Phosphor (Energy Converter)
Inorganic phosphor materials
“Classical” inorganic phosphors usually consist of a host lattice with activator ions doped into it in small concentrations, typically a few mole percent or less.
Host lattice & Activator ion
1st type : weak interaction (Ln3+)
2nd type: strong interaction ( Mn2+, Eu2+, Ce3+, Pb2+,Sb3+, Ce3+, MoO42-, NbO43-)
Activator (+ Sensit
2.4 Fuel cell application
2.4.1 수소연료전지 자동차
수소 연료 자동차의 경우 기본적인 메카니즘은 탱크로부터 저장된 수소를 변환기를 통하여 본래 수소의 형태로 만들어 주고 그 이후에 만들어진 수소를 연료전지 과정을 통해 전기를 만들게 된다.
수소연료자동차 작동원리 <그림4>
Advantage
Environmental Energy source.
Reduce greenhouse gases emission
Primary role as a improvement of future environment.
Disadvantage
Economical Problem
Storage problem , Transport problem
1.United States
Perform the research and development through
DOE(Department Of Energy)
Invest a lot of fund in Stack technology.
2.Japan
Hydro Fuel cell research and develop
High-temperature decomposition
High-temperature splitting of water occurs at about 3000 °C. At this temperature, 10% of the water is decomposed and the remaining 90% can be recycled. To reduce the temperature, other processes for high temperature splitting of water have been suggested:
▸Thermo-chemical cycles.
▸Hybrid systems coupling thermal decomposition and electrolytic