2D Ruthenium–Chromium Oxide with Rich Grain Boundaries Boosts Acidic Oxygen Evolution Reaction Kinetics

Xuhao Zhao; Zijian Li; Haeseong Jang; Xiaoqian Wei; Liu Wang; Min Gyu Kim; Jaephil Cho; Xien Liu; Qing Qin

doi:10.1002/smll.202311172

2D Ruthenium–Chromium Oxide with Rich Grain Boundaries Boosts Acidic Oxygen Evolution Reaction Kinetics

Xuhao Zhao, Zijian Li, Haeseong Jang^*, Xiaoqian Wei, Liu Wang, Min Gyu Kim, Jaephil Cho^*, Xien Liu^*, Qing Qin^*

^*Corresponding author for this work

Department of Chemistry

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

40 Citations (Scopus)

Abstract

Ruthenium oxide is currently considered as the promising alternative to Ir-based catalysts employed for proton exchange membrane water electrolyzers but still faces the bottlenecks of limited durability and slow kinetics. Herein, a 2D amorphous/crystalline heterophase ac-Cr_0.53Ru_0.47O_2-δ substitutional solid solution with pervasive grain boundaries (GBs) is developed to accelerate the kinetics of acidic oxygen evolution reaction (OER) and extend the long-term stability simultaneously. The ac-Cr_0.53Ru_0.47O_2-δ shows a super stability with a slow degradation rate and a remarkable mass activity of 455 A g_Ru⁻¹ at 1.6 V vs RHE, which is ≈3.6- and 5.9-fold higher than those of synthesized RuO₂ and commercial RuO₂, respectively. The strong interaction of Cr–O–Ru local units in synergy with the specific 2D structural characteristics of ac-Cr_0.53Ru_0.47O_2-δ dominates its enhanced stability. Meanwhile, high-density GBs and the shortened Ru-O bonds tailored by amorphous/crystalline structure and Cr–O–Ru interaction regulate the adsorption and desorption rates of oxygen intermediates, thus accelerating the overall acidic OER kinetics. © 2024 Wiley-VCH GmbH.

Original language	English
Article number	2311172
Journal	Small
Volume	20
Issue number	29
Online published	13 Feb 2024
DOIs	https://doi.org/10.1002/smll.202311172
Publication status	Published - 18 Jul 2024

Research Keywords

durability
grain boundaries
kinetics
metal–oxygen bonds
oxygen evolution reaction

Access Output

10.1002/smll.202311172

Other Access Options

Check CityUHK Library

Permanent Link

Right click to copy link

Cite this

@article{38e01300e30a4a84a5ac271ef164afb4,

title = "2D Ruthenium–Chromium Oxide with Rich Grain Boundaries Boosts Acidic Oxygen Evolution Reaction Kinetics",

abstract = "Ruthenium oxide is currently considered as the promising alternative to Ir-based catalysts employed for proton exchange membrane water electrolyzers but still faces the bottlenecks of limited durability and slow kinetics. Herein, a 2D amorphous/crystalline heterophase ac-Cr0.53Ru0.47O2-δ substitutional solid solution with pervasive grain boundaries (GBs) is developed to accelerate the kinetics of acidic oxygen evolution reaction (OER) and extend the long-term stability simultaneously. The ac-Cr0.53Ru0.47O2-δ shows a super stability with a slow degradation rate and a remarkable mass activity of 455 A gRu−1 at 1.6 V vs RHE, which is ≈3.6- and 5.9-fold higher than those of synthesized RuO2 and commercial RuO2, respectively. The strong interaction of Cr–O–Ru local units in synergy with the specific 2D structural characteristics of ac-Cr0.53Ru0.47O2-δ dominates its enhanced stability. Meanwhile, high-density GBs and the shortened Ru-O bonds tailored by amorphous/crystalline structure and Cr–O–Ru interaction regulate the adsorption and desorption rates of oxygen intermediates, thus accelerating the overall acidic OER kinetics. {\textcopyright} 2024 Wiley-VCH GmbH.",

keywords = "durability, grain boundaries, kinetics, metal–oxygen bonds, oxygen evolution reaction",

author = "Xuhao Zhao and Zijian Li and Haeseong Jang and Xiaoqian Wei and Liu Wang and Kim, {Min Gyu} and Jaephil Cho and Xien Liu and Qing Qin",

year = "2024",

month = jul,

day = "18",

doi = "10.1002/smll.202311172",

language = "English",

volume = "20",

journal = "Small",

issn = "1613-6810",

publisher = "Wiley-VCH Verlag GmbH",

number = "29",

}

TY - JOUR

T1 - 2D Ruthenium–Chromium Oxide with Rich Grain Boundaries Boosts Acidic Oxygen Evolution Reaction Kinetics

AU - Zhao, Xuhao

AU - Li, Zijian

AU - Jang, Haeseong

AU - Wei, Xiaoqian

AU - Wang, Liu

AU - Kim, Min Gyu

AU - Cho, Jaephil

AU - Liu, Xien

AU - Qin, Qing

PY - 2024/7/18

Y1 - 2024/7/18

N2 - Ruthenium oxide is currently considered as the promising alternative to Ir-based catalysts employed for proton exchange membrane water electrolyzers but still faces the bottlenecks of limited durability and slow kinetics. Herein, a 2D amorphous/crystalline heterophase ac-Cr0.53Ru0.47O2-δ substitutional solid solution with pervasive grain boundaries (GBs) is developed to accelerate the kinetics of acidic oxygen evolution reaction (OER) and extend the long-term stability simultaneously. The ac-Cr0.53Ru0.47O2-δ shows a super stability with a slow degradation rate and a remarkable mass activity of 455 A gRu−1 at 1.6 V vs RHE, which is ≈3.6- and 5.9-fold higher than those of synthesized RuO2 and commercial RuO2, respectively. The strong interaction of Cr–O–Ru local units in synergy with the specific 2D structural characteristics of ac-Cr0.53Ru0.47O2-δ dominates its enhanced stability. Meanwhile, high-density GBs and the shortened Ru-O bonds tailored by amorphous/crystalline structure and Cr–O–Ru interaction regulate the adsorption and desorption rates of oxygen intermediates, thus accelerating the overall acidic OER kinetics. © 2024 Wiley-VCH GmbH.

AB - Ruthenium oxide is currently considered as the promising alternative to Ir-based catalysts employed for proton exchange membrane water electrolyzers but still faces the bottlenecks of limited durability and slow kinetics. Herein, a 2D amorphous/crystalline heterophase ac-Cr0.53Ru0.47O2-δ substitutional solid solution with pervasive grain boundaries (GBs) is developed to accelerate the kinetics of acidic oxygen evolution reaction (OER) and extend the long-term stability simultaneously. The ac-Cr0.53Ru0.47O2-δ shows a super stability with a slow degradation rate and a remarkable mass activity of 455 A gRu−1 at 1.6 V vs RHE, which is ≈3.6- and 5.9-fold higher than those of synthesized RuO2 and commercial RuO2, respectively. The strong interaction of Cr–O–Ru local units in synergy with the specific 2D structural characteristics of ac-Cr0.53Ru0.47O2-δ dominates its enhanced stability. Meanwhile, high-density GBs and the shortened Ru-O bonds tailored by amorphous/crystalline structure and Cr–O–Ru interaction regulate the adsorption and desorption rates of oxygen intermediates, thus accelerating the overall acidic OER kinetics. © 2024 Wiley-VCH GmbH.

KW - durability

KW - grain boundaries

KW - kinetics

KW - metal–oxygen bonds

KW - oxygen evolution reaction

UR - http://www.scopus.com/inward/record.url?scp=85184680874&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85184680874&origin=recordpage

U2 - 10.1002/smll.202311172

DO - 10.1002/smll.202311172

M3 - RGC 21 - Publication in refereed journal

SN - 1613-6810

VL - 20

JO - Small

JF - Small

IS - 29

M1 - 2311172

ER -

2D Ruthenium–Chromium Oxide with Rich Grain Boundaries Boosts Acidic Oxygen Evolution Reaction Kinetics

Abstract

Research Keywords

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Cite this