arts meets energy transition

Sustainable sculpture to power Houston multicultural arts building

The City of Houston is aiming to have Arco del Tiempo installed in 2024. Photo courtesy of The City of Houston

The City of Houston has unveiled the first look at the latest permanent public artwork that will be installed in the Second Ward in 2024. The sculpture is the first-ever environmentally sustainable art piece that will generate electricity for the nearby City-owned Latino multicultural performing arts theater.

Arco del Tiempo (Arch of Time) is a 100-foot tall arch designed by Berlin-based artist and architect Riccardo Mariano. Several years have been put into the making of this project, dating as far back as 2019. Mariano had entered the idea into a Land Art Generator Initiative (LAGI) design competition in the Houston sister-city of Abu Dhabi. From there, it was chosen to be developed full-scale and installed at Guadalupe Plaza Park.

According to a press release, the sculpture can measure time and cast beams of sunlight onto the ground, creating a connection between "the celestial and the terrestrial" through the geometry of the design.

The light beams are different based on the four seasons and the time of day, constantly shifting and responding to the latitude and longitude of the city from space. Mariano said that his sculpture is a "practical example" of how physical art can interact with the abstract, such as the Earth's movement around the sun.

"The apparent movement of the sun in the sky activates the space with light and colors and engages viewers who participate in the creation of the work by their presence," said Mariano. "Arco del Tiempo merges renewable energy generation with public space and into the everyday life of the Second Ward. Inspired by science and powered by renewable energy, the artwork is a bridge between art and technology and encourages educational purposes while improving public space. At night the space within the arch will be used as a stage for outdoor public events.”

"At night the space within the arch will be used as a stage for outdoor public events,” Riccardo Mariano said.Photo courtesy of The City of Houston

Arco del Tiempo will do more than just be an aesthetically pleasing sight for the community. Its meaningful, functional purpose will be to generate about 400,000 kilowatt-hours of electricity per year, and power the Talento Bilingüe de Houston. LAGI founding co-director Elizabeth Monoian said in the release the sculpture will generate over 12 million kilowatt-hours of power throughout its lifetime, which equals the removal of 8,500 metric tons of carbon dioxide from the atmosphere.

"Through the clean energy it produces, Arco del Tiempo will pay back its embodied carbon footprint," Monoian said. "In other words, all the energy that went into its making—from the smelting of the steel to the drilling that puts the final cladding into place—will be offset through the energy it generates. Beyond its break-even point, which we will track and celebrate with the community, the artwork will be a net-positive contributor to a healthy climate and the planet will be better off for its existence.”

In a statement, Houston Mayor Sylvester Turner praised the unique art piece as more than just a sculpture, but as a "monument to a new era of energy."

"The City of Houston has always stood at the vanguard of energy innovation and the Arco del Tiempo artwork stands in that tradition, highlighting Houston’s role as an art city and as global leader in the energy transition," Mayor Turner said. "We are inspired by the vision and creative thinking. Marrying clean energy, the built environment, and truly World Class art is Houston.”

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This article originally ran on CultureMap.

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A View From HETI

Rice University scientists' “recharge-to-recycle” reactor has major implications for the electric vehicle sector. Photo courtesy Jorge Vidal/Rice University.

Engineers at Rice University have developed a cleaner, innovative process to turn end-of-life lithium-ion battery waste into new lithium feedstock.

The findings, recently published in the journal Joule, demonstrate how the team’s new “recharge-to-recycle” reactor recharges the battery’s waste cathode materials to coax out lithium ions into water. The team was then able to form high-purity lithium hydroxide, which was clean enough to feed directly back into battery manufacturing.

The study has major implications for the electric vehicle sector, which significantly contributes to the waste stream from end-of-life battery packs. Additionally, lithium tends to be expensive to mine and refine, and current recycling methods are energy- and chemical-intensive.

“Directly producing high-purity lithium hydroxide shortens the path back into new batteries,” Haotian Wang, associate professor of chemical and biomolecular engineering, co-corresponding author of the study and co-founder of Solidec, said in a news release. “That means fewer processing steps, lower waste and a more resilient supply chain.”

Sibani Lisa Biswal, chair of Rice’s Department of Chemical and Biomolecular Engineering and the William M. McCardell Professor in Chemical Engineering, also served as co-corresponding author on the study.

“We asked a basic question: If charging a battery pulls lithium out of a cathode, why not use that same reaction to recycle?” Biswal added in the release. “By pairing that chemistry with a compact electrochemical reactor, we can separate lithium cleanly and produce the exact salt manufacturers want.”

The new process also showed scalability, according to Rice. The engineers scaled the device to 20 square centimeters, then ran a 1,000-hour stability test and processed 57 grams of industrial black mass supplied by industry partner Houston-based TotalEnergies. The results produced lithium hydroxide that was more than 99 percent pure. It also maintained an average lithium recovery rate of nearly 90 percent over the 1,000-hour test, showing its durability. The process also worked across multiple battery chemistries, including lithium iron phosphate, lithium manganese oxide and nickel-manganese-cobalt variants.

Looking ahead, the team plans to scale the process and consider ways it can sustain high efficiency for greater lithium hydroxide concentrations.

“We’ve made lithium extraction cleaner and simpler,” Biswal added in the release. “Now we see the next bottleneck clearly. Tackle concentration, and you unlock even better sustainability.

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