Magnetic heating keeps carbon from clogging CO2 electroreduction catalysts

Carbonate build-up is one of the quiet killers of carbon dioxide electroreduction systems. As CO2 is converted at the cathode, local alkalinity drives the formation of carbonate and bicarbonate deposits that choke efficiency and shorten device lifetimes. A study published in Nature Catalysis on 22 October 2026 reports a way to fight back: applying an external alternating magnetic field that heats the catalyst surface locally, suppressing the precipitation before it starts.

The researchers, led by Wenda Zhou and Shouguo Wang, designed two ferromagnetic high-entropy alloys, CrMnNiZnPd and CrNiCuZnAg, synthesised through a nebulization-blast strategy. When placed under an alternating magnetic field, the confined alloys generate a localized heating field around the catalyst. According to the abstract, this heating reduces the build-up of hydroxide ions and increases the solubility of carbonate and bicarbonate species at the catalyst-electrolyte interface, thereby inhibiting precipitation.

The performance gains were substantial. In potassium bicarbonate electrolyte, the CrMnNiZnPd catalyst showed superior activity towards single-carbon products under the magnetic field, while CrNiCuZnAg favoured multicarbon products, both compared with operation without the field. Crucially, both systems ran stably for more than 200 hours, a durability benchmark that matters enormously for any prospective industrial deployment of CO2 electroreduction.

What makes the result potentially significant is its generality. The improved performance and durability persisted not only in alkaline potassium hydroxide but also in non-buffered potassium chloride electrolytes, suggesting the magnetic heating strategy works across different electrolyte chemistries rather than being an artefact of one particular system.

The authors frame alternating-magnetic-field-induced local heating as an effective tool for regulating the interfacial reaction microenvironment, with potential for mitigating carbonate-related limitations in CO2 electroreduction.

Subject of Research: Using alternating magnetic field-induced local heating in ferromagnetic high-entropy alloys to suppress carbonate formation in CO2 electroreduction

Article Title: Inducing local heating fields in ferromagnetic high-entropy alloys to inhibit (bi)carbonate formation for durable CO2 electroreduction

Article References: Zhou, W., Yuan, C., Luo, X., Chen, M., Zhang, J., Liu, S., Lei, W., & Wang, S. (2026). Inducing local heating fields in ferromagnetic high-entropy alloys to inhibit (bi)carbonate formation for durable CO2 electroreduction. Nature Catalysis, 9(10), 1158-1168. https://doi.org/10.1038/s41929-026-01619-3

Image Credits: AI Generated

DOI: 10.1038/s41929-026-01619-3

Keywords: CO2 electroreduction, carbonate precipitation, high-entropy alloys, alternating magnetic field, local heating, electrocatalysis, catalyst durability, interfacial microenvironment, Nature Catalysis, Inducing, local, heating