Electrochemical CaC -Mediated Conversion of Biochar to C H : High Carbon Efficiency and Low Contamination.

The carbon to CaC route is promising to provide a sustainable elementary unit, C H , for the organic synthesis industry, but the traditional thermal reaction process suffers from low carbon efficiency, harmful gas contamination, high temperature operation, and risky CO management. We herein report a high carbon efficiency (ca. 100 %) conversion of biochar to C H through an electrolytic synthesis of solid CaC in molten CaCl /KCl/CaO at 973 K.