In Situ Synthesis of Core-Shell-Ni 3 Fe(OH) 9 /Ni 3 Fe Hybrid Nanostructures as Highly Active and Stable Bifunctional Catalysts for Water Electrolysis

Changlong Xiao, Xinyi Zhang, Shuni Li, Bryan Harry Rahmat Suryanto, Douglas Robert Macfarlane

Research output: Contribution to journalArticleResearchpeer-review

8 Citations (Scopus)

Abstract

Development of cost-effective, high-performance electrocatalysts for water splitting is the key technological requirement for the hydrogen economy. Here, we report an in situ transformation approach for the preparation of a core-shell structured bifunctional electrocatalyst composed of a metallic Ni 3 Fe nanosheet-framework and a thin layer of Ni 3 Fe(OH) 9 shell on various substrates. The Ni 3 Fe alloy nanostructured framework provides large electroactive surface area and accelerates the charge transport, while the Ni 3 Fe(OH) 9 nanoshell allows an excellent electrochemical accessibility and high catalytic activity. When acting as an anode for the oxygen evolution reaction (OER), the hybrid catalyst is characterized by a low onset potential (η onset = 230 mV), small Tafel slope (28 mV/dec), and stable catalytic activity (over 24 h). More importantly, the hybrid can act as an excellent bifunctional catalyst and deliver a current density of 10 mA cm -2 at a cell voltage of 1.63 V with long stability in a symmetric alkaline electrolyzer for overall water electrolysis.

Original languageEnglish
Pages (from-to)986-992
Number of pages7
JournalACS Applied Energy Materials
Volume1
Issue number3
DOIs
Publication statusPublished - 26 Mar 2018

Keywords

  • bifunctional electrocatalyst
  • core-shell structure
  • in situ synthesis
  • NiFe layered double hydroxide
  • water electrolysis

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