Interfacial Electrochemistry and Electrocatalysis: Understanding and Directing Electrochemical Phenomena at the Molecular Level

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Our research program in interfacial electrochemistry and electrocatalysis consist of four innovative and inter-related thrusts that will be pursued at the same time with the objective of gaining molecular-level understanding of electrochemical phenomena. We will study the origin of electrocatalytic activity of Pt and will identify key characteristics that will be used to develop a set of guidelines for the synthesis of non-Pt electrocatalysts possessing similar electrocatalytic properties. This will be achieved through detailed experimental research, which will include the development of variable-temperature electrochemical quartz-crystal nanobalance. We will investigate size-dependent phenomena in electrocatalysis by studying the electro-adsorption of H on spherical Pt nanoparticles having well-tailored dimensions and determine the critical dimension at which the size of nanoparticles begins to affect the H electro-adsorption giving rise to a unique interfacial behavior. We will carry out meticulous investigation of the electro-oxidation and electro-dissolution of Pt(hkl) electrodes with the objective of discovering effects that are specific to the surface geometry. Because Pt nanoparticles used in polymer electrolyte membrane fuel cells contain mainly (111) and (100) facets plus edges and corners, this research will contribute to the understanding of their degradation. We will also study the impact of temperature on the formation of metallic layers that are sub-nm in thickness, possess a tailored chemical composition and fine-tuned adhesion to the substrate; we will assess the influence of temperature variation on their physical properties. The research program comprising four themes creates an opportunity for a breakthrough, if not for a discovery. It is ambitious and challenging, but our ability to successfully undertake difficult projects and our past achievements prove that the proposed research can be realized with well-trained HQP. Though the research is basic in nature, it will benefit electrochemical technologies by creating new knowledge. Finally, six HQP will be trained in modern electrochemistry and electrocatalysis, and will develop a unique set of inter-disciplinary skills, which will enhance their future careers.