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

Autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING; v. 12, n. 6, p. 10-pg., 2024-11-23.

Resumo

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)

• Processo FAPESP: 19/13113-4 - Processos foto (eletro) catalíticos e fotoeletro-fenton para eliminar contaminantes emergentes de águas de rejeito industriais
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 14/50945-4 - INCT 2014: Instituto Nacional de Tecnologias Alternativas para Detecção, Avaliação Toxicológica e Remoção de Micropoluentes e Radioativos
• Beneficiário: Maria Valnice Boldrin
• Modalidade de apoio: Auxílio à Pesquisa - Temático