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沉积在不锈钢集流体上的二氧化锰/石墨烯纳米壁电极的超级电容性能

Super-Capacitive Performance of Manganese Dioxide/Graphene Nano-Walls Electrodes Deposited on Stainless Steel Current Collectors.

作者信息

Amade Roger, Muyshegyan-Avetisyan Arevik, Martí González Joan, Martí Pino Angel X, György Eniko, Pascual Esther, Andújar José Luís, Serra Enric Bertran

机构信息

ENPHOCAMAT (FEMAN) Group, Department of Applied Physics, Universitat de Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain.

Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, E-08028 Barcelona, Spain.

出版信息

Materials (Basel). 2019 Feb 4;12(3):483. doi: 10.3390/ma12030483.

DOI:10.3390/ma12030483
PMID:30720766
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6390200/
Abstract

Graphene nano-walls (GNWs) are promising materials that can be used as an electrode in electrochemical devices. We have grown GNWs by inductively-coupled plasma-enhanced chemical vapor deposition on stainless steel (AISI304) substrate. In order to enhance the super-capacitive properties of the electrodes, we have deposited a thin layer of MnO₂ by electrodeposition method. We studied the effect of annealing temperature on the electrochemical properties of the samples between 70 °C and 600 °C. Best performance for supercapacitor applications was obtained after annealing at 70 °C with a specific capacitance of 104 F g at 150 mV s and a cycling stability of more than 14k cycles with excellent coulombic efficiency and 73% capacitance retention. Electrochemical impedance spectroscopy, cyclic voltammetry, and galvanostatic charge/discharge measurements reveal fast proton diffusion (1.3 × 10 cm²·s) and surface redox reaction after annealing at 70 °C.

摘要

石墨烯纳米壁（GNWs）是一种很有前景的材料，可用于电化学装置中的电极。我们通过感应耦合等离子体增强化学气相沉积法在不锈钢（AISI304）基底上生长了GNWs。为了提高电极的超级电容性能，我们采用电沉积法沉积了一层MnO₂薄膜。我们研究了70℃至600℃之间退火温度对样品电化学性能的影响。在70℃退火后，超级电容器应用获得了最佳性能，在150 mV s时比电容为104 F g，循环稳定性超过14000次循环，具有优异的库仑效率和73%的电容保持率。电化学阻抗谱、循环伏安法和恒电流充/放电测量表明，在70℃退火后质子扩散速度很快（1.3×10 cm²·s），且发生了表面氧化还原反应。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/1d00217f06bb/materials-12-00483-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/ee0da9e9da69/materials-12-00483-g001.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/bc5fac118549/materials-12-00483-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/b72bb3026bbc/materials-12-00483-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/17d026d61ece/materials-12-00483-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/bde379b40080/materials-12-00483-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/1d00217f06bb/materials-12-00483-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/ee0da9e9da69/materials-12-00483-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/287d4392b47a/materials-12-00483-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/708176b05268/materials-12-00483-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/5f5705e14a45/materials-12-00483-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/bc5fac118549/materials-12-00483-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/b72bb3026bbc/materials-12-00483-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/17d026d61ece/materials-12-00483-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/bde379b40080/materials-12-00483-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/f45d/6390200/1d00217f06bb/materials-12-00483-g009.jpg

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