Why hydrogen is such a good energy carrier?

Question

BlackTom AI · Accepted Answer

To begin, let's restate the question and the answer choices to ensure clarity about what's being evaluated.
Question: Why hydrogen is such a good energy carrier?
Answer options:
a. Hydrogen can easily be stored as a liquid
b. It's abundantly available in usable form
c. It can deliver or store a tremendous amount of energy
d. It doesn't produce CO2 emissions when used

Now, evaluate each option in turn, noting why it is or isn't correct.
Option a: 'Hydrogen can easily be stored as a liquid' This claim is misleading. Liquid hydrogen storage is technically possible but requires cryogenic cooling to very low temperatures and involves significant energy input and insulation challenges. Calling it 'easy' ignores these practical hurdles, so this statement is not accurate as a general assertion about hydrogen as an energy carrier.
Option b: 'It's abundantly available in usable form' In reality, hydrogen is not freely abundant in a directly usable form on Earth. It is mostly bound up in water and hydrocarbons and must be produced from other resources (e.g., water electrolysis, natural gas reforming). Therefore, this statement overstates the ease of access to usable hydrogen and is incorrect.
Option c: 'It can deliver or store a tremendous amount of energy' This is correct. Hydrogen has a very high specific energy by mass (energy per unit mass), making it an efficient energy carrier for storing large amounts of energy, even though its volumetric energy density is lower at ambient conditions. This property underpins its use in energy storage, fuel cells, and potential long-range energy applications.
Option d: 'It doesn't produce CO2 emissions when used' This is broadly true in many hydrogen usage scenarios, especially when the hydrogen is produced without emitting greenhouse gases and when it is used in fuel cells or combustion with oxygen, producing water as a byproduct. However, caveats exist in the broader lifecycle (production, supply chain) and in some high-temperature combustion where small amounts of CO2 could form if carbon-containing substances are present. Relative to direct hydrocarbon fuels, immediate combustion of pure hydrogen does not emit CO2, so as an energy carrier, this statement captures a key benefit, though it should be considered in context.

In summary, among the given options, c correctly highlights hydrogen's high energy delivery/storage capacity, while d points to the CO2-emission advantage in use. Options a and b contain inaccuracies or oversimplifications about practicality and availability that undermine their validity as statements about hydrogen as an energy carrier.

Why hydrogen is such a good energy carrier?Multiple choice

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