better busses

City of Houston, METRO reveal autonomous shuttle,  zero-emission initiatives

FutureLink is part of the second phase of METRO's autonomous vehicle testing program. Photo courtesy of METRO

Houston and METRO took the latest step towards transforming the city into a leader in innovative and eco-friendly transportation.

Mayor Sylvester Turner unveiled METRO's new autonomous shuttle, FutureLink. The vehicle a fully autonomous zero-emission shuttle that can operate on city streets between Texas Southern University and METRO's Eastwood Transit Center. The level 4 zero-emission shuttle bus can seat 14 passengers and up to two wheelchairs.

FutureLink is part of the second phase of METRO's autonomous vehicle testing program.

"FutureLink represents the intersection of innovation and sustainability," says Mayor Turner in a news release. "METRO continues to pioneer change and today, we celebrate METRO's commitment to advancing our city's vision for the future in which transportation is safe, equitable, and resilient."

METRO's electric bus was also on display at the event, which is part of its fleet of zero-emission vehicles that align with the city's Climate Action Plan working towards a greener future.

"At METRO, we believe that innovation and sustainability are not just responsibilities, but opportunities to create a better tomorrow," METRO Board Chair Sanjay Ramabhadran says in a news release. "We are passionate about building a thriving, livable, and equitable future for the Houston region, and we are working hard to make it a reality for generations to come."

The project was funded by the Federal Transit Administration through its Accelerating Innovative Mobility program. Phase 2 of the pilot program is expected to run through October 2024, with a final report aiming for March 2025.

Earlier this month, the city approved funding for an EV rideshare service. The $281,000 of funding went toward the expansion of free electric vehicle rideshare services in communities that are considered underserved by utilizing services like RYDE and Evolve Houston.

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A View From HETI

Ahmad Elgazzar, Haotian Wang and Shaoyun Hao were members of a Rice University team that recently published findings on how acid bubbling can improve CO2 reduction systems. Photo courtesy Rice.

In a new study published in the journal Science, a team of Rice University researchers shared findings on how acid bubbles can improve the stability of electrochemical devices that convert carbon dioxide into useful fuels and chemicals.

The team led by Rice associate professor Hoatian Wang addressed an issue in the performance and stability of CO2 reduction systems. The gas flow channels in the systems often clog due to salt buildup, reducing efficiency and causing the devices to fail prematurely after about 80 hours of operation.

“Salt precipitation blocks CO2 transport and floods the gas diffusion electrode, which leads to performance failure,” Wang said in a news release. “This typically happens within a few hundred hours, which is far from commercial viability.”

By using an acid-humidified CO2 technique, the team was able to extend the operational life of a CO2 reduction system more than 50-fold, demonstrating more than 4,500 hours of stable operation in a scaled-up reactor.

The Rice team made a simple swap with a significant impact. Instead of using water to humidify the CO2 gas input into the reactor, the team bubbled the gas through an acid solution such as hydrochloric, formic or acetic acid. This process made more soluble salt formations that did not crystallize or block the channels.

The process has major implications for an emerging green technology known as electrochemical CO2 reduction, or CO2RR, that transforms climate-warming CO2 into products like carbon monoxide, ethylene, or alcohols. The products can be further refined into fuels or feedstocks.

“Using the traditional method of water-humidified CO2 could lead to salt formation in the cathode gas flow channels,” Shaoyun Hao, postdoctoral research associate in chemical and biomolecular engineering at Rice and co-first author, explained in the news release. “We hypothesized — and confirmed — that acid vapor could dissolve the salt and convert the low solubility KHCO3 into salt with higher solubility, thus shifting the solubility balance just enough to avoid clogging without affecting catalyst performance.”

The Rice team believes the work can lead to more scalable CO2 electrolyzers, which is vital if the technology is to be deployed at industrial scales as part of carbon capture and utilization strategies. Since the approach itself is relatively simple, it could lead to a more cost-effective and efficient solution. It also worked well with multiple catalyst types, including zinc oxide, copper oxide and bismuth oxide, which are allo used to target different CO2RR products.

“Our method addresses a long-standing obstacle with a low-cost, easily implementable solution,” Ahmad Elgazzar, co-first author and graduate student in chemical and biomolecular engineering at Rice, added in the release. “It’s a step toward making carbon utilization technologies more commercially viable and more sustainable.”

A team led by Wang and in collaboration with researchers from the University of Houston also shared findings on salt precipitation buildup and CO2RR in a recent edition of the journal Nature Energy. Read more here.

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