Polymers
·
2025
·Vol. 17
·期 9
·1198
·
IF 4.9
Baoning Zhu,Jinghua Liu,Qijun Zhong,Yaru Wen,Qianqian Dong,Yuhao Li,Qianqian Jin,Yao Lu
Heteroatom-doped biomass-derived porous carbon materials show promising applications as electrode components in energy storage technologies. In this investigation, we present a template-assisted pyrolysis procedure to fabricate nitrogen–oxygen dual-doped carbon materials. Firstly, the precursor and template initially polymerized to form a white jelly-like gel, which was freeze-dried to create a nanosheet-assembled structure. Subsequent high-temperature pyrolysis induced the formation of a porous structure with nanosheet morphology. The CMC-ZnK sample derived from the dual template of potassium citrate and zinc acetate pyrolyzed at 800 °C exhibits optimal electrochemical performance, delivering a specific capacitance of 271.4 F g−1at 1 A g−1in a three-electrode configuration, along with outstanding rate capability (90% retention, 244 F g−1at 10 A g−1). The constructed supercapacitor demonstrated an energy density of 6.5 Wh kg−1under a power density of 500 W kg−1. Furthermore, this study systematically investigated the performance variation mechanisms at different temperatures, revealing the relationship between structural composition and temperature in biomass materials.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Chemistry
·
2020
·
IF 7.216
Fangyuan Hu,Hao Peng,Tianpeng Zhang,Wenlong Shao,Siyang Liu,Jinyan Wang,Chenghao Wang,Xigao Jian
Lithium–sulfur (Li–S) batteries are promising energy‐storage devices for future generations of portable electronics and electric vehicles because of the outstanding energy density, low cost, and nontoxic nature of S. In the past decades, various novel electrodes and electrolytes have been studied to improve the performance of Li–S batteries. However, the very limited lifespan and rate performance of Li–S batteries originating from the dissolution and diffusion of long‐chain polysulfides in liquid electrolytes, and the intrinsic poor conductivity of S severely hinder their practical application. Herein, an electrospinning method was developed to fabricate a thin conductive interlayer consisting of meso-/microporous N/O dual-doping carbon nanofiber (CNF). The freestanding 3D interwoven structure with conductive pathways for electrons and ions can enhance the contact between polysulfides and N/O atoms to realize the highly robust trapping of polysulfides via the extremely polar interaction. Consequently, combining the meso-microporous N/O dual-doping CNF interlayer with a monodispersed S nanoparticle cathode results in a superior electrochemical performance of 862.5 mAh/g after 200 cycles at 0.2 C and a cycle decay as low as 0.08% per cycle. An area specific capacity of 5.22 mAh/cm 2 can be obtained after 100 cycles at 0.1 C with a high S loading of 7.5 mg/cm 2 .
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
ADVANCED FUNCTIONAL MATERIALS
·
2021
·Vol. 31
·期 51
·2107246
·
IF 18.808
Hongli Deng,Lei Wang,Shengyang Li,Meng Zhang,Tao Wang,Jian Zhou,Maoxin Chen,Song Chen,Jinhui Cao,Qiusheng Zhang,Jian Zhu,Bingan Lu
Constructing electrode materials with fast ions and electrons transport channels is an effective solution to achieve high-power-density and long-cycle potassium-ion batteries (PIBs). Herein, completely opening radial pores in N/O dual-doped carbon nanospheres (RPCNSs) are constructed as anode for high-power PIBs. The RPCNS with hierarchical structure (micro/meso/macropores and radial channels) and N/O dual-doping permits speedy ions and electrons transportation within the carbon nanospheres anode, achieving a reversible capacity of 346 mAh g −1 at 50 mA g −1 after 360 cycles and long-term cycling life over 2000 cycles without obvious capacity attenuation. The in situ Raman and kinetic analysis (in situ electrochemical impedance spectroscopy and galvanostatic intermittent titration) suggest that the exquisitely designed pore structure and heterodoping enable highly reversible electrochemical reaction and fast de/intercalation kinetics. Moreover, the full cells packaged with RPCNS anode can be fully charged in 10 s and exhibit the highest charge power density of 24 866 W kg −1 and longest cycling endurance of 5000 cycles in reported PIBs. The unique structural engineering provides a new way for high-power density potassium-ion 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
ENERGY
·
2023
·
IF 9
Yunchao Li,Yangkai Sun,Hanming Li,Mengwei Sun,Jie Shen,Shurong Wang
In this study, we report a unique, facile process for the preparation of a high-nitrogen-oxygen dual-doped three-dimensional (3D) hierarchical porous carbon network by one-step pyrolysis and in situ activation under a CO 2 atmosphere combined with acid treatment using Eriocheir sinensis as the precursor. The evolution of the physicochemical structure of carbon at different pyrolysis temperatures was investigated. Removing inorganics from the shell carbon of Eriocheir sinensis enabled the formation of a unique 3D network structure. In addition, a high doping concentration of nitrogen and oxygen can be formed in the porous carbon skeleton. The increase in the pyrolysis temperature was beneficial to the pore development and graphitisation of carbon. Because of the interconnected 3D hierarchical porous structure and high heteroatom doping content, which provides fast channels for electron and ion transport, the obtained carbon materials exhibit excellent capacitive performance as supercapacitor electrodes. Quantum chemical calculations further confirmed that the heteroatom-doped carbon plane has a larger negative charge and stronger interaction with K + than that of the pure carbon surface. This inexpensive green carbon material based on food waste is expected to be a candidate material for high-performance electrode precursors.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
C-Journal of Carbon Research
·
2024
·Vol. 10
·期 3
·67
·
IF 3.9
Xiaoyan Shu,Yuanjiang Yang,Zhongtang Yang,Honghui Wang,Nengfei Yu
Lithium–sulfur batteries (LSBs) have attracted widespread attention due to their high theoretical energy density and low cost. However, their development has been constrained by the shuttle effect of lithium polysulfides and their slow reaction kinetics. In this work, a nitrogen/oxygen dual-doped porous carbon (N/O-PC) was synthesized by annealing the precursor of zeolitic imidazolate framework-8 grown in situ on MWCNTs (ZIF-8/MWCNTs). Then, the N/O-PC composite served as an efficient host for LSBs through chemical adsorption and providing catalytic conversion sites of polysulfides. Moreover, the interconnected porous carbon-based structure facilitates electron and ion transfer. Thus, the S/N/O-PC cathode exhibits high cycling stability (a stable capacity of 685.9 mA h g−1at 0.2 C after 100 cycles). It also demonstrates excellent rate performance with discharge capacities of 1018.2, 890.2, 775.1, 722.7, 640.4, and 579.6 mAh g−1at 0.2, 0.5, 1.0, 2.0, 3.0, and 5.0 C, respectively. This work provides an effective strategy for designing and developing high energy density, long cycle life LSBs.
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
危险品化学品经营许可证（带存储）