Comprehensive Evaluation of CuBi2O4 as a Photocathode Material for Photoelectrochemical Water Splitting

Sean P. Berglund; Fatwa F. Abdi; Peter Bogdanoff; Abdelkrim Chemseddine; Dennis Friedrich; Roel Van De Krol

doi:10.1021/acs.chemmater.6b00830

Comprehensive Evaluation of CuBi₂O₄ as a Photocathode Material for Photoelectrochemical Water Splitting

Sean P. Berglund^*
, Fatwa F. Abdi
, Peter Bogdanoff
, Abdelkrim Chemseddine
, Dennis Friedrich
, Roel Van De Krol

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

342 Citations (Scopus)

Abstract

CuBi₂O₄ is a multinary p-type semiconductor that has recently been identified as a promising photocathode material for photoelectrochemical (PEC) water splitting. It has an optimal bandgap energy (∼1.8 eV) and an exceptionally positive photocurrent onset potential (>1 V vs RHE), making it an ideal candidate for the top absorber in a dual absorber PEC device. However, photocathodes made from CuBi₂O₄ have not yet demonstrated high photoconversion efficiencies, and the factors that limit the efficiency have not yet been fully identified. In this work we characterize CuBi₂O₄ photocathodes synthesized by a straightforward drop-casting procedure and for the first time report many of the quintessential material properties that are relevant to PEC water splitting. Our results provide important insights into the limitations of CuBi₂O₄ in regards to optical absorption, charge carrier transport, reaction kinetics, and stability. This information will be valuable in future work to optimize CuBi₂O₄ as a PEC material. In addition, we report new benchmark photocurrent density and IPCE values for CuBi₂O₄ photocathodes. © 2016 American Chemical Society.

Original language	English
Pages (from-to)	4231-4242
Journal	Chemistry of Materials
Volume	28
Issue number	12
DOIs	https://doi.org/10.1021/acs.chemmater.6b00830
Publication status	Published - 28 Jun 2016
Externally published	Yes

Bibliographical note

Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].

Funding

Part of this work is supported by the German Bundesministerium für Bildung and Forschung (BMBF), project “MeOx4H2” (03SF0478A).

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Cite this

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abstract = "CuBi2O4 is a multinary p-type semiconductor that has recently been identified as a promising photocathode material for photoelectrochemical (PEC) water splitting. It has an optimal bandgap energy (∼1.8 eV) and an exceptionally positive photocurrent onset potential (>1 V vs RHE), making it an ideal candidate for the top absorber in a dual absorber PEC device. However, photocathodes made from CuBi2O4 have not yet demonstrated high photoconversion efficiencies, and the factors that limit the efficiency have not yet been fully identified. In this work we characterize CuBi2O4 photocathodes synthesized by a straightforward drop-casting procedure and for the first time report many of the quintessential material properties that are relevant to PEC water splitting. Our results provide important insights into the limitations of CuBi2O4 in regards to optical absorption, charge carrier transport, reaction kinetics, and stability. This information will be valuable in future work to optimize CuBi2O4 as a PEC material. In addition, we report new benchmark photocurrent density and IPCE values for CuBi2O4 photocathodes. {\textcopyright} 2016 American Chemical Society.",

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AU - Friedrich, Dennis

AU - Van De Krol, Roel

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