Supercapacitor Materials and Fabrication
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Abstract
Abstract
Asymmetric supercapacitors (ASC) achieve an excellent balance of high energy density, high power density, and long cycle life by coupling battery-type and capacitive-type electrodes. Herein, we propose an in-situ oxidation method to grow Cu(OH)₂ nanowires on copper foam (CF) as a conductive backbone, followed by a secondary hydrothermal process to coat Co-LDH nanosheets, constructing a Co-LDH@Cu(OH)₂/CF self-standing electrode with a nano-tree-like structure. The optimized Co₃-LDH@Cu(OH)₂/CF electrode delivers a high specific capacitance of 1200 mF cm-2 at 1 mA cm-2 with excellent rate performance. An ACS assembled with Co₃-LDH@Cu(OH)₂/CF as the positive electrode and activated carbon as the negative electrode operates stably within 0~1.6 V, achieving an areal capacitance of 325.6 mF cm-2 at 5 mA cm-2, a high energy density of 115.8 mWh cm-2, and outstanding cycling durability. In-situ Raman spectroscopy reflects the charge storage state and confirms the good reversible electrochemical response in alkaline electrolyte. And in-situ scanning electrochemical microscopy (SECM) reveals the distribution of active sites and provides kinetic coefficients via approach curves.
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@article{Yuan2026Situ,
title = {In Situ Growth of Co-LDH/Cu(OH)<sub>2</sub> Nanotree Self-Standing Electrodes for Augmenting Asymmetric Supercapacitor Performance},
author = {Guojun Yuan and Hongfang Li and Lei Cheng and Hailin Liu and Haolu Sun},
journal = {Preprints.org},
year = {2026},
doi = {10.20944/preprints202608.1007.v1},
url = {https://doi.org/10.20944/preprints202608.1007.v1}
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