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Title: Role of Short-Range Chemical Ordering in (GaN)1–x(ZnO)x for Photodriven Oxygen Evolution

Journal Article · · Chemistry of Materials

(GaN)1–x(ZnO)x (GZNO) is capable of visible-light driven water splitting, but its bandgap at x ≤ 0.15 (>2.7 eV) results in poor visible-light absorption. Unfortunately, methods to narrow its bandgap by incorporating higher ZnO concentrations are accompanied by extensive Urbach tailing near the absorption-edge, which is indicative of structural disorder or chemical inhomogeneities. We evaluated whether this disorder is intrinsic to the bond-length distribution in GZNO or is a result of defects introduced from the loss of Zn during nitridation. Here, the synthesis of GZNO derived from layered double hydroxide (LDH) precursors is described which minimizes Zn loss and chemical inhomogeneities and enhances visible-light absorption. The average and local atomic structures of LDH-derived GZNO were investigated using X-ray and neutron scattering and are correlated with their oxygen evolution rates. An isotope-contrasted neutron-scattering experiment was conducted in conjunction with reverse Monte Carlo (RMC) simulations. We showed that a bond-valence bias in the RMC refinements reproduces the short-range ordering (SRO) observed in structure refinements using isotope-contrasted neutron data. The findings suggest that positional disorder of cation–anion pairs in GZNO partially arises from SRO and influences local bond relaxations. Furthermore, particle-based oxygen evolution reactions (OERs) in AgNO3 solution reveal that the crystallite size of GZNO correlates more than positional disorder with oxygen evolution rate. In conclusion, these findings illustrate the importance of examining the local structure of multinary photocatalysts to identify dominant factors in particulate-based photodriven oxygen evolution.

Research Organization:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS); Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Oak Ridge Inst. for Science and Education (ORISE), Oak Ridge, TN (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Office of Workforce Development for Teachers & Scientists (WDTS)
Grant/Contract Number:
AC05-00OR22725; AC02-06CH11357; SC0014664
OSTI ID:
1376368
Journal Information:
Chemistry of Materials, Vol. 29, Issue 15; ISSN 0897-4756
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 16 works
Citation information provided by
Web of Science

References (44)

Powering the planet: Chemical challenges in solar energy utilization journal October 2006
Solar Energy Supply and Storage for the Legacy and Nonlegacy Worlds journal November 2010
Solar Water Splitting Cells journal November 2010
GaN:ZnO Solid Solution as a Photocatalyst for Visible-Light-Driven Overall Water Splitting journal June 2005
Effect of post-calcination on photocatalytic activity of (Ga1−xZnx)(N1−xOx) solid solution for overall water splitting under visible light journal March 2008
Particle suspension reactors and materials for solar-driven water splitting journal January 2015
Photocatalytic Water Splitting Using Modified GaN:ZnO Solid Solution under Visible Light: Long-Time Operation and Regeneration of Activity journal April 2012
The Effects of Starting Materials in the Synthesis of (Ga1− x Zn x )(N1− x O x ) Solid Solution on Its Photocatalytic Activity for Overall Water Splitting under Visible Light journal April 2009
Overall Water Splitting on (Ga 1 - x Zn x )(N 1 - x O x ) Solid Solution Photocatalyst:  Relationship between Physical Properties and Photocatalytic Activity journal November 2005
Nitridation Temperature Effects on Electronic and Chemical Properties of (Ga 1– x Zn x )(N 1– x O x ) Solid Solution Nanocrystals journal September 2013
Inorganic nanostructures for photoelectrochemical and photocatalytic water splitting journal January 2013
Photocatalytic Activity of (Ga 1- x Zn x )(N 1- x O x ) for Visible-Light-Driven H 2 and O 2 Evolution in the Presence of Sacrificial Reagents journal March 2008
The Long-Wavelength Edge of Photographic Sensitivity and of the Electronic Absorption of Solids journal December 1953
Über die excitonenbanden der alkalihalogenidkristalle journal January 1957
Absence of Diffusion in Certain Random Lattices journal March 1958
Conduction in non-crystalline materials: III. Localized states in a pseudogap and near extremities of conduction and valence bands journal April 1969
Conduction in non-Crystalline systems: IV. Anderson localization in a disordered lattice journal July 1970
Amorphous Oxide Semiconductors for High-Performance Flexible Thin-Film Transistors journal May 2006
Solid Solution of GaN and ZnO as a Stable Photocatalyst for Overall Water Splitting under Visible Light journal February 2010
Phase diagram, structure, and electronic properties of (Ga 1 x Zn x )(N 1 x O x ) solid solutions from DFT-based simulations journal April 2011
Special quasiordered structures: Role of short-range order in the semiconductor alloy ( GaN ) 1 x ( ZnO ) x journal February 2016
Average and Local Crystal Structures of (Ga 1– x Zn x )(N 1– x O x ) Solid Solution Nanoparticles journal November 2015
Mesoporous Metal Nitride Materials Prepared from Bulk Oxides journal July 2012
Synthesis of (Ga 1– x Zn x )(N 1– x O x ) with Enhanced Visible-Light Absorption and Reduced Defects by Suppressing Zn Volatilization journal February 2016
Synthesis of Gallium Oxide Hydroxide Crystals in Aqueous Solutions with or without Urea and Their Calcination Behavior journal June 2002
The Nanoscale Ordered MAterials Diffractometer NOMAD at the Spallation Neutron Source SNS
  • Neuefeind, Jörg; Feygenson, Mikhail; Carruth, John
  • Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, Vol. 287 https://doi.org/10.1016/j.nimb.2012.05.037
journal September 2012
A comparison of various commonly used correlation functions for describing total scattering journal April 2001
EXPGUI , a graphical user interface for GSAS journal April 2001
PDFfit2 and PDFgui: computer programs for studying nanostructure in crystals journal July 2007
RMCProfile: reverse Monte Carlo for polycrystalline materials journal July 2007
Bond-valence parameters for solids journal April 1991
VESTA 3 for three-dimensional visualization of crystal, volumetric and morphology data journal October 2011
Chemical actinometry (IUPAC Technical Report) journal January 2004
Heterogeneous photocatalyst materials for water splitting journal January 2009
Facile synthesis of Zn-rich (GaN)1−x(ZnO)x solid solutions using layered double hydroxides as precursors journal January 2011
(Ga 1– x Zn x )(N 1– x O x ) Nanocrystals: Visible Absorbers with Tunable Composition and Absorption Spectra journal May 2012
Quinary wurtzite Zn-Ga-Ge-N-O solid solutions and their photocatalytic properties under visible light irradiation journal January 2016
Local atomic strain in ZnSe 1 x Te x from high real-space resolution neutron pair distribution function measurements journal April 2001
Quantitative size-dependent structure and strain determination of CdSe nanoparticles using atomic pair distribution function analysis journal September 2007
First-Principles Studies of the Structural and Electronic Properties of the (Ga 1 - x Zn x )(N 1 - x O x ) Solid Solution Photocatalyst journal March 2008
Photocatalytic Activity of Inorganic Semiconductor Surfaces: Myths, Hype, and Reality journal December 2014
Impurity effects in ZnO and nitrogen-doped ZnO thin films fabricated by MOCVD journal January 2006
Aspects of the Water Splitting Mechanism on (Ga 1− x Zn x )(N 1− x O x ) Photocatalyst Modified with Rh 2− y Cr y O 3 Cocatalyst journal November 2009
A simplified theoretical guideline for overall water splitting using photocatalyst particles journal January 2016