Pushing the boundaries of renewable energy technology, MIT scientists spearhead a breakthrough in understanding the subtleties of a critical chemical reaction. At the helm of this study stands Professor Yogesh Surendranath, who with his team has detailed the proton-coupled electron transfer at electrode surfaces.
The MIT chemists discovered how fluctuating pH levels alter the rate of proton motion and electron flow, and whilst the findings from their Nature Chemistry-published paper lay the groundwork for potential leaps in energy devices, it showcases how extreme pH conditions significantly impact these rates leading to faster transfers at pH 0 than at pH 14.
The research, according to MIT News, entailed designing electrodes with uniform binding sites to gain precise control over the reaction - a move divergent from the heterogeneity of conventional electrodes.
In an unexpected twist, the MIT team's model revealed that the balance point for the two reactions isn't at the assumed neutral pH of 7 but at a more alkaline pH of 10, Surendranath pointed out that "That's the default assumption, that the forward and reverse reactions contribute equally to the reaction rate" highlighting the need to reassess existing models which could challenge long-held scientific norms; despite the charges reaction rates still find a parity not in neutral grounds but skewed towards the alkaline.
Led by graduate student Noah Lewis, the research illuminates the way forward not only for hydrogen fuel production but also for carbon dioxide reduction processes. The U.S. Department of Energy Office of Basic Energy Sciences funded this innovative endeavor.
