Negative emissions technologies have been developed to remove previously emitted carbon dioxide (CO2) from the atmosphere. Electrochemical ocean alkalinity enhancement has emerged as a promising approach because it can simultaneously reduce atmospheric CO2 concentrations and mitigate ocean acidification; however, its scalability is currently constrained by high levelized costs per tonne of CO2 removed and the generation of a dilute hydrochloric acid (HCl) waste stream which has no market viability and must be managed to prevent its release back into the ocean. This thesis investigates the valorization of the dilute HCl stream using bipolar membrane water electrolysis to generate hydrogen gas as a valuable co-product. Specifically, the feasibility of employing a dilute HCl cathode feed with a platinum nanoparticle carbon-supported (Pt/C) catalyst in a BPMWE is evaluated. The Pt/C catalyst demonstrates stability in 0.1 M to 1 M HCl, exhibiting only 0.79 wt% platinum dissolution after 24 hours of operation at −0.3 V vs the reversible hydrogen electrode (RHE) in 1 M HCl. Performance testing of BPMWE systems reveals that operating with a dilute HCl cathode feed and ultrapure deionized water anode feed results in significant free chlorine generation, accompanied by an unstable voltage when operated at 250 mA/cm2. In contrast, replacing the anode feed with 0.1 M NaOH eliminates detectable free chlorine formation and stabilizes system performance, maintaining an average cell voltage of 3.3 ± 0.1 V over 120 hours of continuous operation at 250 mA/cm2. Overall, this work demonstrates the viability of Pt/C catalysts in acidic chloride environments within BPMWE and identifies chlorine formation as a key operational limitation.