Rehydrogenation of Sodium Borates to Close the NaBH 4 -H 2 Cycle: A Review

Helder X. Nunes, Diogo L. Silva, Carmen M. Rangel and Alexandra M. F. R. Pinto
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Helder X. Nunes: Transport Phenomena Research Center, Chemical Engineering Department, Faculty of Engineering, University of Porto, Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
Diogo L. Silva: Transport Phenomena Research Center, Chemical Engineering Department, Faculty of Engineering, University of Porto, Dr. Roberto Frias s/n, 4200-465 Porto, Portugal
Carmen M. Rangel: National Laboratory of Energy and Geology, Estrada da Portela, 1649-038 Lisboa, Portugal
Alexandra M. F. R. Pinto: Transport Phenomena Research Center, Chemical Engineering Department, Faculty of Engineering, University of Porto, Dr. Roberto Frias s/n, 4200-465 Porto, Portugal

Energies, 2021, vol. 14, issue 12, 1-28

Abstract: In 2007, the US Department of Energy recommended a no-go on NaBH 4 hydrolysis for onboard applications; however, the concept of a NaBH 4 -H 2 -PEMFC system has the potential to become a primary source for on-demand power supply. Despite the many efforts to study this technology, most of the published papers focus on catalytic performance. Nevertheless, the development of a practical reaction system to close the NaBH 4 -H 2 cycle remains a critical issue. Therefore, this work provides an overview of the research progress on the solutions for the by-product rehydrogenation leading to the regeneration of NaBH 4 with economic potential. It is the first to compare and analyze the main types of processes to regenerate NaBH 4 : thermo-, mechano-, and electrochemical. Moreover, it considers the report by Demirci et al. on the main by-product of sodium borohydride hydrolysis. The published literature already reported efficient NaBH 4 regeneration; however, the processes still need more improvements. Moreover, it is noteworthy that a transition to clean methods, through the years, was observed.

Keywords: hydrogen; sodium borohydride; regeneration of sodium borohydride; thermochemical processes; mechano-chemical processes; electrochemical processes; hydrogen cycle (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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