量子点
钴
层状双氢氧化物
电容
超级电容器
电极
镍
化学工程
电导率
纳米技术
化学
材料科学
无机化学
冶金
氢氧化物
物理化学
工程类
作者
Qi Chen,Hui Pan,Zhuo Chen,Xueliang Jiang,Yao Li,Wensheng Tian,Fei Liu,Shenmin Zhu
标识
DOI:10.1016/j.jcis.2023.10.114
摘要
Transition metal layered double hydroxides have extremely high specific capacitances but suffer from poor rate performance and cycling stability due to their low conductivity and structural stability. In this study, cobalt-coordinated carbon quantum dots (CoCQDs) were designed and synthesized to enhance the energy storage performance of nickel–cobalt layered double hydroxides (NiCo-LDH). Nickel and cobalt ions were co-electrodeposited with the CoCQDs to form a NiCo-LDH based composite electrode (denoted as CoC@LDH). Since the CoCQDs participated in the formation of the NiCo-LDH, the carbon quantum dots could be strongly bonded to the NiCo-LDH nanosheets through coordination interactions. Thus, the conductivity as well as the structure stability of the NiCo-LDH was effectively improved, which greatly boosted the cycle stability and rate performance of the NiCo-LDH. Several CoCQDs with different Co contents (nCoCQDs, n = 0.5, 1.0, 2.0) were fabricated and their effects on the performance of the resultant electrodes nCoC@LDH were investigated. The 1.0CoC@LDH electrode exhibited an impressive specific capacitance of 1867 F g–1 at 1 A-g–1, along with a significantly enhanced capacitance retention of 84.6 % after 6000 cycles at 5 A g–1 (benchmark 49.5 %). This ingenious design provides a new avenue for fabricating pseudo-capacitive materials with unprecedented high performance.
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