POLYMER
·
2020
·
IF 4.231
Peng Liu,Qi Wang,Dongshan Wang,Xin Kang,Jingye Niu
The electrochemical capacitive property of the tetraaniline (TA) microcrystals was investigated for the first time in the present work. The TA microcrystals/reduced graphene oxide (TA/rGO) composite film was optimized by facile vacuum filtration, with thickness of 0.043 mm, electrical conductivity of 4.22 S/cm, and stable specific capacitance near 420 F/g at 100 mV/s for 9000 cycles as free-standing electrode. The superior electrochemical stability should be originated from the crystal structure of the TA flakes, which could efficiently prevent the volume change and hydrolytic degradation during the charging/recharging cycles. The TA/rGO based symmetrical solid-state supercapacitor possessed a high specific capacitance of 459.1 F/g at 1 A/g, an excellent cyclic stability with retention of 89.5% after 2000 cycles and an outstanding flexibility with retention of 77.9% after 100 cycles of 120°-bending.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2020
·
IF 6.215
Xiaobai Li,Leipeng Zhang,Gaoping Xu,Bo Wang,Shuang Yu,Zichen Ren,Feifei Ren,Shuliang Dou,Yao Li,Jiupeng Zhao
In this study, ionic liquids (ILs) are used instead of conventional volatile aqueous or organic electrolytes to fabricate durable polyaniline (PANI)-based infrared variable emittance devices (IR-VEDs). It is of significance to find that different IL electrolyte systems have a great effect on the electrochemical stability and IR tunability of the PANI films. The present PANI films exhibit much better electrochemical stability when cycling in ILs having tetrafluoroborate and bis(trifluoromethylsulfonyl)imide anions than cycling in ILs with dicyanamide and tricyanomethanide anions. Furthermore, compared with pure IL electrolytes, the addition of high-mobility cations (Li + ) into ILs can significantly enhance the IR tunability of PANI films. The IR-VED based on a preferable ionogel electrolyte membrane exhibits a high emittance variation (Δԑ) of 0.42 in 2.5–25 µm region, and fast switching times of 14.6 s/17.0 s. More importantly, the device still maintains a high Δԑ value of 0.35 after 500 electrochemical cycles, demonstrating promising applications in the dynamic IR regulation field.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Energy Materials
·
2025
·
IF 5.5
Zilong Su,Mengyuan Jin,Chunxi Hu,Ran Liu,Renbing Wu,Deliang Xu,Yanhui Guo
Developing practical solid electrolytes is a tough challenge and an urgent necessity for future cell applications. The Na2B12H12 solid electrolyte (SE) is considered as one of the most promising candidates due to its high stability, excellent alkali metal compatibility, low density, and safe properties. However, its inherent low ionic conductivity at room temperature and narrow electrochemical stability window (ESW) limit its development. Herein, a simple method of ball milling Na2B12H12 in an oxygen atmosphere has been developed, which can significantly increase the ionic conductivity by 3 orders of magnitude and broaden the ESW. Distinctively, high ionic conductivity (1.3 × 10–3 S cm–1), wide ESW (5.2 V), favorable thermal stability (>300 °C), and good electrode adaptability have been achieved by an oxidized Na2B12H12-20 wt % SiO2 composite. The Na3V2(PO4)3O2F/oxidized Na2B12H12-20 wt % SiO2/Na cell shows a specific capacity retention of 83.7% after 100 cycles at 0.1 C and a specific capacity of 49.1 mAh g–1 at 2 C. Hence, the oxidized Na2B12H12 SE proposed in this study has the potential to function as a practical material for all-solid-state batteries (ASSBs).
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2021
·Vol. 13
·期 1
·1-13
·
IF 16.419
Chen Keng,Wang Zeming,Wang Liang,Wu Xiuzhen,Hu Bingjie,Liu Zheng,Wu Minghong
High-efficiency electrochemical hydrogen evolution reaction (HER) offers a promising strategy to address energy and environmental crisis. Platinum is the most effective electrocatalyst for the HER. However, challenging scarcity, valuableness, and poor electrochemical stability still hinder its wide application. Here, we designed an outstanding HER electrocatalyst, highly dispersed rhodium (Rh) nanoparticles with an average diameter of only 3 nm supported on boron (B) nanosheets. The HER catalytic activity is even comparable to that of commercial platinum catalysts, with an overpotential of only 66 mV in 0.5 M H 2 SO 4 and 101 mV in 1 M KOH to reach the current density of 10 mA cm −2 . Meanwhile, the catalyst exhibited impressive electrochemical durability during long-term electrochemical processes in acidic and alkaline media, even the simulated seawater environment. Theoretical calculations unraveled that the structure–activity relationship between B(104) crystal plane and Rh(111) crystal plane is beneficial to the release of hydrogen, and surface O plays a vital role in the catalysis process. Our work may gain insights into the development of supported metal catalysts with robust catalytic performance through precise engineering of the strong metal-supported interaction effect.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2021
·
IF 4.089
Jianghe Liu,Zijian Ye,Xingcheng Hu,Sultan Ahmed,Shenhua Song
The scarcity of Li along with its uneven distribution in earth has become a great challenge in the field of electrochemical energy storage. Replacing Li with Na may address the above issues, as Na and Li are very similar in electrochemical characteristics, and Na is abundant in nature with low cost. Herein, the Na-ion conducting gel polymer membranes comprising a 2-HEC/EMITf/NaTf system are synthesized by employing the solution-casting method. The effects of NaTf salt and EMITf ionic liquid on the electrical and electrochemical properties of membranes are investigated. It is demonstrated that the salt is dissolved in the polymer matrix, thereby raising its ionic conductivity (IC), which is further raised by ionic liquid incorporation. The optimized membrane (2-HEC:EMITf:NaTf = 1:0.6:0.15 in mass, named as GPE/Na-3) exhibits a high room-temperature IC of 1.11× 10–3 S cm–1 along with a wide electrochemical stability window of 4.8 V. The membrane also displays sound tensile strength and breaking strain (4.5 MPa and 94.4%, respectively). As the electrolyte, the optimized membrane is combined with graphene electrodes to fabricate a supercapacitor. The supercapacitor presents a high capacitive behavior with an appealing cyclic stability. As evident from the above performance, it is believed that the Na-ion conducting gel polymer membrane possesses potential applications in future Na-ion energy storage devices.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Liya Chen,Jifang Fu,Qi Lu,Liyi Shi,Mengmeng Li,Linna Dong,Yufeng Xu,Rongrong Jia
In this work, the free-standing ion gel polymer electrolytes (IGPEs) membranes have been successfully prepared by in situ polymerization of N-Vinyl-3-butyl imidazole bis(trifluoromethylsulfonyl)imide (VBImTFSI) and poly(ethylene glycol) methacrylate (PEGMA) in the presence of 1-butyl-3-methylimidazolium bis-(trifluoromethylsulfonyl)imide ([BMIM]TFSI) and a small amount of a cross-linker, with/without lithium salt. The obtained semitransparent and flexible IGPEs membranes exhibit good thermal stability and mechanical strength. The ionic conductivity is improved with increasing ionic liquid content and with the addition of lithium salt and the ionic conductivity is up to 2.11 × 10 −4 S cm −1 at room temperature. The IGPEs containing LiTFSI exhibit wide electrochemical stability up to 4.9 V versus Li + /Li, and a superior lithium-ion transference number ( t Li+ ) of 0.83. In addition, Li/LiFePO 4 half cells assembled with the optimized IGPEs exhibit high charge/discharge efficiency and stable cycle performance at C/10 rate, delivering a discharge capacity of 142.2 mA h g −1 with stable coulombic efficiency (100%) after 100 cycles.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHIMICA ACTA
·
2018
·
IF 5.116
Liang Wang,Chengxin Wang,Haifei Wang,Xinyan Jiao,Yu Ouyang,Xifeng Xia,Wu Lei,Qingli Hao
Sandwich-like ZIF-8 nanocrystal derived N-doped carbon decorated graphene sheets are developed through in-situ growth and followed by a thermal annealing treatment. The sandwich-like N-doped carbon decorated graphene sheets (NCGs) contain graphene substrate and the carbon nanoparticles with 30–50 nm in size. The sandwich-like NCGs generate a large specific surface area of 816.4 m 2 g −1 . With the high surface area and nitrogen doping, the as-fabricated NCGs as electrode materials for supercapacitor exhibit high specific capacitance of 225.0 F g −1 at 0.5 A g −1 , an enhanced rate capability and excellent electrochemical stability with 96.8% retention after 10000 cycles even at 10 A g −1 . The symmetry supercapacitor based on NCGs delivers an energy density of 12.7 Wh kg −1 at a specific power of 447 W kg −1 . When the power density increases to 15126 W kg −1 , the energy density can still keep 6.5 W h kg −1 . Furthermore, the symmetry supercapacitor shows an excellent cycle stability with 96.6% capacitance retention at 2 A g −1 after 10000 cycles.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2021
·Vol. 17
·期 37
·2101326
·
IF 13.281
Chao Zheng,Jun Zhang,Yang Xia,Hui Huang,Yongping Gan,Chu Liang,Xinping He,Xinyong Tao,Wenkui Zhang
Argyrodite Li 6 PS 5 Cl with high Li + conductivity is a promising material for solid-state electrolytes (SSEs) in all-solid-state lithium batteries (ASSLBs). However, the narrow electrochemical window of Li 6 PS 5 Cl limits its applications in ASSLBs with high energy densities, and those that consist of high-voltage cathode materials and metallic lithium anodes. Unstable lithium deposition and stripping at interfaces is also a factor that restricts its industrialization. Herein, the authors investigated the electrochemical stability of Li 6 PS 5 Cl using it as both the cathode and electrolyte. The Li 6 PS 5 Cl-C/Li 6 PS 5 Cl/Li cell and symmetric Li/Li 6 PS 5 Cl/Li cells failed after a certain number of cycles, and subsequently healed electrochemically. This failure/healing phenomenon recurred during the cycling process. The self-healing behavior is closely related to the electrochemical window, which suggests that it can be controlled by the charge–discharge voltage range. In-depth X-ray photoelectron spectroscopy, in situ Raman spectroscopy, and in situ electrochemical impedance spectroscopy revealed the reversible Li 6 PS 5 Cl decomposition and metallic lithium growth inside the electrolyte during the cycling process. This self-healing behavior is mainly attributed to the reciprocating lithium growth and reversible redox reaction of the Li 6 PS 5 Cl decomposition. The proposed self-healing mechanism is a key aspect for sulfide-based SSEs, guiding the interface modification, and material design of ASSLBs.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Huabin Guo,Shengwen Zhong,Liping Chen,Guanghuai Peng,Fang Fang Wang,TingTing Yan,Jingwei Hu
The PVDF-HFP/PMMA/CMC blended solid polymer prepared by solvent volatilization method with PVDF-HFP as host polymer matrix and PVDF-HFP/PMMA as blended membrane and then PVDF-HFP/PMMA modified by coating carboxymethyl cellulose (CMC) was introduced in this study to overcome the shortcomings of organic solvent - based liquid electrolyte in lithium-ion batteries. The synthesized copolymers were characterized by FTIR, TGA, XRD, and the results show that PMMA can be well dispersed in PVDF-HFP solution and the addition of CMC can reduce the crystallinity of the polymer membrane, which accelerates the movement of the polymer chain segments and improves the migration rate of lithium-ions. The electrical conductivity of the gel polymer was investigated by AC impedance, and the room temperature ionic conductivity of the gel polymer was up to the order of 10 -3 S·cm -1 , and the electrochemical stability window was 4.8 V. The polymer lithium-ion battery assembled with LiCoO 2 as cathode and lithium sheet as anode has good cycle stability. The lithium metal polymer cell delivered discharge specific capacity with 162.52 mAh.g -1 at the first cycle, and these properties indicate that the modified gel polymer has applicative prospect in polymer lithium-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Haoan Que,Chengshuai Chang,Xuena Yang,Feng Jiang,Mei Li
Hierarchical porous carbon materials (HPC) based on sulfur-urea-formaldehyde resins have been prepared with different size of silicas as templates, following by carbonization and alkaline etching. When tested in 6 M KOH, the storage capacitance of HPC is as high as 625 F g -1 at 1.0 A g -1 , showing excellent rate capability (288 F g -1 at 10 A g -1 ). Furthermore, HPC possess remarkable electrochemical cycling stability (less than 4.0% loss after 5000 cycles) when tested at 10 A g -1 . At the same time, the energy density ( E ) of HPC was 12.5 and 44.6 Wh kg -1 at the power density ( P ) of 288 and 300 W kg -1 with the electrolytes of 6 M KOH and 1 M LiPF6 in EC/DEC at the corresponding test systems illustrating this materials has potential practical application potential. The superior capacitive performances resulted from its high surface area, hierarchical micro/meso/macroporous structures and heteroatoms doping of the HPC, which providing the ideal storage capacity, fast transport speed of electrolyte ions, and outstanding synergistic effect of doped heteroatoms. These results demonstrate that the HPC electrode materials with unique pore structure and chemical composition hold particularly promising prospect as supercapacitors.
研究领域:
材料科学
·
能源存储与转换
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Chao Li,Ying Huang,Xuansheng Feng,Zheng Zhang,Heng Gao,Jiaxin Huang
This study aims to prepare an organic-inorganic reticular polymer electrolyte . Isocyanate acts as a bridge that connects fumed silica and PEO molecular chains . The PEO-TDI-SiO 2 solid polymer electrolytes developed can significantly have improved ionic conductivity of 0.12 mS cm −1 at ambient temperature. This is because the TDI-SiO 2 nanoparticles inhibits polymer crystallization which provides more continuous Li-ion transport pathways. Tests at 60 °C indicate that the cross-linked structure of covalent TSI bonded to PEO effectively enlarges the electrochemical window of the polymer electrolyte to 5.6 V. Also, the PTSI electrolyte membrane has a higher Li + transference number of 0.33 compared to the PEO-LiTFSI electrolytes. It is worth noting that the assembled LiFePO 4 |PTSI8%|Li cells deliver outstanding rate performance and stable cycling performance. All these considerable merits of PTSI membrane demonstrate that PTSI is a promising candidate that can be used as solid polymer electrolytes for the next-generation Li-ion batteries.
研究领域:
材料科学
·
能源存储
✓ 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
危险品化学品经营许可证（带存储）