Ultrathin carbon-coated FeS<sub>2</sub> nanooctahedra for sodium storage with long cycling stability

Wang, Shiwen; Jing, Yaping; Han, Lifeng; Wang, Heng; Wu, Shao-Yi; Zhang, Yong; Wang, Lizhen; Zhang, Kai; Kang, Yong‐Mook; Cheng, Peng

doi:10.1039/c8qi01144c

Cited by 22 publications

(9 citation statements)

References 52 publications

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“…44 The peaks at around 164.6 and 168.5 eV are related to the sulfates. 32 As shown in Figure 3a, the prepared ZIF-67 NPs have the rhombic dodecahedral morphology with a particle size of approximately 500 nm. Figure 3b,c shows the carbonized ZIF-67 and as-prepared Co@DNC, respectively, both of which still retain the rhombic dodecahedral morphology of ZIF-67.…”

Section: Resultsmentioning

confidence: 91%

“…As shown in Figure 1d, the diffraction peaks at around 28.5°, 33.0°, 37.0°, 40.7°, 47.3°, 56.2°, 58.9°, 61.6°, 64.1°, 76.4°, and 78.8°correspond to the (111), ( 200), ( 210), ( 211), ( 220), ( 311), ( 222), ( 023), ( 321), (331), and (420) facets of FeS 2 (JCPDS 42-1340), respectively. 16,32 The diffraction peaks at around 44.2°, 51.5°, and 75.9°correspond to the (111), (200), and (220) facets of Co 0 (JCPDS 15-0806), 28 respectively. Besides, the peak at around 25.8°c orresponds to graphite.…”

Section: Resultsmentioning

confidence: 99%

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ZIF-67-Derived Dodecahedral Co@N-Doped Graphitized Carbon Protected by a Porous FeS₂Thin-Layer as an Efficient Catalyst to Promote the Oxygen Reduction Reaction

Zhang

et al. 2020

ACS Sustainable Chem. Eng.

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The oxygen reduction reaction (ORR) plays an irreplaceable role in many energy-conversion processes. Low-cost catalysts with high activity and stability are eagerly needed to improve the sluggish ORR kinetics. Herein, we use a simple hydrothermal method to evenly deposit iron disulfide (FeS2, as shell) on the surface of dodecahedral Co@N-doped graphitized carbon (Co@DNC, as core) with ZIF-67 dodecahedrons as the precursor. Co@DNC@FeS2-0.5 (Co@DNC-to-FeCl3·6H2O mass ratio of 0.5) catalyst shows a comparable ORR catalytic activity (onset potential of 0.942 V and half-wave potential of 0.846 V, vs reversible hydrogen electrode) to commercial Pt/C (20 wt %) in alkaline media. The charge transfer resistance (4.06 Ω) of Co@DNC@FeS2-0.5 is smaller than that of Pt/C (6.72 Ω), indicating that Co@DNC@FeS2-0.5 facilitates a fast Faradaic process and charge transfer kinetics for the ORR. The core@shell structure and highly active moieties of Co@DNC@FeS2-0.5 contribute to the high ORR activity. DNC-wrapped Co/CoO (originated from the oxidation of surface Co0) possesses the positive charges to prioritize the adsorption of O2 on the Co–N x (Co atom binds to pyridinic N) active sites, and then, the S–S bonds in FeS2 with multivalent redox activity can supply/transfer the electrons to Co–N x to boost the ORR via a 4e– pathway. Moreover, the DNC@FeS2 shell with a porous structure can protect the active sites on the Co cores and accelerate the mass transfer of ORR-related species (O2, OH–, etc.) to the active sites. This study provides a novel strategy to enhance ORR activity using the core@shell structured catalysts originating from zeolite imidazole frameworks.

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Section: Resultsmentioning

confidence: 91%

Section: Resultsmentioning

confidence: 99%

ZIF-67-Derived Dodecahedral Co@N-Doped Graphitized Carbon Protected by a Porous FeS₂Thin-Layer as an Efficient Catalyst to Promote the Oxygen Reduction Reaction

Zhang

et al. 2020

ACS Sustainable Chem. Eng.

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“…More specifically, when the current density reaches 10 and 20 A g −1 , the reversible capacity is 250 and 185 mAh g −1 , respectively, for FeCo 8 S 8 NS/rGO, while the values decreases to 229 and 130 mAh g −1 for FeCoS 2 NS/rGO and 242 and 162 mAh g −1 for Co 9 S 8 NS/rGO. A comparison of the rate capability of the FeCo 8 S 8 NS/rGO electrode with that of reported CoS-based 58−64 or FeS-based electrodes 65,66 is also listed in Figure 7c. Comparing to these advanced anode materials, the high rate capability enables FeCo 8 S 8 NS/rGO as a promising anode for sodium storage.…”

Section: Resultsmentioning

confidence: 99%

Phase Engineering of Iron–Cobalt Sulfides for Zn–Air and Na–Ion Batteries

Jiang

Yang

et al. 2020

ACS Nano

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Rechargeable batteries are promising platforms for sustainable development of energy conversion and storage technologies. Highly efficient multifunctional electrodes based on bimetallic sulfides for rechargeable batteries are extremely desirable but still challenging to tailor with controllable phase and structure. Here, we report a colloidal strategy to fabricate FeCo-based bimetallic sulfides on reduced graphene oxide (rGO), which are expected to display highly efficient oxygen electrocatalysis and sodium storage performances. Specifically, as-screened FeCo 8 S 8 nanosheets (NSs) on rGO originating from suitable tailoring of the Co 9 S 8 matrix with Fe at the atomic level exhibited a very low potential difference (0.77 V) at 10 mA cm −2 and negligible voltage loss after 200 cycles as an air electrode for Zn−air batteries. For Na−ion batteries, FeCo 8 S 8 NS/rGO demonstrated a superior high-rate capability (188 mAh g −1 at 20 A g −1 ) with long-term cycling stability. The bifunctional electrocatalytic property and sodium storage performance are attributed to not only the synergistic effect of Fe/Co but also the optimized catalytic activity and ion transport ability by the in situ rGO hybrid. This work demonstrates the potential applications of FeCo-based bimetallic sulfides as efficient electrode materials for both rechargeable Zn−air and Na−ion batteries.

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“…Hybridizing nanostructures of MSs with carbon materials is a common and effective approach to improve electrochemical performance of MSs as SIBs anodes. [29] Various carbon materials including commonly used reduced graphene oxide, [30] carbon nanotubes, [31] and graphene [32] as well as amorphous carbon, [33] functional graphene nanosheets (FGNs), [34] multiwall carbon nanotubes (MWCNTs), [35] disordered carbon, [36] carbon microtubes [37] were employed towards composites formation with improved electrochemical performance of MSs. NiS 2 nanoparticles anchored on graphene nanosheets (GNS) has much improved rate performance than pure NiS 2 , which only retains capacity of 9 mAh g −1 at 1614 mA g −1 as compared to 168 mAh g −1 of NiS 2 -GNS.…”

Section: Sibsmentioning

confidence: 99%

The Advances of Metal Sulfides and In Situ Characterization Methods beyond Li Ion Batteries: Sodium, Potassium, and Aluminum Ion Batteries

2019

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Lithium ion batteries (LIBs) have embraced successes in industrial commercialization and garnered the spotlights in academic research for energy storage devices in the last few decades, owing to the high energy density and high voltage output. [1] Following the widespread application of LIBs, the price of Li resource (mostly Li carbonates) has been increasing significantly, which has already tripled since the beginning of 21st century due to the limited reserve and uneven distribution. [2] Estimated mass fraction of Li on earth crust is only ≈20 ppm, [2d] while the identified Li reserves are geographically unevenly distributed, almost 2/3 of world's Li reserves are located in the "lithium triangle" area at South America. [2a,b] Apart from Li, there have been predictions of supply risks for cobalt resources as well, which are also geographically concentrated in certain regions. [2a,f,3] It is forecasted that Li with medium-to-long term supply risks will be consumed by year of 2050 while the short term Co supply risk is even more urgent than Li. [2a] The Li and Co supply risks on LIBs have triggered and necessitated the exploitation and development of alternative energy storage devices, for example sodium ion batteries (SIBs), potassium ion batteries (PIBs), and aluminum ion batteries (AIBs). The larger ionic radii (Na + : 1.02 Å and K + : 1.38 Å) than Li + (0.76 Å), together with the higher molecular weight of Na (23) and K (39.1) as displayed in Figure 1a, will inevitably hinder the redox kinetics and storage capability of SIBs/PIBs. In addition, the standard redox potential of sodium/potassium (−2.74 V for Na/Na + and −2.96 V for K/K + as shown in Figure 1b) are higher than Li (−3.04 V for Li/Li +), limiting the energy density. [2d,4] Thus the theoretical gravimetric/volumetric capacity of Na (1166 mAh g −1 ; 1131 mAh cm −3) and K (685 mAh g −1 ; 609 mAh cm −3) are both inferior to that of Li (3861 mAh g −1 ; 2062 mAh cm −3) as presented in Figure 1c. [2d] However, Na and K have much higher crustal abundance of 2.36 and 2.09 wt% respectively, in sharp contrast with Li (0.0017 wt%). [5] The cost of Na and K are much lower than that of Li as shown in Figure 1d, making SIBs/PIBs cost effective alkaline metal ion batteries. [5] Furthermore, the lower desolvation energy of Na + /K + (152.8/114.6 kJ mol −1) in ethylene carbonate (EC) than Li + (208.9 kJ mol −1) and higher With increasing cost and supply risks of lithium-ion batteries (LIBs), exploitation of alternative metal-ion batteries has been ongoing in recent years. Sodium-ion batteries (SIBs), potassium-ion batteries (PIBs), and aluminum-ion batteries (AIBs) have unique advantages as post-LIB alternatives. Nonetheless, development of electrode materials with high capacity, good reversibility, and extended cycling stability remains challenging. Metal sulfides (MSs), with improved electronic conductivity and better reversibility than metal oxide counterparts, as well as high theoretical capacities, are deemed as promising electrode materials and have been investi...

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Ultrathin carbon-coated FeS₂ nanooctahedra for sodium storage with long cycling stability

Abstract: Porous ultrathin carbon-encapsulated FeS2@C nanooctahedra synthesized by a facile solvothermal and carbon-coating-annealing-pickling strategy exhibit a superior performance for sodium-ion storage.

Cited by 22 publications

References 52 publications

ZIF-67-Derived Dodecahedral Co@N-Doped Graphitized Carbon Protected by a Porous FeS₂Thin-Layer as an Efficient Catalyst to Promote the Oxygen Reduction Reaction

ZIF-67-Derived Dodecahedral Co@N-Doped Graphitized Carbon Protected by a Porous FeS₂Thin-Layer as an Efficient Catalyst to Promote the Oxygen Reduction Reaction

Phase Engineering of Iron–Cobalt Sulfides for Zn–Air and Na–Ion Batteries

The Advances of Metal Sulfides and In Situ Characterization Methods beyond Li Ion Batteries: Sodium, Potassium, and Aluminum Ion Batteries

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Ultrathin carbon-coated FeS2 nanooctahedra for sodium storage with long cycling stability

Abstract: Porous ultrathin carbon-encapsulated FeS2@C nanooctahedra synthesized by a facile solvothermal and carbon-coating-annealing-pickling strategy exhibit a superior performance for sodium-ion storage.

Cited by 22 publications

References 52 publications

ZIF-67-Derived Dodecahedral Co@N-Doped Graphitized Carbon Protected by a Porous FeS2Thin-Layer as an Efficient Catalyst to Promote the Oxygen Reduction Reaction

ZIF-67-Derived Dodecahedral Co@N-Doped Graphitized Carbon Protected by a Porous FeS2Thin-Layer as an Efficient Catalyst to Promote the Oxygen Reduction Reaction

Phase Engineering of Iron–Cobalt Sulfides for Zn–Air and Na–Ion Batteries

The Advances of Metal Sulfides and In Situ Characterization Methods beyond Li Ion Batteries: Sodium, Potassium, and Aluminum Ion Batteries

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Ultrathin carbon-coated FeS₂ nanooctahedra for sodium storage with long cycling stability

ZIF-67-Derived Dodecahedral Co@N-Doped Graphitized Carbon Protected by a Porous FeS₂Thin-Layer as an Efficient Catalyst to Promote the Oxygen Reduction Reaction

ZIF-67-Derived Dodecahedral Co@N-Doped Graphitized Carbon Protected by a Porous FeS₂Thin-Layer as an Efficient Catalyst to Promote the Oxygen Reduction Reaction