Systematic investigation of anode catalysts for liquid ammonia electrolysis

Natsuho Akagi, Keisuke Hori, Hisashi Sugime, Suguru Noda, Nobuko Hanada*

*この研究の対応する著者

研究成果: Article査読

抄録

Liquid ammonia is able to release hydrogen via electrolysis with a theoretical voltage of 0.077 V. However, the actual operation voltage is much higher (around 1–2 V) due to the large overpotential of the anodic reaction. We systematically investigated Pt, Ir, Ru, Ni, Co, Fe, Ta, and Ti as the anodic catalyst, and observed a volcano correlation when plotting the current density against the formation enthalpy of metal nitrides per nitrogen ΔfHMN (kJ/mol-N). ΔfHMN reflects the strength of metal-nitrogen bond, and Ru having a moderate ΔfHMN showed the highest catalytic activity. Then, the activity enhancement via microstructure control was examined. The sputtered Pt and Ni films having a columnar structure with a rough surface showed 7- and 13-times higher current density than the Pt and Ni plates, respectively. An anodic current density of 0.45 mA/cm2 was achieved for the sputtered Ni film at an anodic potential as low as 0.3 V vs H2/NH3.

本文言語English
ページ(範囲)222-230
ページ数9
ジャーナルJournal of Catalysis
406
DOI
出版ステータスPublished - 2022 2月

ASJC Scopus subject areas

  • 触媒
  • 物理化学および理論化学

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