2017年
NiO/Nb2O5/C Hydrazine Electrooxidation Catalysts for Anion Exchange Membrane Fuel Cells
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
- 巻
- 164
- 号
- 4
- 開始ページ
- F229
- 終了ページ
- F234
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1149/2.0281704jes
- 出版者・発行元
- ELECTROCHEMICAL SOC INC
NiO/Nb2O5/C (8:1), (4:1), (2:1), NiO/C, and Ni/C catalysts for hydrazine electrooxidation were synthesized by an evaporation drying method followed by thermal annealing. Prepared catalysts were characterized by X-ray diffraction (XRD), high-angle annular dark field scanning transmission electron microscopy (HAADF-STEM), energy dispersive X-ray spectrometry (EDS), and X-ray absorption fine structure (XAFS). Catalytic activity, durability, and selectivity in the reaction of hydrazine electrooxidation were evaluated in alkalinemedia. The highest catalytic activity in mentioned above reactionwas found forNi/C, followed by:NiO/Nb2O5/C (8:1), NiO/Nb2O5/C (4:1). NiO/Nb2O5/C (2:1) whiles NiO/C has almost no activity for hydrazine oxidation. NiO/Nb2O5/C (8:1) and (4:1) had a highest stability during electrooxidation of hydrazine at 60 degrees C. It was explained by oxygen defect of NiO in NiO/Nb2O5/C from XAFS analysis. The selectivity hydrazine electrooxidation as measured by ammonia production resulted in observation that metallic Ni surface facilitates N-N bond breaking of hydrazine, which was confirmed by density functional theory (DFT) calculations. (C) The Author(s) 2017. Published by ECS. All rights reserved.
- リンク情報
- ID情報
-
- DOI : 10.1149/2.0281704jes
- ISSN : 0013-4651
- eISSN : 1945-7111
- Web of Science ID : WOS:000400958600128