A Cost-Effective, Nanoporous, High-Entropy Oxide Electrode for Electrocatalytic Water Splitting

Bu Jine Liu; Tai Hsin Yin; Yu Wei Lin; Chun Wei Chang; Hsin Chieh Yu; Yongtaek Lim; Hyesung Lee; Changsik Choi; Ming Kang Tsai; Yong Man Choi

doi:10.3390/coatings13081461

A Cost-Effective, Nanoporous, High-Entropy Oxide Electrode for Electrocatalytic Water Splitting

Bu Jine Liu
, Tai Hsin Yin
, Yu Wei Lin
, Chun Wei Chang
, Hsin Chieh Yu
, Yongtaek Lim
, Hyesung Lee
, Changsik Choi^*
, Ming Kang Tsai
, Yong Man Choi^*

^*Corresponding author for this work

Department of Chemistry

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

10 Citations (Scopus)

Abstract

High-entropy materials have attracted extensive attention as emerging electrode materials in various energy applications due to their flexible tunability, unusual outstanding activities, and cost-effectiveness using multiple earth-abundant elements. We introduce a novel high-entropy composite oxide with the five elements of Cu, Ni, Co, Fe, and Cr (HEO-3CNF) for use in the oxygen evolution reaction (OER) in electrocatalytic water splitting. HEO-3CNF is composed of two phases with a non-equimolar, deficient high-entropy spinel oxide of (Cu_0.2−xNi_0.2Co_0.2Fe_0.2Cr_0.2)₃O₄ and monoclinic copper oxide (CuO). Electrochemical impedance spectroscopy (EIS) with distribution of relaxation times (DRT) analysis validates that the HEO-3CNF-based electrode exhibits faster charge transfer than benchmark CuO. It results in improved OER performance with a lower overpotential at 10 mA/cm² and a Tafel slope than CuO (518.1 mV and 119.7 mV/dec versus 615.9 mV and 131.7 mV/dec, respectively) in alkaline conditions. This work may provide a general strategy for preparing novel, cost-effective, high-entropy electrodes for water splitting.

Original language	English
Article number	1461
Journal	Coatings
Volume	13
Issue number	8
DOIs	https://doi.org/10.3390/coatings13081461
Publication status	Published - 2023 Aug

Keywords

electrochemical impedance spectroscopy
high-entropy oxides
hydrogen production
thin films

ASJC Scopus subject areas

Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

UN SDGs

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

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10.3390/coatings13081461

Cite this

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title = "A Cost-Effective, Nanoporous, High-Entropy Oxide Electrode for Electrocatalytic Water Splitting",

abstract = "High-entropy materials have attracted extensive attention as emerging electrode materials in various energy applications due to their flexible tunability, unusual outstanding activities, and cost-effectiveness using multiple earth-abundant elements. We introduce a novel high-entropy composite oxide with the five elements of Cu, Ni, Co, Fe, and Cr (HEO-3CNF) for use in the oxygen evolution reaction (OER) in electrocatalytic water splitting. HEO-3CNF is composed of two phases with a non-equimolar, deficient high-entropy spinel oxide of (Cu0.2−xNi0.2Co0.2Fe0.2Cr0.2)3O4 and monoclinic copper oxide (CuO). Electrochemical impedance spectroscopy (EIS) with distribution of relaxation times (DRT) analysis validates that the HEO-3CNF-based electrode exhibits faster charge transfer than benchmark CuO. It results in improved OER performance with a lower overpotential at 10 mA/cm2 and a Tafel slope than CuO (518.1 mV and 119.7 mV/dec versus 615.9 mV and 131.7 mV/dec, respectively) in alkaline conditions. This work may provide a general strategy for preparing novel, cost-effective, high-entropy electrodes for water splitting.",

keywords = "electrochemical impedance spectroscopy, high-entropy oxides, hydrogen production, thin films",

author = "Liu, \{Bu Jine\} and Yin, \{Tai Hsin\} and Lin, \{Yu Wei\} and Chang, \{Chun Wei\} and Yu, \{Hsin Chieh\} and Yongtaek Lim and Hyesung Lee and Changsik Choi and Tsai, \{Ming Kang\} and Choi, \{Yong Man\}",

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year = "2023",

month = aug,

doi = "10.3390/coatings13081461",

language = "English",

volume = "13",

journal = "Coatings",

issn = "2079-6412",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "8",

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T1 - A Cost-Effective, Nanoporous, High-Entropy Oxide Electrode for Electrocatalytic Water Splitting

AU - Liu, Bu Jine

AU - Yin, Tai Hsin

AU - Lin, Yu Wei

AU - Chang, Chun Wei

AU - Yu, Hsin Chieh

AU - Lim, Yongtaek

AU - Lee, Hyesung

AU - Choi, Changsik

AU - Tsai, Ming Kang

AU - Choi, Yong Man

PY - 2023/8

Y1 - 2023/8

N2 - High-entropy materials have attracted extensive attention as emerging electrode materials in various energy applications due to their flexible tunability, unusual outstanding activities, and cost-effectiveness using multiple earth-abundant elements. We introduce a novel high-entropy composite oxide with the five elements of Cu, Ni, Co, Fe, and Cr (HEO-3CNF) for use in the oxygen evolution reaction (OER) in electrocatalytic water splitting. HEO-3CNF is composed of two phases with a non-equimolar, deficient high-entropy spinel oxide of (Cu0.2−xNi0.2Co0.2Fe0.2Cr0.2)3O4 and monoclinic copper oxide (CuO). Electrochemical impedance spectroscopy (EIS) with distribution of relaxation times (DRT) analysis validates that the HEO-3CNF-based electrode exhibits faster charge transfer than benchmark CuO. It results in improved OER performance with a lower overpotential at 10 mA/cm2 and a Tafel slope than CuO (518.1 mV and 119.7 mV/dec versus 615.9 mV and 131.7 mV/dec, respectively) in alkaline conditions. This work may provide a general strategy for preparing novel, cost-effective, high-entropy electrodes for water splitting.

AB - High-entropy materials have attracted extensive attention as emerging electrode materials in various energy applications due to their flexible tunability, unusual outstanding activities, and cost-effectiveness using multiple earth-abundant elements. We introduce a novel high-entropy composite oxide with the five elements of Cu, Ni, Co, Fe, and Cr (HEO-3CNF) for use in the oxygen evolution reaction (OER) in electrocatalytic water splitting. HEO-3CNF is composed of two phases with a non-equimolar, deficient high-entropy spinel oxide of (Cu0.2−xNi0.2Co0.2Fe0.2Cr0.2)3O4 and monoclinic copper oxide (CuO). Electrochemical impedance spectroscopy (EIS) with distribution of relaxation times (DRT) analysis validates that the HEO-3CNF-based electrode exhibits faster charge transfer than benchmark CuO. It results in improved OER performance with a lower overpotential at 10 mA/cm2 and a Tafel slope than CuO (518.1 mV and 119.7 mV/dec versus 615.9 mV and 131.7 mV/dec, respectively) in alkaline conditions. This work may provide a general strategy for preparing novel, cost-effective, high-entropy electrodes for water splitting.

KW - electrochemical impedance spectroscopy

KW - high-entropy oxides

KW - hydrogen production

KW - thin films

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UR - https://www.scopus.com/pages/publications/85169079520#tab=citedBy

U2 - 10.3390/coatings13081461

DO - 10.3390/coatings13081461

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VL - 13

JO - Coatings

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IS - 8

M1 - 1461

ER -

A Cost-Effective, Nanoporous, High-Entropy Oxide Electrode for Electrocatalytic Water Splitting

Abstract

Keywords

ASJC Scopus subject areas

UN SDGs

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