The Berben group is investigating the behavior of low-valent metal-metal bonded copper clusters as soluble models for the reduction of CO2 by heterogeneous Cu-containing catalysts. To achieve this goal we are using electrochemical techniques including cyclic voltammetry to interrogate both solution dissolved species and single-site Cu and Cu-Cu bonded molecular species as supported molecular catalysts. The insights we gain by studying reaction intermediates and products are guiding future model design and future catalyst development for CO2 reduction.