Sustainable Synthesis of Co@NC Core Shell Nanostructures from Metal Organic Frameworks via Mechanochemical Coordination Self‐Assembly: An Efficient Electrocatalyst for Oxygen Reduction Reaction

Peera, Shaik Gouse; Balamurugan, Jayaraman; Lee, Joong Hee

doi:10.1002/smll.201800441

Cited by 160 publications

(83 citation statements)

References 60 publications

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“…High-valence state Co could provide evidence of Co-N, further indicating the interaction between Co and N[43]. The high-resolution Fe 2p XPS spectrum is shown inFig.…”

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confidence: 93%

Cubic imidazolate frameworks-derived CoFe alloy nanoparticles-embedded N-doped graphitic carbon for discharging reaction of Zn-air battery

Wang

et al. 2019

Sci. China Mater.

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The construction of transition metal-based catalysts with high activity and stability has been widely regarded as a promising method to replace the precious metal Pt for oxygen reduction reaction (ORR). Herein, we synthesized CoFe alloy nanoparticle-embedded N-doped graphitic carbon (CoFe/NC) nanostructures as ORR electrocatalysts. The ZIF-67 (zeolitic imidazolate framework, ZIF) nanocubes were first synthesized, followed by an introduction of Fe 2+ ions to form CoFe-ZIF precursors via a simple ion-exchange route. Subsequently, the CoFe/NC composites were synthesized through a facile pyrolysis strategy. The ORR activity and the contents of cobalt and iron could be effectively adjusted by controlling the solution concentration of Fe 2+ ions used for the ion exchange and the pyrolysis temperature. The CoFe/NC-0.2-900 composite (synthesized with 0.2 mmol of FeSO 4 •7H 2 O at a pyrolysis temperature of 900°C) exhibited ORR activity that was superior to the other samples owing to a synergistic effect of the bimetal, especially considering the extremely high limiting current density of 6.4 mA cm-2 compared with that of Pt/C (5.1 mA cm-2). Rechargeable Zn-air batteries were assembled employing CoFe/NC-0.2-900 and NiFeP/NF (NiFeP supported on nickel foam (NF)) as the catalysts for the discharging and charging processes, respectively, The above materials achieved reduced discharging and charging platforms, high power density, and prolonged cycling stability compared with conventional Pt/C+RuO 2 /C catalysts.

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“…High-valence state Co could provide evidence of Co-N, further indicating the interaction between Co and N[43]. The high-resolution Fe 2p XPS spectrum is shown inFig.…”

mentioning

confidence: 93%

Cubic imidazolate frameworks-derived CoFe alloy nanoparticles-embedded N-doped graphitic carbon for discharging reaction of Zn-air battery

Wang

et al. 2019

Sci. China Mater.

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“…To explore optimal approaches to produce highly stable and active catalysts with the M-N x C structure, lots of efforts have been devoted to exploring the synthesis strategies and the nature of the catalytic active sites [42][43][44][45][46][47][48][49]. This section reviews the research progress in transition metal catalysts supported on nitrogen-doped carbon with its emphasis on the choice of carbon sources and nitrogen sources, the control of experimental conditions, and the analysis of catalytic sites.…”

Section: Previous M-n X C Catalystsmentioning

confidence: 99%

Recent Advances in Non-Precious Transition Metal/Nitrogen-doped Carbon for Oxygen Reduction Electrocatalysts in PEMFCs

Song

Sha

et al. 2020

Catalysts

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The proton exchange membrane fuel cells (PEMFCs) have been considered as promising future energy conversion devices, and have attracted immense scientific attention due to their high efficiency and environmental friendliness. Nevertheless, the practical application of PEMFCs has been seriously restricted by high cost, low earth abundance and the poor poisoning tolerance of the precious Pt-based oxygen reduction reaction (ORR) catalysts. Noble-metal-free transition metal/nitrogen-doped carbon (M–NxC) catalysts have been proven as one of the most promising substitutes for precious metal catalysts, due to their low costs and high catalytic performance. In this review, we summarize the development of M–NxC catalysts, including the previous non-pyrolyzed and pyrolyzed transition metal macrocyclic compounds, and recent developed M–NxC catalysts, among which the Fe–NxC and Co–NxC catalysts have gained our special attention. The possible catalytic active sites of M–NxC catalysts towards the ORR are also analyzed here. This review aims to provide some guidelines towards the design and structural regulation of non-precious M–NxC catalysts via identifying real active sites, and thus, enhancing their ORR electrocatalytic performance.

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“…The sharp peak at 284.3 eV corresponds to CC bond (i.e., sp 2 carbon). Meanwhile, the other peaks arising at higher binding energies (285.0, 288.2, 290.2, and 291.7 eV) were also observed, which could be assigned to CH, CN, CO and shake‐up satellite due to π–π* transition in aromatic rings . Figure h shows the high‐resolution N 1s spectrum of the N/S‐HCNs sample.…”

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confidence: 92%

Hollow Carbon Nanobelts Codoped with Nitrogen and Sulfur via a Self‐Templated Method for a High‐Performance Sodium‐Ion Capacitor

Cui

Wang

et al. 2019

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conventional batteries. [8][9][10][11][12] However, it is still a big challenge to develop a hybrid device possessing both energy density comparable to lithium-ion batteries and power density and cycling stability comparable to EDLC.Meanwhile, the ever-growing consumption of lithium resources driven by the fast development of portable electronic devices and electric vehicles will eventually lead to a considerable gap between the demand and lithium-based devices, because that the lithium reserves on the earth are quite limited. [13][14][15][16][17] Alternatively, the sodium-ion based energy storage devices, especially hybrid supercapacitors were considered as promising alternatives to lithium-ion based electrochemical devices due to its abundant storage. [17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] In the past years, several sodium-ion based hybrid supercapacitors have been developed with different configurations. [33][34][35][36][37][38][39][40][41][42][43][44][45] For example, Yamada and co-workers reported a high-performance sodium-ion capacitor using Ti 2 CT x as anode and Na 2 Fe 2 (SO 4 ) 3 as the cathode, [46] and the device demonstrated high rate capacities of 90 and 40 mAh g −1 at 1.0 and 5.0 A g −1 , respectively, good cycling stability of 96% capacity retention after 100 cycles at 0.6 A g −1 , high energy density of 260 Wh kg −1 at 1.4 kW kg −1 (based on the weight of Ti 2 CT x anode). Yu and co-workers reported a flexible quasi-solid-state sodium-ion capacitor using urchinlike Na 2 Ti 3 O 7 anode, peanut shell derived carbon cathode, and sodium ion conducting gel polymer electrolyte. [47] This SIC exhibited superior electrochemical performance including high energy density of 111.2 Wh kg −1 at 800 W kg −1 (calculated on the total mass of both electrodes), and long cycling stability with 86% capacity retention after 3000 cycles. However, there is still much room to improve the energy densities of sodium-ion capacitors (SICs) to meet with the application requirements.Involving the pseudocapacitance reaction to the EDLC electrode is a possible strategy to further improve the energy density of hybrid supercapacitors because the pseudocapacitance reaction features the abilities to achieve additional capacity than Helmholtz double layer adsorption reaction and meanwhile keep fast reaction kinetics, which has been previously utilized in hybrid capacitors. [48][49][50][51][52][53][54] Herein, we reported a novel SIC based on N and S codoped hollow carbon nanobelts (N/S-HCNs) cathode and tin foil anode in a carbonate Sodium-ion capacitors (SICs) have attracted enormous attention due to their high energy density and high power density. In this work, N and S codoped hollow carbon nanobelts (N/S-HCNs) are synthesized by a self-templated method. The as-synthesized carbon nanobelts exhibit excellent performance in pseudocapacitance and electric double layer anions adsorption. After pairing the N/S-HCNs cathode with a tin foil anode in a carbonate electrolyte, the obtained SIC achieves a high spec...

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Sustainable Synthesis of Co@NC Core Shell Nanostructures from Metal Organic Frameworks via Mechanochemical Coordination Self‐Assembly: An Efficient Electrocatalyst for Oxygen Reduction Reaction

Cited by 160 publications

References 60 publications

Cubic imidazolate frameworks-derived CoFe alloy nanoparticles-embedded N-doped graphitic carbon for discharging reaction of Zn-air battery

Cubic imidazolate frameworks-derived CoFe alloy nanoparticles-embedded N-doped graphitic carbon for discharging reaction of Zn-air battery

Recent Advances in Non-Precious Transition Metal/Nitrogen-doped Carbon for Oxygen Reduction Electrocatalysts in PEMFCs

Hollow Carbon Nanobelts Codoped with Nitrogen and Sulfur via a Self‐Templated Method for a High‐Performance Sodium‐Ion Capacitor

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