Preparation and electrochemical properties of mesoporous α-Fe2O3 nanowires for supercapacitor application

Wu, Heng; Li, Yuan; Xiao, Wei; Tian, Liangliang; Song, Jing

doi:10.1007/s10854-023-10456-0

Cited by 4 publications

(4 citation statements)

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“…It is believed that the well-developed porosity mainly originates from the growth, accumulation, and agglomeration of numerous Fe2O3 nanoparticles to form hollow-structured porous Fe2O3 nanorods. The estimated specific surface area of the α-Fe2O3 HR/RGO-30 composite is 168.6 m 2 g −1 , which remarkably exceeds that of Fe2O3-based compounds and composites reported previously, including α-Fe2O3 nanowires (70.6 m 2 g −1 ) [21], α-Fe2O3@Ag microboxes (128 m 2 g −1 ) [29], V2O5-doped α-Fe2O3 nanotubes (95.9 m 2 g −1 ) [43], α-Fe2O3 nanoplates/the RGO composite (38.04 m 2 g −1 ) [44] and the Fe2O3 nanoparticles/MXene composite (14.5 m 2 g −1 ) [45]. The ample porous architecture, superior surface area, and unique morphology can endow the α-Fe2O3 HR/RGO-30 composite with abundant active sites for electrochemical redox reactions and, meanwhile, might be in favor of the impregnation and diffusion of electrolyte ions through pore channels and voids [11,21,44].…”

Section: Materials Characterizationscontrasting

confidence: 61%

“…The estimated specific surface area of the α-Fe2O3 HR/RGO-30 composite is 168.6 m 2 g −1 , which remarkably exceeds that of Fe2O3-based compounds and composites reported previously, including α-Fe2O3 nanowires (70.6 m 2 g −1 ) [21], α-Fe2O3@Ag microboxes (128 m 2 g −1 ) [29], V2O5-doped α-Fe2O3 nanotubes (95.9 m 2 g −1 ) [43], α-Fe2O3 nanoplates/the RGO composite (38.04 m 2 g −1 ) [44] and the Fe2O3 nanoparticles/MXene composite (14.5 m 2 g −1 ) [45]. The ample porous architecture, superior surface area, and unique morphology can endow the α-Fe2O3 HR/RGO-30 composite with abundant active sites for electrochemical redox reactions and, meanwhile, might be in favor of the impregnation and diffusion of electrolyte ions through pore channels and voids [11,21,44]. As a consequence, efficient contact between the electrode and electrolyte, with the easy and fast access of ions, is expected to realize the significant enhancement of the charge storage ability of the α-Fe2O3 HR/RGO-30 composite.…”

Section: Materials Characterizationscontrasting

confidence: 61%

“…One is to construct nanostructures with unique morphologies and abundant porosities. For example, nanosized Fe 2 O 3 particles [ 17 , 18 ], needles [ 19 ], rods [ 16 ] and shuttles [ 20 ], porous Fe 2 O 3 nanowires [ 21 ] and nanosheets [ 22 ], and cube-like and sea urchin-shaped Fe 2 O 3 superstructures [ 23 , 24 ] were successively developed for supercapacitor electrodes. The other is to couple Fe 2 O 3 with various conductive species (e.g., graphene [ 11 ], carbon nanotube [ 25 ], metal nanoparticles [ 26 ], MXene [ 27 ], etc.)…”

Section: Introductionmentioning

confidence: 99%

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Porous α-Fe2O3 Hollow Rods/Reduced Graphene Oxide Composites Templated by MoO3 Nanobelts for High-Performance Supercapacitor Applications

Zhou,

Liang,

Xiao

et al. 2024

Molecules

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Porous α-Fe2O3 hollow rods/reduced graphene oxide (α-Fe2O3 HR/RGO) composites with unique morphological characteristics and a high surface area are prepared through a template strategy, which was systematically studied and found to have outstanding supercapacitive properties. When served as active material in a three-electrode setup, the optimized α-Fe2O3 HR/RGO-30, comprised 76.5 wt% α-Fe2O3 and 23.2 wt% RGO, was able to offer the largest specific capacitance of 426.3 F g−1, an excellent rate capability as well as satisfactory cycle life with capacitance retention of 87.7% and Coulombic efficiency of 98.9% after continuously charging/discharging at 10 A g−1 for beyond 10,000 cycles. Such electrochemical behaviors of the α-Fe2O3 HR/RGO-30 electrode can rival or even surpass those of many Fe2O3-based electrodes documented in the previous literature. Later, a symmetric supercapacitor cell of α-Fe2O3 HR/RGO-30//α-Fe2O3 HR/RGO-30 was fabricated. The assembled device offers the maximum energy density of 18.7 Wh kg−1, and also exhibits commendable rate capability, and features stable cycling durability (with capacitance retention of 83.2% together with a Coulombic efficiency of 99.3% after 10,000-cycle charge/discharge at 5 A g−1). These notable electrochemical performances enable the α-Fe2O3 HR/RGO-30 composite to be a high-potential material for advanced energy storage systems.

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Section: Materials Characterizationscontrasting

confidence: 61%

Section: Materials Characterizationscontrasting

confidence: 61%

Section: Introductionmentioning

confidence: 99%

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Porous α-Fe2O3 Hollow Rods/Reduced Graphene Oxide Composites Templated by MoO3 Nanobelts for High-Performance Supercapacitor Applications

Zhou,

Liang,

Xiao

et al. 2024

Molecules

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“…Ferrous oxalate (FeC 2 O 4 ·2H 2 O) is a widely used chemical raw material for the synthesis of nanometer materials, porous materials for supercapacitors, and lithium iron phosphate cathode materials for lithium-ion batteries . In industrial production, liquid-phase precipitation is the favored method for synthesizing ferrous oxalate because of the simple production process .…”

Section: Introductionmentioning

confidence: 99%

Recovery of Iron Resources from Wet-Process Phosphoric Acid and the Preparation of High Purity Ferrous Oxalate: Solvent Extraction and Photochemical Reaction

Hu,

Deng,

Jin

et al. 2024

ACS Sustainable Chem. Eng.

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Oxalic acid was used as a stripping agent to recover the associated metal resource Fe from wet-process phosphoric acid by solvent extraction, and ferrous oxalate was prepared by the photochemical reaction of Fe(III)−oxalate complexes. This paper focuses on the stripping of Fe(III), the preparation of FeC 2 O 4 • 2H 2 O, and the macroscopic kinetics of the photochemical reaction of Fe(III)(C 2 O 4 ) 3 3− . The stripping rate of Fe(III) reached 83.01% using oxalic acid. pH was decisive for the transformation of Fe(II)(C 2 O 4 ) 2 2− into FeC 2 O 4 •2H 2 O. Ferrous oxalate began to precipitate when pH < 3.13 and almost all iron precipitated when pH < 1.5. The high O 2 content in the atmospheric gas of the photochemical reaction significantly decreased the yield of FeC 2 O 4 •2H 2 O. FeC 2 O 4 •2H 2 O had different morphologies and crystal structures at different temperatures. The total impurity content of the ferrous oxalate was less than 120 ppm, and the quality met the battery-grade standard. The photochemical reaction rate was proportional to the ultraviolet intensity, independent of the Fe(III) concentration, oxalate ligand concentration, and reaction temperature. On the basis of the macroscopic kinetic results, the photochemical reaction mechanism and kinetic equation of Fe(III)(C 2 O 4 ) 33− in the system were obtained. The transformation of substances during the photochemical reaction was analyzed by liquid in situ infrared spectrometry. This study confirmed the feasibility of using oxalic acid to recover iron from wet-processed phosphoric acid and prepare high purity ferrous oxalate, realizing high-value utilization of iron resources.

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A Minireview of Multimetallic Iron‐Based Oxides for Supercapacitive Negative Electrode Materials

Zhong,

Zhang

2024

Eur J Inorg Chem

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The serious mismatch between the positive and negative electrodes of supercapacitors (SCs) makes it imperative to develop high‐performance negative electrode materials. Among them, multimetallic iron‐based oxides (MIBOs) are intensively investigated attributed to their high theoretical specific capacitance, wide operating potential window, copious electrochemical active sites, variable metal oxidation states, and abundant redox centers. This paper briefly introduces some essential information on SCs and the most common synthesis methods of MIBOs. Also, the research progress of several important MIBOs and their composites is discussed. Finally, the existing problems and challenges of MIBOs are summarized and future outlooks are likewise proposed.

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Preparation and electrochemical properties of mesoporous α-Fe2O3 nanowires for supercapacitor application

Cited by 4 publications

References 54 publications

Porous α-Fe2O3 Hollow Rods/Reduced Graphene Oxide Composites Templated by MoO3 Nanobelts for High-Performance Supercapacitor Applications

Porous α-Fe2O3 Hollow Rods/Reduced Graphene Oxide Composites Templated by MoO3 Nanobelts for High-Performance Supercapacitor Applications

Recovery of Iron Resources from Wet-Process Phosphoric Acid and the Preparation of High Purity Ferrous Oxalate: Solvent Extraction and Photochemical Reaction

A Minireview of Multimetallic Iron‐Based Oxides for Supercapacitive Negative Electrode Materials

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