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6CCVD Research

Development of a 3D Ni-Mn binary oxide anode for energy-efficient electro-oxidation of organic pollutants

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2024-03-20
JournalJournal of environmental chemical engineering
AuthorsKeyvan Mirehbar, Jaime S. SƔnchez, Sergio Pinilla, F. Palacio, Ignasi SirƩs
InstitutionsIMDEA Energy Institute, Universitat de Barcelona
Citations4

Abstract

Section titled ā€œAbstractā€

The depletion of clean water resources and the consequent accumulation of contaminants in aquatic systems must be urgently addressed by means of innovative solutions. Electro-oxidation (EO) is considered a promising technology, prized for its versatility and eco-friendliness. However, the excessively high prices and the toxicity associated with some of the materials currently employed for EO impede its broader application. This study introduces cost-effective Ni-Mn binary oxide anodes prepared on Ni foam (NF) substrate. A scalable synthesis route that enables a 35-fold increase in the production of active material through a single optimization step has been devised. The synthesized binary oxide material underwent electrochemical characterization, and its effectiveness was assessed in an electrochemical flow-through cell, benchmarked against single Ni or Mn oxides and more conventional alternatives like boron-doped diamond (BDD) and dimensionally-stable anode (DSA). The novel binary oxide anode demonstrated exceptional performance, achieving complete removal of phenol at very low current density of 5 mA cm-2, along with an 80% of chemical oxygen demand (COD) decay within only 60 min. The NF/NiMnO3 anode outperformed the BDD and DSA when using comparable projected surface areas, owing to its high porosity and ability to produce hydroxyl radicals, as confirmed from the degradation profiles in the presence of radical scavengers. Furthermore, GC/MS analysis served to elucidate the degradation pathways of phenol.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
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  6. 2020 - Electrochemical treatment of leachate containing highly concentrated phenol and ammonia using a Pt/Ti anode at different current densities [Crossref]
  7. 2018 - Electrochemical removal of thiamethoxam using three-dimensional porous PbO2-CeO2 composite electrode: electrode characterization, operational parameters optimization and degradation pathways [Crossref]
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