JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Xuanxuan Han,Tao Jiang,Xing Chen,Demin Jiang,Kun Xie,Yinhua Jiang,Yuqiao Wang
The electrolyte additives of potassium ferricyanide and potassium persulfate can ensure that CoO-supercapacitors achieve a fast charge/slow discharge and long cycling stability. The redox couple of Fe(CN) 6 3− /Fe(CN) 6 4− can induce S 2 O 8 2− to produce the sulfate radical ( S O 4 · - ). Strong oxidizing species, including S 2 O 8 2− , Fe(CN) 6 3− and S O 4 · - , can accelerate oxidation of the CoO electrode surface from Co 2+ to Co 3+ in the charge process. The additives can achieve a good synergistic effect on accelerating CoO oxidation during the charge process. In a three-electrode cell, a CoO electrode with electrolyte additives achieves a fast-charge and slow-discharge time of 939 s and 1699 s at a current density of 1 A g −1 , respectively. The capacitance retention can be maintained at 84.5% after 10,000 cycles at a current density of 5 A g −1 . As a supercapacitor, the device can achieve a fast-charge and slow-discharge time of 156 s and 191 s at a current density of 1 A g −1 , respectively. The capacitance retention can be maintained at 85.5% after 10,000 cycles at a current density of 5 A g −1 .
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 Minerals Metallurgy and Materials
·
2020
·Vol. 27
·期 2
·220-231
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IF 1.713
Yang Tao,Liu Hui-juan,Bai Fan,Wang En-hui,Chen Jun-hong,Chou Kuo-Chih,Hou Xin-mei
Currently, developing supercapacitors with robust cycle stability and suitability for wide-temperature-range operations is still a huge challenge. In the present work, few-layer hexagonal boron nitride nanosheets (h-BNNSs) with a thickness of 2–4 atomic layers were fabricated via vacuum freeze-drying and nitridation. Then, the h-BNNSs/reduced graphene oxide (rGO) composite were further prepared using a hydrothermal method. Due to the combination of two two-dimensional (2D) van der Waals-bonded materials, the as-prepared h-BNNSs/rGO electrode exhibited robustness to wide-temperature-range operations from −10 to 50°C. When the electrodes worked in a neutral aqueous electrolyte (1 M Na 2 SO 4 ), they showed a great stable cycling performance with almost 107% reservation of the initial capacitance at 0°C and 111% at 50°C for 5000 charge—discharge 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
Nano Energy
·
2024
·
IF 16.8
Yong Ma,Qing Yang,Siling Liu,Shilin Lei,Shuai Tan,Caihong Wang,Yong Wu
An isotropic gel piezo-electrolyte generates piezoelectric potential when subjected to a compressive force but exhibits a relatively constant ionic conductivity under different pressures. Here, we present a pressure-alignable liquid crystalline gel (LCG) piezo-electrolyte to simultaneously enhance ionic conductivity along with piezoelectric generation for an efficient piezo-supercapacitor. The LCG piezo-electrolyte is obtained via converting 4-(1-ethyldecyl) benzenesulfonic acid (EDBSA) lyotropic liquid crystal filled with piezoelectric barium titanate particles into polyacrylamide hydrogel. An external pressure induces macroscopic alignment of lamellar EDBSA self-assembly and results in an increase in the ionic conductivity, from 48.5 mS cm −1 to 58.5 mS cm −1 . By virtue of the simultaneous conductivity promotion and piezoelectric generation, the piezo-supercapacitor constructed from the LCG piezo-electrolyte and carbon cloth-based polyaniline electrodes can be rapidly self-charged to 1220 mV by a compressive force of 20 N. Meanwhile, the piezo-supercapacitor delivers a specific capacitance of 2407 mF cm −2 with a 101.2 % retention after 10,000 charge-discharge cycles. The piezo-supercapacitor harvests mechanical energy and outputs electrical energy with a total energy conversion efficiency of 44.72 %. The work provides an effective strategy to construct synchronously external field-responsive films with multifunctionalities for enhanced energy conversion in integrated power cells.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Kun Zhang,Congwei Wang,Tao Feng,Xinglin Luo,Yuede Pan,Gang Li,Kaiying Wang
At extremely low temperatures, the incorporation of zwitterionic polymers in constructing high-speed ion channels hold immense potential to exponentially enhance ionic conductivity, which is lethally compromised by solidification and increased viscosity of electrolytes. However, the network structure formed by zwitterionic groups is susceptible to disruption caused by cations and anions in the electrolyte, thereby affecting its structural stability and mechanical properties. In this study, high-concentration divalent cations were successfully employed as both antifreeze agents and cross-linkers to fabricate stretchable and low temperature resistant hydrogel electrolytes. This dual-role mechanism of different high-concentration divalent cations (M 2+ ) in zwitterionic hydrogels was explicitly elucidated at the molecular level through the utilization of ex-situ Raman spectroscopy. This analysis has emphasized their crucial involvement in the formation of [-SO 3 − -M 2+ -SO 3 − -] coordination bonds with negatively charged groups (−SO 3 − ), thereby providing additional cross-linking points, as well as their hydration interactions with free water molecules, which contribute to its exceptional low temperature resistance. With the ion channels constructed from zwitterionic polymers and the low-temperature resistance given by the high salt concentration, the hydrogel electrolyte containing Ca 2+ achieved an impressive low-temperature ionic conductivity of 5.9 mS cm −1 , even at −50 ℃. The assembled supercapacitors (SCs) demonstrated a remarkable areal specific capacitance of 100.8 mF cm −2 at −40 °C, with a capacitance retention rate of 108.8 % after 10,000 cycles. This performance surpassed most reported antifreeze hydrogel electrolytes, offering valuable insights for designing flexible electrolytes with enhanced stability and high performance in low temperature environments.
研究领域:
材料科学
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能源存储
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物理化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yan Wang,Kaiyuan Xue,Xingyun Zhang,Xu Zhang,Bingjun Yang,Shusheng Xu,Junwei Lang
A fundamental understanding of the charge storage mechanism of electrochemical double-layer capacitors (EDLCs) requires an in-depth storage behavior investigation of independent ions (individual cations or anions) on the electrode surface. The direct in-situ observation for energy storage behavior of individual ions under realistic conditions remains challenge. Herein, in-situ monitoring the energy storage behavior of independent ions is realized with assistance of polymeric ionic liquids skillfully. Triangle cyclic voltammogram (CV) curves indicate that polymeric imidazole cations PVBIm + with huge size cannot enter the active carbon pores upon charging, whereas only free anions can. The CV and electrochemical quartz crystal microbalance (EQCM) simultaneously detect ion adsorption/desorption during charging. It’s proposed that ion adsorption/desorption is governed by electrostatic attraction and repulsion of charged particles. PVBIm + are adsorbed on the electrode surface due to ion adsorption mechanism during the negative polarization and have a small capacity contribution. Free anions contribute capacitance, their number entering the pore is determined by the interaction between polycaions and anions. Moreover, PVBIm(0.1) + with higher polymerization degree may promote desorption of polycations and prevent further adsorption of anions at higher potential in positive polarization. This work not only observes the charging behavior of independent ions, but also reveals the relevant charging mechanism through EQCM, paving the way for panorama of EDLC.
研究领域:
材料科学
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电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jiahui Fan,Kefa Wu,Aiying Chen,Mitang Wang,Xiaofeng Xie,Jitang Fan
Supercapacitance electrode materials with rapid charging/discharging performance are considerably useful in practical applications for time saving. However, the supercapacitance performance of the electrode materials is sharply degraded with the increase in current density. To achieve fast energy storage for portable devices, bimetallic nickel cobalt phosphides (NiCoPs), composed of special fingerprint-like nanosheets (NSs), are developed as electrode materials, which exhibit a high specific supercapacitance under large charging/discharging current density. The NiCoP NSs are assembled using entangled nanowires with a wide pore size distribution through hydrothermal and phosphorization reactions. The influence of phosphorization temperature on the morphologies, chemical compositions, and supercapacitance performance of NiCoP compounds is investigated. Electrochemical tests show that the fingerprint-like NiCoP NSs deliver a high specific capacitance of 2360, 1900, and 900 F g −1 at 1, 20, and 50 A g −1 , respectively, indicating outstanding capacity retentions of 81% (1–20 A g −1 ) and 38% (1–50 A g −1 ) at large charging/discharging current density. The assembled asymmetric supercapacitor of NiCoP//activate carbon presents an energy density of 156 Wh kg −1 at 1331 W kg −1 and maintains 67.5 Wh kg −1 at 27000 W kg −1 in aqueous KOH electrolyte. The bimetallic NiCoPs with a tunable fingerprint-like structure can enhance conductivity, provide nanoporous channels, and facilitate fast electrochemical reactions , which are remarkably beneficial for rapid energy storage and conversion applications.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMISTRY-A EUROPEAN JOURNAL
·
2021
·Vol. 27
·期 58
·14478-14488
·
IF 5.236
Fan Yang,Hao Guo,Yuan Chen,Mengni Xu,Wenhu Yang,Mingyue Wang,Meng Yang,Junye Zhang,Lei Sun,Tingting Zhang,Wu Yang
Graphical Nanoflower structural MnCo 2 O 4 /Ni-MOF composite prepared by in situ growth of Ni-MOF on the surface of MnCo 2 O 4 nanorods derived from Co/Mn-MOF at 600 °C has a high cycling stability and outstanding rate performance as supercapacitor electrode material. MnCo 2 O 4 is derived from a Co/Mn bimetallic metal-organic framework (MOF). Then Ni-MOF is directly grown on the surface of the obtained MnCo 2 O 4 to form a nano-flower structure with small balls. A large surface area, abundant active sites of MnCo 2 O 4 and porosity of Ni-MOF allow the prepared MnCo 2 O 4 /Ni-MOF composite material to deliver an excellent electrochemical performance. At the same time, an appropriate thermal treatment temperature of the MnCo 2 O 4 precursor is also very important for controlling the morphology of the obtained MnCo 2 O 4 and electrochemical performances of the resulted composite material including electric conductivity, specific capacitance and rate performance. The prepared MnCo 2 O 4 -600/Ni-MOF shows an ultrahigh rate performance (when the current density increases from 1 to 10 A g −1 , the capacitance retention rate is as high as 93.41 %) and good cycle stability (the assembled asymmetric supercapacitor advice delivers a capacitance retention rate of 94.74 % after 20 000 charge and discharge cycles) as well as a relatively high specific capacitance. These excellent electrochemical properties indicate that MnCo 2 O 4 /Ni-MOF has a good application prospect in the market.
研究领域:
材料科学
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电化学
·
储能技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Muhammad Saqib,Ali Asghar,Zhangwei Chen,Amal A. Abdel Hafez,Majed Y.A. Almashnowi,Qumail Arshad,Majed Yousef Awaji,Yasir Javad,Mohammed Kuku,Muhammad Shahid Rashid
Transition metal phosphates are gaining attention as an environmentally sustainable and high-theoretical capacity material for electrochemical energy storage devices. This study investigates the impact of adding functionalized graphene Oxide (GO) on the electrochemical sites of cobalt-phosphate (Co 3 (PO 4 ) 2 /GO composite) because of its high surface area and electrical conductivity to open up new possibilities for enhancing the performance of energy storage devices. Herein, nanoflakes like cobalt phosphate and composites with graphene oxide were synthesized using a hydrothermal approach. The crystallinity, morphological effect, and chemical compositional analysis were analyzed via XRD, SEM, and EDS. Then, the electrochemical performance is measured in two different setups, i.e., 2-electrode and 3-electrode cell assembly. In the 3-electrodes setup, the cobalt phosphate/GO composite revealed a high specific capacity of 660 C/g, corresponding to 5 mV/s compared to the individual. In the device performance, cobalt phosphate/GO is utilized as +ev electrode, whereas -ev electrode consists of activated carbon in supercapattery. In their results, the assembled devices produced a specific capacity of 458 C/g with remarkable energy and power density of 82.69 Wh/kg and 433.33 W/kg corresponding to a current density of 0.7 A/g, respectively, with good capacitive retention of 94.77 % after 6 K cycles. Moreover, the theoretical calculation measure from Dunn's model reveals a capacitive contribution increased from 35.51 % to 71.12 % with an increase in scan rates. The study offers a new avenue for advanced energy storage applications.
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 PAPERS
·
2019
·Vol. 73
·期 10
·2583-2589
·
IF 1.246
Zhao Li-Ping,Liu Gang,Zhang Peng,Sun Li-Qun,Cong Li-Na,Lu Wei,Sun Qi-Qi,Xie Hai-Ming,Wang Hong-Yu
Titanium disulfide (TiS 2 ) was adopted as a negative electrode material for the asymmetric sodium-ion supercapattery of TiS 2 /activated carbon using Na + -based organic electrolytes. This type of supercapattery possesses a working voltage as high as 3 V. The physical properties of the negative electrode were characterized by X-ray diffraction, scanning electron microscopy and X-ray photoelectron spectroscopy. The electrochemical performance tests revealed that the supercapattery had a relatively high rate performance and good cycle stability, displaying 77% capacity retention after 1000 cycles at a current density of 0.2 A g −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2021
·
IF 9.127
Shigen Bai,Yong Tang,Gong Chen,Yaopeng Wu,Yifu Liang,Shu Yang,Huilong Liu,Yingxi Xie
Supercapacitors (SCs) have garnered increasing attention as an alternative energy storage device but the relatively low potential window and energy density impede their application prospect. Herein, we propose a novel three-dimensional (3D) packaging method for the first time, utilizing high flexible phosphor-copper sheets (PCSs) sprayed with polytetrafluoroethylene (PTFE) and covered with polyimide (PI) films on their both sides as the serial medium followed by CO 2 laser irradiation to fabricate all-solid-state flexible high voltage supercapacitors (HVSCs). This method achieves double voltage output in the limited PI membrane compared with common 2D encapsulation. As a result, as-obtained HVSCs deliver not only an enhanced mechanical tensile strength up to 18.23 MPa but also the outstanding electrochemical performances, including ultrahigh working voltage window (10 V), high energy density (37.68 μWh/cm 2 ) and power density (3.38 mW/cm 2 ). Owing to the excellent flexibility, the HVSCs can be arbitrarily bent or twisted without obvious attenuation on capacitive property. After 10000 cycles, the capacitance retention of HVSCs still maintains to be 90.2%. This novel 3D packaging strategy may pave the way for developing high-performing SCs with wide operating voltage and high energy density for flexible displays, wearable equipment and integrated electrical devices.
研究领域:
材料科学
·
纳米技术
·
能源存储
·
柔性电子
·
电化学
·
高分子材料
·
先进制造
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）