La3+掺杂NiCo层状双金属氢氧化物纳米片的合成及其电化学性能

doi:10.11944/j.issn.1000-0518.2017.01.160455

摘要/Abstract

摘要：

稀土离子La³⁺掺杂的NiCo层状双金属氢氧化物纳米片具有高的超级电容器性能,比容量达到1115 F/g(1A/g)、倍率性能为517 F/g(30 A/g)。研究表明,La³⁺离子掺杂不改变NiCo层状双金属氢氧化物晶体结构,但会显著影响其电子和离子传导特性,从而改变其电化学性能。根据离子电负性标度,La³⁺(1.327)和Co²⁺(1.377)离子的电负性值最接近,掺杂La³⁺会优先取代Co²⁺离子位置。由于La³⁺离子的尺寸作用(106 pm),使得最优掺杂比例较小仅为0.26%,电化学结果表明较少的La³⁺掺杂比例依然会显著调节NiCo层状双金属氢氧化物的电子/离子输运性质。

关键词: 层状氢氧化物, 稀土离子, 掺杂, 超级电容器

Abstract:

NiCo layered double hydroxides(NiCo-LDHs) are important electrode materials in batteries and supercapacitors, due to its layered structure and controllable ratio and kind of metal ions. In this paper, we studied the effect of La³⁺ ions on the crystal structures and electrochemical performances of NiCo-LDHs. According to ionic electronegativity, the values of La³⁺(1.327) and Co²⁺(1.377) are similar, leading to the replace of Co²⁺ by La³⁺ in La³⁺-doped NiCo-LDHs. La³⁺-doped NiCo-LDHs show high specific capacitance and rate performance, 1115 F/g at 1 A/g and 517 F/g at 30 A/g, respectively. XRD, FTIR and SEM prove that La³⁺ doping does not change the structures of NiCo-LDHs. However, CV and electrochemical impendence spectrum confirms that the nature of electron or ion transfer is adjusted by La³⁺ doping. Owing to the size effect of La³⁺ ions, the optimized ratio of La doping is 0.26%. La³⁺ ions doping in electrode materials can be a promising method to change their nature of electron or ion transfer(electron or ion conductivity).

Key words: layered double hydroxide, rare earth ion, doping, supercapacitor

李宫, 陈昆峰, 金京一, 薛冬峰. La³⁺掺杂NiCo层状双金属氢氧化物纳米片的合成及其电化学性能[J]. 应用化学, 2017, 34(1): 71-75.

LI Gong, CHEN Kunfeng, JIN Jingyi, XUE Dongfeng. La³⁺-doped NiCo Layered Double Hydroxide Nanosheets and Their Supercapacitive Performance[J]. Chinese Journal of Applied Chemistry, 2017, 34(1): 71-75.

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La³⁺掺杂NiCo层状双金属氢氧化物纳米片的合成及其电化学性能

La³⁺-doped NiCo Layered Double Hydroxide Nanosheets and Their Supercapacitive Performance

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