Pseudo-Perovskite Oxide with in Situ Surface Reconstructed Metals for Alkaline Hydrogen Evolution

Seulgi Jeong; Yihan Zhang; Joohoon Kang; Sangjin Lee; Jeong Min Baik; Hyesung Park

doi:10.1021/acsenergylett.5c01403

Pseudo-Perovskite Oxide with in Situ Surface Reconstructed Metals for Alkaline Hydrogen Evolution

Seulgi Jeong, Yihan Zhang, Joohoon Kang, Sangjin Lee, Jeong Min Baik, Hyesung Park

Department of Advanced Materials Science and Engineering

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

Abstract

The development of non-noble-metal electrocatalysts for the hydrogen evolution reaction (HER) at industrial current densities is essential for advancing alkaline water electrolysis. Herein, a pseudo-perovskite oxide-based Ni-monolithic electrode integrated with nanosocketed CoNi particles (CoNi-La_0.6Sr_0.4Co_0.8Fe_0.2O_3−δ, denoted CoNi-LSCF) was developed via the in situ growth of bimetallic CoNi nanoparticles on perovskite oxide. The CoNi-LSCF electrode exhibited a promising alkaline HER performance, achieving an overpotential of 28 mV at 10 mA cm^-2 and a low Tafel slope of 24 mV dec^-1. Additionally, the electrode maintained stable operation for over 1000 h at 1 A cm^-2. The enhanced catalytic activity and long-term stability are attributed to the synergistic interaction between CoNi nanoparticles and the pseudo-perovskite oxide, which optimizes water dissociation and hydrogen adsorption/desorption at the electrode surface. This study introduces a viable approach to designing efficient and durable electrocatalysts that offers a scalable solution for practical water electrolysis systems.

Original language	English
Pages (from-to)	3591-3599
Number of pages	9
Journal	ACS Energy Letters
Volume	10
Issue number	7
DOIs	https://doi.org/10.1021/acsenergylett.5c01403
State	Published - 11 Jul 2025

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title = "Pseudo-Perovskite Oxide with in Situ Surface Reconstructed Metals for Alkaline Hydrogen Evolution",

abstract = "The development of non-noble-metal electrocatalysts for the hydrogen evolution reaction (HER) at industrial current densities is essential for advancing alkaline water electrolysis. Herein, a pseudo-perovskite oxide-based Ni-monolithic electrode integrated with nanosocketed CoNi particles (CoNi-La0.6Sr0.4Co0.8Fe0.2O3−δ, denoted CoNi-LSCF) was developed via the in situ growth of bimetallic CoNi nanoparticles on perovskite oxide. The CoNi-LSCF electrode exhibited a promising alkaline HER performance, achieving an overpotential of 28 mV at 10 mA cm-2 and a low Tafel slope of 24 mV dec-1. Additionally, the electrode maintained stable operation for over 1000 h at 1 A cm-2. The enhanced catalytic activity and long-term stability are attributed to the synergistic interaction between CoNi nanoparticles and the pseudo-perovskite oxide, which optimizes water dissociation and hydrogen adsorption/desorption at the electrode surface. This study introduces a viable approach to designing efficient and durable electrocatalysts that offers a scalable solution for practical water electrolysis systems.",

author = "Seulgi Jeong and Yihan Zhang and Joohoon Kang and Sangjin Lee and Baik, \{Jeong Min\} and Hyesung Park",

note = "Publisher Copyright: {\textcopyright} 2025 American Chemical Society.",

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doi = "10.1021/acsenergylett.5c01403",

language = "English",

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T1 - Pseudo-Perovskite Oxide with in Situ Surface Reconstructed Metals for Alkaline Hydrogen Evolution

AU - Jeong, Seulgi

AU - Zhang, Yihan

AU - Kang, Joohoon

AU - Lee, Sangjin

AU - Baik, Jeong Min

AU - Park, Hyesung

PY - 2025/7/11

Y1 - 2025/7/11

N2 - The development of non-noble-metal electrocatalysts for the hydrogen evolution reaction (HER) at industrial current densities is essential for advancing alkaline water electrolysis. Herein, a pseudo-perovskite oxide-based Ni-monolithic electrode integrated with nanosocketed CoNi particles (CoNi-La0.6Sr0.4Co0.8Fe0.2O3−δ, denoted CoNi-LSCF) was developed via the in situ growth of bimetallic CoNi nanoparticles on perovskite oxide. The CoNi-LSCF electrode exhibited a promising alkaline HER performance, achieving an overpotential of 28 mV at 10 mA cm-2 and a low Tafel slope of 24 mV dec-1. Additionally, the electrode maintained stable operation for over 1000 h at 1 A cm-2. The enhanced catalytic activity and long-term stability are attributed to the synergistic interaction between CoNi nanoparticles and the pseudo-perovskite oxide, which optimizes water dissociation and hydrogen adsorption/desorption at the electrode surface. This study introduces a viable approach to designing efficient and durable electrocatalysts that offers a scalable solution for practical water electrolysis systems.

AB - The development of non-noble-metal electrocatalysts for the hydrogen evolution reaction (HER) at industrial current densities is essential for advancing alkaline water electrolysis. Herein, a pseudo-perovskite oxide-based Ni-monolithic electrode integrated with nanosocketed CoNi particles (CoNi-La0.6Sr0.4Co0.8Fe0.2O3−δ, denoted CoNi-LSCF) was developed via the in situ growth of bimetallic CoNi nanoparticles on perovskite oxide. The CoNi-LSCF electrode exhibited a promising alkaline HER performance, achieving an overpotential of 28 mV at 10 mA cm-2 and a low Tafel slope of 24 mV dec-1. Additionally, the electrode maintained stable operation for over 1000 h at 1 A cm-2. The enhanced catalytic activity and long-term stability are attributed to the synergistic interaction between CoNi nanoparticles and the pseudo-perovskite oxide, which optimizes water dissociation and hydrogen adsorption/desorption at the electrode surface. This study introduces a viable approach to designing efficient and durable electrocatalysts that offers a scalable solution for practical water electrolysis systems.

UR - https://www.scopus.com/pages/publications/105009533054

U2 - 10.1021/acsenergylett.5c01403

DO - 10.1021/acsenergylett.5c01403

M3 - Article

AN - SCOPUS:105009533054

SN - 2380-8195

VL - 10

SP - 3591

EP - 3599

JO - ACS Energy Letters

JF - ACS Energy Letters

IS - 7

ER -

Pseudo-Perovskite Oxide with in Situ Surface Reconstructed Metals for Alkaline Hydrogen Evolution

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