I have always thought that fuel such as petrol, diesel, etc.. are getting burnt to move the pistons in the car (I am not bringing physics). Why not hydrogen be used as a fuel but I know the incident about the Hindenburg disaster but the same thing could happen if the Hindenburg was filled with petrol. So both are combustible and that's what we want. Petrol and hydrogen do the same job what does he want?. When hydrogen is burnt there won't be any smoke so it saves the environment. PS: This is just to make this question a bit understandable I have mentioned the word "Alone" in the question.
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Hydrogen-powered cars exist. The energy density of petrol is higher than hydrogen and hydrogen is more difficult to store safely which why we use petrol and diesel. – Waylander Jul 11 '17 at 14:01
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Hydrogen-powered cars exist?? I never knew about that @Waylander. – kartlad Jul 11 '17 at 14:03
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But @Waylander Hydrogen is abandoned around the world! – kartlad Jul 11 '17 at 14:04
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Hydrogen alone can't be used as a fuel, you need an oxidizer like Oxygen, or Nitrous Oxide. But, of course, you might've assumed it, and not mentioned in the question. – Pritt says Reinstate Monica Jul 11 '17 at 14:07
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I will of course assumed it but anyways thanks @PrittBalagopal – kartlad Jul 11 '17 at 14:08
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Hydrogen isn't abandoned, it's still used a little, but it's very hard to store and carry around. Sometimes, the very fact that it's a ridiculously great fuel makes it hard to use, quite ironic. – Pritt says Reinstate Monica Jul 11 '17 at 14:09
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But @PrittBalagopal why can't we store Hydrogen as CNG? – kartlad Jul 11 '17 at 14:10
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By the way, do check out: Hydrogen as a fuel really worth it? The answers claim that hydrogen is hard to store in vessels as it's hard to leak. – Pritt says Reinstate Monica Jul 11 '17 at 14:10
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Another advantage over petrol is that with hydrogen, the world probably won't have to prop up oil states anymore. – iammax Jul 11 '17 at 14:13
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Hydrogen fits the definition of a fuel perfectly. Of course it can be used alone. Whether or not it's practical or better is the issue. – Zhe Jul 11 '17 at 14:27
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@PrittBalagopal Your comment with "alone" only confused OP; fuel and oxidiser are different things, and are treated separately. – Mithoron Jul 11 '17 at 15:45
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@Mithoron Probably, thanks for setting things straight now. – Pritt says Reinstate Monica Jul 11 '17 at 15:50
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Hydrogen fuel cells which produce electricity from hydrogen and oxygen are over a hundred years old https://www.thoughto.com/hydrogen-fuel-cells1991799
The recently introduced Toyota Mirai runs off a hydrogen fuel cell. www.toyota.co.uk/mirai as does the Hyundai ix35 and Honda Clarity
There aren't very many hydrogen filling stations in the UK which rather limits its appeal
Waylander
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2You should try to improve your answers: make links, elaborate, maybe add pictures and stuff. They seem rather comment-like. – Mithoron Jul 11 '17 at 15:48