The MXenes attract great interest in catalytic and energy applications but suffer from inferior redox activity. An efficient strategy is presented to boost the intrinsic electrochemical activity of MXenes for electrocatalysis in various chemical environments by utilizing their plasmonic response to electromagnetic waves. The resulting significant thermoplasmonic effect lowers the endothermic enthalpy and potential barrier to the hydrogen evolution reaction (HER) in the Vis/near‐IR region. Simultaneous hot‐electron injection in a prolonged sub‐femtosecond to picosecond timescale also remarkably facilitates interfacial charge transfer and decreases the activation energy of the reaction. Both effects boost the HER activity of various types of MXenes over fivefold with improved kinetics and Faradaic efficiency over a broad pH range.

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Stable redox chemistry between a Li2S cathode and Si anode in gel polymer electrolyte is utilized to develop quasi-solid-state rechargeable batteries with high energy and superior safety.