Catalyzing oxygen reduction reaction with a worm-like oxide Ca3Co2O6 in solid-oxide fuel cells

• A worm-like oxide Ca3Co2O6 was prepared by electrostatic spinning as a cathode material for solid-oxide fuel cells. Compared to the plain granular structure, the worm-like Ca3Co2O6 exhibits a desirable morphological organization and an enhanced electrochemical performance. At 1073 K, polarization resistance with the worm-like cathode is favorably reduced to 0.151 Ω cm2, and the power peak of the corresponding single cell reaches to 512 mW cm−2, showing a fast cathodic kinetics. By contrast, the polarization resistance with the plain cathode is 0.275 Ω cm2, and the power peak of the corresponding single cell is 406 mW cm−2. Under a constant voltage load of applied 0.6 V at 1023 K, cell power with the worm-like cathode maintains steadily from 420 to 400 mW cm−2 after 14 h of running time, showing a less fading rate, a more stable performance, and a better application prospect than the plain cathode.

Ämnesord

NATURVETENSKAP  -- Kemi -- Materialkemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences -- Materials Chemistry (hsv//eng)

Nyckelord

Solid-oxide fuel cells

Electrochemical performance

Cathode materials

Hexagonal perovskite

Worm-like structure

Material characterization

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