Nano‐RuO<sub>2</sub>‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

Zhai, Shengli; Wang, Chaojun; Karahan, H. Enis; Wang, Yanqing; Chen, Xuncai; Sui, Xiao; Huang, Qianwei; Liao, Xiaozhou; Wang, Xin; Chen, Yuan

doi:10.1002/smll.201800582

Cited by 122 publications

(70 citation statements)

References 92 publications

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“…ZnFC‐PAA delivers a maximum energy density of 48.5 mWh cm −3 at the power density of 179.9 mW cm −3 , and can retain more than 70% of its energy density of 34 mWh cm −3 at an ultrahigh power density of 3598.9 mW cm −3 . To the best of our knowledge, the ZnFC‐PAA displays the highest energy storage performance among all Zn‐ion hybrid capacitors reported so far, it also surpasses many FCs based on various carbon composite fiber electrodes, including rGO/CNT fiber (3.1 mWh cm −3 at 400 mW cm −3 ), MnO 2 /CNT fiber (11.7 mWh cm −3 at 167.7 mW cm −3 ), HrGO/CNT@RuO 2 fiber (27.3 mWh cm −3 at 2954 mW cm −3 ), Mxene/rGO fiber (5.1 mWh cm −3 at 1700 mW cm −3 ), and MoS 2 ‐rGO/CNT fiber (7 mWh cm −3 at 1670 mW cm −3 ) . Its performance is also better than that of phosphorene and graphene‐based interdigital in‐plane SCs (11.6 mWh cm −3 at 1500 mW cm −3 ) .…”

Section: Resultsmentioning

confidence: 91%

Flexible Zinc‐Ion Hybrid Fiber Capacitors with Ultrahigh Energy Density and Long Cycling Life for Wearable Electronics

Zhang

Pei

Wang

et al. 2019

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Emerging wearable electronics require flexible energy storage devices with high volumetric energy and power densities. Fiber‐shaped capacitors (FCs) offer high power densities and excellent flexibility but low energy densities. Zn‐ion capacitors have high energy density and other advantages, such as low cost, nontoxicity, reversible Faradaic reaction, and broad operating voltage windows. However, Zn‐ion capacitors have not been applied in wearable electronics due to the use of liquid electrolytes. Here, the first quasisolid‐state Zn‐ion hybrid FC (ZnFC) based on three rationally designed components is demonstrated. First, hydrothermally assembled high surface area and conductive reduced graphene oxide/carbon nanotube composite fibers serve as capacitor‐type positive electrodes. Second, graphite fibers coated with a uniform Zn layer work as battery‐type negative electrodes. Third, a new neutral ZnSO4‐filled polyacrylic acid hydrogel act as the quasisolid‐state electrolyte, which offers high ionic conductivity and excellent stretchability. The assembled ZnFC delivers a high energy density of 48.5 mWh cm−3 at a power density of 179.9 mW cm−3. Further, Zn dendrite formation that commonly happens under high current density is efficiently suppressed on the fiber electrode, leading to superior cycling stability. Multiple ZnFCs are integrated as flexible energy storage units to power wearable devices under different deformation conditions.

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Section: Resultsmentioning

confidence: 91%

Flexible Zinc‐Ion Hybrid Fiber Capacitors with Ultrahigh Energy Density and Long Cycling Life for Wearable Electronics

Zhang

Pei

Wang

et al. 2019

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“…Energy and power densities of representative 1D SCs assembled by pairing two EDLC electrodes or two pseudocapacitive electrodes in symmetric configurations, or one EDLC electrode and one pseudocapacitive electrode in asymmetric configurations . Several commercial SCs (PCAP0050 P230 S01, BCAP0050 P270 S01, Maxwell), high‐performance 2D SCs and 1D batteries are shown as references.…”

Section: Electrochemical Performance Of 1d Scsmentioning

confidence: 99%

1D Supercapacitors for Emerging Electronics: Current Status and Future Directions

et al. 2019

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considering their potential for performing even more complex functions. In particular, the recent booming of the "internet of things" and "artificial intelligence" further encourages the development of a new generation of wearable devices. [4] Accordingly, we need reliable and compact yet high-performance energy storage systems to power emerging electronics. Plus, the mechanical characteristics of the systems should support a pleasant user experience in terms of wearability. Recently, the 1D energy storage devices, especially 1D supercapacitors (SCs), have emerged as a promising candidate. [5][6][7][8][9][10][11] 1D SCs are elongated (fiber/yarn/wire/ cable-like) structures with dimensions typically ranging from tens to hundreds of micrometers in diameter, and several millimeters to meters in length. Their 1D structures offer various advantages over their conventionally rigid and bulky counterparts: 1) they show a higher degree of mechanical flexibility (which helps withstand long-term and repetitive deformations); 2) allow easy scaling up by self-integration (which is useful for meeting a wide range of power requirements); 3) are easily packed into small spaces with diverse shapes (which brings design versatility); and 4) have shape advantage for integrating with other 1D devices (which is preferable for the fabrication of multifunctional wearable systems). [5,9,10,12] Further, 1D SCs also have several potential advantages over other emerging 1D energy storage devices, especially, 1D batteries. 1) 1D SCs have unique energy storage characteristics. They can provide superior power density and faster charging/discharging rates than 1D batteries. Also, their energy density is gradually catching up that of 1D batteries with the uses of intercalative and extrinsic pseudocapacitive materials in electrodes. [13] 2) 1D SCs are often superior in their safety and environmental friendliness. Batteries, e.g., Li-ion batteries, typically comprise of hazardous, organic electrolytes, which is harmful to the human body if they leak. Organic electrolytes are also prone to fire or even explosion. In contrast, 1D SCs based on aqueous polymer gel electrolytes are much safer and more environmentally friendly. 3) 1D SCs may work in a wider operating temperature window when suitable electrolytes are used, which extends their potential usages in emerging electronics at different environmental conditions. In contrast, redox reactions in batteries often can only work in a narrow temperature window. 4) 1D SCs may offer longer lifespan to avoid frequent battery replacement in practical application. [14,15] 1D supercapacitors (SCs) have emerged as promising candidates to power emerging electronics in recent years because of their unique advantages in energy storage and mechanical flexibility. There are four main research fronts in the development of 1D SCs: 1) enhancing mechanical characteristics, 2) achieving superior electrochemical performance, 3) enabling multiple device integration, and 4) demonstrating multifunctionality. Here, a brief...

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“…Apart from increasing faradaic contributions, pseudocapacitive materials as well as asymmetrical electrode configurations were also introduced to further improve the capacitance . An asymmetrical fiber SC was constructed by choosing a carbon fiber with electrodeposited ultrathin MnO 2 nanosheets arrays as the positive electrode and a second carbon fiber with dip‐coated graphene as the negative electrode .…”

Section: Progress In the Application Of Gbfsmentioning

confidence: 99%

Graphene‐Based Fibers: Recent Advances in Preparation and Application

Zhang

2019

Advanced Materials

109

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investigated [17][18][19][20] for building graphene-based fibers (GBFs) over recent years. [21][22][23] These unique macroscopic 1D assemblies of microscopic 2D graphene building blocks are of lightweight, high specific surface area (SSA), and remarkable mechanical and electrical properties, thus qualifying them as ideal materials for fiber electronics. [14,[24][25][26] Currently, the well-developed wet-spinning method is widely adopted in preparing GBFs, [27,28] while newly designed spinning methods with microfluidic spinnerets and different kinds of coagulation bath have yielded GBFs with novel structures and functions. Apart from these methods, emerging techniques such as chemical vapor deposition (CVD) and twisting have been developed to meet different applications of GBFs in strain sensors, stretchable SC, and multifunctional actuators. [9,29,30] Together with the evolution in their preparation, mechanical and electrical properties of GBFs have been considerably enhanced since their debut. Bioinspired strengthening and toughening strategies for membranes have been found to work for GBFs as well, and atomic doping methods have efficiently increased electrical conductivity of GBFs to a record value of 2.2 × 10 7 S m −1 , [31] which is even comparable to that of certain metals such as nickel (1.5 × 10 7 S m −1 ) and aluminum (3.5 × 10 7 S m −1 ). Based on their novel structures and significantly enhanced mechanical/electrical properties, GBFs have found their substantial uses particularly in newly designed, high-performance electrochemical devices for energy conversion and storage.Several excellent reviews have witnessed the rapid development of GBFs. [17,20,23] For example, Chou and co-workers [18] previously gave a comprehensive review on the synthesis, device performance, and potential applications of GBFs. Another review presented by Gao and his colleagues [32] focused on the microscopic mechanism during liquid crystal formation and summarized its effects on producing continuous fibers. Additionally, applications of GBFs in flexible/ wearable SCs and bioinspired nanocomposites were specifically discussed by Huang et al. [25] and Cheng and co-workers, [33] respectively. In this featured article, we mainly focus on very recent research advances in GBFs over the past few years and introduce progresses in preparation techniques, strategies for performance enhancement and novel applications (Figure 1), aiming to provide a state-of-the-art update for GBFs as well as perspectives for their future development.Graphene-based fibers (GBFs) are macroscopic 1D assemblies formed by using microscopic 2D graphene sheets as building blocks. Their unique structure exhibits the same merits as graphene such as low weight, high specific surface area, excellent mechanical/electrical properties, and ease of functionalization. Furthermore, the fibrous nature of GBFs is intrinsically compatible with existing textile technologies, making them suitable for applications in flexible and wearable electronics. Recently, novel synthetic ...

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Nano‐RuO₂‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

Cited by 122 publications

References 92 publications

Flexible Zinc‐Ion Hybrid Fiber Capacitors with Ultrahigh Energy Density and Long Cycling Life for Wearable Electronics

Flexible Zinc‐Ion Hybrid Fiber Capacitors with Ultrahigh Energy Density and Long Cycling Life for Wearable Electronics

1D Supercapacitors for Emerging Electronics: Current Status and Future Directions

Graphene‐Based Fibers: Recent Advances in Preparation and Application

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Nano‐RuO2‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density

Cited by 122 publications

References 92 publications

Flexible Zinc‐Ion Hybrid Fiber Capacitors with Ultrahigh Energy Density and Long Cycling Life for Wearable Electronics

Flexible Zinc‐Ion Hybrid Fiber Capacitors with Ultrahigh Energy Density and Long Cycling Life for Wearable Electronics

1D Supercapacitors for Emerging Electronics: Current Status and Future Directions

Graphene‐Based Fibers: Recent Advances in Preparation and Application

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Product

Resources

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Nano‐RuO₂‐Decorated Holey Graphene Composite Fibers for Micro‐Supercapacitors with Ultrahigh Energy Density