J. Mater. Sci. Technol. ›› 2021, Vol. 93: 157-168.DOI: 10.1016/j.jmst.2021.03.056

• Original article • Previous Articles     Next Articles

Performance of Pr2(Ni,Cu)O4+δ electrodes in protonic ceramic electrochemical cells with unseparated and separated gas spaces

Artem P.Tarutina,b(), Yulia G.Lyagaevaa,b, Aleksey I.Vylkova,b, Maxim Yu.Gorshkova,b, Gennady K.Vdovina, Dmitry A.Medvedeva,b,*()   

  1. aLaboratory of Electrochemical Devices Based on Solid Oxide Proton Electrolytes, Institute of High Temperature Electrochemistry, Yekaterinburg 620137, Russia
    bUral Federal University, Yekaterinburg 620002, Russia
  • Accepted:2021-02-17 Published:2021-12-10 Online:2021-12-10
  • Contact: Artem P.Tarutin,Dmitry A.Medvedev
  • About author:dmitrymedv@mail.ru (D.A. Medvedev).
    *E-mail addresses: vanomass333@gmail.com (A.P. Tarutin),

Abstract:

The Ln2NiO4+δ-based layered phases have attracted much attention as components for high-performance protonic ceramic fuel cells (PCFCs) and electrolysis cells (PCECs) enabling energy conversion with good efficiency and low pollution. The present paper aims at rationally engineering the Cu-doped Pr2NiO4+δ materials and analysing their electrode behaviour for reversible protonic ceramic cells operating in both PCFC and PCEC modes. Complex oxides of Pr2Ni1-xCuxO4+δ (x = 0, 0.1, 0.2 and 0.3) were synthesised using the citrate-nitrate method. The obtained materials were characterised considering their crystalline structures, as well as thermal, thermomechanical and electrotransport properties. A special interest was focused on the quality of an electrode/electrolyte interface governing the electrochemical performance of the cells fabricated. It is shown that a copper doping of x = 0.2 has a positive impact on the thermomechanical compatibility of the Ba(Ce,Zr)O3-based electrolytes, providing a better adhesion to these electrolytes at low-temperature sintering and resulting in a decrease of the polarisation resistance of the air electrodes. A reversible protonic ceramic cell demonstrates a power density of ~340 mW cm-2 and a hydrogen output flux of ~3.8 ml cm-2 min-1 at 750 °С. The presented results propose modernised alkaline-earth-element-free and cobalt-free electrodes that can be successfully used in the electrochemical cells based on the-state-of-the-art proton-conducting electrolytes.

Key words: rSOC, Proton conductivity, Cathode, Cu-doping, Thermal expansion, Impedance spectroscopy