期刊
NANOTECHNOLOGY
卷 29, 期 27, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1361-6528/aabeb3
关键词
ZnO template; catalytic conversion; carbon-bubble foams; supercapacitors; hierarchical pores
资金
- Fundamental Research Funds for the Central Universities [531107040992]
- National Natural Science Foundation of China [51702095, 11574078, 11274107, 61204109]
- Collaborative Innovation Center of Intelligent New Energy Vehicle
- Hunan Collaborative Innovation Center for Green Car
- Arizona State University
- National Science Foundation [CHE-1465057]
- Hunan Provincial Innovation Foundation for Postgraduate [CX2017B136]
- Direct For Mathematical & Physical Scien [1465057] Funding Source: National Science Foundation
Design and synthesis of integrated, interconnected porous structures are critical to the development of high-performance supercapacitors. We develop a novel and facile synthesis technic to construct three-dimensional carbon-bubble foams with hierarchical pores geometry. The carbon-bubble foams are fabricated by conformally coating, via catalytic decomposition of ethanol, a layer of carbon coating onto the surfaces of pre-formed ZnO foams and then the removal of the ZnO template by a reduction-evaporation process. Both the wall thickness and the pore size can be well tuned by adjusting the catalytic decomposition time and temperature. The as-synthesized carbon-bubble foams electrode retains 90.3% of the initial capacitance even after 70 000 continuous cycles under a high current density of 20 A g(-1), demonstrating excellent long-time electrochemical and cycling stability. The symmetric device displays rate capability retention of 81.8% with the current density increasing from 0.4 to 20 A g(-1). These achieved electrochemical performances originate from the unique structural design of the carbon-bubble foams, which provide not only abundant transport channels for electron and ion but also high active surface area accessible by the electrolyte ions.
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