Quantum mechanics

Engineering

Oxide

Electrochemistry

Metallurgy

Materials science

Proton

Ceramic

Durability

Perovskite (structure)

Inorganic chemistry

Chemical engineering

Faraday efficiency

Physical chemistry

Hydrogen

Physics

Organic chemistry

Composite material

Chemistry

Electrode

Hydrogen production

Electrolyte

Electrical conductor

Energy & Environmental Science

We demonstrate excellent performance and durability at intermediate temperatures (500–650 °C) upon reversible operation of an electrochemical cell incorporating a proton-permeable, high-activity mixed conducting oxide as the air electrode, a highly proton-conductive and chemically stable perovskite oxide as the electrolyte, and a composite of Ni and the electrolyte as the fuel electrode.

Protonic ceramic electrochemical cells for hydrogen production and electricity generation: exceptional reversibility, stability, and demonstrated faradaic efficiency