Phase evolution in calcium molybdate nanoparticles as a function of synthesis temperature and its electrochemical effect on energy storage

被引：54

作者：

Minakshi, Manickam ^{[1
,2
]}

Mitchell, David R. G. ^{[3
]}

Baur, Christian ^{[2
]}

Chable, Johann ^{[2
]}

Barlow, Anders J. ^{[4
]}

Fichtner, Maximilian ^{[2
]}

Banerjee, Amitava ^{[5
]}

Chakraborty, Sudip ^{[5
]}

Ahuja, Rajeev ^{[5
,6
]}

机构：

[1] Murdoch Univ, Engn & Informat Technol, Murdoch, WA 6150, Australia

[2] Helmholtz Inst Ulm Electrochem Energy Storage HIU, D-89081 Ulm, Germany

[3] Univ Wollongong, Australian Inst Innovat Mat, Electron Microscopy Ctr, Innovat Campus, North Wollongong, NSW 2500, Australia

[4] La Trobe Univ, Ctr Mat & Surface Sci, Bundoora, Vic 3086, Australia

[5] Uppsala Univ, Mat Theory Div, Condensed Matter Theory Grp, Dept Phys & Astron, S-75120 Uppsala, Sweden

[6] Royal Inst Technol KTH, Dept Mat & Engn, Appl Mat Phys, S-10044 Stockholm, Sweden

来源：

NANOSCALE ADVANCES | 2019年 / 1卷 / 02期

基金：

澳大利亚研究理事会; 瑞典研究理事会;

关键词：

ELECTRODE MATERIALS; CAMOO4;

D O I：

10.1039/c8na00156a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The design of a suitable electrode is an essential and fundamental research challenge in the field of electrochemical energy storage because the electronic structures and morphologies determine the surface redox reactions. Calcium molybdate (CaMoO4) was synthesized by a combustion route at 300 degrees C and 500 degrees C. We describe new findings on the behaviour of CaMoO4 and evaluate the influence of crystallinity on energy storage performance. A wide range of characterization techniques was used to obtain detailed information about the physical and morphological characteristics of CaMoO4. The characterization results enable the phase evolution as a function of the electrode synthesis temperature to be understood. The crystallinity of the materials was found to increase with increasing temperature but with no second phases observed. Molecular dynamics simulation of electronic structures correlated well with the experimental findings. These results show that to enable faster energy storage and release for a given surface area, amorphous CaMoO4 is required, while larger energy storage can be obtained by using crystalline CaMoO4. CaMoO4 has been evaluated as a cathode material in classical lithium-ion batteries recently. However, determining the surface properties in a sodium-ion system experimentally, combined with computational modelling to understand the results has not been reported. The superior electrochemical properties of crystalline CaMoO4 are attributed to its morphology providing enhanced Na+ ion diffusivity and electron transport. However, the presence of carbon in amorphous CaMoO4 resulted in excellent rate capability, suitable for supercapacitor applications.

引用

页码：565 / 580

页数：16