Facile construction of N-doped carbon nanotubes encapsulating Co nanoparticles as a highly efficient multifunctional catalyst for electrochemical reactions

Chao, Shujun; Liu, Ping; Xia, Qingyun; Liu, Shuang; Chen, WenGe; Li, Wenge

doi:10.1039/d0ce01614d

Cited by 7 publications

(6 citation statements)

References 32 publications

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Section: Hollow Structuresmentioning

confidence: 99%

“…Nevertheless, hollow micro-and nanostructures can be fabricated using mixed solvents, postsynthesis alterations, and hard, soft, sacrificial, and template-free processes (Figure 4c). [58,61] Additionally, Ostwald ripening, the Kirkendall effect, galvanic replacement, solid-state disintegration, and chemical etching can produce hollow structures. [58,61] Volatilization of metals from ZnAl-LDH@ZIF-67 generates mesoporous C nanosheets.…”

Section: Hollow Structuresmentioning

confidence: 99%

“…[58,61] Additionally, Ostwald ripening, the Kirkendall effect, galvanic replacement, solid-state disintegration, and chemical etching can produce hollow structures. [58,61] Volatilization of metals from ZnAl-LDH@ZIF-67 generates mesoporous C nanosheets. [62] Similarly, honeycomb-like porous frameworks were observed for CoAl-LDH, CoAl-LDH@ZIF-67, and LDH@ ZIF-67-800 (Figure 4d).…”

Section: Hollow Structuresmentioning

confidence: 99%

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Superstructures of Zeolitic Imidazolate Frameworks to Single‐ and Multiatom Sites for Electrochemical Energy Conversion

Patil

Liu

Yadav

et al. 2022

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The exploration of electrocatalysts with high catalytic activity and long‐term stability for electrochemical energy conversion is significant yet remains challenging. Zeolitic imidazolate framework (ZIF)‐derived superstructures are a source of atomic‐site‐containing electrocatalysts. These atomic sites anchor the guest encapsulation and self‐assembly of aspheric polyhedral particles produced using microreactor fabrication. This review provides an overview of ZIF‐derived superstructures by highlighting some of the key structural types, such as open carbon cages, 1D superstructures, hollow structures, and the interconversion of superstructures. The fundamentals and representative structures are outlined to demonstrate the role of superstructures in the construction of materials with atomic sites, such as single‐ and dual‐atom materials. Then, the roles of ZIF‐derived single‐atom sites for the electroreduction of CO2 and electrochemical synthesis of H2O2 are discussed, and their electrochemical performance for energy conversion is outlined. Finally, the perspective on advancing single‐ and dual‐atom electrode‐based electrochemical processes with enhanced redox activity and a low‐impedance charge‐transfer pathway for cathodes is provided. The challenges associated with ZIF‐derived superstructures for electrochemical energy conversion are discussed.

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Section: Hollow Structuresmentioning

confidence: 99%

Section: Hollow Structuresmentioning

confidence: 99%

Section: Hollow Structuresmentioning

confidence: 99%

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Superstructures of Zeolitic Imidazolate Frameworks to Single‐ and Multiatom Sites for Electrochemical Energy Conversion

Patil

Liu

Yadav

et al. 2022

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“…Researchers are currently focusing on developing non-precious-metal electrocatalysts. Carbides produced from first transition series metals, sulfides, and other compounds have shown promise for use in water electrolysis. − Cobalt, for example, is abundant, inexpensive, and has a unique 3d electron configuration. Its derivatives, such as cobalt oxide, cobalt sulfide, cobalt selenide, and cobalt nitride, have piqued researchers’ interest as catalysts because of their superior electrochemical properties. − Transition-metal sulfide (TMS) has attracted a lot of attention because of its low cost, strong catalytic activity, outstanding operational stability, and especially its distinctive 2D layer. − The 2D nanosheets, on the other hand, will experience irreversible aggregation due to van der Waals pressure, drastically reducing the specific surface area and affecting their electrochemical characteristics. − As a result, one of the viable ways of exploring efficient electrocatalysts is to develop matching sulfide materials utilizing effective templates. − …”

Section: Introductionmentioning

confidence: 99%

Highly Effective OER Electrocatalysts Generated from a Two-Dimensional Metal–Organic Framework Including a Sulfur-Containing Linker without Doping

Han

et al. 2022

Inorg. Chem.

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Metal−organic frameworks (MOFs) with different topologies formed by the self-assembly of sulfur-containing inorganic ligands, cobalt ions, and large ligands can be used to prepare electrocatalysts for water splitting in order to fully explore the advantages of MOFs in terms of structural tailoring and quantitative assembly. It is possible to avoid using an extradoped sulfur source to reduce waste as well as to disperse Co and sulfur elements evenly and controllably throughout the final material to maximize the overall synergistic effect. In this work, different kinds of bimetallic MOF materials containing sulfur can be synthesized very conveniently by using an economical and practical diffusion method. These materials are directly used as OER electrocatalysts, and the bimetallic MOFs have the best electrocatalytic performance when the ratio of Co to Fe is 6:4. The overpotential at a current density of 10 mA cm −2 was 260 mV, with a Tafel slope of 56 mV dec −1 and good stability. It was assembled with 20% commercial Pt/C material into a two-electrode system for all-water decomposition, and the decomposition voltage at 10 mA cm −2 was 1.81 V. From the electronic configuration microscopic point of view, the introduction of iron ions changed the original synergistic effect for Co−S−Co, which more easily led to the formation of high-valence Co 3+ and finally produced highly active electrocatalytic sites. From a macroscopic point of view, the material produced in situ during the electrochemical reaction process not only retains the original 2D layered structure but also utilizes bubbles to produce a loose structure with defective sites. These structural features are advantageous because they provide not only an abundance of active sites and permeable channels but also the necessary interfaces and electron-transport channels for the formation of electrostatic charge-separation layers, making it easier to intercalate and delaminate the hydroxide ions. Furthermore, the changed hydroxyl ions and nitrogen and sulfur atoms on the channel surface may operate as interaction sites, increasing the surface characteristics, facilitating electron transfer, and reducing electron-transfer resistance. To summarize, the rational design of sulfurcontaining layered MOF materials directly as water-splitting catalysts is a crucial next step in developing cost-effective, environmentally friendly, and low-energy-consumption electrocatalysts based on the findings of this study.

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“…Electrically driven water splitting to produce clean hydrogen fuel is a promising renewable energy conversion technology. [1][2][3][4][5][6] Efficient water decomposition requires electrocatalysts with activity for the hydrogen evolution reaction and oxygen evolution reaction. [7][8][9][10] Compared with the two-electron hydrogen evolution process, the kinetics of the four-electron OER process is slower, and the sluggish kinetics of OER has been a bottleneck.…”

Section: Introductionmentioning

confidence: 99%

A highly active oxygen evolution electrocatalyst derived from Co/Ni-succinic acid framework under mild conditions

Han

et al. 2022

CrystEngComm

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Facile construction of N-doped carbon nanotubes encapsulating Co nanoparticles as a highly efficient multifunctional catalyst for electrochemical reactions

Abstract: A multifunctional electrocatalyst, N-doped carbon nanotubes encapsulating Co nanoparticles (Co@NCNTs), has been synthesized by a facile solid-phase precursor pyrolysis method. It displays high performance for the ORR, OER and HER in alkaline medium.

Cited by 7 publications

References 32 publications

Superstructures of Zeolitic Imidazolate Frameworks to Single‐ and Multiatom Sites for Electrochemical Energy Conversion

Superstructures of Zeolitic Imidazolate Frameworks to Single‐ and Multiatom Sites for Electrochemical Energy Conversion

Highly Effective OER Electrocatalysts Generated from a Two-Dimensional Metal–Organic Framework Including a Sulfur-Containing Linker without Doping

A highly active oxygen evolution electrocatalyst derived from Co/Ni-succinic acid framework under mild conditions

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