Korean Chemical Engineering Research

The Korean Institute of Chemical Engineers (한국화학공학회)
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Electrochemical Synthesis of Ammonia from Water and Nitrogen using a Pt/GDC/Pt Cell

Pt/GDC/Pt 셀을 이용한 물과 질소로부터 전기화학적 암모니아 합성

  • Jeoung, Hana (Department of Chemical and Biochemical Engineering, Konyang University) ;
  • Kim, Jong Nam (Department of Clean Fuel, Korea Institute of Energy Research) ;
  • Yoo, Chung-Yul (Department of Clean Fuel, Korea Institute of Energy Research) ;
  • Joo, Jong Hoon (Department of Clean Fuel, Korea Institute of Energy Research) ;
  • Yu, Ji Haeng (Department of Clean Fuel, Korea Institute of Energy Research) ;
  • Song, Ki Chang (Department of Chemical and Biochemical Engineering, Konyang University) ;
  • Sharma, Monika (Department of Clean Fuel, Korea Institute of Energy Research) ;
  • Yoon, Hyung Chul (Department of Clean Fuel, Korea Institute of Energy Research)
  • Received : 2013.09.13
  • Accepted : 2013.11.12
  • Published : 2014.02.01
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Abstract

Electrochemical ammonia synthesis from water and nitrogen using a Pt/GDC/Pt cell was experimentally investigated. Electrochemical analysis and ammonia synthesis in the moisture-saturated nitrogen environment were performed under the operating temperature range $400{\sim}600^{\circ}C$ and the applied potential range OCV (Open Circuit Voltage)-1.2V. Even though the ammonia synthesis rate was augmented with the increase in the operating temperature (i.e. increase in the applied current) under the constant potential, the faradaic efficiency was decreased because of the limitation of dissociative chemisorption of nitrogen on the Pt electrode. The maximum synthesis rate of ammonia was $3.67{\times}10^{-11}mols^{-1}cm^{-2}$ with 0.1% faradaic efficiency at $600^{\circ}C$.

본 연구에서는 Pt/GDC/Pt 셀을 이용하여 상압에서 물과 질소로부터 전기화학적으로 암모니아를 합성하는 연구를 수행하였다. 수분이 포화된 질소분위기에서 작동온도($400{\sim}600^{\circ}C$)와 전압(OCV(Open Circuit Voltage)~1.2 V)에 대한 전기화학적 특성 평가를 수행하였고, 암모니아 합성량을 정량 분석하였다. 정전압 하에서 작동온도의 증가에 따라 인가 전류의 증가로 암모니아 합성량은 증가하였으나, Pt 전극에서 암모니아 합성에 필요한 질소의 화학적 해리 흡착 반응의 한계로 패러데이 효율(faradaic efficiency)은 감소하였다. $600^{\circ}C$에서 최대 암모니아 합성량인 $3.67{\times}10^{-11}mols^{-1}cm^{-2}$(6.7 mA) 얻었고 패러데이 효율은 0.1%이다.

Keywords

References

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