Anomalous Pseudocapacitive Behavior of a Nanostructured, Mixed-Valent Manganese Oxide Film for Electrical Energy Storage
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- Anomalous Pseudocapacitive Behavior of a Nanostructured, Mixed-Valent Manganese Oxide Film for Electrical Energy Storage
- Song, Min-Kyu; Cheng, Shuang; Chen, Haiyan; Qin, Wentao; Nam, Kyung-Wan; Xu, Shucheng; Yang, Xiao-Qing; Bongiorno, Angelo; Lee, Jangsoo; Bai, Jianming; Tyson, Trevor A.; Cho, Jaephil; Liu, Meilin
- Active material; Charge storage; Cycling life; Density functional theory calculations; Double-layer capacitance; Electrical energy; Electrochemical capacitor; Emerging applications; In-situ; Mixed valence state; Mixed-valent; Mixed-valent compounds; Nano-architecture; Nano-structured; Performance enhancements; Power densities; Pseudocapacitance; Pseudocapacitive behavior; Pseudocapacitors; Rational design; Specific capacitance
- Issue Date
- AMER CHEMICAL SOC
- NANO LETTERS, v.12, no.7, pp.3483 - 3490
- While pseudocapacitors represent a promising option for electrical energy storage, the performance of the existing ones must be dramatically enhanced to meet today's ever-increasing demands for many emerging applications. Here we report a nanostructured, rnixed-valent manganese oxide film that exhibits anomalously high specific capacitance (similar to 2530 F/g of manganese oxide, measured at 0.61 A/g in a two-electrode configuration with loading of active materials similar to 0.16 mg/cm(2)) while maintaining excellent power density and cycling life. The dramatic performance enhancement is attributed to its unique mixed-valence state with porous nanoarchitecture, which may facilitate rapid mass transport and enhance surface double-layer capacitance, while promoting facile redox reactions associated with charge storage by both Mn and O sites, as suggested by in situ X-ray absorption spectroscopy (XAS) and density functional theory calculations. The new charge storage mechanisms (in addition to redox reactions of cations) may offer critical insights to rational design of a new-generation energy storage devices.
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