Photoelectrochemical Performance of Strontium Titanium Oxynitride Photo-Activated with Cobalt Phosphate Nanoparticles for Oxidation of Alkaline Water

Overview

Journal Nanomaterials (Basel)

Date 2023 Mar 11

PMID 36903798

Authors

Mabrook S Amer

Prabhakarn Arunachalam

Mohamed A Ghanem

Abdullah M Al-Mayouf

Mark T Weller

Affiliations

Soon will be listed here.

Abstract

Photoelectrochemical (PEC) solar water splitting is favourable for transforming solar energy into sustainable hydrogen fuel using semiconductor electrodes. Perovskite-type oxynitrides are attractive photocatalysts for this application due to their visible light absorption features and stability. Herein, strontium titanium oxynitride (STON) containing anion vacancies of SrTi(O,N) was prepared via solid phase synthesis and assembled as a photoelectrode by electrophoretic deposition, and their morphological and optical properties and PEC performance for alkaline water oxidation are investigated. Further, cobalt-phosphate (CoPi)-based co-catalyst was photo-deposited over the surface of the STON electrode to boost the PEC efficiency. A photocurrent density of ~138 μA/cm at 1.25 V versus RHE was achieved for CoPi/STON electrodes in presence of a sulfite hole scavenger which is approximately a four-fold enhancement compared to the pristine electrode. The observed PEC enrichment is mainly due to the improved kinetics of oxygen evolution because of the CoPi co-catalyst and the reduced surface recombination of the photogenerated carriers. Moreover, the CoPi modification over perovskite-type oxynitrides provides a new dimension for developing efficient and highly stable photoanodes in solar-assisted water-splitting reactions.

References

Zhong D, Gamelin D . Photoelectrochemical water oxidation by cobalt catalyst ("Co-Pi")/alpha-Fe(2)O(3) composite photoanodes: oxygen evolution and resolution of a kinetic bottleneck. J Am Chem Soc. 2010; 132(12):4202-7. DOI: 10.1021/ja908730h. View

Maeda K, Teramura K, Lu D, Takata T, Saito N, Inoue Y . Photocatalyst releasing hydrogen from water. Nature. 2006; 440(7082):295. DOI: 10.1038/440295a. View

McAlpin J, Surendranath Y, Dinca M, Stich T, Stoian S, Casey W . EPR evidence for Co(IV) species produced during water oxidation at neutral pH. J Am Chem Soc. 2010; 132(20):6882-3. DOI: 10.1021/ja1013344. View

Fujishima A, Honda K . Electrochemical photolysis of water at a semiconductor electrode. Nature. 1972; 238(5358):37-8. DOI: 10.1038/238037a0. View

Hu Y, Kleiman-Shwarsctein A, Stucky G, McFarland E . Improved photoelectrochemical performance of Ti-doped alpha-Fe2O3 thin films by surface modification with fluoride. Chem Commun (Camb). 2009; (19):2652-4. DOI: 10.1039/b901135h. View

Ai G, Mo R, Li H, Zhong J . Cobalt phosphate modified TiO2 nanowire arrays as co-catalysts for solar water splitting. Nanoscale. 2015; 7(15):6722-8. DOI: 10.1039/c5nr00863h. View

Gratzel M . Photoelectrochemical cells. Nature. 2001; 414(6861):338-44. DOI: 10.1038/35104607. View

Liang H, Gandi A, Anjum D, Wang X, Schwingenschlogl U, Alshareef H . Plasma-Assisted Synthesis of NiCoP for Efficient Overall Water Splitting. Nano Lett. 2016; 16(12):7718-7725. DOI: 10.1021/acs.nanolett.6b03803. View

Lutterman D, Surendranath Y, Nocera D . A self-healing oxygen-evolving catalyst. J Am Chem Soc. 2009; 131(11):3838-9. DOI: 10.1021/ja900023k. View

10.

Sayama K, Nomura A, Zou Z, Abe R, Abe Y, Arakawa H . Photoelectrochemical decomposition of water on nanocrystalline BiVO4 film electrodes under visible light. Chem Commun (Camb). 2003; (23):2908-9. DOI: 10.1039/b310428a. View

11.

Walter M, Warren E, McKone J, Boettcher S, Mi Q, Santori E . Solar water splitting cells. Chem Rev. 2010; 110(11):6446-73. DOI: 10.1021/cr1002326. View

12.

Arunachalam P, Shaddad M, Ghanem M, Al-Mayouf A, Weller M . Zinc Tantalum Oxynitride (ZnTaO₂N) Photoanode Modified with Cobalt Phosphate Layers for the Photoelectrochemical Oxidation of Alkali Water. Nanomaterials (Basel). 2018; 8(1). PMC: 5791135. DOI: 10.3390/nano8010048. View

13.

Si W, Pergolesi D, Haydous F, Fluri A, Wokaun A, Lippert T . Investigating the behavior of various cocatalysts on LaTaON photoanode for visible light water splitting. Phys Chem Chem Phys. 2016; 19(1):656-662. DOI: 10.1039/c6cp07253d. View

14.

Kanan M, Nocera D . In situ formation of an oxygen-evolving catalyst in neutral water containing phosphate and Co2+. Science. 2008; 321(5892):1072-5. DOI: 10.1126/science.1162018. View

15.

Kato H, Asakura K, Kudo A . Highly efficient water splitting into H2 and O2 over lanthanum-doped NaTaO3 photocatalysts with high crystallinity and surface nanostructure. J Am Chem Soc. 2003; 125(10):3082-9. DOI: 10.1021/ja027751g. View

16.

Pichler M, Szlachetko J, Castelli I, Marzari N, Dobeli M, Wokaun A . Determination of Conduction and Valence Band Electronic Structure of LaTiO N Thin Film. ChemSusChem. 2017; 10(9):2099-2106. DOI: 10.1002/cssc.201601632. View

17.

Amano F, Li D, Ohtani B . Fabrication and photoelectrochemical property of tungsten(vi) oxide films with a flake-wall structure. Chem Commun (Camb). 2010; 46(16):2769-71. DOI: 10.1039/b926931b. View