Order–disorder engineering of RuO<sub>2</sub>nanosheets towards pH-universal oxygen evolution

Zhang, Qichun; Zhang, Yuefeng; Zeng, Zhiyuan; Ho, Derek

doi:10.1039/d3mh00339f

Cited by 9 publications

(1 citation statement)

References 60 publications

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“…1–3 Hydrogen (H 2 ) is considered an alternative to fossil fuels owing to its high calorific value, good thermal conductivity, and cleanness; however, its current production strongly relies on natural gas steam reforming, which is a typical energy-intensive process. 4–7 The hydrogen evolution reaction (HER) via water electrolysis powered by renewable electricity has been recognized as an environmentally friendly and economically competitive approach for hydrogen evolution. 8–10 The HER can be commonly carried out under acidic or alkaline conditions, of which the alkaline medium is more preferred owing to its easy access to the electrolytic setup.…”

Section: Introductionmentioning

confidence: 99%

Realization of electron-deficient Ru sites via Co₄N coupling for synergistically enhanced alkaline hydrogen evolution

Xing,

Guo,

Yuan

et al. 2023

J. Mater. Chem. A

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Section: Introductionmentioning

confidence: 99%

Realization of electron-deficient Ru sites via Co₄N coupling for synergistically enhanced alkaline hydrogen evolution

Xing,

Guo,

Yuan

et al. 2023

J. Mater. Chem. A

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Spinel‐Type Metal Oxides with Tailored Amorphous/Crystalline Heterointerfaces for Enhanced Electrocatalytic Water Splitting

Wang,

Feng,

et al. 2024

Adv Funct Materials

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Metal oxides with spinel structure have garnered increasing attention as promising alternatives to noble metal‐based electrocatalysts. However, these electrocatalysts often fail to simultaneously exhibit high activity and stability for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), limiting their applications in electrocatalytic water splitting. Herein, crystalline/amorphous heterogeneous interfaces are successfully introduced into spinel NiCo2O4 nanosheets, which are grown in situ on carbon cloth (CC), denoted as NiCo2O4‐B‐CC. The amorphous/crystalline heterostructures combine the advantages of both phases in electrocatalysts. The amorphous phase of the spinel NiCo2O4 nanosheets modulates the electron density, provides abundant oxygen single vacancies as active sites, and enhances the corrosion resistance, while the crystalline phase improves conductivity. Density functional theory (DFT) calculations are performed to investigate the influence of surface oxygen single vacancy (SVO) on the activity of the OER and HER processes. The NiCo₂O₄‐B‐CC exhibits overpotentials of only 26 mV for HER and 215 mV for OER at a current density of 10 mA cm−2. It exhibits excellent electrocatalytic performance for water splitting, achieving a current density of 400 mA cm−2 at an applied voltage of 2.0 V. The construction of crystalline/amorphous heterogeneous interfaces in electrocatalysts provides novel approach for enhancing the electrocatalytic performance of metal oxides in water splitting.

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Deliberate Amorphization of Co‐MOF for Constructing Crystalline‐Amorphous Heterostructures Toward High‐Performance Water Electrolysis

Zhou,

et al. 2024

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The endowment of metal organic frameworks (MOF) with superior electrocatalytic performance without compromising their structural/compositional superiorities is of great significance for the development of renewable energy devices, yet remains a grand challenge. Herein, a deliberate partial amorphization strategy is developed to construct a heterostructured electrocatalyst consisting of crystalline Co‐MOF and amorphous Co‐S nanoflake arrays aligned on the carbon cloth (CC) substrate (abbreviated as Co‐MOF/Co‐S@CC hereafter) through a rapid sulfuration method. The simultaneous implement of crystalline‐amorphous (c‐a) heterostructure and nanoflake arrayed architecture on CC substrate renders the Co‐MOF/Co‐S@CC with abundant and tight active sites, accelerated charge transfer rate, regulated electronic structures, and reinforced structural stability. As such, the obtained Co‐MOF/Co‐S@CC electrode demonstrates outstanding electrochemical hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performances with the overpotentials of 64 and 217 mV at 10 mA cm−2, respectively. Moreover, a two‐electrode electrolyzer assembled by Co‐MOF/Co‐S@CC electrodes exhibits the lower cell voltages and larger current densities than those of Pt/C and RuO2 counterparts, excellent reversibility and prominent long‐term stability, representing a great prospect for feasible H2 production. This adopted concept of c‐a heterostructure for electronic regulation may bring about insightful inspiration for designing high‐performance electrocatalysts for sustainable energy systems.

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Order–disorder engineering of RuO₂nanosheets towards pH-universal oxygen evolution

Abstract: Ru-based electrocatalysts are always considered as the promising anode catalysts towards water electrolysis, due to their impressive activity at acidic conditions. Yet, due to the collapse of the local crystalline...

Cited by 9 publications

References 60 publications

Realization of electron-deficient Ru sites via Co₄N coupling for synergistically enhanced alkaline hydrogen evolution

Realization of electron-deficient Ru sites via Co₄N coupling for synergistically enhanced alkaline hydrogen evolution

Spinel‐Type Metal Oxides with Tailored Amorphous/Crystalline Heterointerfaces for Enhanced Electrocatalytic Water Splitting

Deliberate Amorphization of Co‐MOF for Constructing Crystalline‐Amorphous Heterostructures Toward High‐Performance Water Electrolysis

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Order–disorder engineering of RuO2nanosheets towards pH-universal oxygen evolution

Abstract: Ru-based electrocatalysts are always considered as the promising anode catalysts towards water electrolysis, due to their impressive activity at acidic conditions. Yet, due to the collapse of the local crystalline...

Cited by 9 publications

References 60 publications

Realization of electron-deficient Ru sites via Co4N coupling for synergistically enhanced alkaline hydrogen evolution

Realization of electron-deficient Ru sites via Co4N coupling for synergistically enhanced alkaline hydrogen evolution

Spinel‐Type Metal Oxides with Tailored Amorphous/Crystalline Heterointerfaces for Enhanced Electrocatalytic Water Splitting

Deliberate Amorphization of Co‐MOF for Constructing Crystalline‐Amorphous Heterostructures Toward High‐Performance Water Electrolysis

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Order–disorder engineering of RuO₂nanosheets towards pH-universal oxygen evolution

Realization of electron-deficient Ru sites via Co₄N coupling for synergistically enhanced alkaline hydrogen evolution

Realization of electron-deficient Ru sites via Co₄N coupling for synergistically enhanced alkaline hydrogen evolution