A trinuclear cobalt-based coordination polymer as an efficient oxygen evolution electrocatalyst at neutral pH

Shaista Ibrahim, Kiran Shehzadi, Bushra Iqbal, Saghir Abbas, David R. Turner, Muhammad Arif Nadeem

Research output: Contribution to journalArticleResearchpeer-review

10 Citations (Scopus)

Abstract

The dearth of an efficient, robust, abundant and cost-effective water oxidation catalyst is debatably the major hurdle for the technological advancement of artificial photosynthesis devices. Herein, a three dimensional (3D) cobalt-based coordination polymer {[Co 3 (pyz)(fa) 3 (dmso) 2 ]·2H 2 O} n , (1) (pyz = pyrazine, fa = fumarate, dmso = dimethyl sulfoxide) has been synthesized and demonstrated to act as an efficient electrocatalyst towards water oxidation at neutral pH. Compound 1 displays a stair-like arrangement parallel to the b-axis, with the cobalt clusters arranged in a zigzag fashion, and contains small, honeycomb-like channels parallel to the c-axis. Compound 1 shows a remarkable activity for water oxidation and attains a current density of 1 mA.cm −2 at low overpotential (η = 257 mV) with a Tafel slope value of 80.5 mV.dec −1 . This high performance of 1 in catalysing the water oxidation reaction is attributed to its unique 3-D architecture. The results of electrochemical investigations, including long-term and controlled potential electrolysis, are anticipated to guide the forthcoming advancement in creating efficient, cheap and noble metal (Pt/Ru/Ir) free catalysts for the water oxidation reaction.

Original languageEnglish
Pages (from-to)269-275
Number of pages7
JournalJournal of Colloid and Interface Science
Volume545
DOIs
Publication statusPublished - 1 Jun 2019

Keywords

  • Cobalt
  • Electrocatalyst
  • Overpotential
  • Turnover frequency
  • Water oxidation

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