Rational design of surface defects on manganese dioxide and tungsten carbide heterostructure electrode for robust and high-performance aqueous asymmetric supercapacitors
學年 113
學期 2
出版（發表）日期 2025-02-28
作品名稱 Rational design of surface defects on manganese dioxide and tungsten carbide heterostructure electrode for robust and high-performance aqueous asymmetric supercapacitors
作品名稱（其他語言）
著者 Ranjith Kumar Dharman; Athibala Mariappan; Pandian Mannu; Chung-Li Dong; Tae Hwan Oh
單位
出版者
著錄名稱、卷期、頁數 Journal of Power Sources 630, 236153
摘要 The development of manganese oxide (MnO2) as an effective electrochemical storage material is hindered by its inherent weak conductivity and slow ion transfer kinetics. Therefore, constructing defects in MnO2 is a beneficial technique to overcome those obstacles by controlling the atomic level electrical structure and enhancing the electrochemical capability. In this work, surface-defective MnO2 and WC (MnO2@WC) electrode were prepared using a facile co-precipitation method for asymmetric supercapacitor applications. The introduction of oxygen vacancies into the material improved its conductivity and reaction kinetics, resulting in increased capacitance. The X-ray absorption spectroscopy result revealed that the coordination number of the Mn-O was reduced in MnO2@WC, leading to improved oxygen vacancies. The MnO2@WC heterostructure electrode exhibited an efficient specific capacitance of 590.6 F g−1 at 1 A g−1. The outstanding capacitive behavior of the as-prepared electrode arose from the formation of surface defects in MnO2, which facilitated numerous active sites and rapid electron transfer, thereby boosting the electrochemical performance. An asymmetric (AC//MnO2@WC) supercapacitor was fabricated, and its performance was evaluated to further verify its feasibility. The asymmetric supercapacitor with aqueous electrolyte exhibits stability (97.2 % capacity retention after 10,000 cycles) with 39.2 Wh Kg−1, 842.65 W kg−1 energy, and power densities.
關鍵字
語言 en
ISSN 0378-7753; 1873-2755
期刊性質 國外
收錄於 SCI
產學合作
通訊作者
審稿制度 是
國別 NLD
公開徵稿
出版型式 ,電子版,紙本
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機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/129531 )