Breaking the Carbon Bottleneck: Measuring the Microscopic Pulse of Next-Generation CO2 Electrolyzers

14 hours ago

4 min read

To tackle climate change, cutting emissions isn't enough—we need active methods to recycle carbon. CO2 electrolysis offers a compelling solution: it uses renewable electricity to convert captured carbon dioxide gas into useful fuels, plastics, and industrial feedstocks, effectively turning a major pollutant into a valuable resource.

The core technology behind this process is the membrane electrolyzer. Similar to a fuel cell operating in reverse, this device takes in CO2, water, and electricity, then splits them apart to form clean products.

The Scalability Problem

While these devices work well in small lab experiments, scaling them up to industrial levels introduces major hurdles:

Energy Loss: Upgrading to larger, industrial-sized membranes often leads to significant energy loss as heat.
Catalyst Degradation: Electrocatalysts—the materials accelerating the chemical reaction—frequently slow down or fail under high-powered operational conditions.
System Bottlenecks: Researchers struggle to identify whether performance drops stem from slow chemical reactions on the catalyst surface or sluggish electrical charge movement through the membrane assembly.

The Core Innovation: Tracking Electron "Relaxation Time"

To solve this efficiency bottleneck, Dr. Ahmed Halilu and his team at Universiti Malaya are focusing on a metric called Charge Transport Relaxation Time.

Imagine a busy highway merging from four lanes into one. If cars move through smoothly, traffic flows. If drivers pause before merging, a massive bottleneck forms.

In an electrocatalyst, electrons travel through the material to drive the chemical conversion of CO2.

Relaxation Time measures how long it takes for electrical charges within the catalyst to reset and respond to changing electrical signals.
A shorter relaxation time means electrons move effortlessly, enabling rapid chemical conversion with minimal energy loss.
A longer relaxation time points to internal resistance, where charges get trapped or delayed, converting valuable electricity into wasted heat.

Diagnostic Breakthrough

By measuring relaxation times directly inside an operating membrane electrolyzer, researchers can diagnose performance bottlenecks in real time. Instead of relying on trial-and-error catalyst design, this approach provides clear data on exactly where and why energy losses occur.

How the Measurement Works

To measure this microscopic pulse without tearing the electrolyzer apart, Dr. Halilu’s team relies on non-destructive diagnostic techniques. The process begins by sending delicate alternating electrical signals through the operational membrane cell across a wide spectrum of frequencies. Think of this step as an internal electronic sonar scan: by probing how the system responds to different frequency inputs, the researchers can watch how electrical charges move through the catalyst layer in real time.

Once the electrical response is recorded, advanced mathematical modeling extracts the individual relaxation signatures of the catalyst. This step is crucial because an electrolyzer is a crowded system where physical gas bubbles, liquid fluids, and subatomic electrons are all moving at once. Time-domain analysis separates these competing factors, allowing scientists to isolate the lightning-fast movement of electrons from the much slower physical movement of reactants.

Image shows a mock-up of the research by Dr Ahmed Halilu’s team.

Finally, the team maps these relaxation times directly at the triple-phase boundary—the microscopic junction where the solid catalyst, the liquid electrolyte, and the gas-phase carbon dioxide intersect. Pinpointing charge behavior at this precise boundary reveals exactly where energy is being lost to resistance and converted into unwanted heat. Instead of guessing why a catalyst underperforms, researchers gain a clear, quantitative map of its operational bottlenecks under true working conditions.

From Laboratory Insights to Industrial Scale

Translating these micro-level electronic measurements into real-world industrial systems changes how engineers approach scale-up design. Rather than relying on traditional trial-and-error methods, scientists can now rationally design catalysts engineered specifically for rapid charge relaxation. This targeted approach dramatically improves catalytic performance while reducing the reliance on costly, scarce precious metals.

Beyond saving raw material costs, optimizing charge transport directly extends the operational lifespan of commercial electrolyzers. When electrons flow smoothly through the system without getting trapped, localized hot spots and internal stress points are eliminated. Protecting the sensitive polymer membranes from this premature heat degradation ensures that large-scale units can run continuously for thousands of hours without costly maintenance shutdowns.

Ultimately, this diagnostic breakthrough drives down the production cost per ton of converted carbon dioxide. By maximizing energy efficiency and extending hardware longevity, Dr. Halilu’s research at Universiti Malaya bridges the gap between lab-scale chemistry and commercial manufacturing. This work brings us one step closer to a circular carbon economy where industrial emissions are reliably transformed into sustainable, low-cost fuels and materials.

SDGs Addressed

	Through the electrocatalysis and production of clean byproducts that can be used for energy generation
	Through the innovation of a novel electrocatalysis system
	Through sustainable engineering to minimise chemical waste and improved resource efficiency and lower energy consumption
	Through CO2 reduction and carbon capture mechanisms that can be used to tackle greenhouse gas emissions at the source.

Researcher Featured

Dr Ahmed Halilu

Department of Chemical Engineering,

Faculty of Engineering, Universiti Malaya

Area of Expertise:

Chemical Engineering > Material Characterisation > Applied Engineering Systems

Get to know the researcher:

Dr. Ahmed Halilu is a researcher and academic in the Department of Chemical Engineering at Universiti Malaya. His research focuses on electrochemical systems, green energy generation, electrocatalytic CO2 conversion, and advanced catalysis aimed at sustainable process optimization. With extensive experience in bridging fundamental electrochemistry with scalable industrial and environmental solutions, Dr. Halilu contributes to driving innovation in clean energy technology and advancing multidisciplinary engineering initiatives.

For further inquiries, please contact:

Email: ahmed_h@um.edu.my

ORCID ID: https://orcid.org/0000-0003-0381-2365

Web of Science (WoS): https://www.webofscience.com/wos/author/record/N-9415-2016

Google Scholar: https://scholar.google.com/citations?user=4T4OR68AAAAJ

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