ripple effect

UH team develops method to use electricity to remove harmful carbon from ocean waters

UH assistant professor Mim Rahimi published a paper on the development of his lab's emerging negative emissions technology known as electrochemical direct ocean capture. Photo via UH.edu

Researchers at the University of Houston are developing a new, cost-effective way to help rid oceans of harmful carbon dioxide and fight the effects of climate change.

UH assistant professor Mim Rahimi published a paper on the development of his lab's emerging negative emissions technology known as electrochemical direct ocean capture (eDOC) in the journal Energy & Environmental Science this month.

The paper details how Rahimi's team is working to create electrochemical tubes to remove dissolved inorganic carbon from synthetic seawater, according to a release from UH. The process aims to amplify the ocean’s ability to absorb carbon and can easily be integrated into existing on-shore and off-shore infrastructure, including desalination plants and oil rigs.

Unlike other methods that involve complex processes, expensive materials and specialized membranes, the eDOC method focuses on adjusting the ocean water's acidity using affordable electrodes.

“While eDOC won’t single-handedly turn the tide on climate change, it enriches our mitigation toolkit,” Rahimi said in a statement. “In this global challenge, every innovative approach becomes invaluable.”

Rahimi's research is funded by a $250,000 grant from the U.S. Department of Energy and preliminary research was sponsored by UH Energy’s Center for Carbon Management in Energy.

“The promise of eDOC is undeniable, but scaling it, optimizing costs and achieving peak efficiency remain challenges we’re actively addressing,” he added in a statement.

Late last month, UH shared details on another carbon removal project it is involved with–this time focused on direct air capture (DAC). Known as the Pelican Gulf Coast Carbon Removal study–led by Louisiana State University and including UH and Shell—the project looks at the feasibility of a DAC hub that would pull carbon dioxide from the air and either store it in deep geological formations or use it to manufacture various products, such as concrete.

In August, UH announced that the project received nearly $4.9 million in grants, including almost $3 million from the U.S. Department of Energy. Click here to read more.

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A View From HETI

Naomi Halas has pioneered insights into how light and matter interact at small scales, which led to the founding of Houston-based Syzygy Plasmonics. Photo by Jeff Fitlow/Rice University

Naomi Halas, a Rice University professor and co-founder of Syzygy Plasmonics, was elected to the Council of the National Academy of Sciences this month.

The council sets priorities for the nonprofit organization, which advises the federal government on scientific and technical matters. Halas will serve a three-year term on the council, beginning July 1.

“The council’s work is focused on the academy’s national leadership and governance,” Halas said in a news release. “It plays an important role in helping set initiatives and priorities for the scientific community, and in supporting the conditions that allow science to move forward in meaningful ways.”

Halas is best known for her pioneering work in nanophotonics and plasmonics. She helped develop nanoshells, or metal-coated nanoparticles that capture light energy, which have led to innovations in renewable energy, cancer therapy and water purification.

Halas co-founded Syzygy Plasmonics with frequent collaborator and fellow Rice professor Peter Nordlander. The company is developing low-cost, light-driven, all-electric chemical reactors for the sustainable production of hydrogen fuel. It was named to Fast Company's energy innovation list last year.

Syzygy Plasmonics is developing its first commercial-scale biogas-to-sustainable aviation fuel project in Uruguay, known as NovaSAF-1. It secured a six-year offtake agreement for the entire production from the project with Singapore-based commodity company Trafigura this month.

Halas was first elected to become a member of the NAS in 2013, and was shortly after named to the National Academy of Engineering in 2014—making her one of the few scientists to hold both distinctions. She received the Benjamin Franklin Medal in Chemistry last year. Many scientists who have received the award have gone on to win Nobel prizes.

She is also the co-founder of Nanospectra Biosciences and a member of the National Academy of Inventors, the American Academy of Arts and Sciences, and the Royal Danish Academy of Science and Letters. She holds more than 25 patents, according to Rice.

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