Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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Improvement of the Catalytic Properties of Porous Nickel Hydrogen Electrodes for Alkaline Fuel Cell

알칼리형 연료전지용 다공성 니켈수소극의 촉매특성개선

  • Lee, Hong-Ki (Dept. of Industrial Chemistry, College of Eng., Hanyang University) ;
  • Lee, Ju-Seong (Dept. of Industrial Chemistry, College of Eng., Hanyang University)
  • 이홍기 (한양대학교 공과대학 공업화학과) ;
  • 이주성 (한양대학교 공과대학 공업화학과)
  • Received : 1991.10.25
  • Accepted : 1992.03.16
  • Published : 1992.06.30
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Abstract

Nickel was used as a catalyst for the hydrogen electrode in alkaline fuel cell. The optimum electrolyte concentration and recommendable operating temperature identified from polarization curves were 6N KOH and $80^{\circ}C$, respectively. Comparing the conductivity, apparent porosity and current density at porous hydrogen electrode manufactured with various PTFE additions, the proper content of PTFE was 10wt%. Chemisorption was carried out to define the appropriate surface area. The electrode produced with 10wt% of PTFE and sintered at $340^{\circ}C$ showed more than $200mA/cm^2$ of current density. The morphology of electrode surface was investigated with SEM. Cold pressing, hot pressing, rolling and calendering methods were carried out for manufacturing the electrode, and electrochemical characteristics for each method was studied.

알칼리형 연료전지의 수소극을 제작하기 위해 니켈을 사용하였다. 분극곡선을 측정한 결과 최적의 전해질 농도와 운전온도 조건은 6N KOH와 $80^{\circ}C$였다. 다양한 양의 PTFE 현탁액을 첨가하며 제조한 수소극에서의 전도도와 겉보기기공도 및 전류밀도를 비교한 결과 10wt%의 PTFE를 첨가하는 경우가 가장 적당함을 알았다. CO 화학흡착량으로부터 표면적을 구했으며 10wt%의 PTFE를 침적시키고 $340^{\circ}C$에서 소결시켜 제조한 수소극의 경우 $200mA/cm^2$ 이상의 전류밀도를 나타내었다. 전극의 표면구조를 SEM으로 관찰하였고 cold pressing, hot pressing, rolling 및 calendering 방법 등의 전극제작방법에 따른 전기화학적 특성을 고찰하였다.

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