skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Combinatorial Discovery of Lanthanum–Tantalum Oxynitride Solar Light Absorbers with Dilute Nitrogen for Solar Fuel Applications

Journal Article · · ACS Combinatorial Science
ORCiD logo [1];  [2];  [3];  [4]; ORCiD logo [2]; ORCiD logo [5]; ORCiD logo [3]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP); Toyota Research Inst., Mountain View, CA (United States)
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)
  3. California Inst. of Technology (CalTech), Pasadena, CA (United States). Joint Center for Artificial Photosynthesis (JCAP)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Joint Center for Artificial Photosynthesis (JCAP) and Molecular Biophysics and Integrated Bioimaging Division

Oxynitrides with the photoelectrochemical stability of oxides and desirable band energetics of nitrides comprise a promising class of materials for solar photochemistry. Challenges in synthesizing a wide variety of oxynitride materials has limited exploration of this class of functional materials, which we address using a reactive cosputtering combined with rapid thermal processing method to synthesize multi-cation–multi-anion libraries. We demonstrate the synthesis of a LaxTa1–xOyNz thin film composition spread library and its characterization by both traditional thin film materials characterization and custom combinatorial optical spectroscopy and X-ray absorption near edge spectroscopy (XANES) techniques, ultimately establishing structure-chemistry-property relationships. We observe that over a substantial La–Ta composition range the thin films crystallize in the same perovskite LaTaON2 structure with significant variation of anion chemistry. The relative invariance in optical band gap demonstrates a remarkable decoupling of composition and band energetics so that the composition can be optimized while retaining the desirable 2 eV band gap energy. We also demonstrate the intercalation of diatomic nitrogen into the La3TaO7 structure, which gives rise to a direct-allowed optical transition at 2.2 eV, less than half the value of the oxide’s band gap. These findings motivate further exploration of the visible light response of this material that is predicted to be stable over a wide range of electrochemical potential.

Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
SC0004993; AC02-05CH11231
OSTI ID:
1468652
Alternate ID(s):
OSTI ID: 1468651
Journal Information:
ACS Combinatorial Science, Vol. 20, Issue 1; ISSN 2156-8952
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

References (59)

Systematical investigation on characteristics of a photocatalyst: tantalum oxynitrides journal June 2014
Oxynitrogenography: Controlled Synthesis of Single-Phase Tantalum Oxynitride Photoabsorbers journal October 2015
Synthesis and Photocatalytic Activity of Perovskite Niobium Oxynitrides with Wide Visible-Light Absorption Bands journal November 2010
Recent progress in the development of (oxy)nitride photocatalysts for water splitting under visible-light irradiation journal July 2013
First principles high throughput screening of oxynitrides for water-splitting photocatalysts journal January 2013
New cubic perovskites for one- and two-photon water splitting using the computational materials repository journal January 2012
A Complex Perovskite-Type Oxynitride: The First Photocatalyst for Water Splitting Operable at up to 600 nm journal January 2015
Visible-light-driven photocatalytic behavior of tantalum-oxynitride and nitride journal January 2007
Synthesis of Ta 3 N 5 Nanotube Arrays Modified with Electrocatalysts for Photoelectrochemical Water Oxidation journal June 2012
Wet ammonia Synthesis of Semiconducting N:Ta2O5, Ta3N5 and β-TaON Films for Photoanode Applications journal January 2012
Thermodynamic properties and electrical conductivity of Ta3N5 and TaON journal February 1972
Synthesis of crystallized TaON and Ta3N5 by nitridation of Ta2O5 thin films grown by pulsed laser deposition journal January 2004
Synthesis, sintering and characterisation of TaON materials journal August 2008
Intrinsic defects and electronic conductivity of TaON: First-principles insights journal November 2011
High-Temperature Ammonolysis of Thin Film Ta 2 O 5 Photoanodes: Evolution of Structural, Optical, and Photoelectrochemical Properties journal January 2015
Perovskite-related oxynitrides – Recent developments in synthesis, characterisation and investigations of physical properties journal December 2009
Optical and structural properties of silicon oxynitride deposited by plasma enhanced chemical vapor deposition journal December 2010
Intercalation Route to Complex Perovskites AM 0.2 Ta 0.8 O 2.8 N 0.2 (A = Sr, Ba; M = Li, Na): Neutron Diffraction and Nuclear Magnetic Resonance Study journal December 2014
Deposition of zirconium oxynitride films by reactive cathodic arc evaporation and investigation of physical properties journal February 2008
Design and Development of Oxynitride Photocatalysts for Overall Water Splitting under Visible Light Irradiation journal September 2015
Fabrication of efficient TaON and Ta3N5 photoanodes for water splitting under visible light irradiation journal January 2011
Automated Phase Mapping with AgileFD and its Application to Light Absorber Discovery in the V–Mn–Nb Oxide System journal December 2016
High Throughput Light Absorber Discovery, Part 2: Establishing Structure–Band Gap Energy Relationships journal October 2016
High Throughput Light Absorber Discovery, Part 1: An Algorithm for Automated Tauc Analysis journal October 2016
The role of the CeO 2 /BiVO 4 interface in optimized Fe–Ce oxide coatings for solar fuels photoanodes journal January 2016
Development of solar fuels photoanodes through combinatorial integration of Ni–La–Co–Ce oxide catalysts on BiVO 4 journal January 2016
Solar fuels photoanode materials discovery by integrating high-throughput theory and experiment journal March 2017
Solar fuel photoanodes prepared by inkjet printing of copper vanadates journal January 2016
High Throughput Discovery of Solar Fuels Photoanodes in the CuO-V 2 O 5 System journal August 2015
Mn 2 V 2 O 7 : An Earth Abundant Light Absorber for Solar Water Splitting journal January 2015
Characterisation of r.f. sputtered tungsten disulfide and oxysulfide thin films journal September 2002
Silicon oxynitride films deposited by reactive high power impulse magnetron sputtering using nitrous oxide as a single-source precursor
  • Hänninen, Tuomas; Schmidt, Susann; Jensen, Jens
  • Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films, Vol. 33, Issue 5 https://doi.org/10.1116/1.4927493
journal September 2015
Combining reactive sputtering and rapid thermal processing for synthesis and discovery of metal oxynitrides journal May 2015
Investigation of zirconium oxynitride thin films deposited by reactive pulsed magnetron sputtering journal November 2007
Influence of nitrogen content on properties of direct current sputtered TiOxNy films journal January 2004
New Non-Oxide Photocatalysts Designed for Overall Water Splitting under Visible Light journal June 2007
An analysis of the optimal band gaps of light absorbers in integrated tandem photoelectrochemical water-splitting systems journal January 2013
Thermodynamic and achievable efficiencies for solar-driven electrochemical reduction of carbon dioxide to transportation fuels journal October 2015
Photocatalytic Water Splitting into H 2 and O 2 over R 3 TaO 7 and R 3 NbO 7 (R = Y, Yb, Gd, La):  Effect of Crystal Structure on Photocatalytic Activity journal January 2004
Photocatalytic Activity of R 3 MO 7 and R 2 Ti 2 O 7 (R = Y, Gd, La; M = Nb, Ta) for Water Splitting into H 2 and O 2 journal February 2006
Ta L3-edge XANES study of perovskite oxynitrides ATaO2N (A=Ca, Sr, Ba) journal February 2014
High-throughput on-the-fly scanning ultraviolet-visible dual-sphere spectrometer journal January 2015
New Contributions to the Optics of Intensely Light-Scattering Materials Part I journal January 1948
On-the-fly Scan: Improving the Performance of Absorption Spectrum Measurement journal March 2013
The probing depth of total electron yield in the sub-keV range: TEY-XAS and X-PEEM journal July 2003
Quantitative Estimation Methods for Concentrations and Layer Thicknesses of Elements Using Edge-jump Ratios of X-ray Absorption Spectra journal January 2010
Calculated Pourbaix Diagrams of Cubic Perovskites for Water Splitting: Stability Against Corrosion journal October 2013
Revised effective ionic radii and systematic studies of interatomic distances in halides and chalcogenides journal September 1976
Bond covalency in perovskite oxynitrides ATaO2N (A = Ca, Sr, Ba) studied by 14N NMR spectroscopy journal May 2012
Photocatalytic decomposition of acetone using LaTi(O,N)3 nanoparticles under visible light irradiation journal January 2008
Optical Properties of Nitrogen-Substituted Strontium Titanate Thin Films Prepared by Pulsed Laser Deposition journal September 2009
Structural, optical, and electrical properties of WOx(Ny) films deposited by reactive dual magnetron sputtering journal December 2006
The maximum predicted content of cation vacancies in inorganic and organic–inorganic perovskites: the role of the tolerance factor journal January 2017
Calibration method at the N K -edge using interstitial nitrogen gas in solid-state nitrogen-containing inorganic compounds journal July 2008
Tantalum and niobium perovskite oxynitrides: Synthesis and analysis of the thermal behaviour journal November 2005
Thermochemistry of a New Class of Materials Containing Dinitrogen Pairs in an Oxide Matrix journal June 2005
Commentary: The Materials Project: A materials genome approach to accelerating materials innovation journal July 2013
Prediction of solid-aqueous equilibria: Scheme to combine first-principles calculations of solids with experimental aqueous states journal June 2012
Thermally Stable N 2 -Intercalated WO 3 Photoanodes for Water Oxidation journal October 2012

Cited By (2)

Functional Oxides for Photoneuromorphic Engineering: Toward a Solar Brain journal June 2019
Recent advances in high-throughput superconductivity research journal November 2019