Abstract:
PURPOSE: Ceria composition is provided to enable low temperature sintering of ceria electrolyte for high temperature sensor or solid oxide fuel cell by adding lithium salt with a low melting point and/or volatility into a material in a ceria system or additionally adding bismuth oxide. CONSTITUTION: A ceria composition is composed of ceria or metal doped ceria, and lithium salt. The lithium salt occupies more than 0 weight% but less than 50 weight% among the ceria composition. The lithium salt is lithium carbonate, lithium hydroxide, or lithium nitride. The ceria composition additionally contains bismuth oxide. A sintering body is a sintering body of the ceria composition which comprises ceria or metal doped ceria, lithium carbonate, and bismuth oxide. The ceria composition contains lithium carbonate with more than 0 weight% but more or less than 5 weight% and bismuth oxide with more than 0 weight% but less than 10 weight% in the sintering body. A ceria complex electrolyte powder is a calcined body of the ceria composition. The ceria composition is composed of ceria or metal doped ceria, and lithium salt and the lithium salt occupies more than 0 weight% but less than 50 weight% in the calcined body.
Abstract:
PURPOSE: A measuring method of the acid resistance of a separator for a polymer electrolyte fuel cell is provided to quantitatively and qualitatively measure acid resistance without direct application to a unit cell. CONSTITUTION: A measuring method of acid resistance of a separator for a polymer electrolyte fuel comprises: a step of dipping a material for the fuel cell separator in an acid solution, and filtering the same; a step of using the acid solution as a base solution to measure the absorbance of a filtering solution; and a step of quantitively analyzing the acid resistance thereof by calculating the erupted amount of a resin from the material for the fuel cell separator. The measurement step of the absorbance measures UV-Vis spectrums. The acids solution is a phosphate solution.
Abstract:
PURPOSE: An in-situ method of evaluating the degradation of a membrane-electrolyte assembly is provided to detect the cell deterioration state of a fuel cell in real time and to remarkably reduce the sensing and analyzing time. CONSTITUTION: An in-situ method of evaluating the degradation of a membrane-electrolyte assembly comprises a current supply apparatus constantly supplying current by being connected to two coupling plates of a fuel cell stack; a voltage measuring apparatus measuring a voltage between two separators selected from (n+1) separators in the fuel cell stack; and a physical property determining apparatus determining a constant current, the capacity of an electric double layer, roughness factor, and electrochemical active surface area from the current value of the current supply apparatus and the voltage between the separators. [Reference numerals] (AA) Stack real-time measuring device; (BB) Current generator; (CC) Membrane electrode assembly; (DD) Separator
Abstract:
PURPOSE: A manufacturing method of a core-shell structure electrocatalyst is provided to selectively form a shell layer on a shell layer without chemical and thermal treatments. CONSTITUTION: A manufacturing method of a core-shell structure electrocatalyst comprises a step of reacting a support and one or more precursors of a core-forming metal in an ether solvent. A manufacturing method of a core-shell structure electrode catalyst comprises a step of reacting the support and precursors in the ether solvent to obtain a core-shell-supported support; a step of reducing the precursors using an ester-based reducing agent in a solution in which the core-nanoparticles are supported or dispersed.
Abstract:
PURPOSE: An air electrode for molten carbonate fuel cell is provided to improve performance of a fuel cell while stably operating cells for long term by reducing polarization resistance of an air electrode through a quick oxygen-reduction reaction rate. CONSTITUTION: An air electrode for molten carbonate fuel cell comprises a porous nickel base electrode, and a metal particle coating the electrode. At least a part of the metal particle is attached to the surface of the nickel particle. The metal particle is one or more selected from a group consisting of silver, gold, copper, platinum, and cobalt. A manufacturing method of the air electrode comprises: a step of preparing coating liquid by dispersing the metal particle into a solvent; and a step of spreading the metal particle-coated liquid on the surface of the porous nickel base electrode.
Abstract:
담체에 담지된 촉매와 폴리벤지이미다졸의 제 1 혼합물을 제공하는 단계; 및 상기 혼합물에 폴리테트라플루오르에틸렌을 혼합하여 제 2 혼합물을 제조하는 단계;를 포함하는 폴리벤지이미다졸이 함유된 전극 제조 방법이 제공된다. 담체에 담지된 촉매 및 폴리벤지이미다졸을 먼저 혼합하여 혼합물을 제조한 것에 폴리테트라플루오르에틸렌을 혼합하여 전극을 제조함으로써, 삼상 계면의 활성을 높이고, 향상된 성능을 가지는 막전극접합체를 제조할 수 있다.
Abstract:
본 발명에서는, 저온 전사법을 이용한 연료전지 막전극접합체의 제조 방법으로서, 탄소층이 형성된 전사 기판을 제공하는 제 1 단계; 및 상기 탄소층이 형성된 전사 기판에 촉매 슬러리를 도포하여 촉매층을 형성하는 제 2 단계; 상기 전사 기판에 형성된 탄소층 및 촉매층을 고분자 전해질막에 전사하는 제 3 단계; 를 포함하는 막전극접합체 제조방법, 이에 따라 제조된 막전극접합체 및 이를 이용한 연료전지가 제공된다. 본 발명의 저온 전사 방법에 의하면 경제적이고 대량생산이 용이하며 동시에 높은 성능을 구현할 수 있는 막전극접합체 및 연료전지를 제조할 수 있다. 연료전지, 막전극접합체, 고온전사, 저온전사, 탄소층
Abstract:
연료전지 전극층에서의 패러데이 반응을 없애고 연료전지의 전위 중 전기이중층 반응만을 보이는 전위 조건에서 연료전지의 교류 임피던스와 나아가, 촉매/이오노머 계면 커패시턴스, 이오노머 네트워크의 이온 저항 등 전기화학적 특성을 용이하게 검출할 수 있다. 연료전지, 전극, 이온전도도, 이온저항, 교류임피던스, 복소 커패시턴스
Abstract:
PURPOSE: A Pd-Y alloy catalyst is provided to have improved activity and stability in oxygen reduction reaction more than a platinum catalyst, and to have lower cost than a platinum catalyst. CONSTITUTION: A manufacturing method of a Pd-Y alloy catalyst comprises a step of alloying palladium and yttrium. The alloying method is co-sputter alloying, colloidal alloying, impregnation alloying or electroplating alloying. A fuel cell comprises the Pd-Y alloy catalyst in fuel cell electrode.
Abstract:
본 발명은 촉매; 변성 알콕시레이트 화합물을 유효성분으로 포함하는 분산제; 전도성 이오노머; 및 용매를 포함하는 연료전지용 막-전극 접합체(MEA)의 제조를 위한 촉매 슬러리 조성물, 이를 사용한 연료전지용 막-전극 접합체의 제조방법 및 이로부터 제조된 연료전지용 막-전극 접합체에 관한 것이다. 촉매 슬러리 조성물에 포함된 촉매 및 전도성 이오노머 입자의 분산성을 향상시킬 수 있고, 이러한 촉매 슬러리 조성물을 도포하는 코팅공정과 용매를 제거하는 건조공정을 거친 후에 경우 균일성이 매우 우수하고 촉매와 이오노머 입자 사이가 연속적으로 이어지지 않아, 데드 스페이스(dead space)라 불리는 큰 크랙이 없는 구조 배열을 가진 촉매층을 형성할 수 있고, 궁극적으로 기공구조를 적용한 막-전극 접합체의 경우 향상된 성능을 나타낼 수 있다.