▎ 摘　　要

NOVELTY - A carbon isotope (13C) sensor based on ion concentration difference battery and its preparation method, includes a sensitive device, a transfer device and a conversion circuit, which combines sensitive device and transfer device. The sensor is prepared by setting the sensitive devices as electrodes in left and right electrolyte pools respectively, preparing the transfer device, filling electrolyte pool with activated carbon particles and copper sulfate electrolyte and lighting, using preset relation to transform copper sulfate concentration induced by graphene electrode into corresponding potential difference, and converting sensed potential difference into an open circuit voltage or current through a voltage or current detector and a conversion circuit to obtain a corresponding electrical signal. USE - Carbon isotope sensor based on ion concentration difference battery. ADVANTAGE - The sensor is capable of realizing simultaneous adsorption of activated carbon on 13C-labeled carbon dioxide and cupric ions under light, and reusing only allow cupric ions to pass through.