Shape-Tailorable Graphene-Based Ultra-High-Rate Supercapacitor for Wearable Electronics.
With the bloom of wearable electronics, it is becoming necessary to develop energy storage units, e.g., supercapacitors that can be arbitrarily tailored at the device level. Although gel electrolytes have been applied in supercapacitors for decades, no report has studied the shape-tailorable capability of a supercapacitor, for instance, where the device still works after being cut. Here we report a tailorable gel-based supercapacitor with symmetric electrodes prepared by combining electrochemically reduced graphene oxide deposited on a nickel nanocone array current collector with a unique packaging method. This supercapacitor with good flexibility and consistency showed excellent rate performance, cycling stability, and mechanical properties. As a demonstration, these tailorable supercapacitors connected in series can be used to drive small gadgets, e.g., a light-emitting diode (LED) and a minimotor propeller. As simple as it is (electrochemical deposition, stencil printing, etc.), this technique can be used in wearable electronics and miniaturized device applications that require arbitrarily shaped energy storage units.
†Division of Energy and Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China.
Binghe
B
Xie
†Division of Energy and Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China.
Cheng
C
Yang
†Division of Energy and Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China.
Zhexu
Z
Zhang
†Division of Energy and Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China.
Peichao
P
Zou
‡School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332, United States.
Ziyin
Z
Lin
§School of Chemistry, Tsinghua University, Beijing 100084, People's Republic of China.
Gaoquan
G
Shi
†Division of Energy and Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China.
Quanhong
Q
Yang
†Division of Energy and Environment, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, People's Republic of China.
Feiyu
F
Kang
‡School of Materials Science and Engineering, Georgia Institute of Technology, 771 Ferst Drive, Atlanta, Georgia 30332, United States.
Ching-Ping
CP
Wong
D025802:Electric Capacitance; D011211:Electric Power Supplies; D004566:Electrodes; D004581:Electronics; D006108:Graphite / Q000737:chemistry*
D006108:Graphite
graphene; supercapacitor; tailorable