期刊
ELECTROCHIMICA ACTA
卷 273, 期 -, 页码 216-228出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2018.03.136
关键词
Phosphate; Nanocomposites; Energy storage; XPS
资金
- University of Malaya Research Grant [UMRG: RG382-17AFR]
- Postgraduate Research Grant (PPP) [PG034-2015A]
- UGC-Dr D.S. Kothari Postdoctoral Fellowship [F.4-2/2006 (BSR)/EN/15-16/0031]
- Fulbright Fellowship at the Imaging Analysis Center at Princeton University - National Science Foundation MRSEC [DMR-1420541]
The performance of a supercapattery depends on its energy density, rate capability of charge and discharge and stability of electrode. Here in, a sonochemical method followed by calcination was applied to synthesize nickel phosphate-silver phosphate (Ni-3(PO4)(2)eAg(3)PO(4)) nanocomposites. Morphological studies revealed that crystalline Ag3PO4 (similar to 10 nm) was intimately anchored on the surface of amorphous Ni-3(PO4)(2), which benefits efficient charge transfer between the two metal phosphates. The optimized Ni-3(PO4)(2)eAg(3)PO(4) nanocomposite electrode exhibited a significant boost in rate capability from 29% (Ni-3(PO4)(2)) to 78% capacity retention with the maximum specific capacity of 478C/g at 1 A/g in 1M KOH electrolyte. The enhancement of rate capability originated from a more rapid electron-transfer rate and an augmentation of electroactive sites for electrolyte ion diffusion from the interfaces of porous Ni-3(PO4)(2) and an improvement in the electrical conductivity of crystalline Ag3PO4. The fabricated Ni-3(PO4)(2)e Ag3PO4//activated carbon-based supercapattery exhibited an energy density of 32.4 Wh/kg at 399.5 W/kg and excellent cyclic stability (similar to 82% capacity retention after 5000 cycles). (C) 2018 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据