Tuning La 2 O 3 to high ionic conductivity by Ni-doping.
Faze WangEnyi HuJun WangLei YuSoonpa HongJung-Sik KimBin ZhuPublished in: Chemical communications (Cambridge, England) (2022)
Ni-doped La 2 O 3 was developed as an ionic conducting membrane corresponding to a conductivity of 0.187 S cm -1 at 550 °C. A peak power density of 970 mW cm -2 with an open circuit voltage of 1.05 V was achieved using 10 mol% Ni-doped La 2 O 3 (10NLO). XPS and Raman investigations reveal that the performance enhancement is due to the high concentration of oxygen vacancies. Density functional theory calculations verify that Ni doping can tune the band structure of La 2 O 3 to enhance its electrochemical performance. A Schottky junction barrier is formed at the anode to avoid short circuit problems and facilitate the ionic transportation at the anode/electrolyte interface. This study indicates that wide-band gap semiconductors with suitable element-doping can be tuned to be promising ionic conductors for advanced fuel cell applications.
Keyphrases
- transition metal
- ionic liquid
- density functional theory
- metal organic framework
- solid state
- ion batteries
- molecular dynamics
- quantum dots
- single cell
- reduced graphene oxide
- mental health
- highly efficient
- gold nanoparticles
- cell therapy
- dna methylation
- visible light
- mesenchymal stem cells
- label free
- mass spectrometry
- molecularly imprinted
- monte carlo
- raman spectroscopy