Fe-doped Co3O4@C nanoparticles derived from layered double hydroxide used as efficient electrocatalyst for oxygen evolution reaction

He, Caiyun; Han, Xuzhao; Kong, Xianggui; Jiang, Meihong; Lei, Deqiang; Lei, Xiaodong

doi:10.1016/j.jechem.2018.06.014

Cited by 51 publications

(11 citation statements)

References 44 publications

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“…It is speculated that the introduction of Fe into the CoF 2 would increase the interlayer spacing of the CoF 2 and form vacancies in the lattice due to the electron transfer between Fe and Co elements, which would benefit the ion diffusion and electron transport during OER, and hence, improve the electrocatalytic performance. [ 47,48 ] Table S1 in the Supporting Information summarizes some recently reported literature with Co‐ and Ni‐ based catalysts, further indicating the advantageous electrocatalytic performance of Fe‐doped CoF 2 .…”

Section: Resultsmentioning

confidence: 86%

Atomic Doping and Anion Reconstructed CoF₂ Electrocatalyst for Oxygen Evolution Reaction

Dong

et al. 2020

Adv Materials Inter

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limits the availability of new types of energy. [4] Accordingly, hydrogen has been considered as a promising energy carrier to storage renewable energy through electrocatalytic water splitting. Great progress has been achieved to improve the electrolytic efficiency of the hydrogen evolution reaction (HER) [5,6] and oxygen evolution reaction (OER). [7,8] For HER, many nonnoble metal compounds have replaced traditional noble metal catalysts and have been utilized with satisfying catalytic efficiency. [9][10][11][12] Concerning to the fourelectron OER process, its reaction rates determine the overall catalytic efficiency of the water electrolysis. [13][14][15] Therefore, it is of particular importance to develop OER catalysts with high activity and durability.At present, noble metal-based materials for OER, such as ruthenium oxides, are still ranking the highest level. [16,17] Meanwhile, nonnoble metal compounds, for instance, transition metal oxides, [18][19][20][21] perovskite, [22,23] hydroxide, [24,25] nitrides, [26,27] borates, [28,29] and so on, have also captured extensive interests for preparing high-efficient OER catalysts. Among them, the metal fluoride, mostly literature reported for supercapacitor, lithium ion battery, etc., [30][31][32][33] is rarely wielded in the field of water electrolysis, possibly due to the chemical/electrochemical instability of fluoride ions and the weak bond between the metal ions and fluoride ions. Actually, fluoride ions can be easily replaced by other anions during the testing process, which is beneficial to optimize the catalytic activity by anionic reconstruction. [34] Consequently, metal fluoride is one of the most promising candidates to enhance the OER activity. Cobalt-based compounds, high-efficient catalytic activity for OER, have been considered one of the most prospective nonnoble catalysts in alkaline conditions for their low cost, rich source, and excellent corrosion resistance. [35][36][37][38][39] In addition, atomic doping or substitution can further improve its electrocatalytic performance by introducing more defects and catalytic active sites. [40][41][42] Herein, we took Fe-doped CoF 2 as research object to explore its electrocatalytic performance and catalytic mechanism in water splitting. Pristine CoF 2 was fabricated through a facile two-step reaction of hydrothermal method and chemical vapor deposition fluorination process. Furthermore, Fe 3+ was introduced into the resultant by adding iron agent into the precursor solution. The obtained Fe-doped CoF 2 revealed better electrocatalytic performance compared to pristine CoF 2 in 1 m Electrocatalytic water splitting is one of the most promising green solutions for large-scale hydrogen production, which has developed rapidly in recent years. The slow reaction rate of oxygen evolution reaction (OER) has become the bottleneck to improve the electrocatalytic efficiency. Herein, Fe-doped CoF 2 nanowire arrays on 3D nickel foam are prepared by two steps of hydrothermal reaction and fluorination process. The increa...

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Section: Resultsmentioning

confidence: 86%

Atomic Doping and Anion Reconstructed CoF₂ Electrocatalyst for Oxygen Evolution Reaction

Dong

et al. 2020

Adv Materials Inter

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“…In Figure b, two characteristic peaks associated with Fe 2p 1/2 and Fe 2p 3/2 were centered at 723.7 and 710.7 eV, respectively, and a separation of 13 eV proved the existence of Fe 3+ . One satellite peak (717.2 eV) located at 6.5 eV on the higher binding energy side of Fe 2p 3/2 was associated with Fe 2+ , and the other one (733.2 eV) with 9.5 eV higher than Fe 2p 1/2 was attributed to Fe 3+ . , The fitted subpeaks at 710.5 and 722.7 eV were characteristic of Fe 2+ , while other subpeaks at 712.5 and 725.3 eV were attributed to Fe 3+ . The Co 2p high-resolution XPS spectrum was composed of two main peaks at 794.9 and 779.6 eV (Figure c), which were corresponding to Co 2p 1/2 and Co 2p 3/2 , respectively. , A separation of 15.3 eV between Co 2p 3/2 and Co 2p 1/2 and two shake-up satellite peaks (“Sat.”) suggested the presence of Co 3+ and Co 2+ in the FeCo 2 O 4 material .…”

Section: Resultsmentioning

confidence: 92%

“…35 One satellite peak (717.2 eV) located at 6.5 eV on the higher binding energy side of Fe 2p 3/2 was associated with Fe 2+ , and the other one (733.2 eV) with 9.5 eV higher than Fe 2p 1/2 was attributed to Fe 3+ . 36,37 The fitted subpeaks at 710.5 and 722.7 eV were characteristic of Fe 2+ , while other subpeaks at 712.5 and 725.3 eV were attributed to Fe 3+ . 32 The Co 2p high-resolution XPS spectrum was composed of two main peaks at 794.9 and 779.6 eV (Figure 3c), which were corresponding to Co 2p 1/2 and Co 2p 3/2 , respectively.…”

Section: Resultsmentioning

confidence: 95%

Simple Preparation of Porous FeCo₂O₄ Microspheres and Nanosheets for Advanced Asymmetric Supercapacitors

Sun

et al. 2020

ACS Appl. Energy Mater.

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Transition metal oxides (TMOs) can serve as advanced electrode materials and have attracted extensive attention in the past decade. Herein, porous FeCo 2 O 4 microspheres (FeCo 2 O 4 MSs) and FeCo 2 O 4 nanosheets (FeCo 2 O 4 NSs) have been successfully synthesized in different solvent systems, accompanied by a corresponding annealing treatment of precursors. The FeCo 2 O 4MSs and NSs possessed a mesoporous structure, and the BET surface areas reached 40.9 and 38.5 m 2 g −1 , respectively. The electrochemical studies were performed in a KOH aqueous electrolyte, and such FeCo 2 O 4 MSs delivered 231.5 C g −1 at 1 A g −1 and exhibited a good long-term cycling performance during 5000 cycles with 71.3% capacity retention. In contrast, the FeCo 2 O 4 NSs delivered a higher capacity of 339.0 C g −1 at 1 A g −1 and exhibited a better rate capability with 73% capacity retention at 13 A g −1 . Furthermore, the assembled FeCo 2 O 4 NSs//AC ASC could preserve 100.5% specific capacity after 5000 cycles and exhibited a high energy density of 37.1 W h kg −1 at 928.0 W kg −1 , while the FeCo 2 O 4 MSs//AC ASC possessed a relatively low energy density with 26.2 W h kg −1 at 965.5 W kg −1 . The outstanding electrochemical behavior of FeCo 2 O 4 NSs and MSs makes them promising electrode materials in electrochemical storage devices. Additionally, this current synthetic strategy possesses some advantages such as simple handling, low maintenance cost, and environmental friendliness; thus, it can be employed for synthesizing other TMOs with superior electrochemical properties.

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“…PXRD pattern of Co 1.11 Te 2 was slightly shifted comparing to that of Fe-Co 1.11 Te 2 @NCNTF-x (2θ = 0.2°) at (101) facet, which could be ascribed to the partial replacement of Co 2 + ions by larger Fe 3 + ions in Co 1.11 Te 2 (Figure 1b). [46] The TEM images of Fe-Co 1.11 Te 2 @NCNTF-2 shown a hollow interior with tangled N-doped carbon nanotubes and the heterogeneous distributed Fe-Co 1.11 Te 2 particles ( Figure 2). The high-resolution TEM (HRTEM) image (Figure 2d) indicated an inter-planar spacing of 0.281 nm of the characteristic (101) plane of Co 1.11 Te 2 nanoparticles .…”

Section: Resultsmentioning

confidence: 99%

Metal‐Organic Framework‐Derived Fe‐Doped Co_1.11Te₂ Embedded in Nitrogen‐Doped Carbon Nanotube for Water Splitting

Wang

Xia

et al. 2020

ChemSusChem

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A rational design is reported of Fe-doped cobalt telluride nanoparticles encapsulated in nitrogen-doped carbon nanotube frameworks (Fe-Co 1.11 Te 2 @NCNTF) by tellurization of Fe-etched ZIF-67 under a mixed H 2 /Ar atmosphere. Fe-doping was able to effectively modulate the electronic structure of Co 1.11 Te 2 , increase the reaction activity, and further improve the electrochemical performance. The optimized electrocatalyst exhibited superior hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) performances in an alkaline electrolyte with low overpotentials of 107 and 297 mV with a current density of 10 mA cm À 2 , in contrast to the undoped Co 1.11 Te 2 @NCNTF (165 and 360 mV, respectively). The overall water splitting performance only required a voltage of 1.61 V to drive a current density of 10 mA cm À 2. Density function theory (DFT) calculations indicated that the Fe-doping not only afforded abundant exposed active sites but also decreased the hydrogen binding free energy. This work provided a feasible way to study non-precious-metal catalysts for an efficient overall water splitting.

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Fe-doped Co3O4@C nanoparticles derived from layered double hydroxide used as efficient electrocatalyst for oxygen evolution reaction

Cited by 51 publications

References 44 publications

Atomic Doping and Anion Reconstructed CoF₂ Electrocatalyst for Oxygen Evolution Reaction

Atomic Doping and Anion Reconstructed CoF₂ Electrocatalyst for Oxygen Evolution Reaction

Simple Preparation of Porous FeCo₂O₄ Microspheres and Nanosheets for Advanced Asymmetric Supercapacitors

Metal‐Organic Framework‐Derived Fe‐Doped Co_1.11Te₂ Embedded in Nitrogen‐Doped Carbon Nanotube for Water Splitting

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Fe-doped Co3O4@C nanoparticles derived from layered double hydroxide used as efficient electrocatalyst for oxygen evolution reaction

Cited by 51 publications

References 44 publications

Atomic Doping and Anion Reconstructed CoF2 Electrocatalyst for Oxygen Evolution Reaction

Atomic Doping and Anion Reconstructed CoF2 Electrocatalyst for Oxygen Evolution Reaction

Simple Preparation of Porous FeCo2O4 Microspheres and Nanosheets for Advanced Asymmetric Supercapacitors

Metal‐Organic Framework‐Derived Fe‐Doped Co1.11Te2 Embedded in Nitrogen‐Doped Carbon Nanotube for Water Splitting

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Atomic Doping and Anion Reconstructed CoF₂ Electrocatalyst for Oxygen Evolution Reaction

Atomic Doping and Anion Reconstructed CoF₂ Electrocatalyst for Oxygen Evolution Reaction

Simple Preparation of Porous FeCo₂O₄ Microspheres and Nanosheets for Advanced Asymmetric Supercapacitors

Metal‐Organic Framework‐Derived Fe‐Doped Co_1.11Te₂ Embedded in Nitrogen‐Doped Carbon Nanotube for Water Splitting