Subject
fuel cell
10
kerosene
7
electric vehicle
5
hydrogen fuel
5
battery
4
electric device
4
electric power generation
4
energy system
4
fuel management
4
hydrogen
4
mobility
4
renewable energy
4
aircraft
3
transport
3
aviation fuel
2
biomass
2
biomass energy production
2
carbon dioxide
2
coupling
2
dehydration
2
desulfurization
2
drinking water
2
energy transport
2
hydrogen energy
2
processing
2
air transport
1
diesel
1
energy carrier
1
fuel
1
gas cleaning
1
gas storage
1
hydrogen carrier
1
hydrogen production
1
hydrogen storage
1
hydrogen transport
1
power supply
1
reformer
1
safety engineering
1
safety regulation
1
sol gel process
1
traffic
1