Discharge electricity?
->No need to charge
Low temperature operation?
-> Min. 600 ℃
Only H2 for fuel?
-> Carbohydrates
Stable at high T and oxidation-reduction condition
High ionic conductivity
Low electronic conductivity
Perovskite or Flourite structure
Chemical stability at reduction environment
There is no change of state between normal T and operating T
temperatures in low CO2 gas atmospheres, and in strongly basic melts
Cathode :
An acceptable material for cathode must have adequate electrical conductivity, structural strength, and low dissolution rate to avoid precipitation of metal
Electrolyte :
lithium potassium carbonate
lithium sodium carbonate
Advantage :
no expensive electro-catalyst
CO can be fuel
w
"Siemens 전기 주식회사 설립
1981 Siemens 첫 64-kbit 메모리칩 생산
1988 1-megabit DRAM 칩 대량생산 개시
1994 1.8KW high-temperature fuel cell로 세계 신기록 수립
1955 256Megabit 칩 첫 샘플
1998 지문인식 센서 개발
2001 Siemens, 뉴욕 주식 상장
2002 중국 상하이, 자기부상열차 시운전 개시
2003 Cellular phone으로 영화 다운로드
(MRI) "Magnetom" 소개
1988 1-megabit DRAM 칩 대량생산 개시
1993 모듈 방식으로 설계된 기관차 "Eurosprinter"개발
1994 1.8KW high-temperature fuel cell로 세계 신기록 수립
1955 256Megabit 칩 첫 샘플
1997 Siemens 창립 150주년 - 한국 Siemens 가족의 날 행사
1998 지문인식 센서 개발
2001 Siemens, 뉴욕 주식 상장
We can’t live without energy and most of that energy comes from fossil fuels like petroleum, coal, and natural gas. It is well known that human activities, such as burning fossil fuels, cause global warming, increasing the overall temperatures of the earth. Other than environmental concerns, fossil fuels are becoming more expensive and will eventually run out. So, we need to find ‘alternative
fuel(hydrogen, methanol, natural gas etc.) into electric energy
The reaction of hydrogen and oxygen generates electricity. It is a reversed reaction that generates hydrogen and oxygen by doing water electrolysis
(중략)
Polyelectrolyte fuel cell
Using a membrane with a proton conduction as an electrolyte
Operating temperature is about 80℃
A power source of an electromobile, diversi
HCCI is Homogeneous Charge Compression Ignition
HCCI engine concept combines aspects of SI and Diesel engines by compression igniting a pre-mixture of fuel and air.
No flame propagation or mixing controlled combustion – global auto-ignition of the charge .
Can use uniformly ultra-lean mixtures, giving low peak combustion temperatures, near zero NOx emissions.
Auto-ignition i
fuel has gradually increased, and because biomass acts as reducing greenhouse effect mortar material like CO2. Extracting from biomass to energy source by thermal treatment can be classified into three groups: gasification, combustion and pyrolysis. In this study, we applied fast pyrolysis technique, one of pyrolysis methods, to convert woody biomass under various reaction temperatures. As produc
temperature has increased by about 0.8 °°C(1.4°°F), with about two-thirds of the increase occurring since 1980. Warming of the climate system is unequivocal, and scientists are more than 90% certain that it is primarily caused by increasing concentrations of greenhouse gases produced by human activities such as the burning of fossil fuels and deforestation. These findings are recognized by th
fuels and pour polluting chemical waste into the air. This makes the air much less healthy to breathe. The air-borne pollution also falls back to the earth in the form of acid rain, which destroys plant life and human buildings.
Another serious long-term effect of air pollution is global warming. For the past several decades scientists have noted a disturbing rise in the average temperature of th