Novel cobalt-fumarate framework as a robust and efficient electrocatalyst for water oxidation at neutral pH

Mariam Bartool, Shaista Ibrahim, Bushra Iqbal, Saqib Ali, Amin Badshah, Saghir Abbas, David R. Turner, Muhammad Arif Nadeem

Research output: Contribution to journalArticleResearchpeer-review

6 Citations (Scopus)


The development of efficient and cost-effective electrocatalysts for oxygen evolution reaction is a priority research area. Metal-organic frameworks (MOFs) have recently captured attention as heterogeneous water oxidation catalysts. In spite of their robustness and stability under specific pH conditions, the relatively low current density achieved is their main drawback. Herein, we explored a cobalt based framework [Co(bpy)(fa)]n(DMF)0.25(bpy)0.25 (1) {bpy = 4,4ʹ-bipyridine, fa = fumarate, DMF = dimethylformamide} as an efficient electrocatalyst for the water oxidation reaction. Compound 1 exhibits excellent activity in a neutral phosphate buffer solution. Chronoamperometric studies show that 1 offers a current density of 10 mA cm−2 at only η = 382 mV. Onset over-potential of 248 mV is observed which holds a Tafel slope value of 84 mV dec−1. The catalyst showed a turnover frequency (TOF) of 2 × 10−3 s−1 for oxygen evolution reaction (OER) at 289 mV. Detailed electrochemical studies, including long-term electrolysis, indicates the potential of compound 1 to be utilized as heterogeneous catalyst toward the oxygen evolution reaction.

Original languageEnglish
Pages (from-to)248-253
Number of pages6
JournalElectrochimica Acta
Publication statusPublished - 1 Mar 2019


  • Electrocatalyst
  • Metal-organic framework
  • Over-potential
  • Turnover frequency
  • Water oxidation

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