ACS Applied Energy Materials
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2025
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IF 5.5
Yuzhu Shi,Juanqin Xue,Yongqi Yu,Guangdong Wu,Changbin Tang
For the purpose of making high-value use of Chinese medicine waste, the preparation of derived biochar was studied and used as an electrode for supercapacitors (SCs). High-temperature KOH activation was used to convert the seed shells of discarded traditional Chinese medicine (Mubiezi) into graded porous carbon electrode materials, and the optimal electrode (MCSSAC-3) was obtained by optimizing the KOH addition ratio in this work. The MCSSAC-3 electrode obtained has a high specific surface area (1288.55 m2 g–1) and significantly higher specific capacitance of 302.29 F g–1 at 0.5 A g–1. The MCSSAC-3//MCSSAC-3 symmetric device has a high energy density of 11.13 Wh kg–1 at a power density of 350 W kg–1. In addition, even after 10,000 consecutive cycles, the MCSSAC-3//MCSSAC-3 symmetric device exhibits ideal capacitance retention of 87.16% at 10 A g–1. This work offers an approach for the preparation of low-cost and high-performance SCs carbon-based electrodes from discarded traditional Chinese medicine.
研究领域:
材料科学
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环境科学
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中医药学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Antai Zhu,Jun Huang,Haibo Xie,Wang Yue,Shangdong Qin,Fazhi Zhang,Qinqin Xu
The facile preparation of sustainable polymer gel electrolyte by using renewable natural polymers has attracted much attention, and the development of new polymer gel electrolyte materials largely depends on the facile design and preparation of a polymer network capable of effectively loading external high-performance electrolyte. In this study, taking the advantages of a newly developed solvent system superbase/DMSO/CO 2 for cellulose, a new and facile “all-in-one” strategy to engineer cellulose into flexible cellulosic poly (protic ionic liquids)/PVA-based composite organic ionogel electrolyte (CPOIE) has been developed through in situ derivatization, chemical cross-linking and compositing strategy using succinic anhydrides, epichlorohydrin, and polyvinyl alcohol, respectively. The findings show that CPOIEs exhibit both excellent mechanical properties and superior electrochemical properties (high ionic conductivity up to 4.2 mS/cm at room temperature with a wide electrochemical window of 2.0 V for C 1 P 1 OIE sample). A supercapacitor assembled by using the as-prepared C 1 P 1 OIE sample delivers a good specific capacitance of 122 F/g at 0.5 A/g, a high energy density up to 17.38 Wh/Kg at room temperature and an excellent cyclic stability up to 8000 cycles.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
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
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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
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产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2019
·Vol. 73
·期 10
·2583-2589
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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
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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
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纳米技术
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能源存储
·
柔性电子
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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）