Many organic and inorganic compounds can be reduced or oxidised at electrode surfaces. The electron transfer reactions are often coupled with homogeneous chemical steps (such as proton transfers). We are interested in determining the exact order that the electron transfer and chemical steps occur, and calculating the kinetic parameters associated with the transformations (particularly for biological molecules such as vitamins and coenzymes). Sometimes the species produced during the electron transfer reactions are short-lived (such as radical anions and cations); therefore, in situ spectroscopic methods are utilised in order to identify reactive intermediates. We are also very interested in determining the effect of trace water on voltammetric mechanisms, because electrochemical experiments are often carried out in non-aqueous solvents that contain low levels of water.
The quality of the air that we breathe is critical to our health and well-being. Therefore, it is essential that the chemical composition of the atmosphere is known as closely as possible. Singapore, like many modern cities, suffers air quality problems due to extensive industry and motor vehicle traffic. South East Asia also has problems due to atmospheric haze brought about by slash-and-burn practices of farmers. We are interested in monitoring the air quality in Singapore to determine the levels of atmospheric chemicals (natural and anthropogenic). From an environmental perspective, we are also interested in using electrochemistry such as in electrolysis methods for water purification and carbon dioxide reduction, developing electrochemically charged membranes for separations, and new molecular systems for redox flow batteries.