Carbon derived from treated rice husk as fuel for direct carbon fuel cells

Abstract

Summary Direct carbon fuel cell (DCFC), as an environmentally friendly technology, strives to reduce polluting gas emissions, in the meanwhile, which can raise the value of preferably sustainable resources. In this work, an abundant and cheap resource‐rice husk is selected as fuel and treated with HCl, citric acid, and NaOH to evaluate the application in Solid Oxide (SO)‐DCFC. Co‐treatment of acid and alkali removes the ash and increases the carbon content of rice husk, and also introduces the oxygen‐containing functional groups on the surface, thus cell performance is enhanced. In particular, the cell using acid and alkali co‐treated husk carbon is capable of operating up to 100 hours under 0.7 V at 750°C.