Energy-saving electrochemical green hydrogen production coupled with persulfate or hydrogen peroxide valorization at boron-doped diamond electrodes

Author(s)

Barreto, Jessica Pires de Paiva ; Santos, Jose Eudes Lima ; Cardozo, Jussara Camara ; Souza, Domingos Fabiano de Santana ; Cavalcanti, Livia N. ; Gondim, Amanda D. ; Martinez-Huitle, Carlos A. ; dos Santos, Elisama Vieira

• Document type: Journal article
• Source: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 12, n. 6, p. 10-pg., 2024-11-23.

Abstract

Persulfate (S2O82-) and hydrogen (H-2) electrosynthesis has gained prominence valorization in recent times. This study reports, for the first time, a techno-economic analysis of the electrochemical boron-doped diamond (BDD)-SO42-/SO4 center dot-/S2O82-/H2O2||H-2 system. BDD is an eco-friendly material for S2O82- and H-2 formation, where S2O82- is economically attractive replacements for oxygen reaction in electrochemical H-2 production to valorize it as an integrated-hybrid approach. The results clearly showed that current efficiencies of up to 75.3 % and 99.4 % at 45 mA cm(-2) were observed for S2O82- and H-2 production with anodic accumulation of 1.77 mmol L-1 and cathodic rate 0.3 mu mol min(-1), respectively. A techno-economic estimation indicated a significant levelized cost of H-2 (similar to$ 3.78 kg(-1)) for this hybrid-integrated process where it was improved decreasing the anode cost or increasing the current density (j). BDD||Ni-Fe based stainless-steel (SS) mesh system could be more appropriate to be commercialized for producing persulfate and green H-2, according to the techno-economic analysis. This electrochemical strategy described here is a promising green alternative to conventional processes for the simultaneous electrogeneration of oxidants and green H-2, both as high value-added products. (AU)

• FAPESP's process: 19/13113-4 - Photo (electro) catalysis and photoelectro-fenton processes for emerging contaminants removal from industrial wastewater
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Regular Research Grants
• FAPESP's process: 14/50945-4 - INCT 2014: National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactivies
• Grantee: Maria Valnice Boldrin
• Support Opportunities: Research Projects - Thematic Grants