Enhancing electrocatalytic total water splitting at few layer Pt-NiFe layered double hydroxide interfaces

Sengeni Anantharaj, Kannimuthu Karthick, Murugadoss Venkatesh, Tangella V.S.V. Simha, Ashish S. Salunke, Lian Ma, Hong Liang, Subrata Kundu

Research output: Contribution to journalArticlepeer-review

126 Citations (Scopus)

Abstract

Formation of NiFe layered double hydroxide (LDH) with Pt NPs was achieved following a two-step reaction viz., the hydrothermal preparation of highly crystalline NiFe LDH sheets and the homogenous reduction of Pt4+ ions with borohydride in a solution of homogenized NiFe LDH crystalline sheets. Chemically equivalent NiFe LDH material decorated with Pt NPs was prepared by co-precipitation for comparative studies. The synthesized catalysts were systematically screened for oxygen and hydrogen evolution reactions (OER and HER) in 1 M KOH. The intentional incorporation of Pt NPs on the LDH layers reduced the cell voltage and delivered high current densities with a lower loading of 0.205 mg cm−2. The NiFe LDH crystalline sheets had shown significantly enhanced activity, good stability, lower overpotential (90 mV) at 10 mA cm−2 and lower Tafel slope (12 mV dec−1) than the co-precipitated NiFe LDH in OER. Similarly, Pt NPs tethered NiFe LDH crystalline sheets showed better activity by having lower overpotential (27 mV) and Tafel slope (51 mV dec−1) than the co-precipitated NiFe LDH with Pt NPs. Moreover, the state-of-the-art catalysts viz., IrO2 and Pt/C 20 wt% of OER and HER failed in competing with Pt NPs tethered NiFe LDH crystalline sheets.

Original languageEnglish
Pages (from-to)30-43
Number of pages14
JournalNano Energy
Volume39
DOIs
Publication statusPublished - 2017 Sep
Externally publishedYes

Keywords

  • Hydrogen evolution
  • NiFe layered double hydroxide
  • Overpotential
  • Oxygen evolution
  • Pt Nanoparticle
  • Water splitting

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)
  • Electrical and Electronic Engineering

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