Electrical Properties of Hollandite-Type
Ba1.33Ga2.67Ti5.33O16, K1.33Ga1.33Ti6.67O16, and K1.54Mg0.77Ti7.23O16

Can Cao; Kalpana Singh; Wang Hay Kan; Maxim Avdeev; Venkataraman Thangadurai

doi:10.1021/acs.inorgchem.8b03152

Electrical Properties of Hollandite-Type Ba1.33Ga2.67Ti5.33O16, K1.33Ga1.33Ti6.67O16, and K1.54Mg0.77Ti7.23O16

Can Cao, Kalpana Singh, Wang Hay Kan, Maxim Avdeev, Venkataraman Thangadurai^*

^*Corresponding author for this work

School of Chemistry

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

8 Citations (Scopus)

Abstract

Electrical conductivity and electrochemical catalytic activity for H ₂ oxidation of Ti-based hollandite-type Ba _1.33 Ga _2.67 Ti _5.33 O ₁₆ (BGT), K _1.33 Ga _1.33 Ti _6.67 O ₁₆ (KGT), and K _1.54 Mg _0.77 Ti _7.23 O ₁₆ (KMT) were investigated, along with the chemical stability of KMT under H ₂ at elevated temperature. BGT, KGT, and KMT crystallized in a tetragonal structure with the space-group I4/m. The electrical conductivity in H ₂ increases with increasing Ti content, and the highest total electrical conductivity of 2 S/cm at 800 °C in H ₂ was observed for KMT. KGT:Fe (1:1) + 20% LSGM + 30% porosity composite electrode showed the lowest area specific resistance of ca. 1.6 Ω cm ² at 800 °C for hydrogen oxidation reaction (HOR) under the open circuit condition. Moderate catalytic activity for HOR could be attributed to poor oxide ion conductivity and exclusion of potassium and hydrogen uptake in H ₂ at elevated temperature. Bond valence sum mismatch map calculation showed that the ionic transport happens along the 1D channel of c-axis in the hollandite oxides.

Original language	English
Pages (from-to)	4782-4791
Number of pages	10
Journal	Inorganic Chemistry
Volume	58
Issue number	8
DOIs	https://doi.org/10.1021/acs.inorgchem.8b03152
Publication status	Published - 15 Apr 2019

Access to Document

10.1021/acs.inorgchem.8b03152

Cite this

@article{6a037de4b4cc4fd186d0075a0881375a,

title = "Electrical Properties of Hollandite-Type Ba1.33Ga2.67Ti5.33O16, K1.33Ga1.33Ti6.67O16, and K1.54Mg0.77Ti7.23O16",

abstract = " Electrical conductivity and electrochemical catalytic activity for H 2 oxidation of Ti-based hollandite-type Ba 1.33 Ga 2.67 Ti 5.33 O 16 (BGT), K 1.33 Ga 1.33 Ti 6.67 O 16 (KGT), and K 1.54 Mg 0.77 Ti 7.23 O 16 (KMT) were investigated, along with the chemical stability of KMT under H 2 at elevated temperature. BGT, KGT, and KMT crystallized in a tetragonal structure with the space-group I4/m. The electrical conductivity in H 2 increases with increasing Ti content, and the highest total electrical conductivity of 2 S/cm at 800 °C in H 2 was observed for KMT. KGT:Fe (1:1) + 20% LSGM + 30% porosity composite electrode showed the lowest area specific resistance of ca. 1.6 Ω cm 2 at 800 °C for hydrogen oxidation reaction (HOR) under the open circuit condition. Moderate catalytic activity for HOR could be attributed to poor oxide ion conductivity and exclusion of potassium and hydrogen uptake in H 2 at elevated temperature. Bond valence sum mismatch map calculation showed that the ionic transport happens along the 1D channel of c-axis in the hollandite oxides.",

author = "Can Cao and Kalpana Singh and Kan, {Wang Hay} and Maxim Avdeev and Venkataraman Thangadurai",

note = "Publisher Copyright: Copyright {\textcopyright} 2019 American Chemical Society.",

year = "2019",

month = apr,

day = "15",

doi = "10.1021/acs.inorgchem.8b03152",

language = "English",

volume = "58",

pages = "4782--4791",

journal = "Inorganic Chemistry",

issn = "0020-1669",

publisher = "American Chemical Society (ACS)",

number = "8",

}

TY - JOUR

T1 - Electrical Properties of Hollandite-Type Ba1.33Ga2.67Ti5.33O16, K1.33Ga1.33Ti6.67O16, and K1.54Mg0.77Ti7.23O16

AU - Cao, Can

AU - Singh, Kalpana

AU - Kan, Wang Hay

AU - Avdeev, Maxim

AU - Thangadurai, Venkataraman

PY - 2019/4/15

Y1 - 2019/4/15

N2 - Electrical conductivity and electrochemical catalytic activity for H 2 oxidation of Ti-based hollandite-type Ba 1.33 Ga 2.67 Ti 5.33 O 16 (BGT), K 1.33 Ga 1.33 Ti 6.67 O 16 (KGT), and K 1.54 Mg 0.77 Ti 7.23 O 16 (KMT) were investigated, along with the chemical stability of KMT under H 2 at elevated temperature. BGT, KGT, and KMT crystallized in a tetragonal structure with the space-group I4/m. The electrical conductivity in H 2 increases with increasing Ti content, and the highest total electrical conductivity of 2 S/cm at 800 °C in H 2 was observed for KMT. KGT:Fe (1:1) + 20% LSGM + 30% porosity composite electrode showed the lowest area specific resistance of ca. 1.6 Ω cm 2 at 800 °C for hydrogen oxidation reaction (HOR) under the open circuit condition. Moderate catalytic activity for HOR could be attributed to poor oxide ion conductivity and exclusion of potassium and hydrogen uptake in H 2 at elevated temperature. Bond valence sum mismatch map calculation showed that the ionic transport happens along the 1D channel of c-axis in the hollandite oxides.

AB - Electrical conductivity and electrochemical catalytic activity for H 2 oxidation of Ti-based hollandite-type Ba 1.33 Ga 2.67 Ti 5.33 O 16 (BGT), K 1.33 Ga 1.33 Ti 6.67 O 16 (KGT), and K 1.54 Mg 0.77 Ti 7.23 O 16 (KMT) were investigated, along with the chemical stability of KMT under H 2 at elevated temperature. BGT, KGT, and KMT crystallized in a tetragonal structure with the space-group I4/m. The electrical conductivity in H 2 increases with increasing Ti content, and the highest total electrical conductivity of 2 S/cm at 800 °C in H 2 was observed for KMT. KGT:Fe (1:1) + 20% LSGM + 30% porosity composite electrode showed the lowest area specific resistance of ca. 1.6 Ω cm 2 at 800 °C for hydrogen oxidation reaction (HOR) under the open circuit condition. Moderate catalytic activity for HOR could be attributed to poor oxide ion conductivity and exclusion of potassium and hydrogen uptake in H 2 at elevated temperature. Bond valence sum mismatch map calculation showed that the ionic transport happens along the 1D channel of c-axis in the hollandite oxides.

UR - http://www.scopus.com/inward/record.url?scp=85064113850&partnerID=8YFLogxK

U2 - 10.1021/acs.inorgchem.8b03152

DO - 10.1021/acs.inorgchem.8b03152

M3 - Article

C2 - 30920817

AN - SCOPUS:85064113850

SN - 0020-1669

VL - 58

SP - 4782

EP - 4791

JO - Inorganic Chemistry

JF - Inorganic Chemistry

IS - 8

ER -

Electrical Properties of Hollandite-Type Ba1.33Ga2.67Ti5.33O16, K1.33Ga1.33Ti6.67O16, and K1.54Mg0.77Ti7.23O16

Abstract

Access to Document

Other files and links

Fingerprint

Cite this