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Title: Surface-modified, dye-sensitized niobate nanosheets enabling an efficient solar-driven Z-scheme for overall water splitting

Journal Article · · Science Advances

While dye-sensitized metal oxides are good candidates as H2evolution photocatalysts for solar-driven Z-scheme water splitting, their solar-to-hydrogen (STH) energy conversion efficiencies remain low because of uncontrolled charge recombination reactions. Here, we show that modification of Ru dye–sensitized, Pt-intercalated HCa2Nb3O10nanosheets (Ru/Pt/HCa2Nb3O10) with both amorphous Al2O3and poly(styrenesulfonate) (PSS) improves the STH efficiency of Z-scheme overall water splitting by a factor of ~100, when the nanosheets are used in combination with a WO3-based O2evolution photocatalyst and an I3-/I-redox mediator, relative to an analogous system that uses unmodified Ru/Pt/HCa2Nb3O10. By using the optimized photocatalyst, PSS/Ru/Al2O3/Pt/HCa2Nb3O10, a maximum STH of 0.12% and an apparent quantum yield of 4.1% at 420 nm were obtained, by far the highest among dye-sensitized water splitting systems and comparable to conventional semiconductor-based suspended particulate photocatalyst systems.

Research Organization:
Univ. of Pennsylvania, Philadelphia, PA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); Japan Society for the Promotion of Science (JSPS)
Grant/Contract Number:
SC0019781; JP19H02511; JP22H01862; JP22H05148; JP21K20555
OSTI ID:
1904316
Journal Information:
Science Advances, Vol. 8, Issue 32; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

References (37)

Accordion-like swelling of layered perovskite crystals via massive permeation of aqueous solutions into 2D oxide galleries journal January 2015
Development of a New System for Photocatalytic Water Splitting into H2and O2under Visible Light Irradiation journal October 2011
Photocatalysis of Dye-Sensitized TiO 2 Nanoparticles with Thin Overcoat of Al 2 O 3 : Enhanced Activity for H 2 Production and Dechlorination of CCl 4 journal May 2009
Efficient Nonsacrificial Water Splitting through Two-Step Photoexcitation by Visible Light using a Modified Oxynitride as a Hydrogen Evolution Photocatalyst journal April 2010
Excited Carrier Dynamics in a Dye-Sensitized Niobate Nanosheet Photocatalyst for Visible-Light Hydrogen Evolution journal December 2020
Inorganic nanostructures for photoelectrochemical and photocatalytic water splitting journal January 2013
Scalable water splitting on particulate photocatalyst sheets with a solar-to-hydrogen energy conversion efficiency exceeding 1% journal March 2016
Highly Robust Hybrid Photocatalyst for Carbon Dioxide Reduction: Tuning and Optimization of Catalytic Activities of Dye/TiO 2 /Re(I) Organic–Inorganic Ternary Systems journal October 2015
Synthesis of highly active rhodium-doped SrTiO3 powders in Z-scheme systems for visible-light-driven photocatalytic overall water splitting journal January 2013
Flux Synthesis of Layered Oxyhalide Bi 4 NbO 8 Cl Photocatalyst for Efficient Z -Scheme Water Splitting Under Visible Light journal August 2018
Photocatalyst of Lamellar Aggregates of RuO x -Loaded Perovskite Nanosheets for Overall Water Splitting journal September 2005
Varying the Electronic Structure of Surface-Bound Ruthenium(II) Polypyridyl Complexes journal December 2014
Sensitized layered metal oxide semiconductor particles for photochemical hydrogen evolution from nonsacrificial electron donors journal November 1993
Molecule/Semiconductor Hybrid Materials for Visible-Light CO2 Reduction: Design Principles and Interfacial Engineering journal May 2021
Photocatalysis versus Photosynthesis: A Sensitivity Analysis of Devices for Solar Energy Conversion and Chemical Transformations journal January 2017
Photocatalytic solar hydrogen production from water on a 100-m2 scale journal August 2021
Light Intensity Dependence of Photochemical Charge Separation in the BiVO 4 /Ru-SrTiO 3 :Rh Direct Contact Tandem Photocatalyst for Overall Water Splitting journal April 2020
Dye-sensitized photocatalyst for effective water splitting catalyst journal October 2017
Time-Resolved IR Spectroscopy Reveals a Mechanism with TiO 2 as a Reversible Electron Acceptor in a TiO 2 –Re Catalyst System for CO 2 Photoreduction journal January 2017
Efficient Visible-Light-Driven Z-Scheme Overall Water Splitting Using a MgTa 2 O 6− x N y  /TaON Heterostructure Photocatalyst for H 2 Evolution journal June 2015
Efficient and Clean Photoreduction of CO 2 to CO by Enzyme-Modified TiO 2 Nanoparticles Using Visible Light journal February 2010
Photocatalytic water splitting under visible light utilizing I3−/I− and IO3−/I− redox mediators by Z-scheme system using surface treated PtOx/WO3 as O2 evolution photocatalyst journal January 2013
Visible Light Water Splitting Using Dye-Sensitized Oxide Semiconductors journal December 2009
An Artificial Z-Scheme Constructed from Dye-Sensitized Metal Oxide Nanosheets for Visible Light-Driven Overall Water Splitting journal April 2020
Two-Dimensional Metal Oxide Nanosheets as Building Blocks for Artificial Photosynthetic Assemblies journal January 2019
Intercalation of Highly Dispersed Metal Nanoclusters into a Layered Metal Oxide for Photocatalytic Overall Water Splitting journal February 2015
Development of Novel Photocatalyst and Cocatalyst Materials for Water Splitting under Visible Light journal June 2016
Photocatalytic Water Splitting: Recent Progress and Future Challenges journal September 2010
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
Z-scheme water splitting using particulate semiconductors immobilized onto metal layers for efficient electron relay journal August 2015
Dye-Sensitized Photocatalytic Water Splitting and Sacrificial Hydrogen Generation: Current Status and Future Prospects journal May 2017
Photocatalytic water splitting employing a [Fe(CN) 6 ] 3−/4− redox mediator under visible light journal January 2019
Visible-Light-Induced Water Splitting Based on Two-Step Photoexcitation between Dye-Sensitized Layered Niobate and Tungsten Oxide Photocatalysts in the Presence of a Triiodide/Iodide Shuttle Redox Mediator journal October 2013
Visible Light Photolysis of Hydrogen Iodide Using Sensitized Layered Metal Oxide Semiconductors:  The Role of Surface Chemical Modification in Controlling Back Electron Transfer Reactions journal April 1997
An Improved Z-Scheme for Overall Water Splitting Using Dye-Sensitized Calcium Niobate Nanosheets Synthesized by a Flux Method journal September 2021
An investigation into the effect of chemical and thermal treatments on the structural changes of poly(3,4-ethylenedioxythiophene)/polystyrenesulfonate and consequences on its use on indium tin oxide substrates journal January 2004
Redox-Based Visible-Light-Driven Z-Scheme Overall Water Splitting with Apparent Quantum Efficiency Exceeding 10% journal November 2018