Investigation of hematite nanorod–nanoflake morphological transformation and the application of ultrathin nanoflakes for electrochemical devices

Liu, Tianyu; Ling, Yichuan; Yang, Yi; Finn, Lauren; Collazo, Edgar; Zhai, Teng; Tong, Yexiang; Li, Yat

doi:10.1016/j.nanoen.2014.12.023

Cited by 86 publications

(57 citation statements)

References 39 publications

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“…All the CV curves of the three sample electrodes are fairly rectangular shape without any redox peaks, which indicate excellent double‐layer capacitive (EDLC) behaviors. Obviously, the magnitude of specific capacitance is positively related to the integral area of the CV curves at the same scanning rate . Therefore, the sample electrode of HPC‐2 displays the highest specific capacitance among the three samples.…”

Section: Resultsmentioning

confidence: 94%

Hierarchically Porous Carbon as a High‐Rate and Long‐Life Electrode Material for High‐Performance Supercapacitors

Guo

Zhang

et al. 2018

ChemElectroChem

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In this study, cost‐effective hierarchically porous carbon (HPC) derived from starch was successfully prepared through a simple mixing and subsequent one‐step carbonization method. Based on the three‐dimensional interconnected hierarchically porous structure, HPC exhibits a high specific surface area of 2259.54 m2 g−1 and a specific capacitance of 385.7 F g−1 at 1 A g−1 in a three‐electrode system. When the as‐prepared carbon was employed to fabricate an aqueous symmetrical supercapacitor, the device displayed a high specific capacitance of 81.3 F g−1 at 1 A g−1, and even at 20 A g−1 the specific capacitance remained 64 F g−1 (capacity retention rate of 78.72 % compares with that at 1 A g−1), demonstrating an outstanding rate performance. This supercapacitor maintained a capacity retention of 100 % after 60 000 cycles at a current density of 5 A g−1, indicating superior long‐term cycling stability. Furthermore, when the as‐prepared carbon was employed to fabricate a symmetrical supercapacitor in ionic liquid (1‐ethyl‐3‐methylimidazolium tetrafluoroborate, EMIMBF4) electrolyte, it ultimately achieved an ultrahigh energy density of 133.94 Wh kg−1 (power density of 1997.51 W kg−1) and a capacity retention rate of 83.3 % was maintained after 5000 cycles throughout a wide operating potential window of 0–4 V at 10 A g−1.

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Section: Resultsmentioning

confidence: 94%

Hierarchically Porous Carbon as a High‐Rate and Long‐Life Electrode Material for High‐Performance Supercapacitors

Guo

Zhang

et al. 2018

ChemElectroChem

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“…[42,43,45,46,72,73] There are a variety of methods to synthesize Fe 2 O 3 , such as sol-gel, [74,75] chemical vapor deposition, [76] electrodeposition, [77] electrospun, [78][79][80] spray pyrolysis [81] and hydrothermal method. [42,43,45,46,72,73] There are a variety of methods to synthesize Fe 2 O 3 , such as sol-gel, [74,75] chemical vapor deposition, [76] electrodeposition, [77] electrospun, [78][79][80] spray pyrolysis [81] and hydrothermal method.…”

Section: Fe 2 O 3 -Based Nanostructured Materials For Scsmentioning

confidence: 99%

“…For example, Zhu et al reported hematite nanoparticles with narrow size distribution, which yielded a high capacitance of 340.5 Fg −1 at 1 A g −1 . [40,45,46] Recently, ultrathin α-Fe 2 O 3 nanoflakes (NFs) with enhanced electrochemical properties have been reported by Li and his co-workers. Additionally, a solid-state ASCs based on these Fe 2 O 3 NTs achieved a high energy density of 0.55 mW h cm −3 and good rate capability.…”

Section: Fe 2 O 3 -Based Nanostructured Materials For Scsmentioning

confidence: 99%

“…[72] Highly ordered Fe 2 O 3 NTs prepared by a sacrificial template-accelerated hydrolysis treatment presented a specific capacitance of 180.4 mF cm −2 (257.8 F g −1 ) at the current density of 1 A g −1 . [46] These ultrathin α-Fe 2 O 3 NFs were fabricated by an electrochemically induced morphological transformation method, as illustrated in Figure 4a. [44] In comparison to zero-dimensional (0D) and one-dimensional (1D) nanostructures, two-dimensional (2D) nanostructures such as nanosheets (NSs) are more beneficial for increasing the contact area with electrolyte and shortening ion diffusion paths, and hence usually exhibiting superior capacitive performance.…”

Section: Fe 2 O 3 -Based Nanostructured Materials For Scsmentioning

confidence: 99%

“…Similarly, a novel hierarchical composite architecture of Fe 2 O 3 nanoparticles, graphite foam and carbon nanotubes (GF-CNT@ Fe 2 O 3 ) with remarkable capacitive performance was developed by Guan et al [59] As illustrated in Figure 6a, GF-CNT with high electrical conductivity and surface area was first constructed via a CVD method, followed by coating with crystalline Fe 2 O 3 using atomic layer deposition (ALD) techniques. [46] Copyright 2015, Elsevier. Reproduced with permission.…”

Section: Figurementioning

confidence: 99%

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Iron‐Based Supercapacitor Electrodes: Advances and Challenges

Zeng

Meng

et al. 2016

Advanced Energy Materials

Self Cite

402

204

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Supercapacitors (SCs) have great promise as the state‐of‐the‐art power source in portable electronics and hybrid vehicles. The performance of SCs is largely determined by the properties of the electrode material, and numerous efforts have been devoted to the explorations of novel electrode materials. Recently, iron‐based materials, including Fe2O3, Fe3O4, FeOOH, FeOx, CoFe2O4, and MnFe2O4, have received considerable attention as very promising electrode materials for SCs due to their high theoretical specific capacitances, natural abundance, low cost, and non‐toxicity. However, most of these Fe‐based SC electrodes suffer from poor conductivity and/or electrochemical instability, which seriously impede their implementation as high‐performance electrodes for SCs. To settle these issues, substantial efforts have been made in improving their conductivity and cycling stability, and great processes have been achieved. Here, recent research advances in the rational design and synthesis of diverse Fe‐based nanostructured electrodes and their capacitive performance for SCs are presented. Besides, challenges and prospects of Fe‐based materials as advanced negative electrodes for SCs are also discussed.

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Hematite Materials for Solar‐Driven Photoelectrochemical Cells

Morelli

2018

Photoelectrochemical Solar Cells

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Investigation of hematite nanorod–nanoflake morphological transformation and the application of ultrathin nanoflakes for electrochemical devices

Cited by 86 publications

References 39 publications

Hierarchically Porous Carbon as a High‐Rate and Long‐Life Electrode Material for High‐Performance Supercapacitors

Hierarchically Porous Carbon as a High‐Rate and Long‐Life Electrode Material for High‐Performance Supercapacitors

Iron‐Based Supercapacitor Electrodes: Advances and Challenges

Hematite Materials for Solar‐Driven Photoelectrochemical Cells

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