In Situ X-Ray Absorption Fine Structure Measurements of LaNi5 Electrodes in Alkaline Electrolytes

Donald A. Tryk, In Tae Bae, Yining Hu, Sunghyun Kim, Mark R. Antonio, Daniel Alberto Scherson

研究成果査読

24 被引用数 (Scopus)

抄録

In situ Ni K-edge and La Lm-edge x-ray absorption fine structure (XAFS) measurements of LaNi5 electrodes supported on hydrophobic carbon black-polytetrafluoroethylene (PTFE) layers were carried out in strongly alkaline electrolytes as a function of the state of charge. The Ni K-edge x-ray absorption near-edge structure (XANES) for the material in the discharged (and uncharged) and charged states were essentially identical to those reported earlier for crystalline LaNi5before and after exposure to gas-phase hydrogen, respectively. The Ni K-edge extended x-ray absorption fine structure (EXAFS) analysis of the most prominent shell yielded average Ni-Ni nearest neighbor distances of 2.52 ± 0.02 A for the charged compared to 2.47 ± 0.02 A for the discharged and uncharged electrodes. For the La Lm-edge XANES, the white line was found to be significantly more intense for the charged than for the uncharged LaNi5, an effect consistent with an increase in the density of empty d-like states just above the Fermi level on hydrogen injection.

本文言語English
ページ(範囲)824-828
ページ数5
ジャーナルJournal of the Electrochemical Society
142
3
DOI
出版ステータスPublished - 1995 1 1
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

フィンガープリント

「In Situ X-Ray Absorption Fine Structure Measurements of LaNi5 Electrodes in Alkaline Electrolytes」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル