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Oxygen vacancies enhancing capacitance of MgCo2O4 for high performance asymmetric supercapacitors
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2021-02-25 , DOI: 10.1016/j.jallcom.2021.159294
Hongzhi Wang , Nanyang Mi , Shaofeng Sun , Weiguo Zhang , Suwei Yao

Here, we report a facile strategy to synthesize MgCo2O4 with abundant oxygen vacancies (OV-MgCo2O4) using for the electrode materials of asymmetric supercapacitors (ACS). Benefiting from the NaBH4 reduction treatment to offer oxygen vacancies, the specific capacitance of OV-MgCo2O4 was improved to 460 F g−1 (1 A g−1), much higher than untreated MgCo2O4 (340 F g−1 at 1 A g−1). We fabricated OV-MgCo2O4//AC ACS device to investigate the further application of OV-MgCo2O4. This hybrid ACS exhibits excellent specific capacity of 52.5 F g−1 (0.4 A g−1), with a great energy density of 18.7 Wh kg−1 (320 W kg−1). Our work demonstrates the important role of oxygen vacancies in improving the capacity of metal oxides.



中文翻译:

氧空位增强了高性能不对称超级电容器MgCo 2 O 4的电容

在这里,我们报告了一种用于不对称超级电容器(ACS)电极材料的合成方法,该方法具有高的氧空位(OV-MgCo 2 O 4)来合成MgCo 2 O 4。受益于NaBH 4还原处理提供的氧空位,OV-MgCo 2 O 4的比电容提高到460 F g -1(1 A g -1),远高于未处理的MgCo 2 O 4(340 F g)-1在1 A g -1)。我们制造了OV-MgCo 2 O 4// AC ACS设备以研究OV-MgCo 2 O 4的进一步应用。该混合型ACS具有52.5 F g -1(0.4 A g -1)的出色比容量,并且具有18.7 Wh kg -1(320 W kg -1)的大能量密度。我们的工作证明了氧空位在提高金属氧化物容量方面的重要作用。

更新日期:2021-03-03
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