Recent advances in Ru/Ir-based electrocatalysts for acidic oxygen evolution reaction

Gao, Guoliang; Sun, Zixu; Chen, Xueli; Zhu, Guang; Sun, Bowen; Yamauchi, Yusuke; Liu, Shude

doi:10.1016/j.apcatb.2023.123584

Cited by 37 publications

(3 citation statements)

References 201 publications

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“…Ruthenium (Ru) has garnered considerable attention compared to other platinum group metals due to its relative cost-effectiveness, moderate binding with reactive intermediates, and decent corrosion resistance. − To improve the atomic utilization, Ru-based nanoparticles are usually employed . To further improve their electrocatalytic HER and OER activities, as well as inhibit the peroxidation during OER, ,− various nanostructuring strategies have been reported.…”

Section: Bifunctional Electrocatalysts For Overall Water Splittingmentioning

confidence: 99%

Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Quan,

Jiang,

Mei

et al. 2024

Chem. Rev.

128

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Electrocatalytic water splitting driven by renewable electricity has been recognized as a promising approach for green hydrogen production. Different from conventional strategies in developing electrocatalysts for the two half-reactions of water splitting (e.g., the hydrogen and oxygen evolution reactions, HER and OER) separately, there has been a growing interest in designing and developing bifunctional electrocatalysts, which are able to catalyze both the HER and OER. In addition, considering the high overpotentials required for OER while limited value of the produced oxygen, there is another rapidly growing interest in exploring alternative oxidation reactions to replace OER for hybrid water splitting toward energy-efficient hydrogen generation. This Review begins with an introduction on the fundamental aspects of water splitting, followed by a thorough discussion on various physicochemical characterization techniques that are frequently employed in probing the active sites, with an emphasis on the reconstruction of bifunctional electrocatalysts during redox electrolysis. The design, synthesis, and performance of diverse bifunctional electrocatalysts based on noble metals, nonprecious metals, and metal-free nanocarbons, for overall water splitting in acidic and alkaline electrolytes, are thoroughly summarized and compared. Next, their application toward hybrid water splitting is also presented, wherein the alternative anodic reactions include sacrificing agents oxidation, pollutants oxidative degradation, and organics oxidative upgrading. Finally, a concise statement on the current challenges and future opportunities of bifunctional electrocatalysts for both overall and hybrid water splitting is presented in the hope of guiding future endeavors in the quest for energy-efficient and sustainable green hydrogen production.

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Section: Bifunctional Electrocatalysts For Overall Water Splittingmentioning

confidence: 99%

Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Quan,

Jiang,

Mei

et al. 2024

Chem. Rev.

128

View full text Add to dashboard Cite

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“…Therefore, seeking efficient and stable bifunctional electrocatalysts in order to increase the kinetics of the two half-cell reactions by lowering the energy barrier as well as to overcome their unfolding becomes crucial. To date, Ir/Ru-based metal oxides as well as the Pt-based precious metal alloys have been known as the best electrocatalysts for OER and HER in both basic and acidic media, respectively [12,13]. Nevertheless, despite significantly lowering the overpotentials as well as enhancing the conversion efficiency with respect to the water-splitting process, they are made from noble metals, thereby, limiting their utilization as practically promising electrocatalysts, particularly for large-scale applications.…”

Section: Introductionmentioning

confidence: 99%

Covalent Molecular Anchoring of Metal-Free Porphyrin on Graphitic Surfaces toward Improved Electrocatalytic Activities in Acidic Medium

Huynh,

Phan

2024

Coatings

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Robust engineering of two-dimensional (2D) materials via covalent grafting of organic molecules has been a great strategy for permanently tuningtheir physicochemical behaviors toward electrochemical energy applications. Herein, we demonstrated that a covalent functionalization approach of graphitic surfaces including graphene by a graftable porphyrin (g-Por) derivative, abbreviated as g-Por/HOPG or g-Por/G, is realizable. The efficiency of this approach is determined at both the molecular and global scales by using a state-of-the-art toolbox including cyclic voltammetry (CV), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, atomic force microscopy (AFM), and scanning tunneling microscopy (STM). Consequently, g-Por molecules were proven to covalently graft on graphitic surfaces via C-C bonds, resulting in the formation of a robust novel hybrid 2D material visualized by AFM and STM imaging. Interestingly, the resulting robust molecular material was elucidated as a novel bifunctional catalyst for both the oxygen evolution (OER) and the hydrogen evolution reactions (HER) in acidic medium with highly catalytic stability and examined at the molecular level. These findings contribute to an in-depth understanding at the molecular level ofthe contribution of the synergetic effects of molecular structures toward the water-splitting process.

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“…The open-layer structure enhances the specific surface area, boosts active site exposure, aids electrolyte infiltration, and promotes the timely release of produced H 2 . The anodic OER entails a four-electron transfer mechanism (4OH – → 2H 2 O + O 2 + 4e – ), necessitating a substantial overpotential (>1.23 V) and significant energy expenditure, thereby significantly constraining the overall efficiency of electrolytic water. − Additionally, during the water electrolysis process, the low-value oxygen produced at anodes readily intermingles with the hydrogen evolved at cathodes, often necessitating the utilization of costly diaphragms. − Compared with OER, six-electron transfer urea oxidation (UOR) (CO(NH 2 ) 2 + 6OH – → N 2 + 5H 2 O + CO 2 + 6e – ) has a low theoretical overpotential of 0.37 V, and the substitution of traditional OER with anodic UOR presents a potentially advantageous electrolysis technique for energy conservation . This is attributed to its comparatively low thermodynamic potential and the ample availability of urea-rich wastewater sources. , The utilization of urea-rich wastewater as an electrolyte enables the simultaneous production of hydrogen and the purification of such wastewater, aligning with the societal principles of environmental preservation and energy efficiency.…”

Section: Introductionmentioning

confidence: 99%

Controlled Synthesis of MoNi₄ Ultrathin Nanosheet Arrays as an Efficient Bifunctional Electrocatalyst for Urea-Assisted Hydrogen Production

Gao,

Yang,

Gao

et al. 2024

J. Phys. Chem. C

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The utilization of water electrolysis as a technology for industrial hydrogen production is considered highly appealing. Currently, the sluggish anodic oxygen evolution reaction (OER), which involves a four-electron transfer process, hampers the overall efficiency of water splitting. The coupling of urea electrocatalysis with the hydrogen evolution reaction (HER) holds significant promise in achieving energy-efficient hydrogen production. Here, we present a study showcasing the in situ synthesis of arrays consisting of ultrathin MoNi 4 nanosheets on a Ni foam (NF) substrate (MoNi 4 /NF). The catalyst exhibits high bifunctional activity due to its excellent intrinsic activity, increased exposure of active sites, and favorable morphology and structure of the electrode material. Specifically, overpotentials as low as 146 mV and 1.42 V are sufficient to drive a current density of 100 mA cm −2 for the HER and urea oxidation reaction (UOR), respectively. Moreover, the utilization of optimized MoNi 4 /NF as a dual-electrode catalyst enables the provision of a current density of 100 mA cm −2 for hybrid water splitting when operating at a cell voltage of 1.54 V. This study presents a novel concept for the advancement of effective and enduring bifunctional electrocatalysts capable of facilitating both the HER and the UOR.

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Recent advances in Ru/Ir-based electrocatalysts for acidic oxygen evolution reaction

Cited by 37 publications

References 201 publications

Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Covalent Molecular Anchoring of Metal-Free Porphyrin on Graphitic Surfaces toward Improved Electrocatalytic Activities in Acidic Medium

Controlled Synthesis of MoNi₄ Ultrathin Nanosheet Arrays as an Efficient Bifunctional Electrocatalyst for Urea-Assisted Hydrogen Production

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Recent advances in Ru/Ir-based electrocatalysts for acidic oxygen evolution reaction

Cited by 37 publications

References 201 publications

Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

Covalent Molecular Anchoring of Metal-Free Porphyrin on Graphitic Surfaces toward Improved Electrocatalytic Activities in Acidic Medium

Controlled Synthesis of MoNi4 Ultrathin Nanosheet Arrays as an Efficient Bifunctional Electrocatalyst for Urea-Assisted Hydrogen Production

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Controlled Synthesis of MoNi₄ Ultrathin Nanosheet Arrays as an Efficient Bifunctional Electrocatalyst for Urea-Assisted Hydrogen Production