Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 4, Issue 15, Pages 5623-5631Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ta00830e
Keywords
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Funding
- National Basic Research Program of China (973 Program) [2012CB933703]
- National Natural Science Foundation of China [91233204, 51272041, 61201107, 11304035, 51572045]
- 111 Project [B13013]
- Fundamental Research Funds for the Central Universities [12SSXM001]
- Natural Science Foundation of Jilin Province of China [20160101313JC]
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Recently, hierarchically porous carbon materials with advantages of hierarchical porosity and large specific surface areas exhibiting desirable capacitive performance have been widely investigated. Herein, a facile and template-free phase separation methodology has been presented to prepare three-dimensional freestanding hierarchically porous carbon (HPC) materials. Importantly, the as-fabricated HPC with highly uniform and well-interconnected pores can afford plentiful transport channels for rapid diffusion of more ions, and the highly conductive cross-linked backbones ensure fast electron transfer, both of which can greatly reduce the internal resistance and improve the electrochemical properties. As expected, the as-fabricated HPC-based supercapacitor has achieved outstanding electrochemical performance with a high cell capacitance of 51 F g(-1) at a current density of 0.5 A g(-1), good rate capability with 75% capacitance retention of initial capacitance at 32 A g(-1) as well as a maximum energy density of 4.5 W h kg(-1) at 200 W kg(-1) and a maximum power density of 15 100 W kg(-1) at 3.4 W h kg(-1). More significantly, a remarkable cycling stability almost without capacitance loss after the 50 000 charge/discharge test at 5 A g(-1) has been achieved for the HPC-based supercapacitors. All these results suggest that the as-synthesized HPC has great potential for application not only as a supercapacitor electrode but also as a substrate for supporting capacitive materials.
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