Hydrogen is often described as a clean fuel because burning it, or using it in a fuel cell, produces only water. The problem is making it cleanly and cheaply. On 4 October 2026 chemists at Oregon State University reported a new light-activated material that makes hydrogen from water without an added precious-metal catalyst[1]. It belongs to a family you may have read about here before: metal-organic frameworks, the subject of the 2025 Nobel Prize in Chemistry.
Grey, blue and green hydrogen
GCSE core| Type | How it is made | CO₂? |
|---|---|---|
| Grey | Steam reforming of methane: CH₄ + H₂O → CO + 3H₂ | Yes, released |
| Blue | As grey, with the CO₂ captured and stored | Mostly captured |
| Green | Splitting water using renewable electricity or sunlight | None from production |
Green hydrogen currently costs roughly $5 per kilogram, compared with about $1.50 for hydrogen made from methane[1]. Most green hydrogen is made by electrolysis, which needs electricity and is only as clean as that electricity[1]. Using sunlight directly, with a photocatalyst, cuts out the middle step.
How a photocatalyst splits water
A-Level extensionOverall, splitting water is 2H₂O → 2H₂ + O₂. It is strongly endothermic, so energy must be supplied. In a photocatalyst, a photon of light lifts an electron from a lower energy level to a higher one. That excited electron is a good reducing agent: it can reduce hydrogen ions to hydrogen gas, 2H⁺ + 2e⁻ → H₂. The gap the electron leaves behind, called a “hole”, must be filled by an oxidation reaction, taking an electron from water or from another added substance.
Light lifts an electron across the energy gap. The excited electron reduces H⁺ to H₂; the hole left behind is filled by an oxidation. Simplified model; in BVR-19 the light is captured by sulfur-containing organic building blocks.
Quick check
In the half-equation 2H⁺ + 2e⁻ → H₂, what is happening to the hydrogen ions?
What makes BVR-19 different
A metal-organic framework is a crystal built from metal-containing nodes joined by organic linker molecules, like a molecular scaffold full of pores. In most MOF photocatalysts the metal parts do the key work, and an extra precious-metal co-catalyst (often platinum) is needed to actually release the hydrogen. In BVR-19 the team found the reverse:
“The organic component does the important work … our material uses its sulfur-containing organic building blocks to capture light energy and move electrons where they are needed to produce hydrogen.” Kyriakos Stylianou[1]
- The framework contains an unusual sulfur-to-sulfur bond in its organic building blocks[1].
- It needs no additional expensive metal catalyst[1].
- It forms spontaneously in water at room temperature, which lowers the energy needed to make it[1].
The study was published in the Journal of the American Chemical Society[1]. The news release did not give efficiency figures, so how BVR-19 compares with the best existing photocatalysts is not yet clear from public information.
The distinction students often miss
'No metal catalyst needed' is not the same as 'metal-free'.
Why it matters
Hydrogen made with sunlight and cheap, easily made materials could help decarbonise industries that are hard to electrify, such as fertiliser production, steelmaking and long-distance transport. The Oregon team describes the work as “a blueprint for designing better materials that can bring down the cost of green hydrogen”[1]. The open questions are efficiency, how long the material keeps working, and whether it can be scaled up.
Exam-style question
Hydrogen can be produced from methane or from water. Evaluate the use of a light-driven photocatalyst to produce hydrogen from water compared with steam reforming of methane. [4 marks]
Show model answer and mark breakdown
- steam reforming uses a fossil fuel (methane) and releases carbon dioxide, contributing to climate change (1 mark)
- a photocatalyst uses water and sunlight (a renewable energy source), so no CO₂ is released during production (1 mark)
- however, green hydrogen is currently more expensive (about $5/kg vs $1.50/kg) and photocatalysts may have low efficiency or limited lifetime (1 mark)
- conclusion: the photocatalyst route is more sustainable, but cost, efficiency and scale-up must improve before it can replace steam reforming (1 mark)
Examiner focus: balanced points on both methods (raw materials, energy source, CO₂, cost) and a justified conclusion.
Common mistake: saying hydrogen 'produces no pollution' without considering how the hydrogen itself was made.
Redox, electrolysis and catalysts are tested every year, and green hydrogen is a favourite context. Our GCSE chemistry tutoring builds them from the half-equations up. Related reading: artificial leaves take the same light-driven idea from biology.
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Sources and further reading
- ScienceDaily: Scientists just found a new way to make hydrogen from water (4 Oct 2026) — Oregon State, BVR-19, JACS, quotes, cost figures
- Wikipedia: Photocatalytic water splitting — background
- Wikipedia: Metal–organic framework — background
Last reviewed: 5 October 2026. Figures are typical published values and rules can change. Exam wording varies by specification, so check yours.
Frequently asked questions
What was discovered?
Chemists at Oregon State University, led by Kyriakos Stylianou, reported a light-activated material called BVR-19 that produces hydrogen from water without needing an added expensive metal catalyst. It is a metal-organic framework (MOF) whose sulfur-containing organic building blocks capture light and move electrons to where hydrogen is made. The work was published in the Journal of the American Chemical Society.
What is green hydrogen?
Hydrogen made from water using renewable energy, so producing it releases no carbon dioxide. Most hydrogen today is 'grey', made from methane by steam reforming, which releases CO₂. Green hydrogen costs roughly $5 per kilogram compared with about $1.50 for hydrogen from methane, which is why cheaper methods matter.
What is a photocatalyst?
A substance that absorbs light and uses that energy to speed up a chemical reaction without being used up. In water splitting, light lifts an electron to a higher energy level; that electron reduces hydrogen ions to hydrogen gas, while the 'hole' left behind is filled by an oxidation reaction.
Why does avoiding a metal co-catalyst matter?
Many light-driven hydrogen systems need small amounts of platinum or other precious metals to work well. These are scarce and expensive. A material whose organic parts do the job could make the process cheaper and more sustainable, and BVR-19 also forms spontaneously in water at room temperature.
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