文献类型：期刊文献

英文题名：In situ conversion of sub-4 nm Co(OH)2 nanosheet arrays from phytic acid-derived Co3(HPO4)2(OH)2 for superior high loading supercapacitors

作者：Wang, Shengqi[1];Zhu, Zhaoqiang[1];Li, Pengwei[1];Zhao, Chunhua[1];Zhao, Chongjun[1];Xia, Hui[2]

机构：[1]East China Univ Sci & Technol, Key Lab Ultrafine Mat, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat,Minist Educ, Shanghai 200237, Peoples R China;[2]Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China

年份：2018

卷号：6

期号：41

起止页码：20015

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20184406001221);WOS:【SCI-EXPANDED(收录号:WOS:000448412700014)】；

基金：We are grateful for the support of the Shanghai Natural Science Foundation (No. 13ZR1411900), Shanghai Alliance Plan (No. LM201881, LM201751), Shanghai Leading Academic Discipline Project (B502), and Shanghai Key Laboratory Project (08DZ2230500).

语种：英文

外文关键词：Cathodes - Cobalt - Nanosheets

摘要：Co(OH)(2) is a candidate cathode material for supercapacitors due to its essential features of high theoretical capacity and long cycle life. Herein, by using phytic acid (PA) as an intermediate connector between Co foam substrates and Ni2+ ions, a Ni-PA nanofilm-covered Co-3(HPO4)(2)(OH)(2) precursor was grown in situ on Co foam in the presence of sodium dodecyl sulfonate (SDS). A 3D nanoarchitecture of ultrathin Co(OH)(2) nanosheet arrays was built through the spontaneous in situ conversion of a Co-3(HPO4)(2)(OH)(2) precursor immersed in an alkaline solution. Even with a high loading of 12 mg cm(-2), the as-prepared SDS-modified Ni-PA/Co(OH)(2)@CoF (SNC@CoF) electrodes exhibited a high specific capacitance (Q(m)) of 429 mA h g(-1) (0.42 A g(-1)) and excellent cyclability with 124.3% retention after 20000 cycles. Furthermore, an asymmetric supercapacitor (ASC) using the modified material can deliver a large energy density of 51.3 W h kg(-1) and an outstanding cycle life (96% retention after 20000 cycles).