Enhanced Capacitance and Desalination Performance with Plasma‐Activated Biochar Electrodes

Derived from electric double-layer capacitors (EDLCs), capacitive deionization (CDI) using symmetric carbon-based electrodes is an emerging approach to purifying brackish water into drinking water. The performance mainly determined by the properties of electrode materials. This work reports a green and efficient plasma treatment for activating raw biochar, which subsequently used as material both EDLCs CDI. Oxygen activation effectively modulates surface charge, morphology, functional groups. Biochar treated with oxygen exhibits pronounced improvement in supercapacitor specific capacitance 80 97.5 F g−1 1.2 times higher desalination capacity comparison biochar. Plasma can be effective strategy improving