Ionic conducting properties and fuel cell performance developed by band structures
journal contributionposted on 2019-03-26, 14:28 authored by K. Sivajee Ganesh, Baoyuan Wang, Jung-Sik Kim, Bin Zhu
: The layer-structure transition-metal oxides have good triple H+ / O2−/e− charge transport which can promote redox reactions and enhance fuel cell performance. This work has developed ionic transport property based on the layer-structure LiCoO2 (LCO) by tuning the energy band structure with Mg doping also applied for the electrolyte in high-performance lowtemperature solid oxide fuel cells (LT-SOFCs). Mg-doped LiCoO2 exhibited a hexagonal-layered structure with the R3m space group. By doping LiCoO2, its band gap was reduced from 2.65 to 2.24 eV. Electrochemical impedance analysis revealed that Mg-doped LCO (LMCO) significantly reduces the polarization loss (charge-transfer resistance) from 0.85 to 0.5 Ω cm2 at 600 °C; the power output of the fuel cell devices improved from 0.5 to 0.7 W/cm2 , resulting also in better operation durability. Various characterizations on structural and electrochemical properties were conducted. The mechanism was further discussed in relation with the band structure
The authors thank the financial support from the National Natural Science Foundation of China (grant 51772080 and 51502084), the Swedish Research Council (VR, contract no. 621-2011-4983), and the EC FP7 TriSOFC project (contract no. 303454).
- Aeronautical, Automotive, Chemical and Materials Engineering
- Aeronautical and Automotive Engineering