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  • Diaz-Morales, OscarTNO/Holst Centre, Eindhoven, The Netherlands,TNO Holst Ctr, Eindhoven, Netherlands. (författare)

Catalytic effects of molybdate and chromate–molybdate films deposited on platinum for efficient hydrogen evolution

  • Artikel/kapitelEngelska2023

Förlag, utgivningsår, omfång ...

  • 2023-03-10
  • Wiley,2023
  • printrdacarrier

Nummerbeteckningar

  • LIBRIS-ID:oai:DiVA.org:kth-331087
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-331087URI
  • https://doi.org/10.1002/jctb.7345DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-502150URI

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:ref swepub-contenttype
  • Ämneskategori:art swepub-publicationtype

Anmärkningar

  • QC 20230705
  • BACKGROUND: Sodium chlorate (NaClO3) is extensively used in the paper industry, but its production uses strictly regulated highly toxic Na2Cr2O7 to reach high hydrogen evolution reaction (HER) Faradaic efficiencies. It is therefore important to find alternatives either to replace Na2Cr2O7 or reduce its concentration.RESULTS: The Na2Cr2O7 concentration can be significantly reduced by using Na2MoO4 as an electrolyte co-additive. Na2MoO4 in the millimolar range shifts the platinum cathode potential to less negative values due to an activating effect of cathodically deposited Mo species. It also acts as a stabilizer of the electrodeposited chromium hydroxide but has a minor effect on the HER Faradaic efficiency. X-ray photoelectron spectroscopy (XPS) results show cathodic deposition of molybdenum of different oxidation states, depending on deposition conditions. Once Na2Cr2O7 was present, molybdenum was not detected by XPS, as it is likely that only trace levels were deposited. Using electrochemical measurements and mass spectrometry we quantitatively monitored H2 and O2 production rates. The results indicate that 3 μmol L−1 Na2Cr2O7 (contrary to current industrial 10–30 mmol L−1) is sufficient to enhance the HER Faradaic efficiency on platinum by 15%, and by co-adding 10 mmol L−1 Na2MoO4 the cathode is activated while avoiding detrimental O2 generation from chemical and electrochemical reactions. Higher concentrations of Na2MoO4 led to increased oxygen production.CONCLUSION: Careful tuning of the molybdate concentration can enhance performance of the chlorate process using chromate in the micromolar range. These insights could be also exploited in the efficient hydrogen generation by photocatalytic water splitting and in the remediation of industrial wastewater. 

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

  • Lindberg, Aleksandra,1990-KTH,Tillämpad elektrokemi,KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Appl Electrochem, SE-10044 Stockholm, Sweden.(Swepub:kth)u1gwc0uy (författare)
  • Smulders, VeraPhotoCatalytic Synthesis Group, MESA+ Institute for Nanotechnology, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands,Univ Twente, MESA Inst Nanotechnol, Fac Sci & Technol, PhotoCatalyt Synth Grp, Enschede, Netherlands. (författare)
  • Anil, AthiraUppsala universitet,Fasta tillståndets fysik(Swepub:uu)athan253 (författare)
  • Simic, NinaNouryon, Bohus, Sweden. (författare)
  • Wildlock, MatsNouryon, Bohus, Sweden. (författare)
  • Alvarez, Germán SalazarUppsala universitet,Fasta tillståndets fysik(Swepub:uu)gersa763 (författare)
  • Mul, GuidoPhotoCatalytic Synthesis Group, MESA+ Institute for Nanotechnology, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands,Univ Twente, MESA Inst Nanotechnol, Fac Sci & Technol, PhotoCatalyt Synth Grp, Enschede, Netherlands. (författare)
  • Mei, BastianPhotoCatalytic Synthesis Group, MESA+ Institute for Nanotechnology, Faculty of Science and Technology, University of Twente, Enschede, The Netherlands; Industrial Chemistry, Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Bochum, Germany,Univ Twente, MESA Inst Nanotechnol, Fac Sci & Technol, PhotoCatalyt Synth Grp, Enschede, Netherlands.;Ruhr Univ Bochum, Fac Chem & Biochem, Ind Chem, Bochum, Germany. (författare)
  • Cornell, Ann M.,1962-KTH,Tillämpad elektrokemi,KTH Royal Inst Technol, Sch Engn Sci Chem Biotechnol & Hlth, Appl Electrochem, SE-10044 Stockholm, Sweden.(Swepub:kth)u1ciapzg (författare)
  • TNO/Holst Centre, Eindhoven, The NetherlandsTNO Holst Ctr, Eindhoven, Netherlands. (creator_code:org_t)

Sammanhörande titlar

  • Ingår i:Journal of chemical technology and biotechnology (1986): Wiley98:5, s. 1269-12780268-25751097-4660

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