Surface confinement assisted synthesis of nitrogen-rich hollow carbon cages with Co nanoparticles as breathable electrodes for Zn-air batteries

Chen, Zuanguang; Hu, Lijun; Wang, Nan; Li, Yanmin; Zhao, Dengke; Li, Ligui; Peng, Xinwen; Cui, Zhiming; Ma, Lijun; Tian, Yong; Wang, Xiufang

doi:10.1016/j.apcatb.2019.04.064

Cited by 99 publications

(42 citation statements)

References 66 publications

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“…[64,65] Through the pyrolysis of MOFs in the presence of carbon or external reductive agents, metal ions around organic ligands (e.g., Co, Ni, and Fe ions) could be reduced in situ to metal or alloy nanoparticles encapsulated in a heteroatom-doped carbon frame, which exhibits excellent catalytic performance and stability owing to its highly adjustable metal composition and robust carbon structure. [66][67][68][69][70][71] As representatives of MOFs, there are many reports about zeolite imidazole frameworks (ZIFs) as precursors to prepare metal-nitrogen-carbon electrocatalysts, [24,[72][73][74][75][76][77][78][79][80][81] for instance, the porous cage structure of N-doped carbon nanotubes (NCNTs) synthesized via the simple pyrolysis of polyhedral ZIF-67 particles. [72] Thus, enhanced electrocatalytic performance and durability for the ORR and OER were observed, which were mainly attributed to the synergistic effect between the N dopants and restricted Co nanoparticles in the CNTs, the NCNTs structure, and the rugged porous cage structure.…”

Section: Metal-and Alloy-doped Carbon Electrocatalystsmentioning

confidence: 99%

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%

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

et al. 2021

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“…Note that the small peak appeared at about + 0.821 V in the LSV curve of Ni 50 Fe 50 @N-CNTs, i. e. before the limiting current plateau, comes from the reduction of dissolved oxygen in the abundant pores of this sample. [35,36] Then, the LSV polarization curves with various rotation rate from 400 rpm and 2500 rpm were carried out ( Figure S9), where the current density increased with the increasing of the rotation rate for all the samples. The inset corresponding Koutecky-Levich (KÀ L) plot in each figure in Figure S9 displayed an excellent linearity with rather consistent slope in the potential window from 0.41 V to 0.59 V, suggesting a first-order reaction kinetics with regard to the concentration of the dissolved oxygen in the solution.…”

Section: Resultsmentioning

confidence: 99%

NiFe Alloyed Nanoparticles Encapsulated in Nitrogen Doped Carbon Nanotubes for Bifunctional Electrocatalysis Toward Rechargeable Zn‐Air Batteries

et al. 2019

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Developing cost-effective, efficient and durable electrocatalysts to replace the high cost and low poison resistant platinumgroup-metal (PGM) catalysts to boost the oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) is critical for promoting the practical performance of zinc-air batteries (ZABs). Herein, a series of NiFe alloyed nanoparticles encapsulated in nitrogen-doped carbon nanotubes (Ni x Fe 100À x @N-CNTs, where x denotes the Ni ratio in NiFe alloys) have been fabricated as bifunctional catalysts for both OER and ORR. Among the series, the Ni 50 Fe 50 @N-CNTs sample exhibited the best oxygen reversible electrocatalytic performance, of which it possessed an overpotential of 318 mV at 10 mA cm À 2 for OER and a half-wave potential of 0.86 V for ORR. The ZAB cell using Ni 50 Fe 50 @N-CNTs as an air-cathode also showed a power density of 203.6 mW cm À 2 , and a specific capacity of 778 mA h g À 1 , outperforming the noble-metal-based Pt/C + IrO 2 catalyst. In addition, such ZAB cell also demonstrated a superlong stable rechargeability over 200 h without structural deterioration, presenting promises for pushing forward into practical applications.

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“…Benefiting from the conservation of the polyhedron-like morphology of ZIF-67 crystals, the sample displayed a high surface area and rich mesoporous structure, which is conductive to expose the catalytic active sites and facilitate the mass transfer process, resulting in efficient oxygen reversible electrocatalysis. When served as an air-breathable electrode in a aqueous Zn-air battery, it showed a much higher open circuit voltage of 1.49 V than the commercial Pt/C catalyst, as well as a maximum discharge power density of 248 mW cm −2 at 10 mA cm −2 and only a slight increase in the charge-discharge voltage gap after continuously cycling for 12 h. [170] The N, S-codoped-carbonconfined Co 9 S 8 nanoparticles (IOSHs-NSC-Co 9 S 8 ) have been reported as a high-efficient bifunctional electrocatalysts at aircathode for on-chip all-solid-state rechargeable Zn-air batteries (OAR-ZABs) utilized polyacrylamide-co-polyacrylic acid alkalinous hydrogel as solid electrolyte. And the AR-ZABs achieved a higher open circuit voltage of 1.408 V, outstanding capacity of 738 mAh g −1 and durable cycling life of 105 cycles/35 h, surpassing most reported devices using traditional PVA basic hydrogel electrolyte.…”

Section: (24 Of 30)mentioning

confidence: 99%

Intrinsic Structure Modification of Electrode Materials for Aqueous Metal‐Ion and Metal‐Air Batteries

Ling

Wang

Chen

et al. 2020

Adv Funct Materials

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In consideration of low cost, simple operation, safe reliability, and environmental benignity, aqueous rechargeable batteries (ARBs) have attracted great interest among portable electronic devices, energy storage, and power source batteries. As the key components of ARBs, the electrode materials lead to a crucial effect for the overall battery properties, such as working voltage, electrocatalytic activity, capacity, and cycling stability. However, owing to the highly reactive aqueous environment, the electrode materials typically demonstrate a series of issues, including active material dissolution, structural instability, and poor catalytic activity, restricting their application. So far, several researchers have devoted much effort to improve the properties of electrode materials for ARBs. In particular, intrinsic structure modification in terms of vacancy regulation, interlayer engineering, and element doping have been applied to optimize the electronic and phase structure of electrode materials, contributing to elevated ion diffusion, fast charge transfer, and adequate active sites for electrochemical reaction. In this review, recent reports are demonstrated about the intrinsic structure modification of electrode materials in aqueous metal‐ion and metal‐air batteries, focusing on various regulation strategies and functional mechanisms. Finally, a brief conclusion and perspective is presented to demonstrate constructive suggestions and opinions for further research.

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Surface confinement assisted synthesis of nitrogen-rich hollow carbon cages with Co nanoparticles as breathable electrodes for Zn-air batteries

Cited by 99 publications

References 66 publications

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

Designing MOF Nanoarchitectures for Electrochemical Water Splitting

NiFe Alloyed Nanoparticles Encapsulated in Nitrogen Doped Carbon Nanotubes for Bifunctional Electrocatalysis Toward Rechargeable Zn‐Air Batteries

Intrinsic Structure Modification of Electrode Materials for Aqueous Metal‐Ion and Metal‐Air Batteries

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