Unassisted Water Splitting Using a GaSbxP(1-x) Photoanode

Martinez-Garcia, Alejandro; Russell, Harry B.; Paxton, William; Ravipati, Srikanth; Calero-Barney, Sonia; Menon, Madhu; Richter, Ernst; Young, James; Deutsch, Todd; Sunkara, Mahendra K.

doi:10.1002/aenm.201703247

Title: Unassisted Water Splitting Using a GaSb_xP_(1-_x₎ Photoanode

Journal Article · 21 February 2018 · Advanced Energy Materials

DOI: https://doi.org/10.1002/aenm.201703247 · OSTI ID:1426640

Martinez-Garcia, Alejandro ^[1]; Russell, Harry B. ^[1]; Paxton, William ^[2]; Ravipati, Srikanth ^[2]; Calero-Barney, Sonia ^[1]; Menon, Madhu ^[3]; Richter, Ernst ^[4]; Young, James ^[5]; Deutsch, Todd ^[5]; Sunkara, Mahendra K. ^[6]

Univ. of Louisville, KY (United States). Department of Chemical Engineering
Univ. of Louisville, KY (United States). Conn Center for Renewable Energy Research
Univ. of Louisville, KY (United States). Center for Computational Sciences
Daimler AG, RD/EKB, Ulm (Germany)
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Univ. of Louisville, KY (United States). Department of Chemical Engineering and Conn Center for Renewable Energy Research

Abstract Here, unbiased water splitting with 2% solar‐to‐hydrogen efficiency under AM 1.5 G illumination using new materials based on GaSb _0.03 P _0.97 alloy is reported. Freestanding GaSb _x P ₁₋ _x is grown using halide vapor phase epitaxy. The native conductivity type of the alloy is modified by silicon doping, resulting in an open‐circuit potential (OCP) of 750 mV, photocurrents of 7 mA cm ⁻² at 10 sun illumination, and corrosion resistance in an aqueous acidic environment. Alloying GaP with Sb at 3 at% improves the absorption of high‐energy photons above 2.68 eV compared to pure GaP material. Electrochemical Impedance Spectroscopy and illuminated OCP measurements show that the conduction band of GaSb _x P ₁₋ _x is at −0.55 V versus RHE irrespective of the Sb concentration, while photocurrent spectroscopy indicates that only radiation with photon energies greater than 2.68 eV generate mobile and extractable charges, thus suggesting that the higher‐laying conduction bands in the Γ 1 valley of the alloys are responsible for exciton generation.

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Research Organization:: National Renewable Energy Laboratory (NREL), Golden, CO (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation and Fuels. Hydrogen and Fuel Cell Technologies Office (HFTO); USDOE

Grant/Contract Number:: AC36-08GO28308; DE‐AC36‐08GO28308

OSTI ID:: 1426640

Alternate ID(s):: OSTI ID: 1422018

Report Number(s):: NREL/JA-5900-70812

Journal Information:: Advanced Energy Materials, Vol. 8, Issue 16; ISSN 1614-6832

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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