new findings

Rice University and UH labs team up to improve emerging carbon capture technique

New research from Rice and UH has helped boost the lifespan of CO2RR systems, a newer technology used for carbon capture. Photo via htxenergytransition.org

A team of researchers led by professors from two Houston universities has discovered new methods that help stabilize an emerging technique known as carbon dioxide reduction reaction, or CO2RR, that is used for carbon capture and utilization processes.

The team led by Rice University’s Haotian Wang, associate professor in chemical and biomolecular engineering, and Xiaonan Shan, associate professor of electrical and computer engineering at University of Houston, published its findings in a recent edition of the journal Nature Energy.

CO2RR is an emerging carbon capture and utilization technique where electricity and chemical catalysts are used to convert carbon dioxide gas into carbon-containing compounds like alcohols, ethylene, formic acids or carbon monoxide, according to a news release from Rice. The result can be used as fuels, chemicals or as starting materials to produce other compounds.

The technology is used in commercial membrane electrode assembly (MEA) electrolyzers to convert carbon dioxide into valuable compounds, but the technology isn’t perfected. A significant challenge in CO2RR technology has been the accumulation of bicarbonate salt crystals on the backside of the cathode gas diffusion electrode and within the gas flow channels. The salt precipitates block the flow of carbon dioxide gas through the cathode chamber, which reduce the performance and can cause a failure of the electrolyzers.

The goal in the study was to understand why and how bicarbonate salts form during this reaction. The Rice and UH teams worked together using operando Raman spectroscopy, which is a technique that allows researchers to study the structure of materials and any precipitates that adhere to them while the device is functioning.

“By utilizing operando Raman spectroscopy and optical microscopy, we successfully tracked the movement of bicarbonate-containing droplets and identified their migration pattern,” Shan said in the release. “This provided us the information to develop an effective strategy to manage these droplets without interrupting system stability.”

Next, the team worked to prevent the salt crystals from forming. First, they tested lowering the concentration of cations, like sodium or potassium, in the electrolyte to slow down the salt formation. This method proved to be effective.

They also coated the cathode with parylene, a synthetic polymer that repels water, like Teflon, which also notably improved the stability of the electrolyzer and prevented salt accumulation.

“Inspired by the waxy surface of the lotus leaf which causes water droplets to bead up and roll off, carrying off any dirt particles with it and leaving the leaf’s surface clean, we wondered if coating the gas flow channel with a nonstick substance will prevent salt-laden droplets from staying on the surface of the electrodes for too long and, therefore, reduce salt buildup.” Wang said in the release.

According to Wang, these relatively simple discoveries can extend the operational lifespan of CO2RR systems from a few hundred hours to over 1,000 hours.

The findings also have major implications for commercial applications, Shan added.

“This advancement paves the way for longer-lasting and more reliable (CO2RR) systems, making the technology more practical for large-scale chemical manufacturing,” Shan said in the release. “The improvements we developed are crucial for transitioning CO2 electrolysis from laboratory setups to commercial applications for producing sustainable fuels and chemicals.”

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A View From HETI

China-based Trina Storage is starting its U.S. expansion in Houston. Photo via trinasolar.com

Trina Storage and FlexGen, a North Carolina-based company that develops integrated energy storage systems, are bringing a 371-megawatt battery energy storage system to Houston. The project will be the largest grid-scale deployment project in North America by Trina Storage, which is a business unit of China-based Trina Solar.

"This project is a testament to Trina Storage's ability to provide a fully bankable, integrated energy storage solution that meets the evolving needs of the market," Terry Chen, vice president of Trina Storage North America, said in a news release. "As our first grid-scale deployment in North America, this achievement reflects the industry's confidence in our technology and our commitment to de-risking energy storage investments and supporting the energy transition in the region."

The project, developed by Boulder, Colorado-based SMT Energy, will utilize Trina Storage's advanced Elementa 2 battery storage system, which is designed to optimize energy performance and reliability. The system uses Trinas proprietary lithium iron phosphate cells that are more than 95 percent energy efficient, according to the company.

FlexGen will provide system integration and use its HybridOS energy management software. The HybridOS allows site operators to manage systems, detect issues faster and predict maintenance needs.

"This collaboration with Trina Storage and SMT Energy represents another major step in accelerating the deployment of flexible energy storage assets to meet growing demand," Diane Giacomozzi, COO at FlexGen, added in the release. "By pre-integrating FlexGen HybridOS with Trina's Elementa 2 energy storage solution in our Durham Innovation Lab, we're enabling faster project delivery and optimized performance from the first moment of operation."

Trina Storage currently has 10 energy storage facilities in China and two in the UK. The Houston facility is part of its plans to expand across the U.S., according to a LinkedIn post form the company.

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