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An international research team has uncovered a class of previously unknown “hidden materials” by tracking the elusive, split-second changes that occur as molecules decompose under heat. Typically, when materials scientists create solid compounds through thermal processing, attention is paid almost entirely to the final outcome – which is essentially moving straight from starting material “A” to end product “B. But this study shows that there are many fascinating stages in between ‘A’ and ‘B,’ and these hidden steps could be just as important,” said Dr. The team began their experiments using customised “single-source precursors” – single molecules engineered to contain every fundamental element required to yield a targeted solid material. Standard bismuth vanadate has been prized in renewable energy engineering due to its optimal “band gap” – the exact energy threshold needed to absorb sunlight and catalyze chemical reactions.
The findings, published in Nature Communications, may unlock new pathways to develop more efficient solar fuel systems and higher-capacity batteries. However, by freezing and analysing the fleeting intermediate phases that arise during the heating cycle, researchers discovered entirely new structures that are difficult or impossible to manufacture using standard synthesis methods. “When materials are made by heating, scientists usually focus on the final product, the ‘B’ that results from ‘A. Sebastian Pike from the Department of Chemistry at the University of Warwick. “We didn’t know exactly what we would find going in, but we were confident there would be something interesting and unknown in the intermediate phases. We were thrilled to discover that some of these could have practical uses, even from the very first experiments,” Pike added. As temperatures steadily rose, the scientists monitored how the molecular bonds broke apart and reassembled. This tracking exposed several uncharted material phases, most notably a newly discovered, kinetically stabilized form of bismuth vanadate. This characteristic allows it to harvest solar energy efficiently while providing the required chemical punch to split water molecules into clean hydrogen fuel. Crucially, it possesses a significantly wider band gap, fundamentally changing how the material absorbs and reacts to light. Researchers note that this shift introduces fresh avenues to fine-tune materials across catalysis, advanced electronics, and solar fuel generation. The utility of these intermediate materials extends beyond solar energy. During the testing process, the scientists isolated another transient phase exhibiting high-capacity lithium storage, suggesting immediate promise for next-generation battery architectures.
The newly identified ‘form’ features a distinct atomic architecture that sets it apart from all previously cataloged variations of the compound.
“What’s exciting is that these ‘in-between’ materials aren’t just stepping stones — they can have useful properties in their own right,” explained Dr. Dominik Kubicki from the School of Chemistry at the University of Birmingham. “By understanding and controlling how they form, we can start to design better materials for batteries, catalysis, and solar energy. You use AI every day. Now get your AI Quotient. Take the AIQ test.