Ⅰ. 신재생에너지 (New Renewable)
- 현재 전 세계는 화석에너지와 원자력에너지에 크게 의존하고 있다. 하지만 화석에너지의 고갈과 원자력 발전 시에 발생하는 사고와 후유증의 위험을 감지하고 재생에너지의 비율을 높이려 노력하고 있다. 고갈되어 가는 화석연료를 대체할 수 있는 다양한 신,재생 에너
rose, higher level of electricity application became possible to realize.
(ex) Uninterruptible(UPS), Hybrid automobile
supercapacitors have a lot in common with batteries, but we can say that they are the newest form of battery.
You can charge it in a very short period of time and repeat a number of charge and discharge periods.
The energy efficiency is much higher than a battery.
1.Introduction
A fuel cell is a device that converts the chemical energy of a fuel (hydrogen, natural gas, methanol, gasoline, etc.) and an oxidant (air or oxygen) into electricity. A fuel cell operates like a battery. However, a fuel cell does not require recharging, it produces electricity and heat as long as fuel and an oxidizer are supplied.
Fuel cell construction generally consists
Hybrid
The hybrid car has two power sources – an engine and a secondary cell. These sources work respectively or simultaneously according to the driving condition to increase efficiency. Hybrid cars run on battery power at low speeds and switch to traditional internal-combustion at higher speeds. Since the capability of a secondary battery is not enough to replace the existing engine, it
hybridization of the valence electrons of two carbon atoms lead to molecular π- and σ-bondings.
2. Electrons in π bond are less influenced by nuclear relatively.
The overlap of molecular orbitals (MO’s) in organic semiconductors
lead to a formation of bands with a width W.
When an electron breaks a covalent bond of an intrinsic crystal structure and more away, a vacancy is created