4.7 Article

New insight into the effect of oxygen vacancies on electrochemical performance of nickel-tin oxide/reduced graphene oxide composite for asymmetric supercapacitor

期刊

JOURNAL OF ENERGY STORAGE
卷 62, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.est.2023.106922

关键词

Ni; Sn oxide; Oxygen vacancy; Strain; Asymmetric supercapacitor; Energy density

向作者/读者索取更多资源

Creating oxygen vacancies (OVs) on transition metal oxides can enhance electrochemical activities. A Ni-Sn oxide/reduced graphene oxide (NSG) composite with abundant OVs was prepared via hydrothermal method. The resulting asymmetric supercapacitor device exhibited the highest energy density and excellent cycling stability at a certain power density.
Limited electrochemical active sites and high electrical resistivity of transition metal oxides deteriorate the electrochemical activities. Oxygen vacancies (OVs) creation in transition metal oxides has been used to expose more electrochemically active sites. NaBH4 is widely used as an oxygen scavenging agent which creates oxygen vacancies by removing the oxygen atoms bonded with the metal. Herein, Ni-Sn oxide/reduced graphene oxide (NSG) composite with abundant OVs was successfully prepared via hydrothermal method. OV-NSG 2 exhibited the highest specific capacitance of-1800 F g-1 at 2 A g-1 current density. The fabricated asymmetric super-capacitor device consisting of OV-NSG 2 as positive electrode and sonochemically reduced graphene oxide as the negative electrode exhibited the highest energy density of-41.04 W h kg-1 at a power density of-1.476 kW kg-1. The retention of energy density was found to be-60 % when the power density increased to-2.432 kW kg-1. The device showed-80 % capacitance retention after 10,000 continuous GCD cycles. Two ASC devices connected in series could power a 1.8 V red LED light for-1 min.

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。

评论

主要评分

4.7
评分不足

次要评分

新颖性
-
重要性
-
科学严谨性
-
评价这篇论文

推荐

暂无数据
暂无数据