A Thermally Chargeable Supercapacitor based on the g‐C₃N₄‐Doped PAMPS/PAA Hydrogel Solid Electrolyte and 2D MOF@Ti₃C₂T<i>_x</i> MXene Heterostructure Composite Electrode

With the development of individual wearable electronics, requirements self-energy harvest devices from human skin or motion have increased. A thermal device that receives energy naturally existed in is more attractive than a mechanical harvester needs walking. Herein, thermal-chargeable supercapacitor (TCSC) proposed, which can convert into electrical and then store only by occurring temperature difference between two ends TCSC. The all-solid-state g-C3N4-modified hydrogel electrolyte TCSC provides free protons for proton migration electrostatic interaction hydrogen bond g-C3N4 acid group. 2D [email protected]3C2Tx MXene heterojunction electrodes with advantages large pore size, adjustable abundant REDOX sites MOFs, high conductivity Ti3C2Tx also ensure performance As result, assembled exhibits excellent ionic thermal-voltage (55.68 mV), Seebeck coefficient (18.56 mV K−1), exchange efficiency (3.4%) upon 3 K, successfully drives pressure sensor work.