Operando XAFS study of carbon supported Ni, NiZn, and Co catalysts for hydrazine electrooxidation for use in anion exchange membrane fuel cells

Tomokazu Sakamoto; Daiju Matsumura; Koichiro Asazawa; Ulises Martinez; Alexey Serov; Kateryna Artyushkova; Plamen Atanassov; Kazuhisa Tamura; Yasuo Nishihata; Hirohisa Tanaka

doi:10.1016/j.electacta.2015.02.156

Operando XAFS study of carbon supported Ni, NiZn, and Co catalysts for hydrazine electrooxidation for use in anion exchange membrane fuel cells

Tomokazu Sakamoto
, Daiju Matsumura
, Koichiro Asazawa
, Ulises Martinez
, Alexey Serov
, Kateryna Artyushkova
, Plamen Atanassov
, Kazuhisa Tamura
, Yasuo Nishihata
, Hirohisa Tanaka

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

66 Scopus citations

Abstract

Carbon supported Ni, Ni_0.87Zn_0.13, and Co hydrazine electrooxidation catalysts were synthesized by an impregnation/freeze-drying procedure followed by thermal annealing for use as anode catalyst of direct hydrazine hydrate fuel cells (DHFCs). The cell performance of DHFCs changed significantly when different catalysts were used as anode. Ammonia generation from anode outlet at open circuit voltage (OCV) condition was higher for Co/C than for Ni-based catalysts. To better understand the cause of different performance and selectivity of each anode catalyst, extensive ex-situ and operando characterization was carried out. Operando XAFS measurement of Ni-K and Co-K edge shows the potential dependence of atomic structure of Ni/C, Ni_0.87Zn_0.13/C, and Co/C during hydrazine electrooxidation reaction.

Original language	English
Pages (from-to)	116-122
Number of pages	7
Journal	Electrochimica Acta
Volume	163
DOIs	https://doi.org/10.1016/j.electacta.2015.02.156
State	Published - May 1 2015
Externally published	Yes

Keywords

Anion exchange membrane fuel cells
Hydrazine electrooxidation catalyst
Operando
XAFS

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10.1016/j.electacta.2015.02.156

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Sakamoto, T., Matsumura, D., Asazawa, K., Martinez, U., Serov, A., Artyushkova, K., Atanassov, P., Tamura, K., Nishihata, Y., & Tanaka, H. (2015). Operando XAFS study of carbon supported Ni, NiZn, and Co catalysts for hydrazine electrooxidation for use in anion exchange membrane fuel cells. Electrochimica Acta, 163, 116-122. https://doi.org/10.1016/j.electacta.2015.02.156

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title = "Operando XAFS study of carbon supported Ni, NiZn, and Co catalysts for hydrazine electrooxidation for use in anion exchange membrane fuel cells",

abstract = "Carbon supported Ni, Ni0.87Zn0.13, and Co hydrazine electrooxidation catalysts were synthesized by an impregnation/freeze-drying procedure followed by thermal annealing for use as anode catalyst of direct hydrazine hydrate fuel cells (DHFCs). The cell performance of DHFCs changed significantly when different catalysts were used as anode. Ammonia generation from anode outlet at open circuit voltage (OCV) condition was higher for Co/C than for Ni-based catalysts. To better understand the cause of different performance and selectivity of each anode catalyst, extensive ex-situ and operando characterization was carried out. Operando XAFS measurement of Ni-K and Co-K edge shows the potential dependence of atomic structure of Ni/C, Ni0.87Zn0.13/C, and Co/C during hydrazine electrooxidation reaction.",

keywords = "Anion exchange membrane fuel cells, Hydrazine electrooxidation catalyst, Operando, XAFS",

author = "Tomokazu Sakamoto and Daiju Matsumura and Koichiro Asazawa and Ulises Martinez and Alexey Serov and Kateryna Artyushkova and Plamen Atanassov and Kazuhisa Tamura and Yasuo Nishihata and Hirohisa Tanaka",

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doi = "10.1016/j.electacta.2015.02.156",

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Sakamoto, T, Matsumura, D, Asazawa, K, Martinez, U, Serov, A, Artyushkova, K, Atanassov, P, Tamura, K, Nishihata, Y & Tanaka, H 2015, 'Operando XAFS study of carbon supported Ni, NiZn, and Co catalysts for hydrazine electrooxidation for use in anion exchange membrane fuel cells', Electrochimica Acta, vol. 163, pp. 116-122. https://doi.org/10.1016/j.electacta.2015.02.156

TY - JOUR

T1 - Operando XAFS study of carbon supported Ni, NiZn, and Co catalysts for hydrazine electrooxidation for use in anion exchange membrane fuel cells

AU - Sakamoto, Tomokazu

AU - Matsumura, Daiju

AU - Asazawa, Koichiro

AU - Martinez, Ulises

AU - Serov, Alexey

AU - Artyushkova, Kateryna

AU - Atanassov, Plamen

AU - Tamura, Kazuhisa

AU - Nishihata, Yasuo

AU - Tanaka, Hirohisa

PY - 2015/5/1

Y1 - 2015/5/1

N2 - Carbon supported Ni, Ni0.87Zn0.13, and Co hydrazine electrooxidation catalysts were synthesized by an impregnation/freeze-drying procedure followed by thermal annealing for use as anode catalyst of direct hydrazine hydrate fuel cells (DHFCs). The cell performance of DHFCs changed significantly when different catalysts were used as anode. Ammonia generation from anode outlet at open circuit voltage (OCV) condition was higher for Co/C than for Ni-based catalysts. To better understand the cause of different performance and selectivity of each anode catalyst, extensive ex-situ and operando characterization was carried out. Operando XAFS measurement of Ni-K and Co-K edge shows the potential dependence of atomic structure of Ni/C, Ni0.87Zn0.13/C, and Co/C during hydrazine electrooxidation reaction.

AB - Carbon supported Ni, Ni0.87Zn0.13, and Co hydrazine electrooxidation catalysts were synthesized by an impregnation/freeze-drying procedure followed by thermal annealing for use as anode catalyst of direct hydrazine hydrate fuel cells (DHFCs). The cell performance of DHFCs changed significantly when different catalysts were used as anode. Ammonia generation from anode outlet at open circuit voltage (OCV) condition was higher for Co/C than for Ni-based catalysts. To better understand the cause of different performance and selectivity of each anode catalyst, extensive ex-situ and operando characterization was carried out. Operando XAFS measurement of Ni-K and Co-K edge shows the potential dependence of atomic structure of Ni/C, Ni0.87Zn0.13/C, and Co/C during hydrazine electrooxidation reaction.

KW - Anion exchange membrane fuel cells

KW - Hydrazine electrooxidation catalyst

KW - Operando

KW - XAFS

UR - https://www.scopus.com/pages/publications/84923351033

U2 - 10.1016/j.electacta.2015.02.156

DO - 10.1016/j.electacta.2015.02.156

M3 - Article

AN - SCOPUS:84923351033

SN - 0013-4686

VL - 163

SP - 116

EP - 122

JO - Electrochimica Acta

JF - Electrochimica Acta

ER -

Operando XAFS study of carbon supported Ni, NiZn, and Co catalysts for hydrazine electrooxidation for use in anion exchange membrane fuel cells

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Keywords

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