Rational integration of hierarchical structural CoS1.097 nanosheets/reduced graphene oxide nanocomposites with enhanced electrocatalytic performance for triiodide reduction

Yuan, Hong; Liu, Jia; Li, Hansheng; Su, Kuo-Lan; Liu, Xiufeng; Li, Yongjian; Shi, Daxin; Wu, Qin; Zhao, Yun; Jiao, Qingze

doi:10.1016/j.carbon.2017.10.067

Cited by 23 publications

(15 citation statements)

References 51 publications

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“…The enhanced transition of CoS x into CoOOH induces a great improvement of the OER performance with the hybrid NGF/CoS x as shown in Figure . Previous reports have shown that the integration of carbon additives and cobalt sulfide can effectively increase the electroactive sites on the catalyst during the OER. − Obviously, in all the tested samples in this study, the hybrid material of CoS x /NGF has the best OER response (Table S1) by rendering the smallest overpotential of 330 mV at 10 mA cm –2 catalytic current density (Figure a,b), highest current density of 21.5 mA cm –2 at 350 mV overpotential (Figure c), lowest Tafel slope of 62 mV dec –1 (inset of Figure a and Figure d), largest ECSA of 45.5 mF cm –2 (Figure e and Figure S13) and optimized resistance illustrated by EIS (Figure S14. More analyses and discussion on EIS can be found in Figure S15 and Table S2).…”

Section: Resultsmentioning

confidence: 70%

Direct Observation of Structural Evolution of Metal Chalcogenide in Electrocatalytic Water Oxidation

et al. 2018

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As one of the most remarkable oxygen evolution reaction (OER) electrocatalysts, metal chalcogenides have been intensively reported during the past few decades because of their high OER activities. It has been reported that electron-chemical conversion of metal chalcogenides into oxides/hydroxides would take place after the OER. However, the transition mechanism of such unstable structures, as well as the real active sites and catalytic activity during the OER for these electrocatalysts, has not been understood yet; therefore a direct observation for the electrocatalytic water oxidation process, especially at nano or even angstrom scale, is urgently needed. In this research, by employing advanced Cs-corrected transmission electron microscopy (TEM), a step by step oxidational evolution of amorphous electrocatalyst CoS x into crystallized CoOOH in the OER has been in situ captured: irreversible conversion of CoS x to crystallized CoOOH is initiated on the surface of the electrocatalysts with a morphology change via Co(OH) 2 intermediate during the OER measurement, where CoOOH is confirmed as the real active species. Besides, this transition process has also been confirmed by multiple applications of X-ray photoelectron spectroscopy (XPS), in situ Fourier-transform infrared spectroscopy (FTIR), and other ex situ technologies. Moreover, on the basis of this discovery, a high-efficiency electrocatalyst of a nitrogen-doped graphene foam (NGF) coated by CoS x has been explored through a thorough structure transformation of CoOOH. We believe this in situ and in-depth observation of structural evolution in the OER measurement can provide insights into the fundamental understanding of the mechanism for the OER catalysts, thus enabling the more rational design of low-cost and high-efficient electrocatalysts for water splitting.

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Section: Resultsmentioning

confidence: 70%

Direct Observation of Structural Evolution of Metal Chalcogenide in Electrocatalytic Water Oxidation

et al. 2018

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“…Then, cobalt chloride hexahydrate (1 mmol) and l ‐cysteine (1.1 mmol) were dissolved and poured into autoclaves; the solvothermal process was conducted at 180 °C for 16 h, where GO was transformed into rGO and the final obtained product was CoS 1.097 /RGO. [ 108 ] Meng et al also synthesized the composite of graphene/cobalt sulfide using the solvothermal process, at 200 °C for 18 h. [ 109 ]…”

Section: Synthesis Methodologiesmentioning

confidence: 99%

“…Then, cobalt chloride hexahydrate (1 mmol) and L-cysteine (1.1 mmol) were dissolved and poured into autoclaves; the solvothermal process was conducted at 180 C for 16 h, where GO was transformed into rGO and the final obtained product was CoS 1.097 /RGO. [108] Meng et al also synthesized the composite of graphene/cobalt sulfide using the solvothermal process, at 200 C for 18 h. [109] The synthesis methodologies of the individual metal sulfides as well as hybrid electrodes with carbon materials reveal that the major difference is the addition of carbon materials. The synthesis of carbon materials is a separate wide field of research and applications, whereas their synthesis was conducted usually in the concentrated acidic medium.…”

Section: Synthesis Of Carbon Materials-based Metal Sulfide Hybrid Ele...mentioning

confidence: 99%

Design of Metals Sulfides with Carbon Materials for Supercapacitor Applications: A Review

Iqbal

Ashiq

2021

Energy Tech

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Supercapacitors are very exclusive among energy‐storage devices for the wearable and portable industry. Due to simplicity, abundance occurrence, good electrical conductivity, and rich redox states, metal sulfides have a significant impact in supercapacitor applications in the present decade. Sulfur is the anion, associated with metal cations, and provides substantial tunable electrochemical, electrical, physical, and chemical properties in metal sulfides. In addition, carbonaceous materials enhance the electrochemical characteristics of metal sulfides synergistically for supercapacitors. Fast and scalable synthesis and fabrication of the supercapacitor cell with low‐cost metal sulfides and heterostructures should be developed to achieve the potential applications of these hybrid glorious materials. Herein, the significant and critical discussion of metal sulfides synthesis and their hybrid with carbon electrode structures for supercapacitor applications is disclosed. The realistic synthesis of metal sulfides, basic charge storage phenomena to elaborate the electrode nature, electrochemical properties including a single electrode, and asymmetric and symmetric cells are demonstrated for comparative purposes. The market values and application of supercapacitors are also elaborated. Herein, a better understanding to fresh readers about metal sulfide hybrid electrode structures for supercapacitors is provided.

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“…All of the electrochemical measurements were measured on an electrochemical working station (CHI 604E) and the test details could be referenced by our previous works. , It should be noted that the light intensity was calibrated using a Si solar cell (National Institute of Metrology, China).…”

Section: Methodsmentioning

confidence: 99%

Rational Design of Hierarchical Structural CoSe@NPC/CoSe@CNT Nanocomposites Derived from Metal–Organic Frameworks as a Robust Pt-free Electrocatalyst for Dye-Sensitized Solar Cells

Wang

et al. 2020

ACS Omega

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Transition-metal compounds/carbon hybrids with high electrocatalytic capability possess attractive potential as a counter electrode (CE) for dye-sensitized solar cells (DSSCs). However, the simple structure and agglomeration always result in poor performance. Herein, cobalt selenides confined in hollow N-doped porous carbon interconnected by carbon nanotubes (CNTs) with cobalt selenides encapsulated inside (denoted as CoSe@NPC/CoSe@CNTs) are formed through in situ pyrolysis and selenization process. In this strategy, ZIF-67 is used as the precursor, structure inducer, and carbon source for the orientated growth of CNTs. Such a rational architecture provides a stable interconnected conductive network and a hierarchically porous structure, with more available active sites and a shortened pathway for charge transport, synergistically enhancing the electrocatalytic activity. Specifically, the DSSCs based on CoSe@NPC/CoSe@CNTs demonstrate a high efficiency of 7.36%, even superior to that of Pt (7.16%). Furthermore, the CoSe@NPC/CoSe@CNT CE also demonstrates a good long-term stability in the iodine-based electrolyte.

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Rational integration of hierarchical structural CoS1.097 nanosheets/reduced graphene oxide nanocomposites with enhanced electrocatalytic performance for triiodide reduction

Cited by 23 publications

References 51 publications

Direct Observation of Structural Evolution of Metal Chalcogenide in Electrocatalytic Water Oxidation

Direct Observation of Structural Evolution of Metal Chalcogenide in Electrocatalytic Water Oxidation

Design of Metals Sulfides with Carbon Materials for Supercapacitor Applications: A Review

Rational Design of Hierarchical Structural CoSe@NPC/CoSe@CNT Nanocomposites Derived from Metal–Organic Frameworks as a Robust Pt-free Electrocatalyst for Dye-Sensitized Solar Cells

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