Heterogeneous catalysis in the chemical industry primarily occurs at solid-gas interfaces. However, there are crucial catalytic reactions at metal-solution interfaces, such as the thermocatalytic formic acid dehydrogenation (FAD) on a metallic catalyst, that play a significant role in hydrogen production and storage. Formic acid's properties make it an excellent hydrogen energy carrier due to its high volumetric capacity and low toxicity. Research on FAD mechanisms at metal-solution interfaces is limited compared to metal-gas interfaces. The study aims to address this gap by utilizing interfacial electrochemistry to dissect FAD into formic acid oxidation reaction (FAOR) and hydrogen evolution reaction (HER), providing insights into the kinetics. By determining the rate-determining steps for FAOR, HER, and FAD in various solutions and evaluating energy barriers through quantum mechanics calculations, the research aims to enhance the understanding of FAD kinetics. The impact of the electrical double layer structure on FAD kinetics is also under investigation. Overall, the study's results are projected to facilitate the design of more efficient FAD systems for hydrogen production.