Surface-Reconstructed Ru-Doped Nickel/Iron Oxyhydroxide Arrays for Efficient Oxygen Evolution

Daekyu Kim; Sumin Park; Juhyung Choi; Yuanzhe Piao; Lawrence Yoon Suk Lee

doi:10.1002/smll.202304822

Surface-Reconstructed Ru-Doped Nickel/Iron Oxyhydroxide Arrays for Efficient Oxygen Evolution

Daekyu Kim, Sumin Park, Juhyung Choi, Yuanzhe Piao, Lawrence Yoon Suk Lee

Research output: Journal article publication › Journal article › Academic research › peer-review

16 Citations (Scopus)

Abstract

The generation of an active phase through dynamic surface reconstruction is a promising strategy for improving the activity of electrocatalysts. However, studies investigating the reconstruction process and its impact on the intrinsic properties of the catalysts are scarce. Herein, the surface reconstruction of NiFe₂O₄ interfaced with NiMoO₄ (Ru–NFO/NMO) facilitated by Ru doping is reported. The electrochemical and material characterizations demonstrate that Ru doping can regulate the electronic structure of NFO/NMO and induce the high-valence state of Ni^3.6+^δ, facilitating the surface reconstruction to highly active Ru-doped NiFeOOH/NiOOH (SR-Ru–NFO/NMO). The optimized SR-Ru–NFO/NMO exhibits promising performance in the oxygen evolution reaction, displaying a low overpotential of 229 mV at 10 mA cm⁻² and good stability at varying current densities for 80 h. Density functional theory calculations indicate that Ru doping can increase the electron density and optimize intermediate adsorption by shifting the d-band center downward. This work provides valuable insights into the tuning of electrocatalysts by surface reconstruction and offers a rational design strategy for the development of highly active oxygen evolution reaction electrocatalysts.

Original language	English
Article number	2304822
Journal	Small
Volume	20
Issue number	5
DOIs	https://doi.org/10.1002/smll.202304822
Publication status	Published - 19 Sept 2023

Keywords

electronic structure modulation
heterostructures
oxygen evolution reaction
ruthenium doping
surface reconstruction

ASJC Scopus subject areas

Biotechnology
General Chemistry
Biomaterials
General Materials Science
Engineering (miscellaneous)

UN SDGs

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

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10.1002/smll.202304822

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title = "Surface-Reconstructed Ru-Doped Nickel/Iron Oxyhydroxide Arrays for Efficient Oxygen Evolution",

abstract = "The generation of an active phase through dynamic surface reconstruction is a promising strategy for improving the activity of electrocatalysts. However, studies investigating the reconstruction process and its impact on the intrinsic properties of the catalysts are scarce. Herein, the surface reconstruction of NiFe2O4 interfaced with NiMoO4 (Ru–NFO/NMO) facilitated by Ru doping is reported. The electrochemical and material characterizations demonstrate that Ru doping can regulate the electronic structure of NFO/NMO and induce the high-valence state of Ni3.6+δ, facilitating the surface reconstruction to highly active Ru-doped NiFeOOH/NiOOH (SR-Ru–NFO/NMO). The optimized SR-Ru–NFO/NMO exhibits promising performance in the oxygen evolution reaction, displaying a low overpotential of 229 mV at 10 mA cm−2 and good stability at varying current densities for 80 h. Density functional theory calculations indicate that Ru doping can increase the electron density and optimize intermediate adsorption by shifting the d-band center downward. This work provides valuable insights into the tuning of electrocatalysts by surface reconstruction and offers a rational design strategy for the development of highly active oxygen evolution reaction electrocatalysts.",

keywords = "electronic structure modulation, heterostructures, oxygen evolution reaction, ruthenium doping, surface reconstruction",

author = "Daekyu Kim and Sumin Park and Juhyung Choi and Yuanzhe Piao and Lee, \{Lawrence Yoon Suk\}",

note = "Funding Information: D.K. and S.P. contributed equally to this work. The authors acknowledge the support from the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (Grant No. 20215710100170), the Hong Kong Polytechnic University (Q‐CDAG and 1‐ZVST), and the Research Grants Council of the Hong Kong SAR (Grant No. PolyU15217521). This research was also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant No. NRF‐2022R1A6A3A01085806). D.K. acknowledges the award of the Hong Kong Ph.D. Fellowship. Publisher Copyright: {\textcopyright} 2023 Wiley-VCH GmbH.",

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AU - Kim, Daekyu

AU - Park, Sumin

AU - Choi, Juhyung

AU - Piao, Yuanzhe

AU - Lee, Lawrence Yoon Suk

N1 - Funding Information: D.K. and S.P. contributed equally to this work. The authors acknowledge the support from the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government (MOTIE) (Grant No. 20215710100170), the Hong Kong Polytechnic University (Q‐CDAG and 1‐ZVST), and the Research Grants Council of the Hong Kong SAR (Grant No. PolyU15217521). This research was also supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (Grant No. NRF‐2022R1A6A3A01085806). D.K. acknowledges the award of the Hong Kong Ph.D. Fellowship. Publisher Copyright: © 2023 Wiley-VCH GmbH.

PY - 2023/9/19

Y1 - 2023/9/19

N2 - The generation of an active phase through dynamic surface reconstruction is a promising strategy for improving the activity of electrocatalysts. However, studies investigating the reconstruction process and its impact on the intrinsic properties of the catalysts are scarce. Herein, the surface reconstruction of NiFe2O4 interfaced with NiMoO4 (Ru–NFO/NMO) facilitated by Ru doping is reported. The electrochemical and material characterizations demonstrate that Ru doping can regulate the electronic structure of NFO/NMO and induce the high-valence state of Ni3.6+δ, facilitating the surface reconstruction to highly active Ru-doped NiFeOOH/NiOOH (SR-Ru–NFO/NMO). The optimized SR-Ru–NFO/NMO exhibits promising performance in the oxygen evolution reaction, displaying a low overpotential of 229 mV at 10 mA cm−2 and good stability at varying current densities for 80 h. Density functional theory calculations indicate that Ru doping can increase the electron density and optimize intermediate adsorption by shifting the d-band center downward. This work provides valuable insights into the tuning of electrocatalysts by surface reconstruction and offers a rational design strategy for the development of highly active oxygen evolution reaction electrocatalysts.

AB - The generation of an active phase through dynamic surface reconstruction is a promising strategy for improving the activity of electrocatalysts. However, studies investigating the reconstruction process and its impact on the intrinsic properties of the catalysts are scarce. Herein, the surface reconstruction of NiFe2O4 interfaced with NiMoO4 (Ru–NFO/NMO) facilitated by Ru doping is reported. The electrochemical and material characterizations demonstrate that Ru doping can regulate the electronic structure of NFO/NMO and induce the high-valence state of Ni3.6+δ, facilitating the surface reconstruction to highly active Ru-doped NiFeOOH/NiOOH (SR-Ru–NFO/NMO). The optimized SR-Ru–NFO/NMO exhibits promising performance in the oxygen evolution reaction, displaying a low overpotential of 229 mV at 10 mA cm−2 and good stability at varying current densities for 80 h. Density functional theory calculations indicate that Ru doping can increase the electron density and optimize intermediate adsorption by shifting the d-band center downward. This work provides valuable insights into the tuning of electrocatalysts by surface reconstruction and offers a rational design strategy for the development of highly active oxygen evolution reaction electrocatalysts.

KW - electronic structure modulation

KW - heterostructures

KW - oxygen evolution reaction

KW - ruthenium doping

KW - surface reconstruction

UR - https://www.scopus.com/pages/publications/85171444666

U2 - 10.1002/smll.202304822

DO - 10.1002/smll.202304822

M3 - Journal article

AN - SCOPUS:85171444666

SN - 1613-6810

VL - 20

JO - Small

JF - Small

IS - 5

M1 - 2304822

ER -

Surface-Reconstructed Ru-Doped Nickel/Iron Oxyhydroxide Arrays for Efficient Oxygen Evolution

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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