4.7 Article

Cobalt-Doped TiO2 Nanowire Arrays Coated with NiFe Layered-Double-Hydroxide Nanoplatelets as Photoanodes for Photoelectrochemical Water Oxidation

期刊

ACS APPLIED NANO MATERIALS
卷 3, 期 7, 页码 6598-6608

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsanm.0c01049

关键词

TiO2; photoelectrochemical water oxidation; NiFe layered double hydroxide; doping

资金

  1. National Natural Science Foundation of China [51702025, 51874050]
  2. Top-notch Academic Programs Project of Jiangsu Higher Education Institutions
  3. Priority Academic Program Development of Jiangsu Higher Education Institutions

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We demonstrate the fabrication of controlled Co-doped TiO2 nanowire arrays modified by an ultrathin NiFe layered double hydroxide (LDH) as a photoanode for enhanced photoelectrochemical water-splitting application. The Co-TiO2/NiFe LDH heterostructured photoanode exhibited a significantly enhanced photocurrent density of 1.66 mA/cm(2) at 1.23 V versus reversible hydrogen electrode, up to 1.86 times higher than that of bare TiO2, mainly because of the improved charge separation, suppressed charge recombination, and increased kinetics of the surface water oxidation reaction. The X-ray photoelectron spectroscopy measurements confirmed that TiO2 photoanodes possessed abundant oxygen vacancies, which could effectively boost the hole trapping/transfer and supply more active sites for water oxidation. Photoinduced electrochemical impedance spectroscopy indicated that enhanced conductivity could also promote photogenerated electron transfer from the thin film to the substrate. The Co-TiO2/NiFe LDH photoelectrode presented excellent photostability under 7 h of continuous illumination and an increased photoconversion of 0.55%, 2.64 times higher than that of a bare TiO2 photoelectrode.

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