Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 6, Issue 35, Pages 17057-17066Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta05853a
Keywords
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Funding
- Research Grants Council of Hong Kong [T23-407/13-N]
- National Key Basic Research Program of China [2014CB932400]
- Joint Fund of the National Natural Science Foundation of China [U1401243]
- National Nature Science Foundation of China [51232005]
- Shenzhen Technical Plan Project [JCYJ20150529164918735, CYJ20170412170911187, QJSCX20160226191136]
- Guangdong Technical Plan Project [2015TX01N011]
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Li ion capacitors (LICs) are emerging as a promising device to integrate the high power density of supercapacitors with the high energy density of Li ion batteries. However, the insufficient specific capacity of the conventional capacitive electrode presents a great challenge in achieving high energy density for LICs. Herein, we demonstrate the synthesis of hierarchical porous carbon with an extremely large specific surface area of 3898 m(2) g(-1) and an improved graphitization degree by using egg white biomass as a precursor and NaCl as a template, in which dual functional NaCl served both as a macropore creating template and a graphitic catalyst to enhance the graphitization degree. With rational design, the developed porous carbon exhibits a noticeably enhanced specific capacity of 118.8 mA h g(-1) at 0.1 A g(-1) with excellent rate capability and improved cycling stability over 4000 cycles in an organic Li ion conducting electrolyte. Furthermore, the obtained porous carbon was employed as a cathode paired with a Fe3O4@C anode for LIC applications, which delivers an integrated high energy density of 124.7 W h kg(-1) and a power density of 16984 W kg(-1) as well as a superior capacity retention of 88.3% after 2000 cycles at 5 A g(-1), demonstrating the promising application as potential electrode candidates for efficient energy storage systems.
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