Efficient intermediate-temperature steam electrolysis with Y : SrZrO₃–SrCeO₃ and Y : BaZrO₃–BaCeO₃ proton conducting perovskites

Abstract

Proton conducting Ba(Zr0.5Ce0.4)8/9Y0.2O2.9 is employed as a potential steam electrolysis electrolyte for hydrogen production at intermediate temperature.

Ferritic stainless steel interconnects for protonic ceramic electrochemical cell stacks: Oxidation behavior and protective coatings

“…electrolyzers for high temperature water splitting and for co-electrolysis of CO2 and H2O [9][10][11][12].To split water, steam is supplied to the oxygen electrode of the PCEC and dry hydrogen is produced in the fuel electrode, so removal of steam from hydrogen is not needed, and electrochemical compression of H2 can be achieved [4,5]. For co-electrolysis of CO2 and H2O, the lower operating temperature of PCECs favors in-situ Fischer-Tropsch reactions [13], which are the rate-controlling reactions for co-electrolysis in solid oxide electrolyzer cells (SOEC) [14].The lower operating temperature further allows the use of less expensive interconnect and balance-of-plant (BoP) materials, resulting in lower manufacturing costs [15].Although protonic ceramic cell technology has shown great promise, most of the research and development efforts have focused only on the single cell level [1,2,4,7,[16][17][18][19]. Recently, researchers from South Korea demonstrated a scaled-up (5 × 5 cm 2 ) single protonic ceramic fuel cell that showed exciting high initial performance at intermediate temperatures [20].…”

“…Although protonic ceramic cell technology has shown great promise, most of the research and development efforts have focused only on the single cell level [1,2,4,7,[16][17][18][19]. Recently, researchers from South Korea demonstrated a scaled-up (5 × 5 cm 2 ) single protonic ceramic fuel cell that showed exciting high initial performance at intermediate temperatures [20].…”

Perspectives on Cathodes for Protonic Ceramic Fuel Cells

“…Similarly, an improvement in the performance of SrCo 0.9 Nb 0.1 O 3−δ is documented by the wet chemical method in comparison to solid-state reaction (0.348 W•cm −2 and 0.204 W•cm −2 , respectively, at 700 • C) [44]. Cobaltites have also achieved good performances as air electrodes in protonic ceramic electrolysis cells (PCECs), with a cell composed of an anode of Ba 0.5 La 0.5 CoO 3−δ and an electrolyte of Ba(Zr 0.5 Ce 0.4 ) 8/9 Y 0.2 O 3−δ , reaching a hydrogen evolution rate of 127 mol•cm −2 •min −1 at 0.5 A•cm −2 and 600 • C [45].…”

“…Cobaltites have also achieved good performances as air electrodes in protonic ceramic electrolysis cells (PCECs), with a cell composed of an anode of Ba0.5La0.5CoO3−δ and an electrolyte of Ba(Zr0.5Ce0.4)8/9Y0.2O3−δ, reaching a hydrogen evolution rate of 127 mol•cm −2 •min −1 at 0.5 A•cm −2 and 600 °C [45].…”

Effects of Sn Doping and A‐Site Deficiency on the Phases and Electrical Conductivities of the High‐Temperature Proton Conductor LaNbO4

“…The state-of-the-art high-temperature ceramic proton conductors are the perovskite structure oxides with Ba or Sr as the main component, [7][8][9][10] such as acceptor-doped barium cerate [9,[11][12][13] or zirconate. [7,14,15] The former shows the highest-reported proton conductivity but suffers from low chemical stability and decomposing when exposed to acidic gases such as carbon oxides, hydrogen sulphide, or even water vapor. BaZrO 3 has better stability but exhibits high grain boundary resistance and requires high sintering temperatures.…”