Preparation of amorphous and nanocrystalline sodium tantalum oxide photocatalysts with porous matrix structure for overall water splitting

Harun Tüysüz, Candace K. Chan

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

Herein, we report the preparation of a series of surfactant-free nanostructured sodium tantalum oxide using NaTa(OC3H7)6 as a single precursor. The reaction conditions for the novel synthetic method were optimized and the morphology and crystal structure of the prepared materials were investigated by transmission electron microscopy (TEM), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). Condensation and polymerization of NaTa(OC3H7)6 under atmospheric pressure gave a porous amorphous structure that could be converted to crystalline NaTaO3 while crystalline Na2Ta2O6 nanocrystals with a 25nm average particle size could be obtained from a hydrothermal method using NH3 as a base catalyst. In addition, the photocatalytic behaviors of the prepared materials were investigated for overall water splitting into hydrogen and oxygen. Unexpectedly, porous amorphous sodium tantalum oxide showed much better catalytic activity over the crystalline one. The synthesized Na2Ta2O6 nanocrystals also indicated promising activity for overall water splitting without any co-catalyst in comparison to bulk NaTaO3.

Original languageEnglish
Pages (from-to)116-123
Number of pages8
JournalNano Energy
Volume2
Issue number1
DOIs
Publication statusPublished - Jan 1 2013

Keywords

  • Hydrogen production
  • Nanomaterials
  • Photocatalyst
  • Porous materials
  • Sodium tantalum oxide
  • Water splitting

ASJC Scopus subject areas

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

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