CO2 plasma conversion is significantly more energy-efficient than CO2 electrolysis for carbon monoxide production, requiring around 1,100 kWh per tonne of CO2 converted, roughly five times less energy than competing electrochemical routes. That efficiency advantage is what makes plasma-based CO production commercially competitive with fossil-derived carbon monoxide, without relying on a sustainability premium to justify the cost. The sections below break down the technical differences, byproduct profiles, scalability characteristics, and the conditions under which each technology makes the most sense for industrial operators.

Which technology converts CO2 to CO more efficiently?

CO2 plasma conversion is the more energy-efficient technology for producing carbon monoxide from CO2. D-CRBN’s Plasma ARCâ„¢ platform achieves a conversion energy requirement of approximately 1,100 kWh per tonne of CO2, with a single-pass CO2 conversion rate of 90.5%. By comparison, CO2 electrolysis routes typically require substantially more electrical input to achieve equivalent conversion yields, making plasma conversion roughly five times more efficient than the next-best electrochemical alternative.

The efficiency gap comes down to the underlying physics. Plasma converts electrical energy directly into a high-energy state that selectively breaks the carbon-oxygen bond in CO2 at extremely high temperatures, exceeding 1,500°C inside the reactor, without the electrochemical overpotentials and membrane losses that reduce efficiency in electrolysis systems. An embedded downstream carbon bed (a gasification step) within D-CRBN’s reactor design further reduces net electricity consumption by recovering and utilizing energy within the same process loop.

For industrial operators, this efficiency difference is not merely a technical metric, it determines whether low-carbon CO production can compete on price with fossil-derived carbon monoxide. At current energy costs, a technology that requires five times more electricity per tonne of output cannot realistically undercut fossil feedstock pricing. Plasma conversion, by contrast, reaches a cost structure where electrified CO production becomes economically rational without requiring carbon pricing to subsidize the gap.

What are the main differences in how each process works?

CO2 plasma conversion and CO2 electrolysis both use electricity to split CO2 into carbon monoxide and oxygen, but they do so through fundamentally different mechanisms. Plasma conversion uses a high-energy electrical discharge to create a plasma state, an ionized gas at extremely high temperatures, that thermally and chemically activates CO2 molecules and breaks the C-O bond. CO2 electrolysis uses an electrochemical cell, typically with a solid oxide or polymer electrolyte membrane, to drive the same reaction at lower temperatures through ionic transport and catalytic electrode reactions.

How plasma conversion works

In a plasma reactor, renewable electricity generates a sustained electrical arc or discharge that heats the gas stream to temperatures well above what conventional chemical reactors can reach. CO2 molecules entering this plasma field are dissociated, the carbon-oxygen bond breaks, producing CO and atomic oxygen. In D-CRBN’s system, a solid carbon feed (such as biochar or carbon recovered from methane pyrolysis) reacts with the released oxygen, preventing recombination and driving the reaction toward high CO yield. The reactor operates at ambient pressure, requires no vacuum technology, and uses steel as its primary structural material, keeping both capital and maintenance costs low.

How CO2 electrolysis works

CO2 electrolysis passes an electrical current through a cell containing CO2 on one side and a cathode catalyst on the other. At the cathode, CO2 is reduced to CO; at the anode, oxygen is released. The process is temperature-controlled and operates at far lower temperatures than plasma, which reduces thermal stress on materials but also limits reaction rates and introduces efficiency losses through overpotentials, ionic resistance, and membrane degradation. Solid oxide electrolysis cells (SOECs) operate at elevated temperatures (typically 700-900°C) and achieve better efficiency than low-temperature variants, but still fall short of plasma conversion on an energy-per-tonne basis.

What byproducts does each technology produce?

CO2 plasma conversion, as implemented in D-CRBN’s Plasma ARCâ„¢ system, produces carbon monoxide as the primary output without generating carbon black or other solid byproducts. The oxygen released during CO2 splitting reacts with the solid carbon feed within the reactor, so it is consumed in-process rather than emitted. The result is a clean CO output stream. CO2 electrolysis similarly targets CO as the primary product, but can generate unwanted byproducts including formate, methane, and other hydrocarbons depending on catalyst selectivity and operating conditions, particularly in low-temperature systems where selectivity control is more challenging.

One practical advantage of plasma conversion is its tolerance for impure input streams. D-CRBN’s reactor can handle CO2 streams containing up to 50% nitrogen and contaminants such as hydrogen sulfide, conditions common in real industrial off-gas capture scenarios. This means the upstream purification requirements are lower, and the risk of byproduct formation from contaminant reactions is managed within the reactor design itself. Electrolysis systems, particularly those using membrane-based cells, are generally more sensitive to feed gas impurities, which can degrade catalyst performance and membrane integrity over time, increasing the likelihood of off-spec byproduct formation.

Which technology is better suited for industrial-scale deployment?

For heavy industrial deployment at scale, CO2 plasma conversion currently holds a stronger position than CO2 electrolysis. Plasma systems operate at ambient pressure, use standard steel construction, require no rare-earth materials, and can be deployed in modular containerized units that integrate directly into existing industrial infrastructure without requiring facility redesign. D-CRBN’s systems are validated at industrial pilot scale, including the world’s first trial at a major European steel plant, and are designed for plug-and-play deployment across distributed and large-scale sites.

CO2 electrolysis is a credible technology with active development across multiple research and commercial programs, but it faces several industrialization challenges that plasma conversion has already addressed. Electrolysis cells rely on membranes, catalysts, and sometimes rare or expensive electrode materials that degrade over time, creating maintenance cycles and replacement costs that affect total cost of ownership at scale. Stack scaling, moving from laboratory cells to industrial-throughput stacks, also introduces engineering complexity that has slowed commercial deployment timelines.

Plasma conversion’s fast on/off switching capability is another industrial advantage. The reactor can start and stop in response to renewable electricity availability, enabling operators to run the system during periods of surplus wind or solar power and pause during high-price grid periods. This flexibility, combined with AI-based energy optimization, allows electrified feedstock production to align with energy market dynamics, a feature that electrolysis systems can also offer in principle, but that plasma achieves with lower thermal inertia and faster response times.

Can plasma conversion also produce syngas, or only CO?

Plasma conversion can produce both carbon monoxide and syngas, it is not limited to CO output. D-CRBN’s Plasma ARCâ„¢ platform supports two distinct conversion routes within the same reactor design: a CO2-to-CO route and a biogas-to-syngas route. The syngas route combines CO2 directly with biomethane (CH4) inside the plasma reactor, producing syngas (CO + 2H2) without requiring any external hydrogen input. This makes it particularly valuable for operators with access to biogas streams from wastewater treatment, agricultural digesters, or landfill operations.

The syngas produced through the biogas route achieves an H2:CO ratio of approximately 2:1, the standard ratio required for downstream synthesis of methanol, Fischer-Tropsch fuels, and other chemical products. When both the biomethane and the CO2 feedstock are of biogenic origin, the resulting syngas qualifies as green syngas, enabling the production of sustainable aviation fuel (SAF), e-methanol, and other renewable chemicals without fossil inputs and without needing separately produced green hydrogen. Operators interested in electrified syngas production can access both routes through the same modular platform, choosing the appropriate feedstock configuration for their site.

This dual-route capability gives plasma conversion a broader application footprint than technologies focused solely on CO2 reduction to CO. A single installed system can serve different production objectives depending on available feedstocks and market demand, increasing the asset’s flexibility and return on investment across changing operational conditions.

When should an industrial operator choose plasma over electrolysis?

An industrial operator should choose CO2 plasma conversion over electrolysis when the priority is energy efficiency at competitive cost, tolerance for impure CO2 streams, fast deployment into existing infrastructure, and flexibility to run on intermittent renewable electricity. Plasma conversion is the stronger choice for operators in steel, chemicals, and petrochemicals who need to produce carbon monoxide or syngas at industrial throughput without rebuilding existing assets or investing in complex electrochemical stack systems.

Specifically, plasma conversion is the better fit when:

• The available CO2 stream is diluted or contains impurities such as nitrogen or hydrogen sulfide, plasma handles these conditions without upstream purification that electrolysis membranes typically require
• The operator needs on-site, modular CO or syngas production that can scale incrementally from below 100 ktpa to large industrial volumes using the same underlying technology
• The site has access to intermittent renewable electricity and wants to use surplus solar or wind power productively, converting it into stored chemical energy in the form of CO or syngas
• Capital cost constraints are significant, plasma systems carry a CAPEX approximately 50% lower than the next-best alternative electrochemical route, with steel as the primary construction material
• The operator wants to avoid byproduct complexity and produce a clean CO output stream without carbon black or mixed hydrocarbon byproducts

Electrolysis may be preferable in contexts where very low-temperature operation is a site constraint, where the CO2 input is already highly purified, or where specific electrochemical selectivity toward products other than CO is the goal. For the majority of heavy industrial CO production applications, however, the combination of energy efficiency, industrial validation, and deployment simplicity positions plasma conversion as the more practical and cost-competitive pathway in 2026 and beyond.

For industrial operators evaluating their options, D-CRBN offers site-specific design consultation to identify the right configuration for existing CO2 streams and production targets. Contact D-CRBN to discuss how plasma-based CO2 recycling can integrate into your operations.

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