At Lehigh University in Bethlehem, Steven McIntosh and his team have cracked open a chemical puzzle that could remake how everyday products are manufactured. The shampoo bottles, food containers, and kitchen spatulas lining store shelves today are built from molecules derived almost entirely from oil—but McIntosh's discovery suggests a future where those same products come instead from plants and algae, and without sacrificing efficiency in the process.
This shift matters far beyond the laboratory. Moving from fossil-fuel-based chemical feedstocks to renewable biological sources touches on health, economic resilience, and national security. Yet the pathways for transforming these plant-sourced molecules into the industrial platform chemicals that manufacturers depend on have remained largely opaque. McIntosh, the Zisman Family Professor and Chair of the Department of Chemical and Biomolecular Engineering at Lehigh, and his collaborators—including Ph.D. student Bohyeon Kim and researchers from Cardiff University in Wales—have now illuminated a mechanism that could make these transformations not just possible but practical at industrial scale.
The breakthrough centers on an unexpected relationship between two metals: gold and palladium. When used as catalyst particles, these metals couple through an electrochemical mechanism, fundamentally altering how chemical reactions proceed. In conventional catalysis, both oxidation and reduction—the two halves of every chemical reaction—happen simultaneously on a single particle. McIntosh's team separated these reactions, forcing oxidation to occur on one metal and reduction on the other. The result is a nanoscale electrochemical reactor that increases reactivity so more molecules transform per second at a given temperature, without requiring additional energy or expensive catalysts.
But the innovation runs deeper still. Palladium normally dissolves under the high-heat, high-pressure conditions required for scaling up chemical manufacturing. In the presence of gold, however, it remains metallic and stable. This electrochemical crosstalk between the metals doesn't just boost reaction rates—it enables the catalysts to operate under conditions previously thought impossible. "Through this electrochemical crosstalk between the metals, we're not only increasing reaction rates, but also stabilizing the system," McIntosh explains. "That allows the catalysts to operate under conditions they normally couldn't, and it's the first time this has been shown."
The discovery took another surprising turn when the team examined what happens under highly alkaline conditions. Rather than simply losing stability, the palladium enters a cycle, alternating between dissolved and metallic states. Rather than a failure, this became an asset: McIntosh realized they had stumbled upon an entirely new reaction mechanism, never before documented, where the palladium's transformation becomes part of the chemical process itself.
Published in Nature Catalysis, this work opens a wider horizon than any single industrial application. It suggests that even long-studied catalytic systems may behave in fundamentally different ways than anyone previously understood. For researchers designing chemical processes, it offers a new framework for thinking about reactions and a richer toolkit for innovation. The path from bio-sourced molecules like plants and algae to the platform chemicals that industry requires remains complex, but McIntosh's team has revealed that those pathways hold untapped potential—and that the future of manufacturing may come not from innovation alone, but from learning to see chemistry's hidden architecture.