Iron oxide encapsulated in nitrogen-doped carbon as high energy anode material for asymmetric supercapacitors

Zhou, Jinhua; Xu, Shuchi; Ni, Lu; Chen, Ning-Na; Li, Xiaoge; Lu, Chunliang; Wang, Xizhang; Peng, Luming; Guo, Xuefeng; Ding, Weiping; Hou, Wenhua

doi:10.1016/j.jpowsour.2019.227047

Cited by 28 publications

(12 citation statements)

References 36 publications

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“…The intercept of the profiles at the Z′ axis represents the equivalent series resistance (ESR), which is composed of the contact (electrode/current collector interface), ionic (electrolyte), and intrinsic (PCs) resistances. 38 The ESR values of AC, AC-Fe-5%, AC-Fe-10%, AC-Fe-20%, and PC-Fe-10% were 1.43, 1.19, 1.10, 1.37, and 1.10 Ω, respectively. The ESR values were close and the minor change may from the intrinsic resistance.…”

Section: Resultsmentioning

confidence: 91%

“…The vertical line in all curves demonstrated the dominance of capacitive behavior, which was also proved by CV and GCD analyses. The intercept of the profiles at the Z ′ axis represents the equivalent series resistance (ESR), which is composed of the contact (electrode/current collector interface), ionic (electrolyte), and intrinsic (PCs) resistances . The ESR values of AC, AC-Fe-5%, AC-Fe-10%, AC-Fe-20%, and PC-Fe-10% were 1.43, 1.19, 1.10, 1.37, and 1.10 Ω, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Green Synthesis of Fe-Decorated Carbon Sphere/Nanosheet Derived from Bamboo for High-Performance Supercapacitor Application

Zhang

et al. 2020

Energy Fuels

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Designing low-cost and sustainable electrode materials for energy storage devices with large energy density and capacitance is still a formidable challenge. Herein, a green, template-free, and facile Fe-decorated porous carbon synthesis strategy derived from bamboo was proposed. This strategy includes hydrothermal carbonization pretreatment, which can tune the carbon morphology and dope iron elements in one step, and a mild KHCO3 activation to improve porosity while retaining the spherical morphology. The optimized Fe-decorated porous carbon exhibited a high surface area (1509.5 m2 g–1) with a carbon sphere/nanosheet architecture, which is beneficial for ion/electrolyte diffusion and increasing the accessibility between the surface area and electrolyte ions. Moreover, the introduced Fe oxides can provide extra pseudocapacitance, which comes from the reversible faradaic reaction between Fe3+ and Fe2+. The resulting carbon material presented a high capacitance of 467 F g–1 at 0.5 A g–1. The assembled KOH-based symmetric supercapacitor displayed a superb cycling performance that can output 99.8% of the initial capacitance after 5000 cycles, and the Na2SO4-based device showed the maximum energy density of 20.31 W h kg–1. Meanwhile, different behaviors in different electrolytes were further analyzed. This work demonstrated that the modification of hydrochar is an effective way to convert biomass into high-performance electrode materials, which has potential for advanced storage device applications.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Green Synthesis of Fe-Decorated Carbon Sphere/Nanosheet Derived from Bamboo for High-Performance Supercapacitor Application

Zhang

et al. 2020

Energy Fuels

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“…In summary, we have developed a facile and one-pot hydrothermal method to prepare a Ni-Zn-Fe LDH-GA nanocomposite as an advanced two-in-one active material for both the negative and positive electrodes. In the LDH-GA nanocomposite, the LDH particles were in situ grown and evenly distributed on the GA (1) GF-CNT@Fe 2 O 3 // GF-CoMoO 4 , [33] (2) MoFe 2 S 4Àz Se z //Mn x Mo 1Àx S 2Ày Se y , [34] (3) Fe 3 O 4 NSs@ERGO//NiMnO 3 , [35] (4) Fe-NCO-M@N//AC, [36] (5) N,S-rGO/WSe 2 / NiFe-LDH//N,S-rGO/WSe 2 /NiFe-LDH, [37] (6) ZnFe 2 O 4 //Ni(OH) 2 , [38] (7) FeOOH//MnO 2 , [39] (8) NiNTAs@Fe 2 O 3 //NiNTAs@MnO 2 , [40] (9) Co 3 O 4 / Fe 2 O 3 //Co 3 O 4 /Fe 2 O 3 , [41] (10) Fe 3 O 4 @NC//CoMn-LDH, [42] (11) FC@FeCo/NHCS//FC@FeCo/NHCS, [43] and (12) FCL//FCL. [44] The practical applicability of the LDH-GA//LDH-GA device to c) drive a rotor and d) turn on 44 green LEDs.…”

Section: Discussionmentioning

confidence: 99%

“…a) Long-term cycling stability of the device over 10 000 GCD cycles at 5.0 A g À1 . b) Ragone plot of the device in comparison with the other reported devices:(1) GF-CNT@Fe 2 O 3 // GF-CoMoO 4 ,[33] (2) MoFe 2 S 4Àz Se z //Mn x Mo 1Àx S 2Ày Se y ,[34] (3) Fe 3 O 4 NSs@ERGO//NiMnO 3 ,[35] (4) Fe-NCO-M@N//AC,[36] (5) N,S-rGO/WSe 2 / NiFe-LDH//N,S-rGO/WSe 2 /NiFe-LDH,[37] (6) ZnFe 2 O 4 //Ni(OH) 2 ,[38] (7) FeOOH//MnO 2 ,[39] (8) NiNTAs@Fe 2 O 3 //NiNTAs@MnO 2 ,[40] (9) Co 3 O 4 / Fe 2 O 3 //Co 3 O 4 /Fe 2 O 3 ,[41] (10) Fe 3 O 4 @NC//CoMn-LDH,[42] (11) FC@FeCo/NHCS//FC@FeCo/NHCS,[43] and (12) FCL//FCL [44]. The practical applicability of the LDH-GA//LDH-GA device to c) drive a rotor and d) turn on 44 green LEDs.…”

mentioning

confidence: 99%

In Situ Growth of Ni–Zn–Fe Layered Double Hydroxide on Graphene Aerogel: An Advanced Two‐in‐One Material for Both the Anode and Cathode of Supercapacitors

et al. 2021

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The push toward high‐performance supercapacitors calls for the development of efficient pseudocapacitive negative electrode materials that can better match the high capacitance of the typical positive electrodes. Herein, a facile and one‐pot hydrothermal approach for the in situ growth of the nickel–zinc–iron layered double hydroxide (LDH) onto the graphene aerogel (GA) substrate is introduced. Proper selection of the metal precursors with prominent pseudocapacitive behavior over a wide potential range coupled with the excellent double‐layer capacitive and charge transport properties of the GA network results in an LDH–GA nanocomposite that displays outstanding supercapacitive performances as both negative (387 F g−1, 101 mA h g−1, at 1.0 A g−1) and positive (1235 F g−1, 103 mA h g−1) electrodes. An aqueous LDH–GA//LDH–GA device with a wide voltage window (1.55 V) that demonstrates a significantly enhanced specific capacitance (304 F g−1 at 1.0 A g−1), outstanding specific energy (95 W h kg−1), appreciable specific power (81 kW kg−1), along with 88% retention of the initial capacitance after 10 000 cycles, is also fabricated. The superior supercapacitive performance of the Ni–Zn–Fe LDH–GA nanocomposite over both negative and positive voltage ranges opens a promising pathway toward manufacturing high‐energy supercapacitors for state‐of‐the‐art applications.

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“…The detailed synthesis process was described in our previous report [37]. First, the uniform FeOOH colloid aqueous solution was obtained by mixing 10 mL of 1 mol L GO layers were intrinsically intercalated by molecules such as sulfuric acid and water during the synthesis process.…”

Section: Preparation Of the Fe 3 O 4 @Nc Negative Electrodementioning

confidence: 99%

Iron oxide encapsulated in nitrogen-rich carbon enabling high-performance lithium-ion capacitor

Zhou

Kang

et al. 2020

Sci. China Mater.

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Lithium-ion capacitors (LICs) could combine the virtues of high power capability of conventional supercapacitors and high energy density of lithium-ion batteries. However, the lack of high-performance electrode materials and the kinetic imbalance between the positive and negative electrodes are the major challenge. In this study, Fe 3 O 4 nanoparticles encapsulated in nitrogen-rich carbon (Fe 3 O 4 @NC) were prepared through a self-assembly of the colloidal FeOOH with polyaniline (PANI) followed by pyrolysis. Due to the well-designed nanostructure, conductive nitrogen-rich carbon shells, abundant micropores and high specific surface area, Fe 3 O 4 @NC-700 delivers a high capacity, high rate capability and long cycling stability. Kinetic analyses of the redox reactions reveal the pseudocapacitive mechanism and the feasibility as negative material in LIC devices. A novel LIC was constructed with Fe 3 O 4 @NC-700 as the negative electrode and expanded graphene (EGN) as the positive electrode. The wellmatched two electrodes effectively alleviate the kinetic imbalance between the positive and negative electrodes. As a result, Fe 3 O 4 @NC-700//EGN LIC exhibits a wide operating voltage window, and thus achieves an ultrahigh energy density of 137.5 W h kg −1. These results provide fundamental insights into the design of pseudocapacitive electrode and show future research directions towards the next generation energy storage devices.

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Iron oxide encapsulated in nitrogen-doped carbon as high energy anode material for asymmetric supercapacitors

Cited by 28 publications

References 36 publications

Green Synthesis of Fe-Decorated Carbon Sphere/Nanosheet Derived from Bamboo for High-Performance Supercapacitor Application

Green Synthesis of Fe-Decorated Carbon Sphere/Nanosheet Derived from Bamboo for High-Performance Supercapacitor Application

In Situ Growth of Ni–Zn–Fe Layered Double Hydroxide on Graphene Aerogel: An Advanced Two‐in‐One Material for Both the Anode and Cathode of Supercapacitors

Iron oxide encapsulated in nitrogen-rich carbon enabling high-performance lithium-ion capacitor

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