Topotactic Transformations in an Icosahedral Nanocrystal to Form Efficient Water-Splitting Catalysts

Aram Oh; Ho Young Kim; Hionsuck Baik; Byeongyoon Kim; Nitin Kaduba Chaudhari; Sang Hoon Joo; Kwangyeol Lee

doi:10.1002/adma.201805546

Topotactic Transformations in an Icosahedral Nanocrystal to Form Efficient Water-Splitting Catalysts

Aram Oh, Ho Young Kim, Hionsuck Baik, Byeongyoon Kim, Nitin Kaduba Chaudhari, Sang Hoon Joo, Kwangyeol Lee

Department of Chemistry

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

88 Citations (Scopus)

Abstract

Designing high-performance, precious-metal-based, and economic electrocatalysts remains an important challenge in proton exchange membrane (PEM) electrolyzers. Here, a highly active and durable bifunctional electrocatalyst for PEM electrolyzers based on a rattle-like catalyst comprising a Ni/Ru-doped Pt core and a Pt/Ni-doped RuO₂ frame shell, which is topotactically transformed from an icosahedral Pt/Ni/Ru nanocrystal, is reported. The RuO₂-based frame shell with its highly reactive surfaces leads to a very high activity for the oxygen evolution reaction (OER) in acidic media, reaching a current density of 10 mA cm⁻² at an overpotential of 239 mV, which surpasses those of previously reported catalysts. The Pt dopant in the RuO₂ shell enables a sustained OER activity even after a 2000 cycles of an accelerated durability test. The Pt-based core catalyzes the hydrogen evolution reaction with an excellent mass activity. A two-electrode cell employing Pt/RuO₂ as the electrode catalyst demonstrates very high activity and durability, outperforming the previously reported cell performances.

Original language	English
Article number	1805546
Journal	Advanced Materials
Volume	31
Issue number	1
DOIs	https://doi.org/10.1002/adma.201805546
Publication status	Published - 2019 Jan 4

Bibliographical note

Funding Information:
A.O., H.Y.K., and H.B. contributed equally to this work. This research was supported by the Basic Science Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1A2B3005682, NRF-2017R1A6A3A01008861, NRF-2017R1A2B2008464, and NRF-2017R1A4A1015533), the Korea Basic Science Institute project (E38300 and C38530), and Korea University Future Research Grant (KU-FRG). The authors thank Kyungsik Nam for assisting in the synthesis of nanocatalysts.

Publisher Copyright:
© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Keywords

bifunctional electrocatalysis
icosahedral nanocrystals
nanoframes
platinum–nickel–ruthenium ternary alloys
water splitting

ASJC Scopus subject areas

General Materials Science
Mechanics of Materials
Mechanical Engineering

UN SDGs

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

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10.1002/adma.201805546

Cite this

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title = "Topotactic Transformations in an Icosahedral Nanocrystal to Form Efficient Water-Splitting Catalysts",

abstract = "Designing high-performance, precious-metal-based, and economic electrocatalysts remains an important challenge in proton exchange membrane (PEM) electrolyzers. Here, a highly active and durable bifunctional electrocatalyst for PEM electrolyzers based on a rattle-like catalyst comprising a Ni/Ru-doped Pt core and a Pt/Ni-doped RuO2 frame shell, which is topotactically transformed from an icosahedral Pt/Ni/Ru nanocrystal, is reported. The RuO2-based frame shell with its highly reactive surfaces leads to a very high activity for the oxygen evolution reaction (OER) in acidic media, reaching a current density of 10 mA cm−2 at an overpotential of 239 mV, which surpasses those of previously reported catalysts. The Pt dopant in the RuO2 shell enables a sustained OER activity even after a 2000 cycles of an accelerated durability test. The Pt-based core catalyzes the hydrogen evolution reaction with an excellent mass activity. A two-electrode cell employing Pt/RuO2 as the electrode catalyst demonstrates very high activity and durability, outperforming the previously reported cell performances.",

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note = "Funding Information: A.O., H.Y.K., and H.B. contributed equally to this work. This research was supported by the Basic Science Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2017R1A2B3005682, NRF-2017R1A6A3A01008861, NRF-2017R1A2B2008464, and NRF-2017R1A4A1015533), the Korea Basic Science Institute project (E38300 and C38530), and Korea University Future Research Grant (KU-FRG). The authors thank Kyungsik Nam for assisting in the synthesis of nanocatalysts. Publisher Copyright: {\textcopyright} 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim",

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AU - Lee, Kwangyeol

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Topotactic Transformations in an Icosahedral Nanocrystal to Form Efficient Water-Splitting Catalysts

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

UN SDGs

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