Comparison of Cu and Pt point-contact electrodes on proton conducting BaZr0.7Ce0.2Y0.1O3−

Abstract

PrefaceThis dissertation is submitted in partial fulfilment of the requirements for the degree of Philosophiae Doctor (PhD)

The Role of Space Charge at Metal/Oxide Interfaces in Proton Ceramic Electrochemical Cells

“…Our results suggest that the charge transfer resistance is not limited by diffusion across the space-charge layer at higher temperatures. This conclusion is in line with experiments where measurements on Pt and Cu electrodes indicate that the availability of atomic hydrogen and hydrogen oxidation, respectively, are the limiting steps for these electrodes …”

“…This conclusion is in line with experiments where measurements on Pt and Cu electrodes indicate that the availability of atomic hydrogen and hydrogen oxidation, respectively, are the limiting steps for these electrodes. 26 Besides enhancing the performance of the electrode, enrichment of OH O…”

Molybdenum‐ and vanadium‐containing perovskite electrocatalysts for dissociation of H 2 S

“…High proton conductivity and low activation energy are generally reported for yttrium‐doped barium zirconate, BaZr 0.8 Y 0.2 O 3− δ , and BaCe 0.7 Zr 0.1 Y 0.2 O 3− δ is often used as electrolyte in SOFCs. Another version of this proton‐conducting material is BaZr 0.7 Ce 0.2 Y 0.1 O 3 …”

“…Having high chemical and thermal stability, mixed oxides (perovskites) have been finding wider application in electrochemical reactors and solid oxide fuel cells (SOFCs) as electrolyte materials [8][9][10] as well as electrode materials. [11][12][13][14][15][16][17][18][19][20][21] High proton conductivity and low activation energy are generally reported for yttrium-doped barium zirconate, BaZr 0.8 Y 0.2 O 3−δ , 8 and BaCe 0.7 Zr 0.1 Y 0.2 O 3−δ is often used as electrolyte in SOFCs.…”

“…Another version of this proton-conducting material is BaZr 0.7 Ce 0.2 Y 0.1 O 3 . 9, 10 Various formulations have been employed with the aim of developing redox-stable efficient anodes: La 0.75 Sr 0. 25 [22][23][24][25][26][27][28] MoS 2 catalyst has been studied in thermal decomposition of H 2 S, and it was reported that 95% of H 2 S was converted into hydrogen and sulfur at the temperature of 1073 K. 22 In another study, various transition metal sulfides were tested in the decomposition of H 2 S, and among these catalysts, MoS 2 exhibited the highest conversion above 873 K. 23 Catalytic thermal decomposition of hydrogen sulfide has been studied using vanadium-containing catalysts by a few numbers of researchers.…”