Graphene-linked graphitic carbon nitride/TiO2 nanowire arrays heterojunction for efficient solar-driven water splitting

Jingyang Su, Ping Geng, Xinyong Li, Guohua Chen

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)

Abstract

ÂAbstract: A novel structure composed of TiO2 nanowire arrays (NWAs) was designed and synthesized by decorating with graphene-linked graphitic carbon nitride (GCN) layers. It serves as a robust photoanode for high-performance solar-driven water splitting in an alkaline solution. The GCN layers were deposited on TiO2 NWAs by a facile electrophoretic method, producing an interconnected two-dimensional GCN nanosheets/one-dimensional TiO2 NWAs heterostructure. Under simulated solar light illumination (light intensity 100 mW cm−2), the optimal GCN/TiO2 NWAs photoelectrode produces a photocurrent density of 1.7 mA cm−2 at 1.23 V versus reversible hydrogen electrode (RHE), which is around 2.6 times enhancement from that of pristine TiO2 (0.7 mA cm−2 at 1.23 V vs. RHE). The photo-conversion efficiency of GCN/TiO2 NWAs is up to 0.92 % at a low bias potential 0.50 V versus RHE, 3.6 times higher than pristine TiO2 (0.27 % at 0.59 V vs. RHE). The improved photoelectrochemical activity is mainly because of the improved charge separation and transport within the heterojunction as well as enhanced light absorption. Graphical Abstract: [Figure not available: see fulltext.]
Original languageEnglish
Pages (from-to)807-817
Number of pages11
JournalJournal of Applied Electrochemistry
Volume46
Issue number8
DOIs
Publication statusPublished - 1 Aug 2016
Externally publishedYes

Keywords

  • Graphitic carbon nitride
  • Photoelectrochemical
  • TiO nanowire arrays 2
  • Water splitting

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry
  • Materials Chemistry

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