Direct manipulation of charge accumulation on catalytic active sites represents an effective strategy for controlling molecular interactions at catalytic sites, thereby facilitating catalytic reactions with enhanced activity and selectivity. Charge modulation can be achieved using catalytic condensers that consist of thin dielectric films, where catalytic components such as platinum clusters are coated. In this work, we have developed the catalytic condenser with unique oxide thin dielectric film, where tiny platinum cluster-supported single layer graphene was put on for the catalytic active sites with conductivity. To achieve maximal charge accumulation in the catalytic condenser, devices were fabricated with various architectures that achieved variable stability under varying applied potential. Devices were analyzed by spectroscopy to understand the relationship between synthetic methods and resulting device structure and composition along with the resulting electronic and chemical properties. Dynamic carbon monoxide sorption studies using in-situ Fourier Transform Infrared spectroscopy revealed that charge accumulation, under applied voltage on the catalytic condenser, effectively modulates the binding energy of CO on the Pt surface.
