Preparation and mixed proton-hole conductivity of barium zirconate doped with scandium and cobalt

Hiroki Uehara; Akihiro Ishii; Itaru Oikawa; Hitoshi Takamura

doi:10.1016/j.ijhydene.2021.11.186

Preparation and mixed proton-hole conductivity of barium zirconate doped with scandium and cobalt

Hiroki Uehara, Akihiro Ishii, Itaru Oikawa, Hitoshi Takamura

ENG - Materials Science

Research output: Contribution to journal › Article › peer-review

3 Citations (Scopus)

Abstract

A new mixed proton-hole conducting material is developed by doping the proton conductor, BaZr_1-xSc_xO_3-δ with cobalt, which is known for yielding high hole conductivity in oxides. The phases present, proton incorporation, and electrical conductivity of BaCo_xZr_0.9-xSc_0.1O_3-δ are investigated in this study. XRD analysis reveals that the doping of Sc, which has a larger ionic radius than Co and Zr, increases the cobalt solubility limit for BaZrO₃ from 0.13 to 0.2. It is found that the conductive protons are incorporated in the bulk portion of Co, Sc-doped BaZrO₃. The proton concentration of BaCo_xZr_0.9-xSc_0.1O_3-δ is shown to decrease as the Co content increases up to x = 0.1; however, at higher Co content (x = 0.15 and 0.2), the proton concentration increases again. In addition, it is found that the conductivity of BaCo_xZr_0.9-xSc_0.1O_3-δ is higher than that of Fe or Pr doped BaM_xZr_1-x-yY_yO_3-δ for the same dopant concentration. The maximum conductivity of the single phase samples in both the wet oxidizing (P_H₂O = 0.012 atm, P_O₂ = 0.21 atm) and dry oxidizing atmosphere (P_O₂ = 0.21 atm) is 0.1 S cm⁻¹ for BaCo₀_·₂Zr_0.7Sc_0.1O_3-δ.

Original language	English
Pages (from-to)	5577-5584
Number of pages	8
Journal	International Journal of Hydrogen Energy
Volume	47
Issue number	8
DOIs	https://doi.org/10.1016/j.ijhydene.2021.11.186
Publication status	Published - 2022 Jan 26

Keywords

BaZrO
Electrical property
Mixed proton-hole conductor
Proton conductivity
Proton incorporation

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Fuel Technology
Condensed Matter Physics
Energy Engineering and Power Technology

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.ijhydene.2021.11.186

Cite this

@article{b04014d380c8439f88b245b0119d8f7f,

title = "Preparation and mixed proton-hole conductivity of barium zirconate doped with scandium and cobalt",

abstract = "A new mixed proton-hole conducting material is developed by doping the proton conductor, BaZr1-xScxO3-δ with cobalt, which is known for yielding high hole conductivity in oxides. The phases present, proton incorporation, and electrical conductivity of BaCoxZr0.9-xSc0.1O3-δ are investigated in this study. XRD analysis reveals that the doping of Sc, which has a larger ionic radius than Co and Zr, increases the cobalt solubility limit for BaZrO3 from 0.13 to 0.2. It is found that the conductive protons are incorporated in the bulk portion of Co, Sc-doped BaZrO3. The proton concentration of BaCoxZr0.9-xSc0.1O3-δ is shown to decrease as the Co content increases up to x = 0.1; however, at higher Co content (x = 0.15 and 0.2), the proton concentration increases again. In addition, it is found that the conductivity of BaCoxZr0.9-xSc0.1O3-δ is higher than that of Fe or Pr doped BaMxZr1-x-yYyO3-δ for the same dopant concentration. The maximum conductivity of the single phase samples in both the wet oxidizing (PH2O = 0.012 atm, PO2 = 0.21 atm) and dry oxidizing atmosphere (PO2 = 0.21 atm) is 0.1 S cm−1 for BaCo0·2Zr0.7Sc0.1O3-δ.",

keywords = "BaZrO, Electrical property, Mixed proton-hole conductor, Proton conductivity, Proton incorporation",

author = "Hiroki Uehara and Akihiro Ishii and Itaru Oikawa and Hitoshi Takamura",

note = "Publisher Copyright: {\textcopyright} 2021 Hydrogen Energy Publications LLC",

year = "2022",

month = jan,

day = "26",

doi = "10.1016/j.ijhydene.2021.11.186",

language = "English",

volume = "47",

pages = "5577--5584",

journal = "International Journal of Hydrogen Energy",

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}

TY - JOUR

T1 - Preparation and mixed proton-hole conductivity of barium zirconate doped with scandium and cobalt

AU - Uehara, Hiroki

AU - Ishii, Akihiro

AU - Oikawa, Itaru

AU - Takamura, Hitoshi

PY - 2022/1/26

Y1 - 2022/1/26

N2 - A new mixed proton-hole conducting material is developed by doping the proton conductor, BaZr1-xScxO3-δ with cobalt, which is known for yielding high hole conductivity in oxides. The phases present, proton incorporation, and electrical conductivity of BaCoxZr0.9-xSc0.1O3-δ are investigated in this study. XRD analysis reveals that the doping of Sc, which has a larger ionic radius than Co and Zr, increases the cobalt solubility limit for BaZrO3 from 0.13 to 0.2. It is found that the conductive protons are incorporated in the bulk portion of Co, Sc-doped BaZrO3. The proton concentration of BaCoxZr0.9-xSc0.1O3-δ is shown to decrease as the Co content increases up to x = 0.1; however, at higher Co content (x = 0.15 and 0.2), the proton concentration increases again. In addition, it is found that the conductivity of BaCoxZr0.9-xSc0.1O3-δ is higher than that of Fe or Pr doped BaMxZr1-x-yYyO3-δ for the same dopant concentration. The maximum conductivity of the single phase samples in both the wet oxidizing (PH2O = 0.012 atm, PO2 = 0.21 atm) and dry oxidizing atmosphere (PO2 = 0.21 atm) is 0.1 S cm−1 for BaCo0·2Zr0.7Sc0.1O3-δ.

AB - A new mixed proton-hole conducting material is developed by doping the proton conductor, BaZr1-xScxO3-δ with cobalt, which is known for yielding high hole conductivity in oxides. The phases present, proton incorporation, and electrical conductivity of BaCoxZr0.9-xSc0.1O3-δ are investigated in this study. XRD analysis reveals that the doping of Sc, which has a larger ionic radius than Co and Zr, increases the cobalt solubility limit for BaZrO3 from 0.13 to 0.2. It is found that the conductive protons are incorporated in the bulk portion of Co, Sc-doped BaZrO3. The proton concentration of BaCoxZr0.9-xSc0.1O3-δ is shown to decrease as the Co content increases up to x = 0.1; however, at higher Co content (x = 0.15 and 0.2), the proton concentration increases again. In addition, it is found that the conductivity of BaCoxZr0.9-xSc0.1O3-δ is higher than that of Fe or Pr doped BaMxZr1-x-yYyO3-δ for the same dopant concentration. The maximum conductivity of the single phase samples in both the wet oxidizing (PH2O = 0.012 atm, PO2 = 0.21 atm) and dry oxidizing atmosphere (PO2 = 0.21 atm) is 0.1 S cm−1 for BaCo0·2Zr0.7Sc0.1O3-δ.

KW - BaZrO

KW - Electrical property

KW - Mixed proton-hole conductor

KW - Proton conductivity

KW - Proton incorporation

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U2 - 10.1016/j.ijhydene.2021.11.186

DO - 10.1016/j.ijhydene.2021.11.186

M3 - Article

AN - SCOPUS:85121664646

SN - 0360-3199

VL - 47

SP - 5577

EP - 5584

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 8

ER -

Preparation and mixed proton-hole conductivity of barium zirconate doped with scandium and cobalt

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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