Nucleophilic hydrolysis enables HF-etched MXene kilofarad specific capacitance and excellent rate performance†
Bingqing
Hu, 
a
Jiabiao
Lian
*c
and
a
Jiabiao
Lian
*c
and
Abstract
Here, an unusual MXene with a high ratio of oxygen functional groups was prepared by hydrothermal treatment of HF-etched MXene in aqueous KOH solution. The prepared MXene (H-220) exhibits ultrahigh specific capacitance (1030 F g−1 in a potential window of 0.85 V), and excellent rate and cycling performance simultaneously in a sulfuric acid electrolyte, and can act as an anode material of proton batteries.
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