Heterogeneous Electrocatalysts for Efficient Water Oxidation Derived from Metal Phthalocyanine

Khurram Saleem Joya*, Noor Ul Ain Babar, Syeda Robina Gilani, Farhat Yasmeen, Muhammad Sarfaraz, Sehrish Ikram, Suleyman Gokhan Colak, Kasim Ocakoglu, Mine Ince

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Designing an efficient electrocatalytic system for water splitting with high stability using low-cost materials and simple methods is highly demanded for application in chemical energy conversion. Here, we show active water oxidation catalysis using surface immobilized Co and Ni-based heterogeneous electrocatalytic assemblages, by the conversion of molecular precursors into more efficient heterogeneous phase electrocatalysts. The inorganic nanostructured electrocatalysts are developed by simple low-temperature surface spraying from homogeneous CoPc and NiPc solutions following short time heat treatment at 350 degrees C and 500 degrees C. On NiOx and CoOx based electrocatalysts (CoOx500@FTO, NiOx350@FTO) derived from CoPc and NiPc molecular precursors, oxygen evolution initiates at 1.54 V (vs. RHE) [eta = 310 mV] and 1.55 V (vs. RHE) [eta = 320 mV], respectively. The electrocatalysts also show good stability during repetitive potential scans under alkaline conditions. Each of catalyst under study produces remarkable current densities just at an overpotential of eta = 0.45 V during long-term water electrolysis experiments conducted for 12 hours. It illustrates the high stability of as-deposited catalyst under harsh oxidative conditions. This unique slant provides a simplistic way for transformation of molecular catalyst into nanoscale catalyst using a much lower amount of molecular precursor.
Original languageEnglish
JournalChemistrySelect
Volume3
Issue number40
Pages (from-to)11357-11366
ISSN2365-6549
DOIs
Publication statusPublished - 2018

Keywords

  • Catalysis
  • Current density
  • Electrocatalyst
  • Metal phthalocyanine
  • Overpotential
  • Water oxidation

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