Ammonia synthesis at intermediate temperatures in solid-state electrochemical cells using cesium hydrogen phosphate based electrolytes and noble metal catalysts

Shota Kishira, Geletu Qing, Shuya Suzu, Ryuji Kikuchi, Atsushi Takagaki, Shigeo Ted Oyama

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

This work reports the electrochemical synthesis of ammonia in solid-state cells at 220 °C and atmospheric pressure. Composites of CsH2PO4 and SiP2O7 were used as the electrolyte, and Pt/C-loaded carbon paper was employed as the anode. Five kinds of electrode materials, including Pt/C-, Pt-Ru/C-, Ru/C-, Ru- and Ag-Pd-loaded carbon paper, were examined as the cathode. Electrochemical activities of the cathode materials were evaluated by cyclic voltammetry. Both H2 and steam were used as the hydrogen source. The successful synthesis of ammonia was confirmed using Nessler's solution. When H2 was used as the hydrogen source, ammonia formation rates higher than 10−10 mol cm−2 s−1 were obtained using Pt/C- or Ru-loaded carbon paper as the cathode. When steam was used as the hydrogen source, ammonia formation rates higher than 10−11 mol cm−2 s−1 were obtained using Pt-Ru/C- or Ru/C- or Ru-loaded carbon paper as the cathode. Ru and Ag-Pd were the most promising noble metal catalysts for electrochemical synthesis of ammonia from N2 and steam.

Original languageEnglish
Pages (from-to)26843-26854
Number of pages12
JournalInternational Journal of Hydrogen Energy
Volume42
Issue number43
DOIs
Publication statusPublished - Oct 26 2017
Externally publishedYes

Fingerprint

Electrochemical cells
electrochemical cells
Cesium
Precious metals
noble metals
cesium
ammonia
Ammonia
phosphates
Phosphates
Electrolytes
electrolytes
solid state
catalysts
Cathodes
Hydrogen
Catalysts
cathodes
steam
hydrogen

All Science Journal Classification (ASJC) codes

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

Cite this

Ammonia synthesis at intermediate temperatures in solid-state electrochemical cells using cesium hydrogen phosphate based electrolytes and noble metal catalysts. / Kishira, Shota; Qing, Geletu; Suzu, Shuya; Kikuchi, Ryuji; Takagaki, Atsushi; Oyama, Shigeo Ted.

In: International Journal of Hydrogen Energy, Vol. 42, No. 43, 26.10.2017, p. 26843-26854.

Research output: Contribution to journalArticle

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