Electrochemical conversion of carbon dioxide into useful chemicals and fuels is one of the more promising routes for putting low-carbon electricity to work in heavy industry, but it comes with a stubborn logistical problem: the process usually demands high-purity CO2, which must first be captured from dilute sources and then released from the capture material in an energy-intensive regeneration step.
The approach, known as reactive carbon capture, merges the two steps into one. The catch has been durability. Existing reactive-capture systems degrade quickly, and the new paper identifies a chemical culprit rooted in the process itself: the pH swing that makes reactive capture work also creates an acidic microenvironment at the cathode, and that acidity accelerates demetallation, the leaching of metal atoms out of the molecular catalyst.
The team, led by researchers including Zunmin Guo, Feng Li and David Sinton, constructed a catalyst in which cobalt phthalocyanine molecules are covalently linked and supported on carbon nanotubes. Rather than trying to shield the catalyst entirely from that attack, the designers built in a mechanism that turns the damage to advantage.
In the resulting material, the early loss of roughly half of the cobalt centres generates vacancies in the molecular network. Those vacancies then trigger a cooperative contraction of the neighbouring cobalt sites, which strengthens the coordination between each remaining cobalt atom and its surrounding nitrogen ligands. The strengthened Co–N bonds resist further demetallation, so the initial leaching effectively stops. The authors describe this as a self-reinforcing vacancy–network interaction: the catalyst absorbs an early hit and emerges more robust than before.
The performance figures reported in the abstract are specific. The catalyst sustained continuous operation for over 1,000 hours at a current density of 50 milliamperes per square centimetre, converting CO2 to carbon monoxide with a Faradaic efficiency of approximately 80 percent, meaning that about four-fifths of the electrons passing through the cell went into the desired product rather than side reactions such as hydrogen evolution. The process achieved an energy efficiency of 39 percent at a cell voltage of 2.9 volts, figures the authors present as a pathway towards robust molecular catalysts for reactive carbon capture and electrochemical conversion.
Reactive capture avoids the desorption step that dominates the energy budget of conventional capture-then-conversion schemes, so its theoretical appeal is considerable.
The study is presented in five main parts: a schematic illustration of the reactive-capture concept, an analysis of the key challenges that have limited previous systems, computational studies of the stability of the covalently linked cobalt phthalocyanine with cobalt vacancies, measurements of reactive-capture performance, and in situ measurements probing the origin of the stability improvement.
Several caveats deserve emphasis. The 39 percent energy efficiency at 2.9 volts, while a meaningful benchmark for a combined capture-and-conversion process, still leaves substantial room for improvement before the economics compete with mature chemical processes. The authors themselves frame the work as providing a pathway towards robust molecular catalysts, a statement about design principles rather than a claim of commercial readiness.
Even with those limits, the conceptual contribution is notable. This work inverts that logic: it allows a controlled amount of degradation to occur and relies on the structure of the covalently linked molecular network to convert that degradation into a stabilising rearrangement.
Subject of Research: Durable molecular catalysts for electrochemical reactive CO2 capture and conversion to carbon monoxide
Article Title: Durable reactive CO2 capture exceeding 1,000 h via self-reinforcing molecular catalysts
Article References: Guo, Z., Li, F., Wang, C., Xiao, Y. C., Angizi, S., Wang, R., Sun, Q., Zhu, J., Peng, K.-S., Shen, Y.-J., Lu, Y.-R., Liu, J., Wang, Q., Wibawa, S., Shao, Y.-C., Ishii, H., Yamada, K., Ohmasa, Y., Hiroi, S., … Sinton, D. (2026). Durable reactive CO2 capture exceeding 1,000 h via self-reinforcing molecular catalysts. Nature Energy. https://doi.org/10.1038/s41560-026-02159-7
Image Credits: AI Generated
DOI: 10.1038/s41560-026-02159-7
Keywords: reactive carbon capture, CO2 reduction, cobalt phthalocyanine, carbon nanotubes, demetallation, electrocatalysis, Faradaic efficiency, carbon monoxide, pH swing, catalyst durability, Nature Energy, Durable
News Source: Bethany Barker. (November 5, 2026). Self-reinforcing cobalt catalyst keeps reactive CO2 capture running past 1,000 hours. Scienmag.
