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A UNSW-led team has shown that sunlight can turn glycerol, the main waste stream from biodiesel production, into hydrogen and higher-value chemicals in one reaction. A zinc indium sulfide photocatalyst carrying very small amounts of nickel and cobalt produced roughly ten times more hydrogen than the unmodified catalyst in visible-light tests, while shifting glycerol conversion toward glyceraldehyde and dihydroxyacetone. The result is a laboratory demonstration, not yet a commercial process.
Why biodiesel glycerol is a problem worth solving
Biodiesel plants generate approximately 100 kilograms of glycerol for every tonne of biodiesel, according to the Australian Nuclear Science and Technology Organisation (ANSTO) in 2026. Crude glycerol can sell for as little as US$0.11 per kilogram, particularly when impurities make purification expensive. Treating that stream as a feedstock instead of a disposal burden could improve the economics of biodiesel and reduce waste.
Glycerol is chemically useful but difficult to upgrade selectively. Under oxidation conditions it can follow several competing pathways, producing different molecules in different proportions. A process that makes hydrogen while steering the carbon into saleable products is therefore more valuable than one that simply breaks glycerol down.
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What glycerol photoreforming does
Photoreforming uses light to activate a semiconductor catalyst. When the catalyst absorbs photons, it creates energetic electrons and positively charged holes. The electrons can drive hydrogen evolution, while holes oxidize glycerol on the catalyst surface. In principle, the same light input produces hydrogen and converts the organic feedstock rather than consuming an expensive sacrificial chemical solely to make hydrogen.
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The two useful outputs
- Hydrogen: generated through the light-driven reduction side of the reaction.
- Organic products: formed when glycerol is oxidized. In this work, the catalyst was tuned to favor glyceraldehyde and dihydroxyacetone.
ANSTO gives approximate values of US$75 per kilogram for glyceraldehyde and US$150 per kilogram for dihydroxyacetone. Those figures indicate potential product value, not a guaranteed selling price or revenue from the reported experiments; actual economics would depend on concentration, purity, separation and market demand.
What the nickel and cobalt changed
The base material was zinc indium sulfide. The researchers added very small amounts of nickel and cobalt as a cocatalyst. Under visible light, that modification increased the hydrogen-evolution rate by approximately ten times compared with unmodified zinc indium sulfide in the reported tests.
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| Feature | Unmodified zinc indium sulfide | Nickel-cobalt modified material |
|---|---|---|
| Hydrogen evolution | Baseline rate in the study | Approximately ten times the baseline under the reported visible-light conditions |
| Dominant glycerol pathway | Predominantly a hydroxyacetone pathway | More conversion toward glyceraldehyde and dihydroxyacetone |
| Role of surface metals | No nickel-cobalt cocatalyst | Nickel and cobalt sites promote hydrogen production and redirect reaction pathways |
| Test environment | Simulated sunlight; the report describes the resulting hydrogen rate as competitive with other published solar glycerol-photoreforming systems | |
The key advance is not simply a faster reaction. It is control over selectivity: changing the catalyst surface altered where glycerol’s carbon atoms ended up while also improving hydrogen production.
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The team used in-situ X-ray absorption spectroscopy at the Australian Synchrotron to follow the nickel and cobalt sites during illumination. Fixed-energy XAS tracked changes at the metal sites, while in-situ synchrotron infrared microspectroscopy followed molecules and reaction intermediates on the catalyst surface.
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The measurements showed that the metal-site changes occurred in less than one second after the light was applied. When the light was removed, the changes reversed. Dark-control experiments confirmed that the behavior was caused by illumination rather than by an unrelated change during measurement. Dr Bernt Johannessen of ANSTO said the instruments allowed the team to observe the nickel and cobalt sites as the catalyst responded in real time.
Why steering products matters
Glycerol oxidation can produce mixtures, and separating a low-value mixture may erase the benefit of upgrading the feedstock. Glyceraldehyde and dihydroxyacetone are more valuable target chemicals than crude glycerol, so directing the reaction toward them could reduce the amount of unwanted material that must be removed.
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Dr Denny Gunawan of UNSW described the opportunity as doing two useful things at once: generating hydrogen and converting a low-value by-product into more valuable chemicals. The work also supports a broader catalyst-design strategy: identify which surface states control each pathway, then adjust the catalyst to favor the desired product rather than accepting whatever mixture forms naturally.
What has—and has not—been demonstrated
The reported experiments were conducted with simulated sunlight and at laboratory scale. ANSTO’s comparison with other systems is a comparison with published research results, not evidence of a commercial-scale advantage. The report does not establish long-term catalyst durability, performance with the variable impurities found in crude glycerol, continuous reactor operation, product-separation costs, lifecycle greenhouse-gas emissions or full commercial economics.
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Questions a scale-up project must answer
- How does the nickel-cobalt catalyst perform over many illumination and shutdown cycles?
- Can untreated or partially purified biodiesel glycerol be used without poisoning the catalyst?
- What light intensity, glycerol concentration and reactor geometry give the best hydrogen productivity?
- Can hydrogen be separated safely while glyceraldehyde and dihydroxyacetone are recovered at useful purity?
- How much nickel, cobalt and zinc indium sulfide are required, and can the catalyst be recycled without losing activity?
- Does manufacturing and operating the system deliver a net environmental benefit after energy, water and separation requirements are counted?
Where this research fits
Sunlight-driven glycerol oxidation is an active research area. A 2024 peer-reviewed review identified selectivity control and mechanistic understanding as persistent challenges. A 2024 study reported visible-light hydrogen evolution alongside glycerol oxidation using nickel/cobalt phosphate–titanium dioxide composites, while a 2025 study indexed by PubMed coupled glycerol conversion to lactic acid with hydrogen production using a defined heterojunction catalyst. These studies demonstrate a broader direction in photocatalysis; they do not establish that any of the approaches is ready for industrial deployment.
The UNSW-led result adds unusually direct evidence about how cocatalyst sites change during illumination and how those changes correlate with product pathways. As Gunawan put it, understanding those controls is a step toward using solar energy to make hydrogen while directing the remaining carbon into useful products instead of waste.
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