Rational design and synthesis of hydrotalcite-like α-Co(OH)2 nanoflakes for extrinsic pseudocapacitive electrodes with superb cycling stability

被引：19

作者：

Gong, Weizhi ^{[1
]}

Wang, Mingjun ^{[1
,2
]}

An, Yi ^{[1
]}

Wang, Junli ^{[1
,2
]}

Zhou, Liexing ^{[2
]}

Xia, Yi ^{[2
]}

Wang, Chunjian ^{[2
]}

Dong, Kun ^{[2
]}

Pan, Cheng ^{[1
]}

Zhou, Rongfeng ^{[1
,2
]}

机构：

[1] Kunming Univ Sci & Technol, Fac Mat Sci & Engn, Kunming 650093, Yunnan, Peoples R China

[2] Analyt & Testing Res Ctr Yunnan, Kunming 650093, Yunnan, Peoples R China

来源：

JOURNAL OF ENERGY STORAGE | 2021年 / 38卷 / 38期

关键词：

alpha-Co(OH)(2); Cycling stability; Extrinsic pseudocapacitance; Supercapacitor; ELECTROCHEMICAL PERFORMANCE; FILMS; NANOCOMPOSITE; PHASE;

D O I：

10.1016/j.est.2021.102579

中图分类号：

TE [石油、天然气工业]; TK [能源与动力工程];

学科分类号：

0807 ; 0820 ;

摘要：

Cycling stability and specific capacitance are two of important performance parameters for pseudocapacitive electrodes under frequent charging and discharging. Herein, we present a facile solvothermal approach to rationally design and fabricate chiffon-like and hydrotalcite-like alpha-Co(OH)(2) nanoflakes for extrinsic pseudocapacitive electrode, which exhibits linear galvanostatic discharge behavior and superior charge-storage performance, including high capacitance of 475 F g(-1) at 1 A g(-1), excellent rate capability and superb cycling stability with capacitance retention of 93.9% after 10000 cycles at 10 A g(-1). The superior performance is mostly attributed to the good electrical conductivity and stable microstructure of the hydrotalcite-like alpha-Co(OH)(2) nanoflakes and the abundant redox active sites on the chiffon-like nanoflakes with short and facile electron transport. In addition, other alpha-Co(OH)(2) samples with different morphologies and size as contrast are prepared and discussed, indicating that the morphology/size design and optimization of the alpha-Co(OH)(2) could greatly improve the electrochemical energy-storage performance. The findings demonstrate that the chiffon-like and hydrotalcite-like alpha-Co(OH)(2) nanoflakes have a great practical application potential in long-life and highperformance supercapacitors. This study also presents a facile way to design and prepare nanoflake-like materials with adjustable lateral size and thickness from spherical morphology consisting of nanoflakes.

引用

页数：9