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Layered H2Ti6O13‐Nanowires: A New Promising Pseudocapacitive Material in Non‐Aqueous Electrolyte

Layered H2Ti6O13‐nanowires are prepared using a facile hydrothermal method and their Li‐storage behavior is investigated in non‐aqueous electrolyte. The achieved results demonstrate the pseudocapacitive characteristic of Li‐storage in the layered H2Ti6O13‐nanowires, which is because of the typical nanosize and expanded interlayer space. The as‐prepared H2Ti6O13‐nanowires have a high capacitance of 828 F g−1 within the potential window from 2.0 to 1.0 V (vs. Li/Li+). An asymmetric supercapacitor with high energy density is developed successfully using H2Ti6O13‐nanowires as a negative electrode and ordered mesoporous carbon (CMK‐3) as a positive electrode in organic electrolyte. The asymmetric supercapacitor can be cycled reversibly in the voltage range of 1 to 3.5 V and exhibits maximum energy density of 90 Wh kg−1, which is calculated based on the mass of electrode active materials. This achieved energy density is much higher than previous reports. Additionally, H2Ti6O13//CMK‐3 asymmetric supercapacitor displays the highest average power density of 11 000 W kg−1. These results indicate that the H2Ti6O13//CMK‐3 asymmetric supercapacitor should be a promising device for fast energy storage.