Microwave-assisted CVD-like synthesis of dispersed monolayer/few-layer N-doped graphene encapsulated metal nanocrystals for efficient electrocatalytic oxygen evolution

Bu, Fanxing; Chen, Wenshu; Gu, Jiajun; Agboola, Phillips O.; Al‐Khalli, Najeeb; Shakir, Imran; Xu, Yuxi

doi:10.1039/c8sc02444h

Cited by 49 publications

(43 citation statements)

References 31 publications

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“…Metal alloy nanomaterials, including FeNi, [82,83] FeCo, [84][85][86] IrCo, [87] and CoNi alloys, [88,89] can also be obtained from MOFs by pyrolysis for application in the field of electrocatalysts. Recently, Zhang et al reported FeCo bimetallic N-doped porous carbons (FeCo-C/N) obtained from the calcination of yolk-shell-structured ZIFs.…”

Section: Metal-and Alloy-doped Carbon Electrocatalystsmentioning

confidence: 99%

“…[79,[214][215][216][217][218][219][220] The M@C materials retain not only the large surface area of their parental MOFs but also show excellent conductivity and catalytic activity. Meanwhile, the metal nodes around organic ligands can be reduced in situ to single atomic sites [221] or bimetal alloy [82,88,89,222] cores encapsulated in a heteroatom-doped carbon frame after pyrolysis under an inert gas atmosphere. The resulting materials possess a unique electronic effect and extra synergistic effect, resulting in the acceleration of the catalytic reaction kinetics for the OER.…”

Section: Catalysts For the Oxygen Evolution Reactionmentioning

confidence: 99%

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Designing MOF Nanoarchitectures for Electrochemical Water Splitting

et al. 2021

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carrier with an extremely high energy density (approximately 142 MJ kg −1 ) and zero-carbon content, has been regarded as a promising clean fuel. [1,2] In this context, electrochemical water splitting, which converts electricity into storable hydrogen, is a viable and efficient solution to mitigate severe energy shortages and greenhouse gas emissions. [3] Among these strategies, hydrogen and oxygen evolution reactions, which occur on the cathode and anode, respectively, in a water electrolyzer, are considered as two critical half-reactions of the water-splitting process. [4] Theoretically, water splitting requires a thermodynamic Gibbs free energy (ΔG) of approximately 237.2 kJ mol −1 , corresponding to a standard potential (ΔE) of 1.23 V versus a reversible hydrogen electrode (RHE), which allows the thermodynamically uphill reaction to occur in the electrolyzer. [5] However, the unfavorable thermodynamics and resulting large overpotential are the main barriers to the scalable implementation of water electrolysis for hydrogen generation. [6,7] Currently, noble metal-based electrocatalysts exhibit the most efficient activity for water splitting, particularly Pt-based hydrogen evolution reaction (HER) catalysts and Ir/Ru-based oxygen evolution reaction (OER) catalysts. [8,9] Nevertheless, the scarcity and high price of precious metals severely impede their widespread use in commercial water-splitting applications. Taking these limitations into Electrochemical water splitting has attracted significant attention as a key pathway for the development of renewable energy systems. Fabricating efficient electrocatalysts for these processes is intensely desired to reduce their overpotentials and facilitate practical applications. Recently, metal-organic framework (MOF) nanoarchitectures featuring ultrahigh surface areas, tunable nanostructures, and excellent porosities have emerged as promising materials for the development of highly active catalysts for electrochemical water splitting. Herein, the most pivotal advances in recent research on engineering MOF nanoarchitectures for efficient electrochemical water splitting are presented. First, the design of catalytic centers for MOF-based/derived electrocatalysts is summarized and compared from the aspects of chemical composition optimization and structural functionalization at the atomic and molecular levels. Subsequently, the fast-growing breakthroughs in catalytic activities, identification of highly active sites, and fundamental mechanisms are thoroughly discussed. Finally, a comprehensive commentary on the current primary challenges and future perspectives in water splitting and its commercialization for hydrogen production is provided. Hereby, new insights into the synthetic principles and electrocatalysis for designing MOF nanoarchitectures for the practical utilization of water splitting are offered, thus further promoting their future prosperity for a wide range of applications.

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Section: Metal-and Alloy-doped Carbon Electrocatalystsmentioning

confidence: 99%

Section: Catalysts For the Oxygen Evolution Reactionmentioning

confidence: 99%

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

et al. 2021

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“…Electrochemical water splitting is considered as one of the most promising way to produce hydrogen [1-3], which composes of hydrogen evolution reaction (HER) of cathodic half-reaction and oxygen evolution reaction (OER) of anodic half-reaction [4][5][6][7][8][9][10][11]. Acid polymer electrolyte membrane water electrolyzer (PEMWE) is the most popular technique towards the production of hydrogen and oxygen fuels [12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical iridium-based multimetallic alloy with double-core-shell architecture for efficient overall water splitting

et al. 2019

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The overall water splitting for hydrogen production is an effective strategy to resolve the environmental and energy crisis. Here, we report a facile approach to synthesize the Ir-based multimetallic, hierarchical, double-coreshelled architecture (HCSA) assisted by oil bath reaction for boosting overall water splitting in acidic environment. The IrNiCu HCSA shows superior electrocatalytic activity for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), which are comparable to commercial Pt/C and better than IrO 2. The IrNiCu HCSA exhibits remarkably catalytic efficiency as bifunctional catalyst for overall water splitting where a low cell voltage of 1.53 V is enough to drive a current density of 10 mA cm −2 and maintains stable for at least 20 h. The presented work for the design and synthesis of novel Ir-based multimetallic architecture paves the way for highperformance overall water splitting catalysis.

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“…Nano-teknologi adalah topik yang sangat beragam, tetapi beberapa contoh terbaik dari R & D nanoscale yang ada daerah heterostruktur epitaxial untuk laser dioda dan LED yang dikembangkan oleh CVD. Banyak dari perangkat ini mengandung dua dimensi (2-D) Sumur kuantum atau superlattices terdiri dari lapisan epitaxial tegang yang tebal 1-10 nm.Contoh.Selain sumur kuantum, struktur laser seperti permukaan rongga vertikal memancarkan laser (VCSEL) berisi tumpukan cermin terdiri dari sejumlah besar lapisan dengan bahan semikonduktor yang Tebal biasanya 50-100 nm (161)(162)(163)(164). Ketebalan setiap lapisan seringkali harus dikontrol dengan presisi yang lebih baik dari 1 nm.Meskipun persyaratan ini perangkat dapat tumbuh secara rutin dengan relatif hasil tinggi dalam OMVPE tersetel dan terkalibrasi reactor (62; 113; 165; 166).…”

Section: B Aplikasi Chemical Vapor Deposisiunclassified

A Review CHEMICAL VAPOR DEPOSITION : PROCESS AND APPLICATION

Dinata¹,

Rosyadi²,

Hamid³

et al. 2018

Preprint

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Chemical Vapor Deposition merupakan metode deposisi yang digunakan untuk menghasilkan bahan padat berkualitas tinggi dan berkinerja tinggi yang biasanya dibawah vakum. Tujuan review ini adalah untuk mengetahui proses dan teknik dari Chemical Vapor Deposition. Prinsip kerja dari Chemical Vapor Deposition yaitu proses pengendapan senyawa/ unsur terjadi akibat reaksi dekomposisi kimia akibat aktivasi termal di seputar komponean yang dilapisi. Beberapa material yang dihasilkan dengan menggunakan metode Chemical Vapor Deposition ini adalah berlian sintesis, thin film coating, lapisan emas dengan ketebalan yang tipis.

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Microwave-assisted CVD-like synthesis of dispersed monolayer/few-layer N-doped graphene encapsulated metal nanocrystals for efficient electrocatalytic oxygen evolution

Abstract: A novel CVD-like synthetic strategy was developed to realize ultrafast synthesis of a series of monolayer/few-layer N-doped graphene encapsulated metal nanocrystals with excellent electrocatalytic oxygen evolution performance.

Cited by 49 publications

References 31 publications

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

Hierarchical iridium-based multimetallic alloy with double-core-shell architecture for efficient overall water splitting

A Review CHEMICAL VAPOR DEPOSITION : PROCESS AND APPLICATION

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