Promising electrochemical study of titanate based anodes in direct carbon fuel cell using walnut and almond shells biochar fuel
2019-06-21T10:47:58Z (GMT) by
The direct carbon fuel cell (DCFC) is an efficient device that converts the carbon fuel directly into electricity with 100% theoretical efficiency contrary to practical efficiency around 60%. In this paper four perovskite anode materials La0.4Sr0.6M0.09Ti0.91O3-δ (M ¼ Ni, Fe, Co, Zn) have been prepared using sol-gel technique to measure the performance of the device using solid fuel. These materials have shown reasonable stability and conductivity at 700 �C. Further structural analysis of as-prepared anode material using XRD technique reveals a single cubic perovskite structure with average crystallite size roughly 47 nm. Walnut and almond shells biochar have also been examined as a fuel in DCFC at the temperature range 400–700 �C. In addition, Elemental analysis of walnut and almond shells has shown high carbon content and low nitrogen and sulfur contents in the obtained biochar. Subsequently, the superior stability of as-prepared anode materials is evident by thermogravimetric analysis in pure N2 gas atmosphere. Conversely, the LSFT anode has shown the highest electronic conductivity of 7.53Scm 1 at 700 �C. The obtained power density for LSFTO3-δ composite anode mixed in sub-bituminous coal, walnut and almond shells biochar is of 68, 55, 48 mWcm 2 respectively. A significant improvement in performance of DCFC (78 mWcm 2) was achieved.