Co/Co9S8@S,N-doped porous graphene sheets derived from S, N dual organic ligands assembled Co-MOFs as superior electrocatalysts for full water splitting in alkaline media

Zhang, Xian; Liu, Shengwen; Zang, Yipeng; Liu, Rongrong; Liu, Guoqiang; Wang, Guozhong; Zhang, Yunxia; Zhang, Haimin; Zhao, Huijun

doi:10.1016/j.nanoen.2016.09.040

Cited by 263 publications

(130 citation statements)

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“…In order to interpret the intrinsic synergistic effect we have conducted high resolution XPS spectrum analysis at N1sa nd Co 2p regions, respectively.C ompared to the XPS spectrum of pure Co 9 S 8 (781.7 and 797.3 eV), as hift in the bindinge nergies of Co 2p to the corresponding lower value in CoS x @POP is observed, attributed to as trong interaction between Co 9 S 8 and POP caused by the intrinsics ynergistic effect between Co and POP by charge transfer of electrons (Figure 6c). [46] It is worth mentioning here that the photo- current recorded with CoS x @POP photocathode is found to be comparable to many recently reported photocathodes comprised of polymer and/or cobaltc halcogenides. Figure 7a shows the current density-potential responses of the CoS x @POP heterocomposite photocathode in 0.5 m Na 2 SO 4 solution at pH 6.5 under simulated solar illumination of 1.5 AM.…”

Section: Resultssupporting

confidence: 84%

“…Similarly,t he positive displacement in the binding energies in the N1Ss pectrum of CoS x @POP compared with the bare POP demonstrated the interaction between the N-rich POP and cobalt sulfide nanoparticles which builds a" bridge"f or the charge transfer between POP and Co 9 S 8 (Figure 6f). [22,45,46] The reversibility of the photoactivity of the as-prepared photocathodes was investigated using amperometricm easurements at relativelyh igher appliedv oltage of À0.7 Vv ersus RHE. For the sake of completeness of the experiment, Co 3 O 4 @POP, CoS x and spinel Co 3 O 4 species were takena sc ontrols.…”

Section: Resultsmentioning

confidence: 99%

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The Design of a New Cobalt Sulfide Nanoparticle Implanted Porous Organic Polymer Nanohybrid as a Smart and Durable Water‐Splitting Photoelectrocatalyst

Shit

Khilari

Mondal

et al. 2017

Chemistry A European J

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Development of an inexpensive, efficient and robust nanohybrid catalyst as a substitute for platinum in photoelectrocatalytic hydrogen production has been considered intriguing and challenging. In this study, the design and sequential synthesis of a novel cobalt sulfide nanoparticle grafted Porous Organic Polymer nanohybrid (CoS @POP) is reported and used as an active and durable water-splitting photoelectrocatalyst in the hydrogen evolution reaction (HER). The specific textural and relevant chemical properties of as-synthesised nanohybrid materials (Co O @POP &CoS @POP) were investigated by means of XRD, XPS, FTIR, C CP MAS NMR, spectroscopy, HR-TEM, HAADF-STEM with the corresponding elemental mapping, FE-SEM and nitrogen physisorption studies. CoS @POP has been evaluated as a superior photoelectrocatalyst in HER, achieving a current density of 6.43 mA cm at 0 V versus the reversible hydrogen electrode (RHE) in a 0.5 m Na SO electrolyte which outperforms its Co O @POP analogue. It was found that the nanohybrid CoS @POP catalyst exhibited a substantially enhanced catalytic performance of 1.07 μmol min cm , which is considered to be ca. 10 and 1.94 times higher than that of pristine POP and CoS , respectively. Remarkable photoelectrocatalytic activity of CoS @POP compared to Co O @POP toward H evolution could be attributed to intrinsic synergistic effect of CoS and POP, leading to the formation of a unique CoS @POP nanoarchitecture with high porosity, which permits easy diffusion of electrolyte and efficient electron transfer from POP to CoS during hydrogen generation with a tunable bandgap, that straddles between the reduction and oxidation potential of water.

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Section: Resultssupporting

confidence: 84%

Section: Resultsmentioning

confidence: 99%

The Design of a New Cobalt Sulfide Nanoparticle Implanted Porous Organic Polymer Nanohybrid as a Smart and Durable Water‐Splitting Photoelectrocatalyst

Shit

Khilari

Mondal

et al. 2017

Chemistry A European J

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“…However,t he high cost and limitedr eserves of noble metals greatlyp rohibit their largescale commercial applications. [16][17][18] Generally,c arbonbased catalysts are in the form of fine powders, tested by drop-coating on glass carbon electrodes or nickel foamsb y using ap olymer binder (such as Nafion). [8][9][10][11][12] Co 9 S 8 is ap romising materialt hat has been demonstrated to have superb electrochemical performance for a varietyo fa pplications,f or instance, lithium-ion ands odium-ion batteries, supercapacitors, HER, and OER.…”

Section: Introductionmentioning

confidence: 99%

Co₉S₈‐Catalyzed Growth of Thin‐Walled Graphite Microtubes for Robust, Efficient Overall Water Splitting

et al. 2018

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Co9S8 crystals can catalyze the growth of thin‐walled graphite microtubes (GMTs) through a catalytic chemical vapor deposition (CCVD) process using thiourea as the precursor. The growth of GMTs follows a tip‐growth mechanism with tube diameters up to a few micrometer. The hollow interiors of the GMTs are filled with carbon nanotubes and wrinkled graphene layers, which form a unique nanotube/graphene‐in‐microtube structure. As‐formed GMTs are N,S‐codoped with lots of Co9S8 nanoparticles encapsulated in their inner walls. These GMTs are room‐temperature ferromagnets and can be loaded on Ni foams to work as binder‐free electrocatalysts with low overpotential (310 mV at 50 mA cm−2 for the oxygen evolution reaction (OER) and 284 mV at 50 mA cm−2 for the hydrogen evolution reaction (HER)) and long‐term durability (continuous work for 120 h without loss in performance). Our research proves that metal sulfides can catalyze the growth of graphite microtubes and as‐formed GMTs may potentially be used as functional building blocks to construct new kinds of electrochemical devices for various energy‐related applications.

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“…Interestingly, the nanocomposites with heteroatoms self‐doped nanocarbons can be synthesized by employing the heteroatoms‐containing ligands. By using the sulfur‐containing thiophene‐2,5‐dicarboxylate (Tdc) and nitrogen‐containing 4,4′‐bipyrydine (Bpy) simultaneously, the S, N‐Co‐MOF/GO was formed, which was transformed into Co/Co 9 S 8 core–shell structures on S,N‐codoped porous graphene sheets by simply annealing in N 2 under high temperature without use of other S and N sources …”

Section: Mof Composites With Carbon‐based Materialsmentioning

confidence: 99%

Rational Microstructure Design on Metal–Organic Framework Composites for Better Electrochemical Performances: Design Principle, Synthetic Strategy, and Promotion Mechanism

et al. 2020

Small Methods

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Metal–organic frameworks (MOFs) simultaneously containing metal ions and organic ligands have recently shown great potential for application in energy storage and conversion fields due to their controllable conversion into carbon materials or various metal species, which often exhibit superior electrochemical performance as electrode materials for energy storage and conversion. Nevertheless, the electrochemical energy storage performance of MOF derivatives can still be further enhanced through building composites with other functional materials. It is of great significance in developing new strategies of fabricating MOF composites to achieve electrode materials with improved charge transfer and electrochemical redox reaction kinetics. In this review, the novel design and strategies of MOF composites with various functional components are focused on, including carbon‐based materials (carbon nanotubes, graphene, etc.), metal oxides, 3D conductive substrates, polymeric materials, and the second MOFs and metal salts, especially their derivatives for energy storage and conversion fields. The key factors for controllable synthesis of various MOF composites and electrochemical performance enhancement mechanisms are discussed in detail. It is expected that this review will provide new inspiration for the development of MOF derivatives for energy storage and conversion.

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Co/Co9S8@S,N-doped porous graphene sheets derived from S, N dual organic ligands assembled Co-MOFs as superior electrocatalysts for full water splitting in alkaline media

Cited by 263 publications

References 50 publications

The Design of a New Cobalt Sulfide Nanoparticle Implanted Porous Organic Polymer Nanohybrid as a Smart and Durable Water‐Splitting Photoelectrocatalyst

The Design of a New Cobalt Sulfide Nanoparticle Implanted Porous Organic Polymer Nanohybrid as a Smart and Durable Water‐Splitting Photoelectrocatalyst

Co₉S₈‐Catalyzed Growth of Thin‐Walled Graphite Microtubes for Robust, Efficient Overall Water Splitting

Rational Microstructure Design on Metal–Organic Framework Composites for Better Electrochemical Performances: Design Principle, Synthetic Strategy, and Promotion Mechanism

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Co/Co9S8@S,N-doped porous graphene sheets derived from S, N dual organic ligands assembled Co-MOFs as superior electrocatalysts for full water splitting in alkaline media

Cited by 263 publications

References 50 publications

The Design of a New Cobalt Sulfide Nanoparticle Implanted Porous Organic Polymer Nanohybrid as a Smart and Durable Water‐Splitting Photoelectrocatalyst

The Design of a New Cobalt Sulfide Nanoparticle Implanted Porous Organic Polymer Nanohybrid as a Smart and Durable Water‐Splitting Photoelectrocatalyst

Co9S8‐Catalyzed Growth of Thin‐Walled Graphite Microtubes for Robust, Efficient Overall Water Splitting

Rational Microstructure Design on Metal–Organic Framework Composites for Better Electrochemical Performances: Design Principle, Synthetic Strategy, and Promotion Mechanism

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Co₉S₈‐Catalyzed Growth of Thin‐Walled Graphite Microtubes for Robust, Efficient Overall Water Splitting