Synergy of Oxygen Plasma and Al2O3 Atomic Layer Deposition on Improved Electrochemical Stability of Activated Carbon-Based Supercapacitor

Fuming Zhang; Guanghui Song; Dayakar Gandla; Yair Ein-Eli; Daniel Q. Tan

doi:10.3389/fenrg.2021.653203

Synergy of Oxygen Plasma and Al₂O₃ Atomic Layer Deposition on Improved Electrochemical Stability of Activated Carbon-Based Supercapacitor

Fuming Zhang, Guanghui Song, Dayakar Gandla, Yair Ein-Eli^*, Daniel Q. Tan^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

As a conventional electrode material of electric double-layer capacitors (EDLC), activated carbon (AC) still faces challenges to exhibit high capacitance. To address this problem, herein, we introduce a combined method of oxygen plasma and Al₂O₃ tomic layer deposition (ALD) on AC electrodes to reduce the impedance and improve the cycle stability of EDLC. The defect structure can be precisely designed by simply tuning the oxygen-plasma treatment time, thereby affecting the microstructures of AC electrode. Such a tactic permits the first-operated AC electrode with more defects and the ALD passivation of AC resulting in an outstanding rate performance for the device (40.6 F g^–1 at 5 mA cm^–2, 20.1 Fg^–1 at 100 mA cm^–2) and cycling stability (∼90% retention after 5,000 cycles). This benefit from the synergistic effect of defects from doped oxygen and stable aluminum oxide layer on the electrode surface. This work delivers a feasible strategy to construct a stable AC material with superior cycling performance for supercapacitor.

Original language	English
Article number	653203
Journal	Frontiers in Energy Research
Volume	9
DOIs	https://doi.org/10.3389/fenrg.2021.653203
State	Published - 6 Apr 2021

Keywords

aluminum oxide
atomic layer deposition
high voltage
porous activated carbon
supercapacitors

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.3389/fenrg.2021.653203

Cite this

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title = "Synergy of Oxygen Plasma and Al2O3 Atomic Layer Deposition on Improved Electrochemical Stability of Activated Carbon-Based Supercapacitor",

abstract = "As a conventional electrode material of electric double-layer capacitors (EDLC), activated carbon (AC) still faces challenges to exhibit high capacitance. To address this problem, herein, we introduce a combined method of oxygen plasma and Al2O3 tomic layer deposition (ALD) on AC electrodes to reduce the impedance and improve the cycle stability of EDLC. The defect structure can be precisely designed by simply tuning the oxygen-plasma treatment time, thereby affecting the microstructures of AC electrode. Such a tactic permits the first-operated AC electrode with more defects and the ALD passivation of AC resulting in an outstanding rate performance for the device (40.6 F g–1 at 5 mA cm–2, 20.1 Fg–1 at 100 mA cm–2) and cycling stability (∼90% retention after 5,000 cycles). This benefit from the synergistic effect of defects from doped oxygen and stable aluminum oxide layer on the electrode surface. This work delivers a feasible strategy to construct a stable AC material with superior cycling performance for supercapacitor.",

keywords = "aluminum oxide, atomic layer deposition, high voltage, porous activated carbon, supercapacitors",

author = "Fuming Zhang and Guanghui Song and Dayakar Gandla and Yair Ein-Eli and Tan, {Daniel Q.}",

note = "Publisher Copyright: {\textcopyright} Copyright {\textcopyright} 2021 Zhang, Song, Gandla, Ein-Eli and Tan.",

year = "2021",

month = apr,

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doi = "10.3389/fenrg.2021.653203",

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T1 - Synergy of Oxygen Plasma and Al2O3 Atomic Layer Deposition on Improved Electrochemical Stability of Activated Carbon-Based Supercapacitor

AU - Zhang, Fuming

AU - Song, Guanghui

AU - Gandla, Dayakar

AU - Ein-Eli, Yair

AU - Tan, Daniel Q.

PY - 2021/4/6

Y1 - 2021/4/6

N2 - As a conventional electrode material of electric double-layer capacitors (EDLC), activated carbon (AC) still faces challenges to exhibit high capacitance. To address this problem, herein, we introduce a combined method of oxygen plasma and Al2O3 tomic layer deposition (ALD) on AC electrodes to reduce the impedance and improve the cycle stability of EDLC. The defect structure can be precisely designed by simply tuning the oxygen-plasma treatment time, thereby affecting the microstructures of AC electrode. Such a tactic permits the first-operated AC electrode with more defects and the ALD passivation of AC resulting in an outstanding rate performance for the device (40.6 F g–1 at 5 mA cm–2, 20.1 Fg–1 at 100 mA cm–2) and cycling stability (∼90% retention after 5,000 cycles). This benefit from the synergistic effect of defects from doped oxygen and stable aluminum oxide layer on the electrode surface. This work delivers a feasible strategy to construct a stable AC material with superior cycling performance for supercapacitor.

AB - As a conventional electrode material of electric double-layer capacitors (EDLC), activated carbon (AC) still faces challenges to exhibit high capacitance. To address this problem, herein, we introduce a combined method of oxygen plasma and Al2O3 tomic layer deposition (ALD) on AC electrodes to reduce the impedance and improve the cycle stability of EDLC. The defect structure can be precisely designed by simply tuning the oxygen-plasma treatment time, thereby affecting the microstructures of AC electrode. Such a tactic permits the first-operated AC electrode with more defects and the ALD passivation of AC resulting in an outstanding rate performance for the device (40.6 F g–1 at 5 mA cm–2, 20.1 Fg–1 at 100 mA cm–2) and cycling stability (∼90% retention after 5,000 cycles). This benefit from the synergistic effect of defects from doped oxygen and stable aluminum oxide layer on the electrode surface. This work delivers a feasible strategy to construct a stable AC material with superior cycling performance for supercapacitor.

KW - aluminum oxide

KW - atomic layer deposition

KW - high voltage

KW - porous activated carbon

KW - supercapacitors

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