Nanostructured TiO2‐Based Hydrogen Evolution Reaction (HER) Electrocatalysts: A Preliminary Feasibility Study in Electrodialytic Remediation with Hydrogen Recovery

Antonio Rubino, Joana Almeida, Catia Magro, Pier G. Schiavi, Paula Guedes, Nazare Couto, Eduardo P. Mateus, Pietro Altimari, Maria L. Astolfi, Robertino Zanoni, Alexandra B. Ribeiro, Francesca Pagnanelli

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

The use of electrodialytic (ED) technology in soil remediation is to date primarily limited by energy costs related to the stirring and the potentiostat power supply. Considering that during ED process water splitting reactions are the main electrodic reactions involved, one of the strategies to minimize ED energy costs is based on the by‐produced hydrogen recovery and reuse (as energy vector) in tandem connected power production units (e.g. fuel cells). From this perspective, using effective electrocatalysts would further boost energy savings by minimizing overpotentials required to sustain the electrolysis.

To this purpose, the present study investigated the possibility of employing non‐noble‐metal‐based electrodes as effective hydrogen evolution reaction (HER) electrocatalysts. Specifically, TiO2 nanotubes (NTs) based electrodes have been synthesized and characterized in comparison with commercial electrodes generally employed in ED processes (i.e. Ti/MMO (mixed metals oxides) electrodes). The preliminary characterization evidenced as greater hydrogen production has been achieved using TiO2 NTs based electrode (as cathodes) rather than the commercial one. Furthermore, considering the remediation/recovery targets of the ED tests performed, employing the TiO2 NTs based electrode higher extraction yields for W and Sn were observed, while comparable yields with the commercial electrode were observed for As and Cu.
Original languageEnglish
Title of host publicationElectrokinetic Remediation for Environmental Security and Sustainability
EditorsAlexandra B. Ribeiro, Majeti Narasimha Vara Prasad
PublisherWiley
Chapter10
Pages227-249
ISBN (Electronic)9781119670186
ISBN (Print)9781119670117
DOIs
Publication statusPublished - 19 Mar 2021

Keywords

  • electrodialytic remediation
  • titania nanotubes
  • hydrogen evolution reaction electrocatalyst
  • critical raw materials recovery

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