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Hydrogen plays an integral role in various industries due to its versatility. Global demand for hydrogen in 2023 was 97 million tonnes (Mt) according to the IEA Global Hydrogen Review 2024. The primary uses include:

Refining – 43Mt (44% of demand): Hydrogen is used to break down large, heavy hydrocarbon molecules into lighter, more valuable products like diesel, jet fuel, and gasoline and is useful to remove sulphur from fuels in the oil refining process.

Industrial Uses 54 Mt – (55.7% of demand): Hydrogens industrial uses can be broken up into ammonia (60%), where hydrogen is a key feedstock for producing ammonia, as well as for methanol production (30%), and lastly for direct reduced iron (DRI) in the iron and steel sector (10% of industrial demand). Hydrogen’s use in DRI is by refining and reducing metal ores (removing oxygen content) in its solid state without melting, -rather than using coke/metallurgical coal in blast furnaces.

Other uses: Hydrogen is also used for energy production in fuel cells to generate electricity, emitting only water vapor, making it a cornerstone of the green energy transition. Hydrogen also serves as a rocket propellant in aerospace due to its high energy density.

The global demand for hydrogen is expected to rise significantly (from ~100Mt in 2024 to ~150Mt by 2023 under NZE scenario) due to its potential to decarbonize sectors like transportation, heavy industry, and power generation. “Green hydrogen,” produced via water electrolysis powered by renewable energy, is particularly promising, and currently a tiny market. Countries and corporations are investing billions to scale up production and it’s projected that up to 45% of the ~150Mt hydrogen by 2030 will be from low-emission sources (currently <5%). Growth opportunities also lie in hydrogen storage and distribution technologies, vital for enabling its widespread adoption, particularly in the transportation sector. Currently Korea, China, Japan, USA and Europe are leading the fuel cell EV market, at around 90,000 vehicles global in 2024 (small vs 1.5 billion vehicles total). Investors are drawn to hydrogen’s role in achieving net-zero emissions, making it a long-term growth market from its current small role in the global energy mix. Long term catalysts for the hydrogen sector will be cheap and excess electricity supply, which could come from an abundance (over investment) of supply from renewables such as wind and solar.

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Globally, in 2023 around 97 million tonnes (Mt) of Hydrogen (H2) was produced. China accounted for around 30% of globally supply, followed by USA (~14%), Middle East (~14%) and India (~9%). Global production is estimated to reach 100Mt by the end of 2024, and under the Net Zero emissions by 2050 scenario, the hydrogen market is expected to reach close to 150Mtpa by 2030 (8.4% CAGR from present), and 45% of which is low-emission hydrogen (currently <5%).

Low emission hydrogen is still an extremely small market, making up around 5% of total hydrogen supply. Low emission hydrogen is produced in two ways, one of them called blue hydrogen from fossil fuels (natural gas), and the other being green hydrogen from electrolysis (using electricity).

Blue hydrogen is produced through a process called steam methane reforming (SMR), where natural gas (methane) is reacted with steam under high pressure and temperature to produce hydrogen and carbon dioxide. The hydrogen is then purified for use, while the CO₂ is typically captured and stored underground through carbon capture and storage (CCS) technology, which mitigates emissions. Despite being cleaner than grey hydrogen (produced without CCS), blue hydrogen still relies on fossil fuels, making it less sustainable than green hydrogen.

Green hydrogen is produced using electrolysis, a process that splits water (H₂O) into hydrogen (H₂) and oxygen (O₂) using electricity. For green hydrogen, the electricity must come from renewable sources such as solar, wind, or hydroelectric power, ensuring zero carbon emissions during production. Unlike blue hydrogen, green hydrogen does not rely on fossil fuels, making it a key technology for achieving carbon-neutral energy systems and supporting a clean hydrogen economy.

The downfall and critique of green hydrogen produced through electrolysis is that it typically has an energy efficiency of around 60-70%, meaning 30-40% of the input electricity is lost as heat or in the conversion process. This inefficiency arises from the energy required to split water molecules and from losses in the electrolyser system. Additionally, further energy losses occur if the hydrogen is compressed, liquefied, or transported, reducing the overall efficiency of the system to around 50-60% from renewable electricity to usable hydrogen energy.

Green hydrogen production inefficiencies could avoid this waste if production is aligned with periods of excess electricity generation from renewable sources, such as during peak solar production or strong winds, thus preventing renewable energy curtailment by converting recess electricity into hydrogen gas which could be used in industry, and thus is a practical form of energy storage that is not in the form of batteries.

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The story of hydrogen dates back to ancient philosophy, but its formal discovery began in the 16th century with Paracelsus, who observed bubbles forming during the reaction of metals with acids. However, it was Henry Cavendish in 1766 who first identified hydrogen as a distinct substance, calling it “inflammable air.” Cavendish also demonstrated that water is a compound of hydrogen and oxygen, a groundbreaking revelation at the time.

Hydrogen’s name, derived from the Greek words for “water” and “generator,” was coined by Antoine Lavoisier in the late 18th century. Its properties as an energy source were soon recognized, culminating in the first hydrogen-filled balloon flight by Jacques Charles in 1783, demonstrating its practical utility.
The 20th century saw hydrogen revolutionizing industries. Its use in the Haber-Bosch process catalyzed agricultural productivity by enabling large-scale fertilizer production. During World War II, hydrogen played a role in military applications, such as synthetic fuel production. Later, the space race highlighted its potential as rocket fuel, with NASA adopting liquid hydrogen for its Saturn V rockets.

Hydrogen played a central role in the development of the hydrogen bomb, a weapon significantly more powerful than atomic bombs. Unlike fission-based bombs, which split heavy atomic nuclei, the hydrogen bomb relies on nuclear fusion—the same process that powers the sun. The bomb uses isotopes of hydrogen, such as deuterium and tritium, which are forced to fuse under immense pressure and heat generated by a primary fission explosion. This fusion reaction releases an enormous amount of energy, exponentially increasing the bomb’s destructive power. The first hydrogen bomb, codenamed “Ivy Mike,” was detonated by the United States in 1952, marking a pivotal escalation in the nuclear arms race during the Cold War.

The late 20th and early 21st centuries marked a shift toward hydrogen’s environmental promise. Concerns over fossil fuel emissions spurred innovation in hydrogen fuel cells, culminating in the development of hydrogen-powered vehicles and renewable energy integration. Today, hydrogen is a symbol of hope in the fight against climate change, with governments and private enterprises striving to unlock its potential.

Hydrogen fuel cells generate electricity through an electrochemical reaction between hydrogen and oxygen, producing water as the only byproduct. This clean energy technology is gaining traction as a solution to decarbonize transportation. Unlike conventional batteries, fuel cells offer faster refueling times and longer ranges, making them suitable for heavy-duty vehicles like trucks, buses, and trains. The future potential of hydrogen-powered vehicles lies in expanding green hydrogen production, improving fuel cell efficiency, and building a comprehensive refueling infrastructure. As governments and automakers invest in hydrogen technology, it could complement battery-electric vehicles and play a critical role in achieving net-zero transportation systems globally.

The journey of hydrogen – from a mysterious gas to a key enabler of a sustainable future – epitomizes humanity’s ability to harness nature’s elements for progress. Its history reflects not only scientific ingenuity but also the adaptability required to address evolving global challenges.