang Zhan,Kai Zhang,Wenwu Fu,Qiaojun Nie,Ming Zhang,Zhongrong Shen
Graphical Cellmates : A zinc-ion battery cell is constructed with V 2 O 3 @C as the cathode and a “water-in-salt” electrolyte. Electrochemically induced oxidation of V 2 O 3 @C into amorphous V 2 O 5 with in situ Zn 2+ and H 2 O co-insertion leads to excellent cycling and rate performances. Systematic improvement of this architecture indicates significant promise for practical application. Aqueous Zn-ion batteries (ZIBs), with the advantages of low cost, high safety, and high capacity, have great potential for application in grid energy storage and wearable flexible devices. However, their commercial application is still restricted by their inferior long-term cycling stability, Zn dendrite formation, and the decomposition of aqueous electrolyte. In this study, a Zn|Zn(CF 3 SO 3 ) 2 +LiTFSI|V 2 O 3 @C cell is constructed to address the above issues. The V 2 O 3 @C electrode can be fully oxidized into amorphous V 2 O 5 @C simultaneously with Zn 2+ and H 2 O co-insertion. The cell delivers a high specific capacity of more than 240 mAh g −1 at 3 A g −1 , with extraordinary coulombic efficiency and capacity retention. The excellent electrochemical performances are attributed to synergistic effects between the V 2 O 3 @C electrode and the water-in-salt electrolyte with enhanced stability and improved interface reaction kinetics. Systematic improvements of this architecture indicate much promise for application.
✓ 已验证
DOI
高影响因子
Small
·
2022
·Vol. 18
·期 39
·2203459
·
IF 15.153
Qing Sun,Maoxiang Yang,Guifang Zeng,Jing Li,Zhibiao Hu,Deping Li,Shang Wang,Pengchao Si,Yanhong Tian,Lijie Ci
Tin chalcogenides are regarded as promising anode materials for potassium ion batteries (PIBs) due to their considerable specific capacity. However, the severe volume effect, limited electronic conductivity, and the shuttle effect of the potassiation product restrict the application prospect. Herein, based on the metal evaporation reaction, a facile structural engineering strategy for yolk–shell SnSe encapsulated in carbon shell (SnSe@C) is proposed. The internal void can accommodate the volume change of the SnSe core and the carbon shell can enhance the electronic conductivity. Combining qualitative and quantitative electrochemical analyses, the distinguished electrochemical performance of SnSe@C anode is attributed to the contribution of enhanced capacitive behavior. Additionally, first-principles calculations elucidate that the heteroatomic doped carbon exhibits a preferable affinity toward potassium ions and the potassiation product K 2 Se, boosting the rate performance and capacity retention consequently. Furthermore, the phase evolution of SnSe@C electrode during the potassiation/depotassiation process is clarified by in situ X-ray diffraction characterization, and the crystal transition from the SnSe Pnma(62) to Cmcm(63) point group is discovered unpredictably. This work demonstrates a pragmatic avenue to tailor the SnSe@C anode via a facile structural engineering strategy and chemical regulation, providing substantial clarification for the phase evolution mechanism of SnSe-based anode for PIBs.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）