Photo-electrochemical oxygen evolution reaction by biomimetic CaMn2O4 catalyst

Ankita Gagrani; Mohammed Alsultan; Gerhard F. Swiegers; Takuya Tsuzuki

doi:10.3390/app9112196

Photo-electrochemical oxygen evolution reaction by biomimetic CaMn₂O₄ catalyst

Ankita Gagrani, Mohammed Alsultan, Gerhard F. Swiegers^*, Takuya Tsuzuki

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

Calcium manganese oxide catalysts are a new class of redox catalysts with significant importance because of their structural similarity to natural oxygen-evolving complex in plant cells and the earth-abundant elemental constituents. In the present study, the photo-electrocatalytic properties of CaMn₂O₄ in water-splitting were investigated. CaMn₂O₄ powders with irregular shapes and nanowire shapes were synthesised using mechanochemical processing and a hydrothermal method, respectively. The anode in a photo-electrochemical cell was fabricated by embedding CaMn₂O₄ powders within polypyrrole. The results showed that CaMn₂O₄ induced a higher dark and light current in comparison to the control sample (polypyrrole alone). CaMn₂O₄ nanowires exhibited higher dark and light current in comparison to irregular-shaped CaMn₂O₄ powders. The difference was attributable to the higher surface area of nanowires compared to the irregular-shaped particles, rather than the difference in exposed crystal facets.

Original language	English
Article number	2196
Journal	Applied Sciences (Switzerland)
Volume	9
Issue number	11
DOIs	https://doi.org/10.3390/app9112196
Publication status	Published - 1 Jun 2019

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title = "Photo-electrochemical oxygen evolution reaction by biomimetic CaMn2O4 catalyst",

abstract = "Calcium manganese oxide catalysts are a new class of redox catalysts with significant importance because of their structural similarity to natural oxygen-evolving complex in plant cells and the earth-abundant elemental constituents. In the present study, the photo-electrocatalytic properties of CaMn2O4 in water-splitting were investigated. CaMn2O4 powders with irregular shapes and nanowire shapes were synthesised using mechanochemical processing and a hydrothermal method, respectively. The anode in a photo-electrochemical cell was fabricated by embedding CaMn2O4 powders within polypyrrole. The results showed that CaMn2O4 induced a higher dark and light current in comparison to the control sample (polypyrrole alone). CaMn2O4 nanowires exhibited higher dark and light current in comparison to irregular-shaped CaMn2O4 powders. The difference was attributable to the higher surface area of nanowires compared to the irregular-shaped particles, rather than the difference in exposed crystal facets.",

keywords = "Calcium manganese oxide, Morphology, Water splitting",

author = "Ankita Gagrani and Mohammed Alsultan and Swiegers, {Gerhard F.} and Takuya Tsuzuki",

note = "Publisher Copyright: {\textcopyright} 2019 by the authors.",

year = "2019",

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doi = "10.3390/app9112196",

language = "English",

volume = "9",

journal = "Applied Sciences (Switzerland)",

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T1 - Photo-electrochemical oxygen evolution reaction by biomimetic CaMn2O4 catalyst

AU - Gagrani, Ankita

AU - Alsultan, Mohammed

AU - Swiegers, Gerhard F.

AU - Tsuzuki, Takuya

PY - 2019/6/1

Y1 - 2019/6/1

N2 - Calcium manganese oxide catalysts are a new class of redox catalysts with significant importance because of their structural similarity to natural oxygen-evolving complex in plant cells and the earth-abundant elemental constituents. In the present study, the photo-electrocatalytic properties of CaMn2O4 in water-splitting were investigated. CaMn2O4 powders with irregular shapes and nanowire shapes were synthesised using mechanochemical processing and a hydrothermal method, respectively. The anode in a photo-electrochemical cell was fabricated by embedding CaMn2O4 powders within polypyrrole. The results showed that CaMn2O4 induced a higher dark and light current in comparison to the control sample (polypyrrole alone). CaMn2O4 nanowires exhibited higher dark and light current in comparison to irregular-shaped CaMn2O4 powders. The difference was attributable to the higher surface area of nanowires compared to the irregular-shaped particles, rather than the difference in exposed crystal facets.

AB - Calcium manganese oxide catalysts are a new class of redox catalysts with significant importance because of their structural similarity to natural oxygen-evolving complex in plant cells and the earth-abundant elemental constituents. In the present study, the photo-electrocatalytic properties of CaMn2O4 in water-splitting were investigated. CaMn2O4 powders with irregular shapes and nanowire shapes were synthesised using mechanochemical processing and a hydrothermal method, respectively. The anode in a photo-electrochemical cell was fabricated by embedding CaMn2O4 powders within polypyrrole. The results showed that CaMn2O4 induced a higher dark and light current in comparison to the control sample (polypyrrole alone). CaMn2O4 nanowires exhibited higher dark and light current in comparison to irregular-shaped CaMn2O4 powders. The difference was attributable to the higher surface area of nanowires compared to the irregular-shaped particles, rather than the difference in exposed crystal facets.

KW - Calcium manganese oxide

KW - Morphology

KW - Water splitting

UR - http://www.scopus.com/inward/record.url?scp=85067265604&partnerID=8YFLogxK

U2 - 10.3390/app9112196

DO - 10.3390/app9112196

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JO - Applied Sciences (Switzerland)

JF - Applied Sciences (Switzerland)

IS - 11

M1 - 2196

ER -

Photo-electrochemical oxygen evolution reaction by biomimetic CaMn₂O₄ catalyst

Abstract

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