Dr. Miller is interested in the structure-function relationships that govern the selective transport of small solutes—including water, gases, ions, and small-molecule organics—through polymeric membranes and other separation media. These relationships can become very complex in solute mixtures, where solute-solute interactions and solute-polymer interactions can affect membrane selectivity. Particularly interesting is the selective transport of solutes across the interface between an external solution phase and the solid membrane phase. Dr. Miller’s research in LiSA focuses on the synthesis and characterization of polymer electrolytes for photoelectrochemical carbon dioxide reduction cells. These polymer electrolytes are responsible for controlling the transport of water, mobile ions, reactants, and products to and from the catalytic sites. Dr. Miller seeks to understand how these polymer electrolytes may impact catalyst selectivity and efficiency. Polymer chemistry and morphological characteristics are tuned to develop an understanding of how they impact transport in the catalytic microenvironment and, in turn, bear on the catalytic mechanisms of carbon dioxide reduction to liquid fuels.