ELECTROCHIMICA ACTA
·
2015
·
IF 4.504
K. Huang,K. Bi,J.C. Xu,C. Liang,S. Lin,W.J. Wang,T.Z. Yang,Y.X. Du,R. Zhang,H.J. Yang,D.Y. Fan,Y.G. Wang,M. Lei
Novel nanocomposites of spherical graphite-carbon encased tungsten carbide (GC-WC) are synthesized by solid state reaction with melamine and WO 3 as precursors under N 2 atmosphere. The diameters of the GC-WC composites range from 50 to 200 nm and the WC nanoparticles inside with an average size of ca. 15 nm distribute uniformly. The characterization results indicate that the GC-WC is composed of few layers of graphite carbon and WC nanoparticles with high crystallization and purity. Moreover, the electrocatalytic performance of GC-WC for the oxygen reduction reaction (ORR) in alkaline medium is further investigated by cyclic voltammetry (CV), rotating disk electrode (RDE) and chronoamperometry test with or without 3 M methanol. The results show that GC-WC has a considerable performance for ORR in the view of activity, stability and methanol tolerance, which may further used as proper supports for noble-metal based ORR catalysts in alkaline fuel cell . The synergetic interaction between the carbide nanoparticles and graphite carbon, which means that the surface graphite carbon layers are activated by WC nanoparticles for ORR and in turn protect inner WC from highly oxidizing environments has also been verified.
研究领域:
材料科学
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纳米科技
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电化学
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能源材料
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催化化学
✓ 已验证
DOI
高影响因子
SOLID STATE IONICS
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2018
·
IF 2.751
Wenping Zha,Yinghui Xu,Fei Chen,Qiang Shen,Lianmeng Zhang
In this work, Li 7 La 3 Zr 2 O 12 (LLZO)-based membrane electrolyte, which has good flexibility and can be easily mass-produced, is proposed to address the intrinsic defects of ceramic electrolytes . The LLZO-based membrane electrolyte is electrochemically stable in the voltage range of 0–5.2 V vs. Li/Li + due to the good oxidative stability of LLZO. We also develop a simple and low-cost approach to fabricate the all-solid-state lithium battery (ASSLB). Wet coating and hot pressing are applied to form a continuous and homogeneous electrolyte layer on a cathode layer. Thanks to the integrated preparation process, there is no obvious interface between the cathode layer and the electrolyte layer, hence reducing the interface resistance. The Li/LiFePO 4 batteries exhibit desirable cycling performance at 60 °C, which deliver a maximum discharge specific capacity of 151.6 mAh·g −1 at 0.1C and maintain 97.8% of the capacity after 50 cycles.
研究领域:
材料科学
·
电化学
·
能源存储
·
固态离子学
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先进电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Tianjiang Sun,Qingshun Nian,Shibing Zheng,Xuming Yuan,Zhanliang Tao
Aqueous zinc-ion batteries (ZIBs) are gaining widespread attention owing to their intrinsic safety and low cost. However, it is still a challenge that finding robust cathode materials to build a high-energy-density aqueous ZIBs. Here, we synthesize a novel layered K 0.41 MnO 2 ·0.5H 2 O (KMO) cathode material for aqueous ZIBs. The constructed Zn//KMO battery shows an ultrahigh discharge capacity of 425 mAh g −1 and a remarkable energy density of 503 Wh kg −1 at 175 mA g −1 , as well as an good durability over 1500 cycles with no obvious capacity fading. A comprehensive study suggests that the water molecules can intercalate into layered KMO with H + and Zn 2+ ions during discharging process. The co-intercalating water not only facilitates ions insertion, but serves as pillars to stabilize the structure of KMO. This work demonstrates the mechanism about water cointercalation and provides a way for designing high-energy-density aqueous ZIBs.
研究领域:
电化学储能
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材料科学
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能源化学
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无机化学
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电池技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 33
·18690-18697
·
IF 2.936
Qian Liu,Zijie Xu,Wu Qiu,Chen Hou,Yanan Wang,Peijian Yao,Rui Yu,Wenxi Guo,Xiang Yang Liu
Ultraflexible electronics have received extensive attention due to their favorable properties, such as superior mechanical robustness, light weight and good compatibility with large-area roll-to-roll fabrication. Here we present a flexible sandwiched tungsten trioxide/silver nanotrough network/poly(3,4-ethylenedioxythiophene)–poly(styrene sulfonate) multi-layer transparent conducting electrode with prominent conductivity (sheet resistance as low as 1.08 Ω sq−1) and transparency (85%). In particular, the flexible transparent electrode exhibits excellent mechanical robustness upon bending and stretching. This hybrid electrode can be further adhered tightly to a layer of WO3 to form an electrochromic device, which simultaneously displays a rapid switching time (0.75 s/1.82 s for bleaching/coloring) and high cyclic performance (86% retention of the initial optical contrast after cycling for 30 000 s). In addition, our electrode can also be fabricated on various flexible substrates, such as polyethylene cling wrap, polydimethylsiloxane and Ecoflex, with sustained electrochromic properties after bending, twisting, stretching and even strong kneading. Our work provides new opportunities for the next generation of flexible and wearable electronics applied on various flexible substrates.
研究领域:
材料科学
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纳米科技
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柔性电子学
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功能材料
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电化学
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高分子材料
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器件物理
✓ 已验证
DOI
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 44
·24900-24905
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IF 2.936
Yanjie Wang,Chun Fang,Ying Huang,Qing Liu,Ruirui Zhao,Xuli Ding,Yunhui Huang
Organic compounds have been utilized in rechargeable batteries as electrode materials on account of their designable structures and reversible redox properties. However, most of them suffer from problems with dissolution resulting in poor electrochemical performance. In this work, we adapt a sodium salt of tetracyanoquinodimethane (NaTCNQ) to work as a high redox potential cathode material in sodium ion batteries (SIBs). A porous carbon coated separator is demonstrated to be an adsorption layer and prevents the dissolved active material from migrating to the anode side. The NaTCNQ cell assembled with a carbon layer containing 5% activated carbon (AC) exhibits a higher initial capacity and greatly improved cycling stability. Using a conductive adsorption layer in organic redox batteries is a promising pathway to develop high performance organic electrode materials for SIBs.
研究领域:
电化学
·
能源材料
·
纳米材料
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电池技术
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功能材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yiheng Yue,Guocheng Pan,Jun Wan,Zhen Xiao,Yang Zhang,Shiqing Xu,Gongxun Bai
Mechanoluminescent (ML) materials offer significant potential for remote stress sensing and distribution. However, creating highly sensitive and responsive ML materials remains a challenge. In this study, mechanoluminescent semiconductor materials have been successfully prepared as Mn 2+ doped ZnS-SrZnOS heterojunction composites. These materials exhibit high-resolution stress distribution visualization and rapid response, captured via camera recording. Notably, they possess a low stress triggering threshold, reaching the KPa level, and respond within milliseconds. Furthermore, it was found that by adjusting the doping concentration of Mn 2+ within the heterojunction, the material utilizes its bimodal emission capability to manipulate the fluorescence shift and achieve optical anti-counterfeiting. The synthesis of smart films by combining the material with polydimethylsiloxane matrix had enabled the achievement of collision detection, information hiding and optical anti-counterfeiting. These results suggest that the prepared smart films have wide range of optical sensing applications.
研究领域:
材料科学
·
纳米科技
·
光学传感
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功能材料
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固态物理
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表面与界面科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2018
·
IF 6.578
Xinming Du,Zhe Wang,Wenchang Liu,Jingmei Xu,Zhaoyu Chen,Chunmei Wang
A series of phenolphthalein-based poly (arylene ether ketone) (PEK) copolymer are synthesized to prepare anion exchange membranes (AEMs). The ion group 1-vinyl imidazole is introduced on the unit of phenolphthalein-based as a hydrophilic segment and cross-linking agent. The structure of resulting membranes was investigated by 1 H NMR and FT-IR. The well-defined microphase-separated structures were verified by TEM and SAXS profiles. The cross-linked membrane of ImPEK-0.4 exhibits high hydroxide conductivity (0.0836 S/cm, at 80 °C), excellent mechanical performance (69.6 MPa) and the maximum swelling ratio is only 7.95% at 80 °C. Furthermore, the excellent alkaline stability is demonstrated by immersing the prepared membrane in 1 M NaOH at 40 °C for 400 h. The ionic conductivity is still high to 0.0381 S/cm for ImPEK-0.4. These results indicate that combining phase separation architecture and crosslinking may possess potential applications for alkaline fuel cells (AFCs).
研究领域:
高分子材料科学
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电化学能源材料
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燃料电池技术
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膜分离工程
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聚合物化学
✓ 已验证
DOI
高影响因子
POWDER TECHNOLOGY
·
2018
·
IF 3.23
Zhilin Xi,Liwei Jin,J.Y. Richard Liew,Ding Li
A foam sol clay (FSC) mixture, mainly composed of fly ash (FA), surfactant ( n -amylamine) and polyethylene oxide (PEO), was proposed for coal dust control. The FA surface, modified by a FSC solution, stability and foamability were investigated. It was found that the FA surface in alkaline solution was deprotonated to form a negative charge, which could be adsorbed by the polar head group of n -amylamine via electrostatic interactions . As a result, with increasing surfactant, the particles gradually converted from hydrophilic to hydrophobic and attached at gas-liquid interfaces so that the contact angle, zeta potential , froth stability and foamability increased. At a surfactant concentration (c a ) of 35 g/L, a monolayer three-dimensional network was formed and the maximum foamability and half-life were obtained. Upon further increasing c a , a bilayer and particle clusters were formed by surfactant chain-chain interaction, resulting in particles becoming hydrophilic again, and the FSC solution having stronger mechanical resistance against flowing, so that the viscosity rapidly increased and the diffusion of free surfactant molecules was hindered at the froth surfaces. Thus, the contact angle, froth stability and foamability decreased. PEO could bond sodium dodecyl sulfate and water to form a dual adsorption layer and hydrogen, respectively, which enhanced the wettability of the FSC on coal dust surfaces. PEO could adsorb and curl FA particles to form a thin layer of armor after froth air-drying. It was concluded that the froth generated by the FSC solution, including 200 g/L FA, 35 g/L c a and 1 g/L PEO, could control coal dust with a long-term effect.
研究领域:
环境工程
·
矿物加工
·
胶体与界面化学
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粉尘防治
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资源利用
✓ 已验证
DOI
高影响因子
DIAMOND AND RELATED MATERIALS
·
2019
·
IF 2.29
Qiuying Chang,Hao Zhang,Rongqin Gao
A new nanocomposite was prepared by combining Magnesium silicate hydroxide (MSH) with decomposed gelatin under one-pot hydrothermal synthesis conditions. The chemical reaction process involved the MSH formation and the gelation decomposing into carbonaceous species. The characterization of resultant nanoparticles revealed that the nanocomposite was a combination of hydrogenated amorphous carbon and MSH. And the addition of gelatin during synthesis increased the content of granular nanoparticles in nanocomposite samples. The results of tribological experiments of MSH modified by carbon (MSH@C) as lubricant additive showed that the nanocomposites presented much better anti-wear property and friction stability than the MSH without modification. Thus MSH@C nanocomposites were expected to be a promising candidate for lubricant additives. The amorphous carbon film was detected on the wear scar which might account for the significant tribological property.
研究领域:
材料科学
·
纳米科技
·
表面工程
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摩擦学
·
复合材料
✓ 已验证
DOI
高影响因子
Nano Energy
·
2016
·
IF 11.553
Jingxian Zhang,Ning Zhao,Miao Zhang,Yiqiu Li,Paul K. Chu,Xiangxin Guo,Zengfeng Di,Xi Wang,Hong Li
Solid-state electrolytes with high ionic conductivity , large electrochemical window, good mechanical properties , and easy processability are needed for high-energy solid-state lithium batteries . In this work, composite membranes consisting of lithium garnet (i.e. Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 , LLZTO) particles and Li-salt-free polyethylene oxides (PEOs) are produced as solid-state electrolytes. Li-ion-conducting particles in nano-scale are crucial for the enhancement of conductivity and the membranes containing ~40 nm LLZTO particles exhibit conductivities nearly two orders of magnitude larger than those with the micro-scale ones, which is attributed to the difference in specific surface area related to the percolation effect. Compared to the conventional PEO doped with lithium salt, the insulating PEO in PEO:LLZTO membrane electrolyte is conducive to the suppression of lithium dendrite growth owing to prohibition of current flow. With PEO:LLZTO membrane electrolytes in conductivity of 2.1×10 −4 S cm −1 at 30 °C and 5.6×10 −4 S cm −1 at 60 °C, the solid-state LiFePO 4 /PEO:LLZTO/Li and LiFe 0.15 Mn 0.85 PO 4 /PEO:LLZTO/Li cells deliver energy densities of 345 Wh kg −1 (662 Wh L −1 ) and 405 Wh kg −1 (700 Wh L −1 ) (without the package weight or volume) with good rate capability and cycling performance. This study suggests that the conjunction of nano-scale Li-ion-conducting particles and an insulating polymer provides a promising solution to produce powerful solid-state electrolytes for high-performance solid-state lithium batteries .
研究领域:
材料科学
·
电化学
·
能源存储
·
高分子科学
·
固态电池技术
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
·
2017
·Vol. 45
·期 6
·830-836
·
IF 0.795
Hong-Cai ZHAO,Pu ZHANG,She-Hong LI,Hong-Xia LUO
A large area graphene platform electrode (GPE) was fabricated by transferring chemical vapor deposition (CVD) grown graphene on Cu foils onto polyethylene terephthalate (PET) substrates with the aid of polymethyl methacrylate (PMMA). Cobalt hexacyanoferrate (CoHCF) was electrodeposited on GPE by cyclic voltammetry. The morphology and electrochemical properties of CoHCF/GPE were studied by scanning electron microscope (SEM), electrochemical impedance spectroscopy (EIS) and the electrochemical measurements. The CoHCF/GPE showed favorable sensing effect toward H 2 O 2 . A novel non-enzyme H 2 O 2 sensor was constructed. Under the optimal experimental conditions, the proposed sensor responded to the addition of H 2 O 2 very quickly (about 2 s) with a wide linear rang (0.005–1.2 mM) and a low detection limit (7.1 nM). This sensor was easy to be fabricated and showed excellent stability and anti-interference ability.
研究领域:
电化学
·
生物传感器
·
纳米材料
·
分子诊断
·
转化医学
·
即时检测
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2019
·Vol. 44
·期 31
·16348-16358
·
IF 4.084
Dandan Sun,Dechao Chi,Zekang Yang,Zipeng Xing,Junwei Yin,Zhenzi Li,Qi Zhu,Wei Zhou
Mesoporous g-C 3 N 4 /Zn–Ti layered double hydroxide (LDH)-laminated van der Waals heterojunction nanosheets were prepared by a facile one-step in situ hydrothermal method . Due to the strong electrostatic interactions between the positively charged Zn–Ti LDH and negatively charged g-C 3 N 4 nanocrystal , a laminated van der Waals heterostructure was successfully formed between Zn–Ti LDH and g-C 3 N 4 . The mesoporous g-C 3 N 4 /Zn–Ti LDH-laminated van der Waals heterojunction, which had a narrow bandgap of 2.41 eV extended the photoresponse to the visible light region. The obtained heterojunctions showed excellent visible-light-driven photocatalytic performance for the complete removal of ceftriaxone sodium (up to ∼97%) and a high hydrogen production rate (∼161.87 μmol h −1 g −1 ). This was mainly attributed to the formation of the laminated van der Waals heterojunctions, which favoured charge separation and the absorption of visible light, and the mesoporous structure, which provided more surface active sites. This facile strategy for preparing mesoporous g-C 3 N 4 /Zn–Ti LDH-laminated van der Waals heterojunctions offers new insights for the fabrication of high-performance van der Waals heterojunction photocatalytic materials.
研究领域:
材料科学
·
光催化
·
纳米材料
·
环境化学
·
能源化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）