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Abstract
Highlights
1. 采用TA-DH-COF内部多种活性中心(C=O、C=N和C=C)与石墨烯(GA)材料的复合设计,可显著提高储钠性能和电化学动力学。
2. TA-DH-COF/GA负极通过可逆的Na+配位机制存储能量,具有优异的电容性特征。
3. 当与活性炭(AC)正极组装成SIC装置时,可实现超高的能量密度(约56 Wh kg-1)和功率密度(约10,000 W kg-1),同时具备长循环稳定性(18,000次循环后保持88.8%容量)。
4. 该研究展示了COF基材料在SIC中应用的巨大潜力,可实现高能量密度和高功率密度的储能器件。
results
Fig.1 a) Hierarchical pore-structure of TA-DH-COF/GA models at different scales. b,d) SEM, c) TEM images of TA-DH-COF/GA. e) Vertical view of the deformation charge density images of TA-DH-COF/GA. f) The electrostatic potential map of TA-DH-COF.
Fig.2 a) Experimental, Pawley refined, and simulated PXRD patterns for TA-DH-COF b) N2 adsorption measurements at 77 K and c) pore size distribution of TA-DH-COF, TA-DH-COF/GA, and GA. d) FT-IR spectra of TAPT, DHTP, TA-DH-COF, and TA-DH-COF/GA. e) Solid-state 13C NMR spectra of TA-DH-COF and TA-DH-COF/GA. XPS spectra of f) C 1s and g) N 1s of TA-DH-COF, TA-DH-COF/GA, and GA.
Fig.3 a) CV curves of TA-DH-COF/GA at 0.2 mV s−1. b) Cycling performance of GA, TA-DH-COF, and TA-DH-COF/GA. c) The discharge and charge curves of TA-DH-COF/GA at 100 mA g−1 for the first three cycles and the 50th and 100th cycles d) Nyquist plots of TA-DH-COF and TA-DH-COF/GA. e) The relationships between Z′ and ω−1/2 from 0.1 to 0.01 Hz corresponding linear fitting curves of TA-DH-COF and TA-DH-COF/GA. f) Rate capability of GA, TA-DH-COF, and TA-DH-COF/GA. g) Long-term cycling stability of TA-DH-COF/GA at 10 A g−1. h) Comparison of the performance to other COF anodes in SIBs.
Fig.4 CV curves at different scanning rates, determination of b-values of cathodic and anodic current peaks, and contribution ratio of capacitance control: a–c) the as-prepared TA-DH-COF/GA, d–f) the TA-DH-COF/GA after 100 cycles. g) In situ Nyquist plots, c) preselected voltage, and d) corresponding Rs, Rct, and Zw at various voltages for TA-DH-COF/GA.
Fig.5 a) The discharge and charge curves of TA-DH-COF/GA at 0.1 A g−1. Ex situ b) FT-IR spectra, c) EPR spectra, d) C 1s XPS spectra, e) O 1s XPS spectra, and f) N 1s XPS spectra of TA-DH-COF/GA at different charge-discharge states. g) The simulated sodiation route for TA-DH-COF electrode. The left and right axes represent the redox potential versus Na/Na+ and the total energy for various Na+-intercalated structures, respectively. h) Structural evolution during the sodiation procedure.
Fig.6 a) Schematic diagram of the TA-DH-COF/GA||AC SIC device. b) CV curves of TA-DH-COF/GA and AC in Na half cells (top) and TA-DH-COF/GA||AC SIC device (bottom) at 2 mV s−1. c) CV curves, d) rate performance, e) charge-discharge plots of TA-DH-COF/GA||AC SIC device. f) Ragone plots of the optimal TA-DH-COF/GA||AC SIC device compared with previously reported SICs. g) Long-term cycling performance of TA-DH-COF/GA||AC at a high current density of 2 A g−1. h) Photograph of LED arrays and thermometer powered by the SIC device.
Details
A Novel Hierarchical Porous Covalent Organic Framework as Multi-Active-Center Anode for High-Performance Sodium Ion Capacitors
原文链接：
https://doi.org/10.1002/adfm.202415402
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