Highly stable supercapacitors with MOF-derived Co<sub>9</sub>S<sub>8</sub>/carbon electrodes for high rate electrochemical energy storage

Zhang, Shuo; Li, Daohao; Chen, Shuai; Yang, Xianfeng; Zhao, Xiaoliang; Zhao, Quansheng; Komarneni, Sridhar; Yang, Dongjiang

doi:10.1039/c7ta03070c

Cited by 189 publications

(72 citation statements)

References 55 publications

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“…The peaks at around 161.7 eV and 162.4 eV are assigned to Co−S 2p 3/2 and Co−S 2p 1/2 , and the peaks at around 163.6 eV and 164.9 eV are attributed to S−C 2p 3/2 and S−C 2p 1/2 . Besides, the peaks at 168.0 eV and 169.1 eV correspond to C−SO x −C and SO 4 2− , respectively . It is important to mention that S−C and Co−S can act as favorable active sites for enhancing ORR active performance in as‐prepared catalysts .…”

Section: Resultsmentioning

confidence: 97%

Cobalt Nanoparticles Embedded in N, S Co‐Doped Carbon towards Oxygen Reduction Reaction Derived by in situ Reducing Cobalt Sulfide

Dong

Zhang

et al. 2019

ChemCatChem

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Herein, a novel electrocatalysts of cobalt nanoparticles embedded in N, S co-doped carbon matrix derived by in situ reducing Co 9 S 8 are designed and prepared successfully through two-calcination methods, and applied for oxygen reduction reaction (ORR). Due to the large surface area and pore volume, richness of defects existing the carbon nanotubes, interaction of S species and N species and special direction of electron transfers between Co and S ions, the earth-abundant and lowcost CoSMe-0.5-800 presents a highly efficient ORR activity and stability. The onset potential, half-wave potential and limiting current density of CoSMe-0.5-800 are 0.95 V, 0.85 V, and 4.31 mA cm À 2 , which are higher than that of commercial Pt/C (0.93 V, 0.83 V, 4.19 mA cm À 2 ). More importantly, the interaction between N and S heteroatoms in system gets revealed, that S resources can help to improve the degree of N doping and raise the ratio of pyridinic N species working as the active site for ORR. With the increase of S resources, electrons that should have been transferred from cobalt to sulfur have moved in the opposite direction, which has a negative effect on ORR active performance. This work shows the potential to design advanced Co-based N, S co-doped catalysts with high electrochemical performance and low cost, which could be applied for fuel cells and other devices.[a] Z.

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Section: Resultsmentioning

confidence: 97%

Cobalt Nanoparticles Embedded in N, S Co‐Doped Carbon towards Oxygen Reduction Reaction Derived by in situ Reducing Cobalt Sulfide

Dong

Zhang

et al. 2019

ChemCatChem

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“…The synthesis path to Co/N‐r‐GO‐850 is charted in Scheme , a series of catalysts with different GO contents (−2, −5, −10, and −15 wt%), Co/N‐r‐GO (−2, −5, −10, and −15%), were prepared from the mixture of DUT‐58 and GO by a solvothermal and calcination process. DUT‐58 was chosen as the one of the catalyst precursors owing to its porous framework and high nitrogen content from the ligand . GO as the other one precursor converted into r‐GO through the calcinations which will generate better conductivity .…”

Section: Resultsmentioning

confidence: 99%

DUT‐58 (Co) Derived Synthesis of Co Clusters as Efficient Oxygen Reduction Electrocatalyst for Zinc–Air Battery

et al. 2017

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To meet the requirement of fuel cells and metal–air batteries, non‐noble metal catalysts have to be developed to replace precious platinum‐based catalysts. Herein, Co nanoclusters (≈2 nm) are anchored on nitrogen‐doped reduced graphene oxide (Co/N‐r‐GO) by using DUT‐58 (Co) metal–organic framework and GO as precursors. Compared with single‐atom catalysts usually with ultralow concentration (<0.5 wt%), Co nanoclusters are more beneficial to break the O—O bond to ensure four electronic way for oxygen reduction reaction (ORR), since they can provide more adsorption centers for reactants. Therefore, as expected, the sample with 6.67 wt% Co content (Co/N‐r‐GO‐5%‐850) exhibits better ORR activity with a higher half‐wave potential of 0.831 V, a more positive onset potential of 0.921 V than Pt/C, and a comparable limiting current density in alkaline medium. The Co nanoclusters enhance the catalytic performance for ORR in three aspects: quantum size effects, metal–support interactions, and low‐coordination environment of metal centers. Furthermore, the sample is assembled into a zinc–air battery as the outstanding durable ORR catalyst. It displays a higher specific capacity (795 mAh g −1 at the current density 50 mA cm −2 ) and power density (175 mW cm −2 ) than Pt/C (731 mAh g −1 and 164 mW cm −2 , respectively).

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“…After a series of electrochemical inspections, the activated porous carbon, which was referred to as APC‐DMF, exhibited the best porous properties and largest specific capacitances (153 F g −1 at 5 mV s −1 and 156 F g −1 at 0.50 A g −1 ). Furthermore, metal sulfide carbon composites also have wide applications . Co 9 S 8 nanoparticles embedded in N, S‐codoped carbon (Co 9 S 8 /NS‐C) were synthesized to be an electrode material for SCs, and exhibited large specific capacity (734F g −1 at 1 A g −1 ), excellent rate performance (653 F g −1 at 10 A g −1 ) and superior cyclic stability (99.80% capacitance retention after 140 000 cycles).…”

Section: Supercapacitorsmentioning

confidence: 99%

Applications of Metal–Organic‐Framework‐Derived Carbon Materials

et al. 2018

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production, especially for hydroelectricity, sunlight, and wind energy, which cannot be gathered or released when they are needed. [5][6][7][8] Electrochemical energy storage devices provide a promising approach for the storage of electric energy from these sources. [9][10][11] Currently, carbonaceous materials have attracted much interest for their extensive applications including adsorption, [12] catalysis, [13] batteries, [14] fuel cells, [15,16] supercapacitors, [17,18] and drug delivery and imaging. [19] In addition, some sensors are also one of the important applications of carbonaceous materials, because they are closely related to human health. [20,21] For instance, Emran and co-workers [22] constructed ultrasensitive biosensors with N-doped mesoporous carbon (NMC)-based electrodes for in vitro monitoring of DA released from living cells. With the further study of the experiment, they also designed a series of S-doped carbon materials for a wider detection of DA, UA (uric acid), and AA (ascorbic acid). [23,24] The advantages of easy preparing, nontoxic and excellent electrical conductivity of carbonaceous materials, which are rare among energy storage materials, make carbonaceous materials superior to most of the energy storage materials. [25][26][27] There are varieties of approaches for the preparation of carbon materials, such as directly carbonizing from organic precursors, physically or chemically carbonizing from carbon, template methods using zeolites and mesoporous silica, solvothermal and hydrothermal methods with elevated temperature, the electrical arc methods, and chemical vapor decomposition (CVD) methods. [28][29][30][31][32][33][34] Among all these approaches, directly carbonizing from organic precursors is the most frequently used method to prepare nanoporous carbons (NPCs) due to its flexibility and simplicity. [35][36][37] However, these NPC materials present certain drawbacks, such as low surface areas, disordered structures, and ununiformed sizes, which will greatly limit their applications. [25] As studies have progressed, researchers found that carbon materials derived from metalorganic frameworks (MOFs) could overcome these limitations.Metal-organic frameworks, which are also named porous coordination polymers (PCPs), are crystalline porous materials with periodic network structures formed by metal ions (or metal clusters) and organic ligands. [38][39][40][41][42] They are usually prepared by solvothermal methods and used as precursors or templates to form nanostructured materials. [43][44][45] So far, many researchers have highlighted the advantages of MOFs. For Carbon materials derived from metal-organic frameworks (MOFs) have attracted much attention in the field of scientific research in recent years because of their advantages of excellent electron conductivity, high porosity, and diverse applications. Tremendous efforts are devoted to improving their chemical and physical properties, including optimizing the morphology and structure of the carbon materials, compositing them wi...

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Highly stable supercapacitors with MOF-derived Co₉S₈/carbon electrodes for high rate electrochemical energy storage

Abstract: MOF-derived Co9S8nanoparticles embedded in carbon doped with N and S showed super stability and high rate performance for supercapacitors.

Cited by 189 publications

References 55 publications

Cobalt Nanoparticles Embedded in N, S Co‐Doped Carbon towards Oxygen Reduction Reaction Derived by in situ Reducing Cobalt Sulfide

Cobalt Nanoparticles Embedded in N, S Co‐Doped Carbon towards Oxygen Reduction Reaction Derived by in situ Reducing Cobalt Sulfide

DUT‐58 (Co) Derived Synthesis of Co Clusters as Efficient Oxygen Reduction Electrocatalyst for Zinc–Air Battery

Applications of Metal–Organic‐Framework‐Derived Carbon Materials

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Highly stable supercapacitors with MOF-derived Co9S8/carbon electrodes for high rate electrochemical energy storage

Abstract: MOF-derived Co9S8nanoparticles embedded in carbon doped with N and S showed super stability and high rate performance for supercapacitors.

Cited by 189 publications

References 55 publications

Cobalt Nanoparticles Embedded in N, S Co‐Doped Carbon towards Oxygen Reduction Reaction Derived by in situ Reducing Cobalt Sulfide

Cobalt Nanoparticles Embedded in N, S Co‐Doped Carbon towards Oxygen Reduction Reaction Derived by in situ Reducing Cobalt Sulfide

DUT‐58 (Co) Derived Synthesis of Co Clusters as Efficient Oxygen Reduction Electrocatalyst for Zinc–Air Battery

Applications of Metal–Organic‐Framework‐Derived Carbon Materials

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Highly stable supercapacitors with MOF-derived Co₉S₈/carbon electrodes for high rate electrochemical energy storage