Promoting CO2 electroreduction on boron-doped diamond electrodes: Challenges and trends

CO 2 electroreduction (eCO 2 R) into fuel products is a promising technology to mitigate the effects of greenhouse gas emissions and store renewable energy. The main metal-based electrocatalysts widely employed in CO 2 reduction are characterized by high overpotentials, low stability, and unsatisfactory selectivity. As a result, a growing interest in the use of boron-doped diamond (BDD)-based electrocatalysts have been observed due to its excellent properties. This review sheds light on the techniques applied toward the eCO 2 R on BDD surface and the effects of the operational conditions. Particular emphasis will be given on recent advances made in the quest for enhancing the performance of BDD in eCO 2 R through its modification with defects insertion or functionalization with metal-based materials. The review will also present a brief overview of the challenges and directions of future research with respect to the development of different electrochemical systems for eCO 2 R on BDD electrodes. • General overview and perspectives on CO 2 electroreduction on BDD electrodes. • Recent developments in the use of modified diamond electrodes for CO 2 electroreduction. • Challenges in the design of flow reactors for industrial application. • New directions for the use of integrated techniques for CO 2 electroreduction.