What happened
- Seven researchers, with Yun, Bak, Jung and Kim among the authors, published on 5 November 2026 in Nature Communications a catalyst that electrochemically reduces carbon dioxide even when it is very dilute.
- Industrial flue gases typically contain only 3% to 15% CO₂. Reducing it directly from such mixtures would avoid costly upstream purification.
- The problem is that, with so little CO₂ available, mass transport limits activity and hydrogen formation competes, and the molecular factors governing the process are poorly understood.
- The team shows that enriching in pyridinic nitrogen single-atom nickel catalysts, anchored in a nitrogen-doped carbon matrix, allows efficient reduction under those conditions.
Why it matters
- Capturing and purifying CO₂ before converting it is a large part of the cost of these technologies. A catalyst that works with dilute gas shortens that path.
- The work turns attention to the nitrogen environment around the metal and not just the metal, a design variable that can be tuned.
- The authors propose a transferable principle for designing CO₂ reduction catalysts when little gas is available.
The number
3% to 15%. That is the range of CO₂ that industrial flue gases typically hold, according to the paper, the concentration the new catalyst must handle.
Context
The researchers varied the ratio of pyridinic to pyrrolic nitrogen in well-defined nickel sites, to find out the role of the local nitrogen environment and not just the central metal atom.
With electronic-state analysis and density functional theory calculations, they conclude that pyridinic nitrogen forms a reversible adduct with CO₂. That adduct raises the local availability of the gas near the active nickel through a desorption and re-adsorption relay, without altering the reaction path of the nickel site itself.
That is, the neighbouring nitrogen works as a small reserve of CO₂ that keeps the active site fed. This is a laboratory study of catalysts, and the abstract reports no tests on real industrial gases or on the material’s stability over long periods, so the “industrially relevant conditions” of the title refer to concentration and not to a plant in operation.
At Mamífero we follow the capture and use of CO₂. We reported that a 2-nanometre carbon membrane separates CO₂ with high permeance and that more than 400 designed enzymes degrade plastic. Also that chemists in Berlin take silicone apart to its monomer to recycle it and that above 2 °C the Earth would keep warming even with zero emissions.
What’s next
- Testing the catalyst with real combustion gas mixtures, with impurities, is the missing step.
- The material’s stability in prolonged operation is another open question.
- The design principle could be applied to other metals and carbon matrices.
Bottom line
A nickel atom does the work, but the nitrogen around it decides how much CO₂ reaches it. In gases poor in CO₂, the neighbourhood matters as much as the metal.
Sources
- Yun, Bak, Jung, Kim et al., “Molecular-level control of nitrogen sites enables CO2 electro-reduction under industrially relevant conditions”, Nature Communications, 5 November 2026, DOI 10.1038/s41467-026-79247-5. This note is based on the paper’s abstract.
- Cover image: W.carter, CC BY-SA 4.0, via Wikimedia Commons
Edited by Rodrigo Cornejo. How we select and verify: who writes these notes.
