DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Investigations of the stability of etched or platinized p-InP(100) photocathodes for solar-driven hydrogen evolution in acidic or alkaline aqueous electrolytes

Journal Article · · Energy & Environmental Science
DOI: https://doi.org/10.1039/d1ee02809j · OSTI ID:1978784

Here, the stability of p-InP photocathodes performing the hydrogen-evolution reaction (HER) has been evaluated in contact with either 1.0 M H2SO4(aq) or 1.0 M KOH(aq), with a focus on identifying corrosion mechanisms. Stability for the solar-driven HER was evaluated using p-InP electrodes that were either etched or coated with an electrodeposited Pt catalyst (p-InP/Pt). Variables such as trace O2 were systematically controlled during the measurements. Changes in surface characteristics after exposure to electrochemical conditions as well as electrode dissolution processes were monitored using X-ray photoelectron spectroscopy (XPS) and inductively coupled plasma mass spectrometry (ICP-MS). In either H2SO4 or KOH, etched p-InP photoelectrodes corroded cathodically under illumination, forming metallic In0 at the electrode surface. In contrast, electrodeposition of Pt kinetically stabilized illuminated p-InP photocathodes in both H2SO4 and KOH by inhibiting the cathodic corrosion pathway. Notably, when held at 0 V vs. the reversible hydrogen electrode (RHE) in 1.0 M H2SO4(aq), p-InP/Pt exhibited a stable current density (J) of ~–18 mA cm–2 for >285 h under simulated 1 Sun illumination. The long-term current density vs. potential (J–E) behavior at pH 0 and pH 14 of p-InP/Pt photocathodes correlated with changes in the surface chemistry as well as the dissolution of p-InP. In acidic media, the J–E behavior of p-InP/Pt photocathodes remained nearly constant with time, but the surface of a p-InP/Pt electrodes gradually turned P-rich via a slow and continuous leaching of In ions. In alkaline electrolyte, the surface of p-InP/Pt electrodes was passivated by formation of an InOx layer that exhibited negligible dissolution but led to a substantial degradation in the J–E characteristics. Consequently, changes in the catalytic kinetics and surface stoichiometry are both important considerations for determining the corrosion chemistry and the long-term operational stability of InP photoelectrodes.

Research Organization:
California Institute of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0004993; SC0022087
OSTI ID:
1978784
Alternate ID(s):
OSTI ID: 1825953
Journal Information:
Energy & Environmental Science, Journal Name: Energy & Environmental Science Journal Issue: 11 Vol. 14; ISSN 1754-5692
Publisher:
Royal Society of ChemistryCopyright Statement
Country of Publication:
United States
Language:
English

References (51)

Semiconductor–Electrocatalyst Interfaces: Theory, Experiment, and Applications in Photoelectrochemical Water Splitting journal April 2016
Electrolytic decomposition and photodecomposition of compound semiconductors in contact with electrolytes journal July 1978
Thermodynamic Potential for the Anodic Dissolution of n-Type Semiconductors journal January 1977
Unified defect model and beyond journal September 1980
CoP as an Acid-Stable Active Electrocatalyst for the Hydrogen-Evolution Reaction: Electrochemical Synthesis, Interfacial Characterization and Performance Evaluation journal October 2014
Stable Solar-Driven Water Oxidation to O 2 (g) by Ni-Oxide-Coated Silicon Photoanodes journal January 2015
Nickel–Iron Oxyhydroxide Oxygen-Evolution Electrocatalysts: The Role of Intentional and Incidental Iron Incorporation journal April 2014
11.5% solar conversion efficiency in the photocathodically protected p ‐InP/V 3+ ‐V 2+ ‐HCI/C semiconductor liquid junction cell journal February 1981
Direct solar-to-hydrogen conversion via inverted metamorphic multi-junction semiconductor architectures journal March 2017
Hydrogen-Evolving Solar Cells journal March 1984
The advanced unified defect model for Schottky barrier formation journal July 1988
On the origin of the photocurrent of electrochemically passivated p-InP(100) photoelectrodes journal January 2018
A monolithically integrated, intrinsically safe, 10% efficient, solar-driven water-splitting system based on active, stable earth-abundant electrocatalysts in conjunction with tandem III–V light absorbers protected by amorphous TiO 2 films journal January 2015
Thermodynamic Oxidation and Reduction Potentials of Photocatalytic Semiconductors in Aqueous Solution journal September 2012
An experimental and modeling/simulation-based evaluation of the efficiency and operational performance characteristics of an integrated, membrane-free, neutral pH solar-driven water-splitting system journal January 2014
Over 18% solar energy conversion to generation of hydrogen fuel; theory and experiment for efficient solar water splitting journal July 2001
Adaptive semiconductor/electrocatalyst junctions in water-splitting photoanodes journal December 2013
Commentary: The Materials Project: A materials genome approach to accelerating materials innovation journal July 2013
Comparison of the device physics principles of planar and radial p-n junction nanorod solar cells journal June 2005
A Monolithic Photovoltaic-Photoelectrochemical Device for Hydrogen Production via Water Splitting journal April 1998
Junction behavior of n-Si photoanodes protected by thin Ni elucidated from dual working electrode photoelectrochemistry journal January 2017
Building a Six-Junction Inverted Metamorphic Concentrator Solar Cell journal March 2018
p-Type InP Nanopillar Photocathodes for Efficient Solar-Driven Hydrogen Production journal September 2012
Efficient Solar to Chemical Conversion: 12% Efficient Photoassisted Electrolysis in the [ p -type InP(Ru)]/HCl-KCl/Pt(Rh) Cell journal April 1981
High-Efficiency InP-Based Photocathode for Hydrogen Production by Interface Energetics Design and Photon Management journal December 2015
Monolithic Photoelectrochemical Device for Direct Water Splitting with 19% Efficiency journal June 2018
Nonepitaxial Thin-Film InP for Scalable and Efficient Photocathodes journal May 2015
An analysis of the optimal band gaps of light absorbers in integrated tandem photoelectrochemical water-splitting systems journal January 2013
Combined photoelectrochemical conditioning and surface analysis of InP photocathodes journal June 2002
Structures and properties of electron‐beam‐evaporated indium tin oxide films as studied by x‐ray photoelectron spectroscopy and work‐function measurements journal May 1993
Chemical bath deposition of indium hydroxy sulphide thin films: process and XPS characterization journal September 1999
The oxidation and surface speciation of indium and indium oxides exposed to atmospheric oxidants journal June 2016
Addressing the Stability Gap in Photoelectrochemistry: Molybdenum Disulfide Protective Catalysts for Tandem III–V Unassisted Solar Water Splitting journal July 2020
Role of TiO 2 Surface Passivation on Improving the Performance of p-InP Photocathodes journal February 2015
An x-ray photoelectron spectroscopy study of the valence band structure of indium oxides journal January 1989
A New Inlet System for Differential Electrochemical Mass Spectroscopy Applied to the Photocorrosion of p-InP(111) Single Crystals journal January 1998
An efficient photocathode for semiconductor liquid junction cells: 9.4% solar conversion efficiency with p-InP/VCl3-VCl2-HCl/C journal October 1980
Optical in Situ Study of InP(100) Surface Chemistry: Dissociative Adsorption of Water and Oxygen journal August 2014
Efficient direct solar-to-hydrogen conversion by in situ interface transformation of a tandem structure journal September 2015
Unified Mechanism for Schottky-Barrier Formation and III-V Oxide Interface States journal February 1980
Prediction of solid-aqueous equilibria: Scheme to combine first-principles calculations of solids with experimental aqueous states journal June 2012
Combined photoelectrochemical conditioning and photoelectron spectroscopy analysis of InP photocathodes. I. The modification procedure journal June 2002
Efficient p-InP(Rh-H alloy) and p-InP(Re-H alloy) Hydrogen Evolving Photocathodes journal January 1982
Photoelectrocatalysis: principles, nanoemitter applications and routes to bio-inspired systems journal January 2010
Hydrogen-evolving semiconductor photocathodes: nature of the junction and function of the platinum group metal catalyst journal December 1982
An electrochemical engineering assessment of the operational conditions and constraints for solar-driven water-splitting systems at near-neutral pH journal January 2015
Electrochemical Stability of Metastable Materials journal November 2017
Benchmarking Hydrogen Evolving Reaction and Oxygen Evolving Reaction Electrocatalysts for Solar Water Splitting Devices journal March 2015
Enhanced Carbon Dioxide Reduction Activity on Indium-Based Nanoparticles journal January 2016
A thermally synergistic photo-electrochemical hydrogen generator operating under concentrated solar irradiation journal April 2019
XPS and AFM studies of surface chemistry and morphology of In2O3 ultrathin films deposited by rheotaxial growth and vacuum oxidation journal November 2011