FeS2/FeCoS2 nanoparticles/reduced graphene oxide interfacial composite structure as highly reactive counter electrodes in dye-sensitized solar cells

Gao, Yuan; Liao, Wei; Wang, Wen; Zuo, Xueqin; Yang, Qun; Tang, Huaibao; Jin, Shaowei; Li, Guang

doi:10.1007/s10854-020-05192-8

Cited by 9 publications

(8 citation statements)

References 38 publications

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“…Peaks are also attributed to the S 2p 3/2 at 163.0 eV and the S 2p 1/2 at 163.8 eV. The peak at 169.0 eV is attributed to the SO 4 2– group formed by exposure to air oxidation. , At the same time, XPS spectra of FeS 2 are shown in Figure . FeS 2 was synthesized under the same method as Fe 0.8 Ni 0.2 S 2 , in which the concentration of Fe(NO 3 ) 3 ·9H 2 O was 10 mmol without Ni(NO 3 ) 2 ·6H 2 O.…”

Section: Resultsmentioning

confidence: 82%

“…The peak at 169.0 eV is attributed to the SO 4 2− group formed by exposure to air oxidation. 39,40 At the same time, XPS spectra of FeS 2 are Compared with spectra of Fe 0.8 Ni 0.2 S 2 , no Ni was found in Figure 4a, and similar peaks were found for Fe 2p (Figure 4b) and S 2p (Figure 4d). On the basis of the peak area in Figure 4b,c, the molar ratios of Fe 2+ to Fe 3+ were calculated as 1.36 for Peroxidase-like activity of nanozymes was tested by using H 2 O 2 and TMB as substrates as shown in Figure 5A.…”

Section: ■ Introductionmentioning

confidence: 63%

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Improvement of Fe_0.8Ni_0.2S₂ Peroxidase-like Activity through the Accelerated Conversion from Fe³⁺ to Fe²⁺

Zhang

Nan

2022

J. Phys. Chem. C

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Nanoenzymes have been regarded as strong substitutes to natural enzymes in the last decades. However, high concentrations of substrates are always needed because of the low activity of nanozymes, which causes an increase of the cost and an increase in environmental pollution in practical applications. Thus, improved nanozymic activity is still urgent and vital to reduce the need for high concentrations of substrates. A series of binary metal sulfides (Fe x Ni1–x S2), which exhibited intrinsic nanozymic activity, was first synthesized by a hydrothermal method. Among these samples, the nanosheet-shaped Fe0.8Ni0.2S2 showed the highest activity. Compared with those of FeS2, the catalytic constant (K cat) and catalytic efficiency (K cat/K m ) of Fe0.8Ni0.2S2 increased about 1.9 and 3.6 times, respectively. The Michaelis–Menten constant (K m ) of Fe0.8Ni0.2S2 is about 4.7-fold smaller than that of FeS2, and 193-fold smaller than that of natural enzyme horseradish peroxidase (HRP), indicating a stronger affinity to H2O2. The investigation on the mechanism indicated that Fe2+ and Fe3+ in Fe0.8Ni0.2S2 are the active sites. The synergistic effect between Ni2+ and Fe3+ accelerated the conversion from Fe3+ to Fe2+, which improved the nanozymic activity. In addition, Fe0.8Ni0.2S2 can be used as a nanozyme to detect H2O2 and ascorbic acid (AA) within 1 min at room temperature (25 °C). This work extends the development of binary metal sulfides as artificial enzymes.

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Section: Resultsmentioning

confidence: 82%

Section: ■ Introductionmentioning

confidence: 63%

Improvement of Fe_0.8Ni_0.2S₂ Peroxidase-like Activity through the Accelerated Conversion from Fe³⁺ to Fe²⁺

Zhang

Nan

2022

J. Phys. Chem. C

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“…The deconvoluted Co 2p in Figure b depicts the Co 2p 3/2 located at 782.4 eV and Co 2p 1/2 located at 798.5 eV. The Co 2p 3/2 and Co 2p 1/2 are divided into two separating peaks, attributed to the Co 2+ and Co 3+ oxidation states, respectively, while the peaks at 785.6 and 803.2 eV are assigned to the satellite peak of Co 2+ . , The high-resolution Fe 2p spectrum as displayed in Figure c is separated into two doublets at 711.6 and 724.2 eV, corresponding to Fe 2p 3/2 and Fe 2p 1/2 , respectively . The characteristic peaks of Fe 2p 3/2 and Fe 2p 1/2 are ascribed to the different valences of Fe 2+ and Fe 3+ .…”

Section: Resultsmentioning

confidence: 95%

“…40,41 The elemental composition and valences of the FeCoS 2 /NG composite were further investigated by XPS analysis, as shown in The high-resolution Fe 2p spectrum as displayed in Figure 5c is separated into two doublets at 711.6 and 724.2 eV, corresponding to Fe 2p 3/2 and Fe 2p 1/2 , respectively. 44 The characteristic peaks of Fe 2p 3/2 and Fe 2p 1/2 are ascribed to the different valences of Fe 2+ and Fe 3+ . 44 The peaks at 711.1 and 724.2 eV reveal the presence of Fe 2+ in the composites.…”

Section: Resultsmentioning

confidence: 97%

Facile Fabrication of Iron Cobalt Sulfide Nanoparticles within N-Doped Graphene for High-Performance Supercapacitors

Liu

Pan

et al. 2022

ACS Appl. Nano Mater.

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Supercapacitors (SCs) have been widely considered as they are competitive power sources for energy storage. Herein, we fabricated high-quality iron cobalt sulfide nanoparticles encapsulated on a N-doped graphene nanosheet (FeCoS 2 /NG) composite with a core−shell structure as an advanced positive electrode material for SCs by employing a simple, cost-effective, and scalable hydrothermal process. The thin NG shell-encapsulated FeCoS 2 core interconnects with each other, which shortens the length of the ion diffusion path between the electrode and electrolyte, resulting in superior electrochemical performance. Remarkably, the FeCoS 2 /NG composite exhibited a maximum specific capacitance of 1420 F g −1 at a current density of 1 A g −1 , an outstanding rate capability of 898 F g −1 at 30 A g −1 , and exceptional cycle life with 85.1% retention of its initial capacitance after 10,000 consecutive cycles. Notably, the fabricated asymmetric SCs of FeCoS 2 /NG//NG achieved an excellent energy density of 79.3 W h kg −1 at a power density of 804 W kg −1 and outstanding cycle stability (capacitance retention of 90.2% after 10,000 consecutive cycles). The prominent property of the FeCoS 2 /NG electrode provides an effective route in the application of energy storage.

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“…The final PCE of the DSSC was observed to be 7.84%. The efficiency of other materials such as FeS 2 /FeCoS 2 NPs (7.05%), Fe 2 CoO 4 NPs (3.71%), and platinum (7.54%) was less than the composite materials, showing the successful nature of work …”

Section: Pyrite In Photovoltaics: Current Researchmentioning

confidence: 98%

Iron Pyrite in Photovoltaics: A Review on Recent Trends and Challenges

Zaka

Alhassan

Nayfeh

2022

ACS Appl. Electron. Mater.

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With an increase in energy demand and the depletion of conventional fuels, solar cells are emerging as an excellent alternative, providing a sustainable and clean source. Solar cells consisting of different materials have been introduced in recent years, and the overall performance defined by these materials has a lot of potential to increase. Transition metal dichalcogenides have gained significant importance due to their advantageous properties and promising potential. Iron disulfide or pyrite is one such material that has risen as a favorable material for photovoltaics cells owing to its suitable band gap, high absorption coefficient, and low cost. Not only this, the “earth abundance” and nontoxicity have also increased its prospects as a photovoltaic material. This study aims to review recent progress on the synthesis of pyrite and its utilization in photovoltaics. Different methods used for the synthesis of pyrite are reviewed followed by the properties of pyrite, the challenges that hinder its efficiency, and the possibilities of further research in this area.

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FeS2/FeCoS2 nanoparticles/reduced graphene oxide interfacial composite structure as highly reactive counter electrodes in dye-sensitized solar cells

Cited by 9 publications

References 38 publications

Improvement of Fe_0.8Ni_0.2S₂ Peroxidase-like Activity through the Accelerated Conversion from Fe³⁺ to Fe²⁺

Improvement of Fe_0.8Ni_0.2S₂ Peroxidase-like Activity through the Accelerated Conversion from Fe³⁺ to Fe²⁺

Facile Fabrication of Iron Cobalt Sulfide Nanoparticles within N-Doped Graphene for High-Performance Supercapacitors

Iron Pyrite in Photovoltaics: A Review on Recent Trends and Challenges

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FeS2/FeCoS2 nanoparticles/reduced graphene oxide interfacial composite structure as highly reactive counter electrodes in dye-sensitized solar cells

Cited by 9 publications

References 38 publications

Improvement of Fe0.8Ni0.2S2 Peroxidase-like Activity through the Accelerated Conversion from Fe3+ to Fe2+

Improvement of Fe0.8Ni0.2S2 Peroxidase-like Activity through the Accelerated Conversion from Fe3+ to Fe2+

Facile Fabrication of Iron Cobalt Sulfide Nanoparticles within N-Doped Graphene for High-Performance Supercapacitors

Iron Pyrite in Photovoltaics: A Review on Recent Trends and Challenges

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Improvement of Fe_0.8Ni_0.2S₂ Peroxidase-like Activity through the Accelerated Conversion from Fe³⁺ to Fe²⁺

Improvement of Fe_0.8Ni_0.2S₂ Peroxidase-like Activity through the Accelerated Conversion from Fe³⁺ to Fe²⁺