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MXenes exhibit excellent capacitance at high scan rates in sulfuric acid aqueous electrolytes, but the narrow potential window of aqueous electrolytes limits the energy density. Organic electrolytes and room‐temperature ionic liquids (RTILs) can provide higher potential windows, leading to higher energy density. The large cation size of RTIL hinders its intercalation in‐between the layers of MXene...
Interlayer Spacing
In article number 2104007, Michael Naguib and co‐workers report the engineering of interlayer spacing of multilayer MXene—by pre‐intercalation of pillars—to host large‐size cations of room temperature ionic liquids in between the layers, achieving high energy density supercapacitors. An optimum interlayer spacing of 2.2 nm (for pre‐intercalated Ti3C2) allows for a capacitance of...
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