Role of Ce3+ valence state and surface oxygen vacancies on enhanced electrochemical performance of single step solvothermally synthesized CeO2 nanoparticles

被引：99

作者：

Kumar, Manjeet ^{[1
]}

Yun, Ju-Hyung ^{[1
,2
]}

Bhatt, Vishwa ^{[1
]}

Singh, Bikramjeet ^{[2
]}

Kim, Joondong ^{[1
]}

Kim, Joohn-Sheok ^{[1
]}

Kim, Byung Soo ^{[3
]}

Lee, Chang Yeon ^{[4
]}

机构：

[1] Incheon Natl Univ, Dept Elect Engn, Incheon 406772, South Korea

[2] NEES SYST Inc, 119 Acad Rd, Incheon 406772, South Korea

[3] Incheon Natl Univ, Dept Ind & Management Engn, Incheon 406772, South Korea

[4] Incheon Natl Univ, Dept Energy & Chem Engn, 119 Acad Ro, Incheon 22012, South Korea

来源：

ELECTROCHIMICA ACTA | 2018年 / 284卷

基金：

新加坡国家研究基金会;

关键词：

CeO2; Supercapacitors; Rietveld refinement; Surface oxygen vacancies; REDUCED GRAPHENE OXIDE; SENSITIZED SOLAR-CELLS; SUPERCAPACITOR ELECTRODES; FACILE SYNTHESIS; IMPEDANCE SPECTROSCOPY; CERIUM OXIDE; CO OXIDATION; THIN-FILMS; NANOCOMPOSITES; TRANSPORT;

D O I：

10.1016/j.electacta.2018.07.184

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In this article, different sized CeO2 nanoparticles were synthesized using one step low-cost solvothermal method with various reaction time. Defect states were induced due to the reduction of Ce4+ into Ce3+ valence state. X-ray photoelectron spectroscopy results recommend that Ce3+ valence states and defects in the form of oxygen vacancies be present on the surface of CeO2 nanoparticles. Such availability of oxygen vacancies provided high specific capacitance 142.5 Fg(-1) at a current density of 0.25 Ag-1 in three electrode system using 1M Na2SO4 electrolyte. There is an increase in faradaic reactions taken place on the surface which is attributed to the high surface area, more oxygen vacancies, and increased diffusion rate. The highest energy density is obtained to be similar to 12.68 Wh/kg, and the stability result confirmed that the capacitance retention is similar to 75% after 1000 cycles of operation. These results indicate that CeO2@20h NPs is a potential candidate as electrode materials for supercapacitor applications due to their fast mutation between Ce4+ to Ce3+ oxidation state. (c) 2018 Elsevier Ltd. All rights reserved.

引用

页码：709 / 720

页数：12

共 67 条

[1] Hierarchical multidimensional MnO2 via hydrothermal synthesis for high performance supercapacitors [J].