Wireless charging via atmospheric electrostatic induction in supercapacitive MXene: Huge energy-capture, sensitive electric-field- and proximity-sensing

•The electrostatic induction is developed to wirelessly charge supercapacitor.•The entire electrochemical system is excited by permeated electrostatic field.•The wireless charge harvests the greatly larger energy than wire charge.•The electric-field- and proximity-sensing are realized in electrochemical system.