期刊
APPLIED SURFACE SCIENCE
卷 558, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2021.149853
关键词
Hydrothermal carbon (HTC); Amino acid; L-glutamic acid; Binder-free electrode; Supercapacitor
类别
资金
- Shanghai Alliance Plan [LM201751, LM201881]
- Shanghai Natural Science Foundation [13ZR1411900]
- Shanghai Leading Academic Discipline Project [B502]
- Shanghai Key Laboratory Project [08DZ2230500]
- National Natural Science Foundation of China [22075082]
This study reports the preparation of binder-free electrodes composed of nanostructured NiO/Ni(OH)2 covered with pseudo-capacitive materials loaded on a conductive substrate through a one-step hydrothermal process using amino acids as the carbon source. The resulting electrode showed battery-like behavior and outstanding charge/discharge performances, with a specific capacitance of 2586 F g-1 at 2.8 A g-1 and excellent stability with 91.30% retention after 20,000 cycles.
Binder-free nano-sized structure composed of pseudocapacitive materials covered by carbon is concerned to be the next-generation electrode for supercapacitor due to the avoidance of binder and additional electrode preparation, high capacitance of the pseudocapacitive materials, and high conductivity of carbon. Here, a serial of amino acids chosen as hydrothermal carbon (HTC) source were loaded on conductive substrate surface of Ni foam (NF), which constructed binder-free electrodes by a one-step hydrothermal process. Because of its weak oxidative and acid properties, an in-situ redox reaction occurred in the existence of L-glutamic acid, in which Ni is also simultaneously converted into nanostructured NiO/Ni(OH)2 (HTC/NiO/Ni(OH)2@NF). It is discovered that HTC/NiO/Ni(OH)2@NF electrode derived from L-glutamic acid at 2 g L-1 and 160 degrees C exhibited a battery-like behavior and superior charge/discharge performances, i.e., a specific capacitance of 2586 F g-1 (1293 C g-1) at 2.8 A g-1, and an excellent stability of 91.30% retention after 20,000 cycles.
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