Leveraging metal alloy-hybrid support interaction to enhance oxygen evolution kinetics and stability in proton exchange membrane water electrolyzers

In Gyeom Kim; Ahyoun Lim; Jong Hyun Jang; Kwan Young Lee; In Wook Nah; Sehkyu Park

doi:10.1016/j.jpowsour.2021.230002

Leveraging metal alloy-hybrid support interaction to enhance oxygen evolution kinetics and stability in proton exchange membrane water electrolyzers

In Gyeom Kim, Ahyoun Lim, Jong Hyun Jang, Kwan Young Lee, In Wook Nah, Sehkyu Park

Department of Chemical and Biological Engineering

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

9 Citations (Scopus)

Abstract

This study presents the unprecedented high OER performance of binary iridium (Ir) and ruthenium (Ru) nanoparticles on TiO₂-oxide-decorated reduced graphene oxide (rGO) in acidic media. IrRu alloy electrocatalysts supported on TiO₂-rGO (denoted as IrRu/TG) were prepared via ultrasonic spray pyrolysis, followed by the polyol method. TiO₂-rGO (TG) support is used not only to disperse IrRu nanoparticles effectively but also to induce the electronic modulation of Ir by downshifting its d-band center compared to unsupported catalysts. IrRu/TG exhibits optimal OER performances and high stability when the weight ratio of TiO₂:rGO is 90:10 (i.e., T₉₀G₁₀). The successfully synthesized IrRu/T₉₀G₁₀ exhibits remarkable OER activity, requiring a low overpotential of 254 mV to reach 10 mA cm⁻² compare with the unsupported IrRuO_x (372 mV), IrRu/rGO (325 mV), and commercial Ir black (340 mV). Moreover, TiO₂-rGO (TG) support inhibits the aggregation and oxidative dissolution of IrRu species, thereby enhancing the stability in acidic media. In proton exchange membrane water electrolyzer (PEMWE) tests using membrane electrode assemblies (MEAs), IrRu/T₉₀G₁₀ shows more than twice the mass activity of commercial IrO₂.

Original language	English
Article number	230002
Journal	Journal of Power Sources
Volume	501
DOIs	https://doi.org/10.1016/j.jpowsour.2021.230002
Publication status	Published - 2021 Jul 31

Keywords

Electrocatalysts
Iridium (ir)
Oxygen evolution reaction
Proton exchange membrane water electrolysis
Ruthenium (ru)
Spray pyrolysis
TiO-Reduced graphene oxide (TG)

ASJC Scopus subject areas

Renewable Energy, Sustainability and the Environment
Energy Engineering and Power Technology
Physical and Theoretical Chemistry
Electrical and Electronic Engineering

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jpowsour.2021.230002

Cite this

@article{c18f5d1437b04f46910800a55fba7772,

title = "Leveraging metal alloy-hybrid support interaction to enhance oxygen evolution kinetics and stability in proton exchange membrane water electrolyzers",

abstract = "This study presents the unprecedented high OER performance of binary iridium (Ir) and ruthenium (Ru) nanoparticles on TiO2-oxide-decorated reduced graphene oxide (rGO) in acidic media. IrRu alloy electrocatalysts supported on TiO2-rGO (denoted as IrRu/TG) were prepared via ultrasonic spray pyrolysis, followed by the polyol method. TiO2-rGO (TG) support is used not only to disperse IrRu nanoparticles effectively but also to induce the electronic modulation of Ir by downshifting its d-band center compared to unsupported catalysts. IrRu/TG exhibits optimal OER performances and high stability when the weight ratio of TiO2:rGO is 90:10 (i.e., T90G10). The successfully synthesized IrRu/T90G10 exhibits remarkable OER activity, requiring a low overpotential of 254 mV to reach 10 mA cm−2 compare with the unsupported IrRuOx (372 mV), IrRu/rGO (325 mV), and commercial Ir black (340 mV). Moreover, TiO2-rGO (TG) support inhibits the aggregation and oxidative dissolution of IrRu species, thereby enhancing the stability in acidic media. In proton exchange membrane water electrolyzer (PEMWE) tests using membrane electrode assemblies (MEAs), IrRu/T90G10 shows more than twice the mass activity of commercial IrO2.",

keywords = "Electrocatalysts, Iridium (ir), Oxygen evolution reaction, Proton exchange membrane water electrolysis, Ruthenium (ru), Spray pyrolysis, TiO-Reduced graphene oxide (TG)",

author = "Kim, {In Gyeom} and Ahyoun Lim and Jang, {Jong Hyun} and Lee, {Kwan Young} and Nah, {In Wook} and Sehkyu Park",

note = "Funding Information: Financial support from the National Research Foundation of Korea ( NRF ) grant funded by the Korean government ( MSIT ) (No. 2019R1A2C1085095 & No. 2019M3E6A1064708 ) is gratefully acknowledged. This work has been also conducted by the excellent research support project of Kwangwoon University in 2021. Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",

year = "2021",

month = jul,

day = "31",

doi = "10.1016/j.jpowsour.2021.230002",

language = "English",

volume = "501",

journal = "Journal of Power Sources",

issn = "0378-7753",

publisher = "Elsevier",

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TY - JOUR

T1 - Leveraging metal alloy-hybrid support interaction to enhance oxygen evolution kinetics and stability in proton exchange membrane water electrolyzers

AU - Kim, In Gyeom

AU - Lim, Ahyoun

AU - Jang, Jong Hyun

AU - Lee, Kwan Young

AU - Nah, In Wook

AU - Park, Sehkyu

N1 - Funding Information: Financial support from the National Research Foundation of Korea ( NRF ) grant funded by the Korean government ( MSIT ) (No. 2019R1A2C1085095 & No. 2019M3E6A1064708 ) is gratefully acknowledged. This work has been also conducted by the excellent research support project of Kwangwoon University in 2021. Publisher Copyright: © 2021 Elsevier B.V.

PY - 2021/7/31

Y1 - 2021/7/31

N2 - This study presents the unprecedented high OER performance of binary iridium (Ir) and ruthenium (Ru) nanoparticles on TiO2-oxide-decorated reduced graphene oxide (rGO) in acidic media. IrRu alloy electrocatalysts supported on TiO2-rGO (denoted as IrRu/TG) were prepared via ultrasonic spray pyrolysis, followed by the polyol method. TiO2-rGO (TG) support is used not only to disperse IrRu nanoparticles effectively but also to induce the electronic modulation of Ir by downshifting its d-band center compared to unsupported catalysts. IrRu/TG exhibits optimal OER performances and high stability when the weight ratio of TiO2:rGO is 90:10 (i.e., T90G10). The successfully synthesized IrRu/T90G10 exhibits remarkable OER activity, requiring a low overpotential of 254 mV to reach 10 mA cm−2 compare with the unsupported IrRuOx (372 mV), IrRu/rGO (325 mV), and commercial Ir black (340 mV). Moreover, TiO2-rGO (TG) support inhibits the aggregation and oxidative dissolution of IrRu species, thereby enhancing the stability in acidic media. In proton exchange membrane water electrolyzer (PEMWE) tests using membrane electrode assemblies (MEAs), IrRu/T90G10 shows more than twice the mass activity of commercial IrO2.

AB - This study presents the unprecedented high OER performance of binary iridium (Ir) and ruthenium (Ru) nanoparticles on TiO2-oxide-decorated reduced graphene oxide (rGO) in acidic media. IrRu alloy electrocatalysts supported on TiO2-rGO (denoted as IrRu/TG) were prepared via ultrasonic spray pyrolysis, followed by the polyol method. TiO2-rGO (TG) support is used not only to disperse IrRu nanoparticles effectively but also to induce the electronic modulation of Ir by downshifting its d-band center compared to unsupported catalysts. IrRu/TG exhibits optimal OER performances and high stability when the weight ratio of TiO2:rGO is 90:10 (i.e., T90G10). The successfully synthesized IrRu/T90G10 exhibits remarkable OER activity, requiring a low overpotential of 254 mV to reach 10 mA cm−2 compare with the unsupported IrRuOx (372 mV), IrRu/rGO (325 mV), and commercial Ir black (340 mV). Moreover, TiO2-rGO (TG) support inhibits the aggregation and oxidative dissolution of IrRu species, thereby enhancing the stability in acidic media. In proton exchange membrane water electrolyzer (PEMWE) tests using membrane electrode assemblies (MEAs), IrRu/T90G10 shows more than twice the mass activity of commercial IrO2.

KW - Electrocatalysts

KW - Iridium (ir)

KW - Oxygen evolution reaction

KW - Proton exchange membrane water electrolysis

KW - Ruthenium (ru)

KW - Spray pyrolysis

KW - TiO-Reduced graphene oxide (TG)

UR - http://www.scopus.com/inward/record.url?scp=85105592008&partnerID=8YFLogxK

U2 - 10.1016/j.jpowsour.2021.230002

DO - 10.1016/j.jpowsour.2021.230002

M3 - Article

AN - SCOPUS:85105592008

SN - 0378-7753

VL - 501

JO - Journal of Power Sources

JF - Journal of Power Sources

M1 - 230002

ER -

Leveraging metal alloy-hybrid support interaction to enhance oxygen evolution kinetics and stability in proton exchange membrane water electrolyzers

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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