Free-standing vertically-aligned nitrogen-doped carbon nanotube arrays/graphene as air-breathing electrodes for rechargeable zinc–air batteries

Cai, Xiaoyi; Xia, Bao Yu; Franklin, Joseph B.; Li, Baosheng; Wang, Xin; Wang, Zhan; Chen, Luwei; Lin, Jianyi; Lai, Linfei; Shen, Zexiang

doi:10.1039/c6ta09615h

Cited by 84 publications

(34 citation statements)

References 35 publications

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“…In the N 1s spectra, amine, pyridinic, pyrrolic, graphitic, nitrate, and metal nitride are existent, corresponding to binding energies 398.67, 399.42, 400.17, 401.23, and 398 eV, respectively. [ 18 ] In consideration of the evidence of pyridinic‐, pyrrolic‐, and graphitic‐N and metal nitirde, the N atoms confirm the incorporation of N atoms into graphene networks for NCS@N‐rGO/NF. While, for the spectrum of O 1s, it can be deconvoluted into metal–O, organic C–O, metal–C–O and organic CO component peaks.…”

Section: Resultsmentioning

confidence: 98%

Vertically Aligned NiCo₂S₄ Nanosheets Deposited on N‐Doped Graphene for Bifunctional and Durable Electrode of Overall Water Splitting

Lee

Pan

Gund

et al. 2020

Adv Materials Inter

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electrocatalysts, which contain both HER and OER activities, has advantages in terms of simplified symmetric cell design and reduced cost. [3] However, the practical applications of noble metal-based materials are still restricted due to high price, rarity, poor durability, and lopsided bifunctional activity.Recently, transition metal-based materials have been exploited as HER or OER electrocatalysts to replace existing noble metals. [4] Transitional metal sulfides (TMSs) consisting of ternary compounds exhibit the synergistic cooperation of the different components for high electrocatalytic activity. [5,6] Nevertheless, bifunctional activity and durability of TMSs still remain unsatisfactory for overall water splitting. [7] Moreover, the binderfree self-supported configuration can reduce the contact resistance between the current collector and the electrocatalysts, minimizing the loading of inactive species. [6,8] Herein, we design vertically aligned NiCo 2 S 4 nanosheets deposited on nitrogen-incorporated reduced graphene oxide (N-rGO) coated nickel foam (NCS@N-rGO/NF) for overall water splitting. The resulting binder-free free-standing electrodes exhibit the vertical growth of NiCo 2 S 4 nanosheets on the modified surface of the N-rGO/Ni foam, which ensures the exposure of the active sites and facile charge transfer. [9] Moreover, a rapid mass transport and facile access to active sites is accomplished by 3D interconnected porous structure. The electrocatalytic activity can be further improved due to the synergistic effects of the interaction between TMS with rGO in a hierarchical structure. [10] Furthermore, heteroatom-doped carbon materials such as N-rGO can improve the electron conductivity and electrolysis durability of TMSs. [11] Result and DiscussionThe binder-free NCS@N-rGO/NF electrodes were synthesized in three-steps as shown in Figure 1. First, rGO was coated on NF using a hydrothermal method at 393 K for 2 h. Then, N atoms were incorporated to fabricate N-rGO/NF electrode through chemical vapor deposition (CVD) using urea as N precursor. The CVD was performed at 623 and 773 K, successively, where urea is gasified at 623 K and adsorbed on rGO/NF, then N doping is done at 773 K. Finally, NiCo 2 S 4 nanosheets Developing non-noble metal electrocatalysts with high catalytic activity and stability is very important for practical water splitting technology. Herein, electrocatalytically active, bifunctional, and durable electrodes, are reported where NiCo 2 S 4 nanosheets deposited onto nitrogen-incorporated reduced graphene oxide (N-rGO) are assembled onto 3D Ni foam. These freestanding binder-free electrodes exhibit excellent bifunctional catalytic activity for both hydrogen evolution and oxygen evolution reactions in alkaline condition, as well as overall water splitting reaction measured in a two-electrode configuration. The cell voltage is as low as 1.63 V to achieve a current density of 10 mA cm −2 and this value is well preserved with negligible overpotential for more than 50 h. The results open ...

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Section: Resultsmentioning

confidence: 98%

Vertically Aligned NiCo₂S₄ Nanosheets Deposited on N‐Doped Graphene for Bifunctional and Durable Electrode of Overall Water Splitting

Lee

Pan

Gund

et al. 2020

Adv Materials Inter

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“…Originating from the high OER activity of Co 4 N and ORR activity of Co–N–C as well as a stable 3D‐interconnected conductive network, the Co 4 N/CNW/CC electrode presented high efficiency and stability in the assembled rechargeable Zn–air batteries with a low discharge–charge overpotential (1.09 V at 50 mA cm −2 ) and 408 pulse cycles (Figure j). Except the commercial carbon substrates, some homemade integrated carbon substrates have also been developed . For instance, Li and co‐workers utilized a lightweight, conductive, and cross‐linked aerogel film of CNTs functioning as a 3D catalyst‐supporting scaffold for bifunctional cobalt (II/III) oxides and as a current collector ( Figure a,b).…”

Section: Integrated Air Electrodes and Flexible Zn–air Batteriesmentioning

confidence: 99%

Recent Advances toward the Rational Design of Efficient Bifunctional Air Electrodes for Rechargeable Zn–Air Batteries

Meng

Liu

Zhang

et al. 2018

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168

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Large-scale application of renewable energy and rapid development of electric vehicles have brought unprecedented demand for advanced energy-storage/conversion technologies and equipment. Rechargeable zinc (Zn)-air batteries represent one of the most promising candidates because of their high energy density, safety, environmental friendliness, and low cost. The air electrode plays a key role in managing the many complex physical and chemical processes occurring on it to achieve high performance of Zn-air batteries. Herein, recent advances of air electrodes from bifunctional catalysts to architectures are summarized, and their advantages and disadvantages are discussed to underline the importance of progress in the evolution of bifunctional air electrodes. Finally, some challenges and the direction of future research are provided for the optimized design of bifunctional air electrodes to achieve high performance of rechargeable Zn-air batteries.

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“…The surface carbon layer in the encapsulation structure not only prevents oxidation and aggregation of transition metal nanoparticles in the electrocatalytic process but also captures electrons from metal nanoparticles . In addition, the doping of nitrogen into carbon lattices can further promote the electron transfer to the adjacent carbon atoms . Such a synergetic effect stimulates an excellent electrocatalytic activity and stability on carbon shells .…”

Section: Introductionmentioning

confidence: 99%

2D Dual‐Metal Zeolitic‐Imidazolate‐Framework‐(ZIF)‐Derived Bifunctional Air Electrodes with Ultrahigh Electrochemical Properties for Rechargeable Zinc–Air Batteries

Wang

Kou

Liu

et al. 2017

Adv Funct Materials

366

196

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Here first a 2D dual-metal (Co/Zn) and leaf-like zeolitic imidazolate framework (ZIF-L)-pyrolysis approach is reported for the low-cost and facile preparation of Co nanoparticles encapsulated into nitrogen-doped carbon nanotubes (Co-N-CNTs). Importantly, the reasonable Co/Zn molar ratio in the ZIF-L is the key to the emergence of the encapsulated microstructure. Specifically, high-dispersed cobalt nanoparticles are fully encapsulated in the tips of N-CNTs, leading to the full formation of highly active Co-N-C moieties for oxygen reduction and evolution reactions (ORR and OER). As a result, the obtained Co-N-CNTs present superior electrocatalytic activity and stability toward ORR and OER over the commercial Pt/C and IrO 2 as well as most reported metal-organic-framework-derived catalysts, respectively. Remarkably, as bifunctional air electrodes of the Zn-air battery, it also shows extraordinary charge-discharge performance. The present concept will provide a guideline for screening novel 2D metal-organic frameworks as precursors to synthesize advanced multifunctional nanomaterials for cross-cutting applications.

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Free-standing vertically-aligned nitrogen-doped carbon nanotube arrays/graphene as air-breathing electrodes for rechargeable zinc–air batteries

Abstract: A free-standing vertically aligned CNT array supported on graphene foam is used as an air-breathing electrode for rechargeable Zn–air batteries.

Cited by 84 publications

References 35 publications

Vertically Aligned NiCo₂S₄ Nanosheets Deposited on N‐Doped Graphene for Bifunctional and Durable Electrode of Overall Water Splitting

Vertically Aligned NiCo₂S₄ Nanosheets Deposited on N‐Doped Graphene for Bifunctional and Durable Electrode of Overall Water Splitting

Recent Advances toward the Rational Design of Efficient Bifunctional Air Electrodes for Rechargeable Zn–Air Batteries

2D Dual‐Metal Zeolitic‐Imidazolate‐Framework‐(ZIF)‐Derived Bifunctional Air Electrodes with Ultrahigh Electrochemical Properties for Rechargeable Zinc–Air Batteries

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Free-standing vertically-aligned nitrogen-doped carbon nanotube arrays/graphene as air-breathing electrodes for rechargeable zinc–air batteries

Abstract: A free-standing vertically aligned CNT array supported on graphene foam is used as an air-breathing electrode for rechargeable Zn–air batteries.

Cited by 84 publications

References 35 publications

Vertically Aligned NiCo2S4 Nanosheets Deposited on N‐Doped Graphene for Bifunctional and Durable Electrode of Overall Water Splitting

Vertically Aligned NiCo2S4 Nanosheets Deposited on N‐Doped Graphene for Bifunctional and Durable Electrode of Overall Water Splitting

Recent Advances toward the Rational Design of Efficient Bifunctional Air Electrodes for Rechargeable Zn–Air Batteries

2D Dual‐Metal Zeolitic‐Imidazolate‐Framework‐(ZIF)‐Derived Bifunctional Air Electrodes with Ultrahigh Electrochemical Properties for Rechargeable Zinc–Air Batteries

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Vertically Aligned NiCo₂S₄ Nanosheets Deposited on N‐Doped Graphene for Bifunctional and Durable Electrode of Overall Water Splitting

Vertically Aligned NiCo₂S₄ Nanosheets Deposited on N‐Doped Graphene for Bifunctional and Durable Electrode of Overall Water Splitting