Breaking the Limits of Ionic Liquid‐Based Supercapacitors: Mesoporous Carbon Electrodes Functionalized with Manganese Oxide Nanosplotches for Dense, Stable, and Wide‐Temperature Energy Storage

Manganese oxide (MnO 2 ) nanosplotches (NSs) are deposited on N‐ and S‐doped ordered mesoporous carbon (N,S‐CMK‐3) essentially blocking microporosity. The obtained N,S‐CMK‐3/MnO 2 composite materials are assembled into ionic liquid (IL)‐based symmetric supercapacitors, which exhibit a high specific capacitance of 200 F g −1 (0–3.5 V) at a scan rate of 2 mV s −1 , and good rate stability with 55.5% capacitance retention at a scan rate of 100 mV s...