Carlos Araque, CEO of Quaise Energy, has labeled this advancement as nothing less than the first significant innovation in drilling in the past century. This bold assertion reflects the company’s broader vision to harness superhot, superdeep geothermal resources beneath our feet, thus positioning geothermal energy on par with traditional fossil fuels in terms of accessibility and utility. The energy from these geothermal sources has the potential not only to power homes but also to significantly reduce the carbon footprint associated with conventional energy production.

During the demonstration, a group of around 56 observers endured the harsh Texas weather, with temperatures soaring to 99 degrees Fahrenheit, to witness this radical drilling technique in action. The event was not merely an observational opportunity; it was an interactive experience with real-time data readily displayed on a flat-screen TV. Attendees were treated to a firsthand look at the drilling process, which included live video footage of the depth being achieved as well as an informative tour of various operational stations related to the drilling effort.

Steve Jeske, a project manager at Quaise, emceed the event and skillfully conveyed the nuances of the drilling process to the audience. He humorously noted that “drilling, when it’s done well, is very boring,” emphasizing the safety and reliability that comes with effective drilling procedures in the geothermal context. Jeske’s comments offered insight into the operational ethos of Quaise, which is committed to both innovation and safety in equal measure.

The tour included four key stations, each a testament to the technological marvels underpinning the demonstration. Attendees explored the drilling rig, reminiscent of a compact derrick, and witnessed the gyrotron’s operation. This sophisticated piece of equipment generates highly focused energy waves necessary for the drilling process. Observing the driller’s cabin, or doghouse, attendees gained a deeper understanding of how the small crew orchestrates various aspects of the drilling operation.

At the demonstration’s culmination, participants peered down a record-setting hole that Quaise drilled in July, reaching an unprecedented depth of 118 meters. A live camera provided a glimpse of this hole, revealing the striking transition from surface soil to solid granite. The technology employed is capable of ablating the pink granite into fine ash, a process that aligns with the company’s mission to revolutionize geothermal access through advanced drilling methods.

In a video released coinciding with the September 4 event, Matt Houde, co-founder and Chief of Staff at Quaise, articulated a compelling vision, stating, “At Quaise, we’re rapidly moving from microwaves in the ground to megawatts on the grid.” This statement encapsulates the urgency and ambition driving the company’s endeavors. Araque reinforced their mission by asserting that Quaise is not merely a drilling enterprise but an energy company committed to positioning geothermal energy as a leading force in the global energy transition.

The journey leading to the Marble Falls demonstration reflects a series of progressively challenging trials aimed at perfecting this pioneering technology. In the preceding months, the Quaise team undertook a sequence of successful drilling attempts—starting with shallow explorations and culminating in their deep-crust endeavors. Each stage was characterized by meticulous planning and execution, allowing them to refine the technology and adapt to various geological conditions.

As reported by Justin Lamb, who leads field operations at Quaise, the team’s successful penetration of granite skin during the July demonstration was pivotal. This was their first real-world application of the technology outside experimental settings, and it yielded promising results, including a remarkable drilling rate of up to five meters per hour through challenging rock types, which is astonishing compared to the industry standard of only a tenth of a meter per hour.

Henry Phan, Vice President of Engineering at Quaise, pointed out that their ambitious goal is a continuous rate of drilling regardless of rock composition or depth. Currently, they’ve achieved a four-inch diameter hole, but the production target is significantly larger at eight and a half inches. This leap would enable more efficient integration of the drilled geothermal resources into the existing energy grids.

The Marble Falls site functions as a critical testing ground, validating the models developed by Quaise engineers over several years of research. Emilie Williams, Test Group Manager at Quaise, enthusiastically remarked that the data collected from this demonstration closely aligns with prior simulations, affirming the technology’s potential to revolutionize geothermal energy extraction.

Looking ahead, Quaise Energy is not resting on its laurels. Plans are in place to deepen their record hole to one kilometer, a milestone they hope to achieve in the coming months. In their pursuit of innovation, the team is conducting additional tests intended to optimize various drilling parameters. Key areas of focus include improving the straightness of the drilled hole and accelerating the overall drilling speed, which are essential for maximizing efficiency and effectiveness in challenging geological environments.

The excitement surrounding Quaise Energy’s advancements is taking shape in the form of six upcoming public demonstrations at the Marble Falls quarry, which the company intends to showcase over the next three months. These events provide an opportunity for the public to engage with this groundbreaking technology firsthand. For those interested in attending, Quaise has opened channels for interested parties to participate, further amplifying community engagement in renewable energy discourse.

Quaise’s journey represents a beacon of hope for the future of clean energy. The ambition and innovation they embody highlight the pressing need for effective solutions in tackling the global energy crisis. As Araque reflects on his initial exposure to the underlying MIT technology that sparked Quaise Energy’s inception, he acknowledges the myriad variables that could potentially challenge the venture yet remains steadfastly confident in their mission. The emerging potential to unlock vast geothermal energy reservoirs may redefine not only energy sourcing but also contribute significantly to reducing the global reliance on fossil fuels, paving the way for a sustainable energy future.

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Recent research by Zhang, Raciti, and Hall, published in Nature Chemistry, reveals a fascinating breakthrough in this domain. Their study highlights that the local water environment at the electrode interface—not just the catalyst itself—plays a critical role in dictating the reaction pathway and outcome in CO electroreduction. By tuning the structure of interfacial water using highly concentrated sodium perchlorate (NaClO₄) electrolytes, the authors demonstrate a remarkable enhancement in the rate and selectivity of CO conversion to ethylene (C₂H₄), a high-value, two-carbon product.

One of the intriguing observations in this work is the dramatic increase in CO reduction activity when the NaClO₄ concentration is ramped up from a dilute 0.01 molal to a highly concentrated 10 molal solution. This adjustment yielded an 18-fold increase in the rate of CO electroreduction and pushed the Faradaic efficiency for multi-carbon products to an impressive 91% at a potential of −1.43 V versus the normal hydrogen electrode (NHE). These electrochemical parameters underscore the profound impact that electrolyte concentration exerts, making the electrolyte itself a powerful lever to control catalysis.

To unravel the underlying mechanisms behind this phenomenon, the researchers employed temperature-dependent electrochemical measurements alongside surface-enhanced Raman spectroscopy (SERS). This dual approach enabled a nuanced interrogation of both kinetics and molecular-scale interactions at the catalytic interface. Temperature variation allowed the team to extract apparent activation enthalpy and entropy values associated with CO reduction to C₂H₄, offering thermodynamic insights into the reaction’s energetic landscape.

The spectroscopic data yielded particularly compelling clues. As ionic strength increased with rising NaClO₄ concentration, the interfacial water exhibited significant structural changes. Notably, the SERS signatures revealed emerging modes associated with non-hydrogen-bonded water molecules, indicative of a disrupted hydrogen bonding network. This disruption led to a more disordered and dynamic interfacial water layer—that is, an environment markedly different from the highly structured hydrogen-bonded ice-like layers typically observed at lower ionic strengths.

These changes in interfacial water structure were reflected in the apparent activation parameters of the CO reduction reaction. At elevated ionic strengths, the apparent activation entropy increased, suggesting that the reaction proceeding through a more disordered transition state encounters a more favorable entropic landscape. This means that a less rigid hydration shell around reacting species lowers the barrier for C–C coupling events, facilitating ethylene formation more efficiently.

This study not only underscores the vital role of interfacial water in electrocatalysis but also opens new avenues to actively design electrolyte conditions to influence reaction pathways. By moving beyond the conventional focus on catalyst materials and morphologies, this research pivots toward the often overlooked, yet equally crucial, role of the electrolyte’s molecular environment. Such a paradigm shift could unlock simpler, more robust strategies to achieve higher selectivities and rates in electrochemical CO and CO₂ conversion.

Understanding water’s behavior at electrode surfaces has historically posed immense challenges, owing to its dynamic hydrogen bonding and sensitivity to subtle environmental changes. The employment of concentrated NaClO₄ solutions as a tool to manipulate water structure provides a novel experimental platform for controlling these interactions. It allows the decoupling of ion-specific effects from water structuring influences, revealing interfacial entropy as a critical thermodynamic parameter for selective catalysis.

Furthermore, these findings hold significance for the broader field of electrochemical energy conversion beyond CO reduction. Interfacial solvent effects are fundamental in various processes, from hydrogen evolution to oxygen reduction and nitrogen fixation. Insights gleaned here could inspire targeted electrolyte engineering to optimize other complex, multi-electron transformations critical for sustainable chemical synthesis.

Intriguingly, the 91% Faradaic efficiency for multi-carbon products achieved here rivals or exceeds many catalytic benchmark systems, suggesting that interfacial water disorder might be as important as—or even more important than—the catalyst composition itself. The ability to reliably trigger and maintain such disorder at electrode interfaces under reaction conditions could become a cornerstone technique in the design of next-generation electrochemical cells.

Moreover, the pronounced effects observed at 10 molal electrolyte concentration emphasize the often overlooked significance of ionic strength in electrocatalytic performance. High ionic strength can alter not only interfacial water but also electric double-layer structures, local pH values, and ion adsorption dynamics. Each of these factors potentially contributes to the altered reaction kinetics and thermodynamics documented in this work. Teasing apart their relative importance remains a promising direction for future studies.

The utility of surface-enhanced Raman spectroscopy in capturing non-hydrogen-bonded water modes opens new vistas for operando characterization techniques. It allows researchers to visually correlate molecular-scale water structuring with catalytic behaviors in real time, providing a powerful feedback loop for catalyst and electrolyte design. Such in situ diagnostics are critical for deciphering the complex reaction landscapes of multi-electron, multi-step transformations like CO reduction.

This research thus exemplifies how a deeper molecular understanding—here of the solvent environment—can translate into practical improvements in electrocatalysis. It challenges the traditional paradigm that focuses predominantly on solid catalyst surfaces, expanding the focus to the triple phase boundary where reactants, catalyst, and solvent converge. This holistic picture is vital for developing truly efficient and selective electrochemical technologies.

In conclusion, the work by Zhang and colleagues provides compelling evidence that disordered interfacial water layers, driven by high electrolyte ionic strength, significantly enhance CO electroreduction to ethylene by facilitating C–C bond coupling. This novel insight into the interplay between water structure and reaction thermodynamics sets the stage for innovative electrolyte engineering approaches in sustainable fuel synthesis. As the scientific community races to develop viable carbon-neutral technologies, such fundamental advances in understanding interfacial phenomena will be indispensable.

The implications of this study ripple across fields of catalysis, electrochemistry, and environmental science, offering a clear message: the properties of interfacial water—a ubiquitous yet elusive component in electrochemical systems—hold untapped potential to transform the efficiency and selectivity of carbon-based chemical transformations. Embracing this principle may unlock new pathways to mitigating climate change while advancing green chemical manufacturing at scale.

Subject of Research: Electrochemical CO reduction to multi-carbon products enhanced by tuning interfacial water structure using concentrated NaClO₄ electrolytes.

Article Title: Disordered interfacial H₂O promotes electrochemical C–C coupling.

Article References:
Zhang, H., Raciti, D. & Hall, A.S. Disordered interfacial H₂O promotes electrochemical C–C coupling. Nat. Chem. 17, 1161–1168 (2025). https://doi.org/10.1038/s41557-025-01859-z

Image Credits: AI Generated

DOI: https://doi.org/10.1038/s41557-025-01859-z