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Title: A graded catalytic–protective layer for an efficient and stable water-splitting photocathode

Journal Article · · Nature Energy

Achieving solar-to-hydrogen efficiencies above 15% is key for the commercial success of photoelectrochemical water splitting devices. While tandem cells can reach those efficiencies, increasing the catalytic activity and long-term stability remains a significant challenge. We show that annealing a bilayer of amorphous titanium dioxide (TiOx) and molybdenum sulfide (MoSx) deposited onto GaInP2 results in a photocathode with high catalytic activity (current density of 11 mA/cm-2 at 0 V vs. the reversible hydrogen electrode under 1 sun illumination) and stability (retention of 80% of initial photocurrent density over a 20 h durability test) for the hydrogen evolution reaction. Microscopy and spectroscopy reveal that annealing results in a graded MoSx/MoOx/TiO2 layer that retains much of the high catalytic activity of amorphous MoSx but with stability similar to crystalline MoS2. These findings demonstrate the potential of utilizing a hybridized, heterogeneous surface layer as a cost-effective catalytic and protective interface for solar hydrogen production.

Research Organization:
National Renewable Energy Laboratory (NREL), Golden, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC36-08GO28308
OSTI ID:
1339236
Report Number(s):
NREL/JA-5900-67483
Journal Information:
Nature Energy, Vol. 2; ISSN 2058-7546
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 110 works
Citation information provided by
Web of Science

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Tuning Internal Strain in Metal–Organic Frameworks via Vapor Phase Infiltration for CO 2 Reduction journal January 2020
Building a Thermostable Metabolon for Facilitating Coenzyme Transport and In Vitro Hydrogen Production at Elevated Temperature journal August 2018
Stable p‐type Cu:CdS 1− x Se x /Pt Thin‐Film Photocathodes with Fully Tunable Bandgap for Scavenger‐Free Photoelectrochemical Water Splitting journal January 2020
Multiple exciton generation for photoelectrochemical hydrogen evolution reactions with quantum yields exceeding 100% journal April 2017
Crystalline TiO2 protective layer with graded oxygen defects for efficient and stable silicon-based photocathode journal September 2018
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High performance III-V photoelectrodes for solar water splitting via synergistically tailored structure and stoichiometry journal July 2019
An efficient and stable photoelectrochemical system with 9% solar-to-hydrogen conversion efficiency via InGaP/GaAs double junction journal November 2019
Spatial control of cocatalysts and elimination of interfacial defects towards efficient and robust CIGS photocathodes for solar water splitting journal January 2018
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Strategies for enhancing the photocurrent, photovoltage, and stability of photoelectrodes for photoelectrochemical water splitting journal January 2019
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Unbiased solar H 2 production with current density up to 23 mA cm −2 by Swiss-cheese black Si coupled with wastewater bioanode journal January 2019
Aluminum-incorporated p-CuO/n-ZnO photocathode coated with nanocrystal-engineered TiO 2 protective layer for photoelectrochemical water splitting and hydrogen generation journal January 2018
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Spontaneous full photocatalytic water splitting on 2D MoSe 2 /SnSe 2 and WSe 2 /SnSe 2 vdW heterostructures journal January 2019
Two-dimensional FeS 2 -encapsulated Au: a quasi-epitaxial heterojunction for synergistic catalytic activity under photoelectrocatalytic water reduction journal January 2019
Surface chemistry and photoelectrochemistry—Case study on tantalum nitride journal October 2019
NiFeP nanoflakes composite with CoP on carbon cloth as flexible and durable electrocatalyst for efficient overall water splitting journal September 2019
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