Fe-doped Co 9 S 8 nanosheets on carbon fiber cloth as pH-universal freestanding electrocatalysts for efficient hydrogen evolution

Ao, Kelong; Li, Dawei; Yao, Yixin; Lv, Pengfei; Cai, Yibing

doi:10.1016/j.electacta.2018.01.080

Cited by 39 publications

(25 citation statements)

References 43 publications

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“…The lower Tafel slope indicates the faster kinetics process . As exhibited in Figure b, the commercially available Pt/C possesses the lowest Tafel slope of 32.8 mV dec −1 , which is consistent with the reported results . GTCo900 also shows a low Tafel slope of 47.3 mV dec −1 , which is much lower than those of GTCo800 (109.4 mV dec −1 ) and GTCo1000 (59.1 mV dec −1 ).…”

Section: Methodssupporting

confidence: 88%

“…The elements of S, C, N, O, and Co can clearly be detected, which indicates that GTCo900 consists of these elements. As exhibited in Figure a, the high‐resolution C 1s spectrum can be divided into four peaks, which can correspond to C=C−C bonds (284.8 eV), C−S bonds (285.5 eV), C−N bonds (286.3 eV), and C=O bonds (288.3 eV), which reflects that sulfur atoms and nitrogen atoms both dope into the carbonaceous matrix . As exhibited in Figure b, the high‐resolution N 1s spectrum can be resolved into three peaks located at 397.9, 398.6, and 400.8 eV, which can be indexed to pyridinic N, pyrrolic N, and graphitic N, respectively .…”

Section: Methodsmentioning

confidence: 93%

“…To tackle these issues, non‐noble metal contained materials have received considerable researches . Among all of the catalysts, numerous efforts have been focused on Co 9 S 8 ‐based composites, which are proved to reveal superior electrocatalytic performance for HER …”

Section: Methodsmentioning

confidence: 99%

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Nitrogen and Sulfur Co‐Doped Mesoporous Carbon Embedded with Co₉S₈ Nanoparticles: Efficient Electrocatalysts for Hydrogen Evolution

Tang

Huang

et al. 2019

ChemPlusChem

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Co9S8 embedded, N,S co‐doepd mesoporous carbon materials were synthesized by adopting CoCl2 as the molten salt. In details, CoCl2 and glucose were used as cobalt and carbon precursors, respectively, and thiourea was utilized as sulfur and nitrogen precursors. This synthetic process involved three steps, including hand‐milling, carbonation, and acid leaching. The results of characterization exhibited that the final products had mesoporous structures, which also showed high nitrogen and sulfur contents. Moreover, the Co9S8 nanoparticles dispersed evenly in the carbonaceous matrix. Furthermore, the calcining temperature could affect the porosities of the final products and the contents of the heteroatoms, which could further determine the electrocatalytic activities of these catalysts. When used as the electrocatalysts for hydrogen evolution reaction, the optimal catalyst, GTCo900, exhibited superior catalytic activities under acidic condition. The overpotential is 62 mV to afford a current density of 10 mA cm−2. Moreover, it could also reveal excellent stability for 12 h.

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Section: Methodssupporting

confidence: 88%

Section: Methodsmentioning

confidence: 93%

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Nitrogen and Sulfur Co‐Doped Mesoporous Carbon Embedded with Co₉S₈ Nanoparticles: Efficient Electrocatalysts for Hydrogen Evolution

Tang

Huang

et al. 2019

ChemPlusChem

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“…Figure illustrates the expanded Co 2p 3/2 XPS spectra of spent catalysts. Four deconvoluted peaks detected at binding energies of 778.3 to 778.6, 780.1 to 780.8, 781.8 to 782.2, and 784.9 to 785.1 eV were assigned to the corresponding metallic Co 0 , Co 3 O 4 , spinel CoAl 2 O 4 , and shake‐up satellite for both spent catalysts as summarized in Table . The existence of these phases on spent catalyst surface is corroborated with XRD results (cf Figure ).…”

Section: Resultssupporting

confidence: 86%

Stability evaluation of ethanol dry reforming on Lanthania‐doped cobalt‐based catalysts for hydrogen‐rich syngas generation

et al. 2018

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Summary Catalytic stability with time‐on‐stream is an important aspect in ethanol dry reforming (EDR) since catalysts could encounter undesirable deterioration arising from deposited carbon. This work examined the promotional effect of La on 10%Co/Al2O3 in terms of activity, stability, and characteristics. Catalysts were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman, and X‐ray photoelectron spectroscopy (XPS) measurements whilst catalytic EDR performance of La‐promoted and unpromoted 10%Co/Al2O3 prepared via wet impregnation technique was investigated at 973 K for 72 h using a stoichiometric feed ratio (C2H5OH/CO2 = 1/1). La promoter substantially enhanced both metal dispersion and metal surface area from 0.11% to 0.64% and 0.08 to 0.43 m2 g−1, respectively. Ethanol and CO2 conversions appeared to be stable within 50 to 72 h after experiencing an initial activity drop. The conversion of C2H5OH and CO2 for La‐promoted catalyst was about 1.65 and 1.34 times greater than unpromoted counterpart in this order. The carbonaceous deposition was considerably decreased from 55.6% to 36.8% with La promotion due to La2O2CO3 intermediate formation. Additionally, 3%La‐10%Co/Al2O3 possessed greater oxygen vacancies acting as active sites for CO2 adsorption and hence increasing carbon gasification. Even though graphitic and filamentous carbons were formed on used catalyst surface, La‐addition diminished graphite formation and increased the reactiveness of amorphous carbon.

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“…19 If the non-noble metals electrocatalysts are grown on carbon material substrates, doping with homologous elements not only reduces the catalytic resistance but also exposes more active sites. [20][21][22] Furthermore, the formation of epitaxial heterostructures can regulate the energy barrier between the two interfaces to reduce the catalytic kinetic energy. [23][24][25] In this work, we prepared Co-FeS 2 /CoS 2 heterostructures electrocatalysts on a carbon cloth (CC) by using sulfur powder and thiourea as sulfur sources and show that they have excellent catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Co–FeS₂/CoS₂ heterostructures as a superior bifunctional electrocatalyst

Guo

Yan

et al. 2018

RSC Adv.

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The traditional method of preparing hydrogen and oxygen as efficient clean energy sources mainly relies on the use of platinum, palladium, and other precious metals. However, the high cost and low abundance limit wide application of such metals. As such, one challenging issue is the development of low-cost and highefficiency electrocatalysts for such purposes. In this study, we synthesized Co-FeS 2 /CoS 2 heterostructures via a hydrothermal method for efficient hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Benefitting from their unique three-dimensional hierarchical nanostructures, Co-doped FeS 2 , and CoS 2 formed heterostructures on Co-FeS 2 petals, which bestowed remarkable electrocatalytic properties upon Co-FeS 2 /CoS 2 nanostructures. Co-FeS 2 /CoS 2 effectively catalyzed the OER with an overpotential of 278 mV at a current density of 10 mA cm À2 in 1 M KOH solution, and also is capable of driving a current density À10 mA cm À2 at an overpotential of À103 mV in 0.5 M H 2 SO 4 solution. The overpotential of the OER and HER only decreased by 5 mV and 3 mV after 1000 cycles. Our Co-FeS 2 / CoS 2 materials may offer a promising alternative to noble metal-based electrocatalysts for water splitting.

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Fe-doped Co 9 S 8 nanosheets on carbon fiber cloth as pH-universal freestanding electrocatalysts for efficient hydrogen evolution

Cited by 39 publications

References 43 publications

Nitrogen and Sulfur Co‐Doped Mesoporous Carbon Embedded with Co₉S₈ Nanoparticles: Efficient Electrocatalysts for Hydrogen Evolution

Nitrogen and Sulfur Co‐Doped Mesoporous Carbon Embedded with Co₉S₈ Nanoparticles: Efficient Electrocatalysts for Hydrogen Evolution

Stability evaluation of ethanol dry reforming on Lanthania‐doped cobalt‐based catalysts for hydrogen‐rich syngas generation

Hierarchical Co–FeS₂/CoS₂ heterostructures as a superior bifunctional electrocatalyst

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Fe-doped Co 9 S 8 nanosheets on carbon fiber cloth as pH-universal freestanding electrocatalysts for efficient hydrogen evolution

Cited by 39 publications

References 43 publications

Nitrogen and Sulfur Co‐Doped Mesoporous Carbon Embedded with Co9S8 Nanoparticles: Efficient Electrocatalysts for Hydrogen Evolution

Nitrogen and Sulfur Co‐Doped Mesoporous Carbon Embedded with Co9S8 Nanoparticles: Efficient Electrocatalysts for Hydrogen Evolution

Stability evaluation of ethanol dry reforming on Lanthania‐doped cobalt‐based catalysts for hydrogen‐rich syngas generation

Hierarchical Co–FeS2/CoS2 heterostructures as a superior bifunctional electrocatalyst

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Product

Resources

About

Nitrogen and Sulfur Co‐Doped Mesoporous Carbon Embedded with Co₉S₈ Nanoparticles: Efficient Electrocatalysts for Hydrogen Evolution

Nitrogen and Sulfur Co‐Doped Mesoporous Carbon Embedded with Co₉S₈ Nanoparticles: Efficient Electrocatalysts for Hydrogen Evolution

Hierarchical Co–FeS₂/CoS₂ heterostructures as a superior bifunctional electrocatalyst