A Ni-loaded, metal–organic framework–graphene composite as a precursor for <i>in situ</i> electrochemical deposition of a highly active and durable water oxidation nanocatalyst

Hassan, Mohamed H.; Soliman, Ahmed B.; Elmehelmey, Worood A.; Abugable, Arwa A.; Karakalos, Stavros; Elbahri, Mady; Hassanien, A.; Alkordi, Mohamed H.

doi:10.1039/c8cc07120a

Cited by 37 publications

(20 citation statements)

References 41 publications

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“…The SURMOF is unstable under these conditions, rapid etching by the alkaline solution releases Ni(II)‐ions which react to yield Ni(OH) 2 , which is deposited, together with Zn(OH) 2 , on the electrode surface. As demonstrated in previous work, after a few CV scans the sacrificial SURMOF layer was completely converted to a mixed Zn/Ni hydroxide layer covering the electrode surface, see Scheme . The successful conversion of the Ni‐porphyrin based SURMOF by this electrochemical etching was demonstrated via X‐ray photoelectron spectroscopy (XPS) as well as energy‐dispersive X‐ray spectroscopy (EDX), vide infra.…”

Section: Resultsmentioning

confidence: 54%

Electrolytic Conversion of Sacrificial Metal–Organic Framework Thin Films into an Electrocatalytically Active Monolithic Oxide Coating for the Oxygen‐Evolution Reaction

et al. 2019

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The electrolytic conversion of SURMOFs, monolithic surface‐anchored metal–organic framework (MOF) thin films, to yield Ni(OH)2 coatings for utilization as electrocatalysts in the water oxidation reaction is described. The electrocatalytic properties of the hydroxide coating, namely an oxygen‐evolving reaction (OER) onset overpotential of 330 mV and overpotential of only 440 mV at a current density of 10 mA cm−2, are well comparable to some of the most efficient materials used for the OER process. This electrolytic transformation process represents a facile pathway for the fabrication of electrochemically and electrocatalytically active coatings, and is potentially transferrable to several other systems. This approach is an attractive alternative to the commonly utilized, energy intensive pyrolysis, where heating the samples to temperatures above 600 °C is common to induce full transformation into electroactive catalysts.

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Section: Resultsmentioning

confidence: 54%

Electrolytic Conversion of Sacrificial Metal–Organic Framework Thin Films into an Electrocatalytically Active Monolithic Oxide Coating for the Oxygen‐Evolution Reaction

et al. 2019

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“…In addition, Fe−BDC MOF/NF maintains excellent catalytic activity for at least 30 h and has high durability. Hassan et al [120] . described a unique strategy for preparing MOF‐derived materials by pyrolysis in 2019.…”

Section: Catalysts For Oermentioning

confidence: 99%

Research Progress of Oxygen Evolution Reaction Catalysts for Electrochemical Water Splitting

Zhou

Deng

et al. 2021

ChemSusChem

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The development of a low‐cost and high‐efficiency oxygen evolution reaction (OER) catalyst is essential to meet the future industrial demand for hydrogen production by electrochemical water splitting. Given the limited reserves of noble metals and many competitive applications in environmental protection, new energy, and chemical industries, many studies have focused on exploring new and efficient non‐noble metal catalytic systems, improving the understanding of the OER mechanism of non‐noble metal surfaces, and designing electrocatalysts with higher activity than traditional noble metals. This Review summarizes the research progress of anode OER catalysts for hydrogen production by electrochemical water splitting in recent years, for noble metal and non‐noble metal catalysts, where non‐noble metal catalysts are highlighted. The categories are as follows: (1) Transition metal‐based compounds, including transition metal‐based oxides, transition metal‐based layered hydroxides, and transition metal‐based sulfides, phosphides, selenides, borides, carbides, and nitrides. Transition metal‐based oxides can also be divided into perovskite, spinel, amorphous, rock‐salt‐type, and lithium oxides according to their different structures. (2) Carbonaceous materials and their composite materials with transition metals. (3) Transition metal‐based metal‐organic frameworks and their derivatives. Finally, the challenges and future development of the OER process of water splitting are discussed.

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“…The resultant precursor after pyrolysis deposit hydro‐oxides of Ni and Zr on graphene nanoplates and transformation of β‐Ni (OH) 2 →β‐NiOOH→γ‐NiOOH is mainly responsible for the enhanced electrocatalytic activity. The as‐prepared material possesses a Tafel slope of 45 mV/dec along with a required overpotential 0.38 V [203] …”

Section: Materials For Oermentioning

confidence: 99%

Recent Advances in Electrocatalysis of Oxygen Evolution Reaction using Noble‐Metal, Transition‐Metal, and Carbon‐Based Materials

2020

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A considerable concern in exploring clean, efficient, and renewable energy resources to effectively replace fossil fuels and to combat the environmental problems and energy scarcities for a sustainable future has been observed. In this context, hydrogen is a clean, renewable, energetically efficient fuel with infinite potential for the future, which can generate a large amount of energy through the electrocatalytic splitting of earth‐abundant water resources. Noble metals, owing to their extraordinary efficiency and stability, are state‐of‐the‐art catalysts for the oxygen evolution reaction (OER) process. However, their scarcity and high cost hamper their commercialization. To replace these expensive noble‐metal‐based materials, researchers are extensively working on the development of cost effective, stable, conductive, and efficient non‐noble metal based materials such as transition metal oxides, borides, nitrides, sulfides, phosphides, selenides, perovskites oxides, and layered double hydroxides, where the incorporation of heteroatoms improves the electrocatalytic activity by modifying the electronic structure and enhances the conductivity and stability. In the case of transition‐metal based metal organic frameworks (MOFs) and MOF‐derived materials, the unique structure of MOFs with a high surface area and porosity, as well as rich redox chemistry of transition metals, leads to excellent response towards the OER process. Moreover, direct utilization of carbonaceous materials or making their composites with transition metals not only enhances the conductivity due to their conductive nature but also promotes stability by strongly binding with the electrocatalyst. Owing to the presence of functional groups on the surface or through different interactions, they provide multiple paths for facile electron and ion transport due to the sheet/network like structure, which help in the fine dispersion of electrocatalyst due to high surface area, prevent agglomeration, and in turn results in improved electrocatalytic activity. Besides these advances, a) there is still a need for a thorough understanding of reaction mechanism via in situ spectroscopic techniques to further optimize the composition and design of electrocatalyst to get desired results, b) the stability of the materials should be further enhanced to practically utilize synthesized material under harsh conditions without degradation, and c) the utilization of these optimized OER catalysts in a solar cell to consume solar energy (renewable energy source), remains a key requirement of the modern era.

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A Ni-loaded, metal–organic framework–graphene composite as a precursor for in situ electrochemical deposition of a highly active and durable water oxidation nanocatalyst

Abstract: UiO-66-NH2 was constructed on G sheets, metallated with Ni(ii) ions, and used as a precursor to deposit a highly active water oxidation catalyst in an electrochemical surface restructuring process.

Cited by 37 publications

References 41 publications

Electrolytic Conversion of Sacrificial Metal–Organic Framework Thin Films into an Electrocatalytically Active Monolithic Oxide Coating for the Oxygen‐Evolution Reaction

Electrolytic Conversion of Sacrificial Metal–Organic Framework Thin Films into an Electrocatalytically Active Monolithic Oxide Coating for the Oxygen‐Evolution Reaction

Research Progress of Oxygen Evolution Reaction Catalysts for Electrochemical Water Splitting

Recent Advances in Electrocatalysis of Oxygen Evolution Reaction using Noble‐Metal, Transition‐Metal, and Carbon‐Based Materials

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