posted on 2020-03-05, 13:03authored byMinjian Ma, Jinshuo Qiao, Xiaoxia Yang, Chunming Xu, Rongzheng Ren, Wang Sun, Kening Sun, Zhenhua Wang
In
this work, we investigate a novel A-site ordered layered perovskite
oxide, (PrBa)0.95Fe1.8–xCuxNb0.2O5+δ (PBFCN), as an anode material for hybrid direct carbon fuel cells
(HDCFCs). We study the effect of anode composition on the electrochemical
performance of HDCFCs. The electrolyte-supported single cell with
(PrBa)0.95Fe1.4Cu0.4Nb0.2O5+δ (PBFCu0.4N) anode achieves the highest
peak power density of 431 mW cm–2 at 800 °C
with activated carbon as the fuel. Moreover, a power generation unit
is also made to demonstrate the practical utilization of PBFCN, which
delivers a peak power of 0.51 W at 800 °C without any carrier
gas, and a small fan can operate for more than 10 h by using the as-fabricated
HDCFC as a power generation unit. The PBFCN anode achieves
greatly enhanced catalytic activity by improving the chemical adsorption
and electrochemical oxidation of CO at the anode/CO interface, which
is mainly due to the high-activity Cu ions in PBFCN. The inactive
element Nb doping and ordered layered structure endow the material
with excellent redox structural stability. The present study provides
a new idea for the design and development of high-performance anode
materials for HDCFCs applications.