Bifunctional Multiferroic GdCrO3 Nanoassemblies for Sustainable H2 Production Using Electro- and Photocatalysis

Huma Khan; Samuel E. Lofland; Kandalam V. Ramanujachary; Norah Alhokbany; Tokeer Ahmad

doi:10.1021/acsaem.3c01210

Bifunctional Multiferroic GdCrO₃ Nanoassemblies for Sustainable H₂ Production Using Electro- and Photocatalysis

Huma Khan, Samuel E. Lofland, Kandalam V. Ramanujachary, Norah Alhokbany, Tokeer Ahmad

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

24 Scopus citations

Abstract

In the realm of energy storage and conversion powered by electro- or photocatalysts, tremendous efforts are devoted on producing effective and long-lasting oxide catalysts. Here, we demonstrate multiferroic GdCrO₃ nanoassemblies synthesized using a solvothermal method. X-ray diffraction (XRD) and XPS studies confirm the orthorhombic formation of GdCrO₃. Scanning and high-resolution transmission electron microscopy shows the formation of nanoassemblies. Ferroelectric study reveals the remnant polarization of 2.36 μC cm^-2 and oxygen vacancies. In an alkaline media, GdCrO₃ nanoassemblies act as an efficacious and resilient oxygen evolution reaction electrocatalyst by showing superior specific activity. Photocatalytic H₂ evolution studies show a high H₂ evolution rate of 2 mmol h^-1 g_cat^-1 and an apparent quantum yield of 23.2%. The mechanism for significant H₂ generation is established by internal electric field-associated charge transfer, as confirmed by XPS measurements.

Original language	English (US)
Pages (from-to)	8102-8110
Number of pages	9
Journal	ACS Applied Energy Materials
Volume	6
Issue number	15
DOIs	https://doi.org/10.1021/acsaem.3c01210
State	Published - Aug 14 2023

All Science Journal Classification (ASJC) codes

Chemical Engineering (miscellaneous)
Energy Engineering and Power Technology
Electrochemistry
Materials Chemistry
Electrical and Electronic Engineering

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10.1021/acsaem.3c01210

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title = "Bifunctional Multiferroic GdCrO3 Nanoassemblies for Sustainable H2 Production Using Electro- and Photocatalysis",

abstract = "In the realm of energy storage and conversion powered by electro- or photocatalysts, tremendous efforts are devoted on producing effective and long-lasting oxide catalysts. Here, we demonstrate multiferroic GdCrO3 nanoassemblies synthesized using a solvothermal method. X-ray diffraction (XRD) and XPS studies confirm the orthorhombic formation of GdCrO3. Scanning and high-resolution transmission electron microscopy shows the formation of nanoassemblies. Ferroelectric study reveals the remnant polarization of 2.36 μC cm-2 and oxygen vacancies. In an alkaline media, GdCrO3 nanoassemblies act as an efficacious and resilient oxygen evolution reaction electrocatalyst by showing superior specific activity. Photocatalytic H2 evolution studies show a high H2 evolution rate of 2 mmol h-1 gcat-1 and an apparent quantum yield of 23.2%. The mechanism for significant H2 generation is established by internal electric field-associated charge transfer, as confirmed by XPS measurements.",

author = "Huma Khan and Lofland, {Samuel E.} and Ramanujachary, {Kandalam V.} and Norah Alhokbany and Tokeer Ahmad",

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AU - Khan, Huma

AU - Lofland, Samuel E.

AU - Ramanujachary, Kandalam V.

AU - Alhokbany, Norah

AU - Ahmad, Tokeer

PY - 2023/8/14

Y1 - 2023/8/14

N2 - In the realm of energy storage and conversion powered by electro- or photocatalysts, tremendous efforts are devoted on producing effective and long-lasting oxide catalysts. Here, we demonstrate multiferroic GdCrO3 nanoassemblies synthesized using a solvothermal method. X-ray diffraction (XRD) and XPS studies confirm the orthorhombic formation of GdCrO3. Scanning and high-resolution transmission electron microscopy shows the formation of nanoassemblies. Ferroelectric study reveals the remnant polarization of 2.36 μC cm-2 and oxygen vacancies. In an alkaline media, GdCrO3 nanoassemblies act as an efficacious and resilient oxygen evolution reaction electrocatalyst by showing superior specific activity. Photocatalytic H2 evolution studies show a high H2 evolution rate of 2 mmol h-1 gcat-1 and an apparent quantum yield of 23.2%. The mechanism for significant H2 generation is established by internal electric field-associated charge transfer, as confirmed by XPS measurements.

AB - In the realm of energy storage and conversion powered by electro- or photocatalysts, tremendous efforts are devoted on producing effective and long-lasting oxide catalysts. Here, we demonstrate multiferroic GdCrO3 nanoassemblies synthesized using a solvothermal method. X-ray diffraction (XRD) and XPS studies confirm the orthorhombic formation of GdCrO3. Scanning and high-resolution transmission electron microscopy shows the formation of nanoassemblies. Ferroelectric study reveals the remnant polarization of 2.36 μC cm-2 and oxygen vacancies. In an alkaline media, GdCrO3 nanoassemblies act as an efficacious and resilient oxygen evolution reaction electrocatalyst by showing superior specific activity. Photocatalytic H2 evolution studies show a high H2 evolution rate of 2 mmol h-1 gcat-1 and an apparent quantum yield of 23.2%. The mechanism for significant H2 generation is established by internal electric field-associated charge transfer, as confirmed by XPS measurements.

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Bifunctional Multiferroic GdCrO₃ Nanoassemblies for Sustainable H₂ Production Using Electro- and Photocatalysis

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