ZIF-67-derived Co nanoparticles anchored in N doped hollow carbon nanofibers as bifunctional oxygen electrocatalysts

Wei, Peng; Yang, Xiaoxiao; Mao, Linchang; Jin, Junhong; Yang, Shengrong; Zhang, Jingjing

doi:10.1016/j.cej.2020.127157

Cited by 112 publications

(56 citation statements)

References 52 publications

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“…S8, two prominent peaks at 1338 and 1589 cm −1 were assigned to D-band and G-band, respectively, which were characteristic Raman peaks of defective carbon and graphitic carbon [37,38]. Considering the incorporation of N elements into 2-methylimidazole, the N-doped C matrix was obtained after pyrolysis treatment [39,40]. From the aforementioned characterization results, it could be concluded that Co NPs were distributed on the N-doped C matrix after the pyrolysis of ZIF-67 nanocubes.…”

Section: Resultsmentioning

confidence: 99%

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Controlling metallic Co0 in ZIF-67-derived N-C/Co composite catalysts for efficient photocatalytic CO2 reduction

Chen

Feng

et al. 2021

Sci. China Mater.

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An efficient photocatalytic CO 2 reduction has been reported in ZIF-67-derived-Co nanoparticles (NPs) encapsulated in nitrogen-doped carbon layers (N-C/Co). This work demonstrates that the pyrolysis temperature is crucial in tuning the grain size and components of metallic Co 0 of N-C/ Co composite catalysts, which optimizes their photocatalytic activities. Syntheses were conducted at 600, 700, and 800°C giving the N-C/Co-600, N-C/Co-700, and N-C/Co-800 samples, respectively. N-C layers can well wrap the Co NPs obtained at a low pyrolysis temperature (600°C) owing to their smaller grains than those of other samples. A high metallic Co 0 content in the N-C/Co-600 sample can be attributed to the effective inhibition of surface oxidation. By contrast, the surface CoO x oxides in the N-C/Co-700 and N-C/Co-800 samples cover inside Co cores, inhibiting charge separation and transfer. As a result, the N-C/Co-600 sample yields the best photocatalytic activity. The carbon monoxide and hydrogen generation rates are as high as 1.62 × 10 4 and 2.01 × 10 4 µmol g −1 h −1 , respectively. Additionally, the Co NPs make composite catalysts magnetic, enabling rapid and facile recovery of catalysts with the assistance of an external magnetic field. This work is expected to provide an instructive guideline for designing metal-organic framework-derived carbon/metal composite catalysts.

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Section: Resultsmentioning

confidence: 99%

“…The HRXPS spectrum of C 1s was composed of C-C/C=C, C-N, and C-O [34,37,40], as shown in Fig 4b . The existence of the C-N bond manifested the doping of nitrogen in the carbon matrix. The surface-N contents in the N-C/Co samples were first determined from XPS spectra.…”

Section: Articles Science China Materialsmentioning

confidence: 99%

Controlling metallic Co0 in ZIF-67-derived N-C/Co composite catalysts for efficient photocatalytic CO2 reduction

Chen

Feng

et al. 2021

Sci. China Mater.

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“…In addition to the M-Nx sites, the pyridinic-N, pyrrolic-N and graphitic-N species were also observed in the N1s spectra. Both, pyridinic-N and graphitic-N are generally recognised to contribute to the high ORR activity of CNFs [6,12,[47][48][49]. In more specific, the pyridinic-N has been found to improve the ORR onset potential [16], while the graphitic-N provides higher ORR current density through increased electrical conductivity [14,31].…”

Section: Aemfc Testingmentioning

confidence: 99%

Iron and cobalt containing electrospun carbon nanofibre-based cathode catalysts for anion exchange membrane fuel cell

Sokka

Mooste

Käärik

et al. 2021

International Journal of Hydrogen Energy

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The use of Pt-based cathode catalyst materials hinders the widespread application of anion exchange membrane fuel cells (AEMFCs). Herein, we present a non-precious metal catalyst (NPMC) material based on pyrolysed Fe and Co co-doped electrospun carbon nanofibres (CNFs). The prepared materials are studied as oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) catalysts in alkaline and acidic environments. High activity towards the ORR in alkaline solution indicated the suitability of the prepared NPMCs for the application at the AEMFC cathode. In the AEMFC test, the membrane-electrode assembly bearing a cathode with the nanofibre-based catalyst prepared with the ionic liquid (IL) (Fe/Co/IL-CNF-800b) showed the maximum power density (Pmax) of 195 mW cm −2 , which is 78 % of the Pmax obtained with a commercial Pt/C cathode catalyst. Such high ORR

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“…Transition metal carbides, such as molybdenum carbides, have been identified as a class of promising catalysts for hydrogen evolution due to their similar electronic properties and catalytic behavior to Pt-group metals . ZIF-67 derived Co-embedded NC materials have been frequently demonstrated as an efficient electrocatalyst for the OER and ORR . Therefore, the rational fabrication of Co/MoC heterostructures electrocatalysts may simultaneously enhance the OER, HER, and ORR activities, thereby satisfying the practical application needs of metal–air battery and EOWS.…”

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confidence: 99%

Co/MoC Nanoparticles Embedded in Carbon Nanoboxes as Robust Trifunctional Electrocatalysts for a Zn–Air Battery and Water Electrocatalysis

et al. 2021

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To meet the application needs of rechargeable Zn−air battery and electrocatalytic overall water splitting (EOWS), developing high-efficiency, cost-effective, and durable trifunctional catalysts for the hydrogen evolution reaction (HER), oxygen evolution, and reduction reaction (OER and ORR) is extremely paramount yet challenging. Herein, the interface engineering concept and nanoscale hollowing design were proposed to fabricate N-doping carbon nanoboxes confined with Co/MoC nanoparticles. Uniform zeolitic imidazolate framework nanocube was employed as the starting material to construct the trifunctional electrocatalyst through the conformal polydopamine−Mo layer coating and the subsequent pyrolysis treatment. The Co@IC/MoC@PC catalyst displayed superior electrochemical ORR performances with a positive half-wave potential of 0.875 V and a high limiting current density of 5.89 mA/cm 2 . When practically employed as an electrocatalyst in regenerative Zn−air battery, a high specific capacity of 728 mAh/g, a large peak power density of 221 mW/cm 2 , a high open-circuit voltage of 1.482 V, and a low charge/discharge voltage gap of 0.41 V were obtained. Moreover, its practicability was further exploited by overall water splitting, affording low overpotentials of 277 and 68 mV at 10 mA/cm 2 for the OER and HER in 1 M KOH solution, respectively, and a decent operating potential of 1.57 V for EOWS. Ultraviolet photoelectron spectroscopy and density functional theory calculation revealed that the Co/MoC interface synergistically facilitated the charge-transfer, thereby contributing to the enhancements of electrocatalytic ORR/OER/HER processes. More importantly, this catalyst design concept can offer some interesting prospects for the construction of outstanding trifunctional catalysts toward various energy conversion and storage devices.

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ZIF-67-derived Co nanoparticles anchored in N doped hollow carbon nanofibers as bifunctional oxygen electrocatalysts

Cited by 112 publications

References 52 publications

Controlling metallic Co0 in ZIF-67-derived N-C/Co composite catalysts for efficient photocatalytic CO2 reduction

Controlling metallic Co0 in ZIF-67-derived N-C/Co composite catalysts for efficient photocatalytic CO2 reduction

Iron and cobalt containing electrospun carbon nanofibre-based cathode catalysts for anion exchange membrane fuel cell

Co/MoC Nanoparticles Embedded in Carbon Nanoboxes as Robust Trifunctional Electrocatalysts for a Zn–Air Battery and Water Electrocatalysis

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