Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
The development of efficient solar to fuel devices will require electrocatalyst and photoelectrode materials to operate in common electrochemical environment. However, the optimal environment for the oxidation and reduction reactions are typically not the same, and thus significant challenges remain to find an efficient and stable overall water splitting and CO2 reduction systems. This talk will demonstrate the importance that the electrolyte pH can play in the activation and performance of electrocatalyst and photoelectrode materials. In addition, the opportunities of using a bipolar membrane to separate anode and cathode compartments to separately optimize both reaction conditions will be discussed with regard to photoelectrochemical and electrochemical devices for highly efficient and stable solar driven water splitting and electrochemical CO2 conversion. In particular, having an alkaline oxidation half-cell combined to a neutral CO2 reduction half-cell with this bipolar membrane allows the ability to decrease the operating potential by more than 1 V, improve stability, and for the first time utilize a non-precious metal anode. The implications of this system will be discussed along with detailed analysis on the thermodynamic, kinetic, and electrochemical parameters that are affected by selective catalyst/electrolyte coupling.