Novel hierarchically porous Ti-MOFs/nitrogen-doped graphene nanocomposite served as high efficient oxygen reduction reaction catalyst for fuel cells application

Qin, Xiulan; Zhang, Shuai; Wang, Ke; Xu, Tingting; Wang, Yanli; Liu, Panbo; Kang, Yuan; Zhang, Yang

doi:10.1016/j.electacta.2018.12.045

Cited by 55 publications

(31 citation statements)

References 65 publications

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“…50,52 Number n of the HCN-FNFCG-650 was calculated to be approximately 3.84, seen in Figure 9C, near to the theoretical calculation value of 4.0. 50,52 Number n of the HCN-FNFCG-650 was calculated to be approximately 3.84, seen in Figure 9C, near to the theoretical calculation value of 4.0.…”

Section: Resultssupporting

confidence: 55%

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Template‐free synthesis of novel hollow carbon nanospheres with dual active sites as catalyst for fuel cell cathode to improve oxygen reduction reaction performances

et al. 2019

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Summary A new template‐free controlled method is reported herein to prepare the novel hollow carbon nanospheres with dual active sites of FeN4 and FeC3 by in situ growth reaction on graphene nanosheets, labeled as HCN‐FNFCG. As‐prepared HCN‐FNFCG nanomaterials possess hierarchically porous FeN4/FeC3 shells with structures of microporous, mesoporous, and macroporous properties. Moreover, the hierarchically porous HCN‐FNFCG nanomaterials with dual active sites of FeN4 and FeC3 have not been reported before. The HCN‐FNFCG nanomaterials, as oxygen reduction reaction (ORR) catalysts, are first studied systematically toward cathodic ORR of fuel cell. The measurements have illustrated that HCN‐FNFCG‐650 has the best ORR performances among these HCN‐FNFCG nanomaterials studied. The onset potential of HCN‐FNFCG‐650 has reached 1.095 V in alkaline electrolyte, and its maximum current density is 6.48 mA cm−2. Additionally, the HCN‐FNFCG‐650 has also displayed small electrochemical impedance, its Tafel‐slope value is 44.25 mV dec−1, much lower than that of the 20% Pt/C (69.57 mV dec−1). And its value of current density is still maintained 92.83% of the initial value after 9000‐second continuous tests. High tolerance against methanol crossover is also exhibited for HCN‐FNFCG‐650. This novel method of template‐free synthesis can provide a promising strategy for preparing hollow nanospheres with hierarchically porous shells. And it can be used to design ORR electrocatalysts, electrode materials, or other applications.

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Section: Resultssupporting

confidence: 55%

“…Mean pore diameter of HCN-FNFCG-650 is 12.766 nm, higher than those of other HCN-FNFCG samples in Figure 4C and D. The micro-and meso-pores coexisted in all samples. 24,49,50 These two kinds of nitrogen are very important for ORR performance. The ratio of contents for micro-, Abbreviation: XPS, X-ray photoelectron spectroscopy.…”

Section: Resultsmentioning

confidence: 99%

Template‐free synthesis of novel hollow carbon nanospheres with dual active sites as catalyst for fuel cell cathode to improve oxygen reduction reaction performances

et al. 2019

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“…Origin 7.5 software was used for deconvolution of XPS peaks. 70,72 The peaks observed at the binding energies of approximately 284, 286, and 288 eV for the C 1s core level spectra of N-doped G/ITO and in situ N-doped G/ITO could be attributed to C═C, C─N, and C─O, respectively ( Figures 4C and 4f). Figure 4 demonstrates the C 1s, N 1s, and Cu 2p XPS core level spectra for G/ITO, N-doped G/ITO, and in situ N-doped G/ITO.…”

Section: Characterizationmentioning

confidence: 98%

“…Three typical band of graphene were observed for B-doped graphene. The increase in intensity of D band was due to deformations and gaps in the lattice structure of graphene as a result of the boron atoms doping on ITO/graphene, [68][69][70] whereas the decrease of the 2D/G ratio can be attributed to the rise in Fermi level. The intensity of D-band for B-doped graphene at 1353 cm -1 was 4.5 times lower than that of its G band show that the interaction of boron and carbon atoms was very strong.…”

Section: Characterizationmentioning

confidence: 99%

“…It was observed that the D/G ratio increased slightly while 2D/G ratio decreased compared with ITO/graphene (D/G=0.138 and 2D/G=1.387 for ITO/graphene). The increase in intensity of D band was due to deformations and gaps in the lattice structure of graphene as a result of the boron atoms doping on ITO/graphene, [68][69][70] whereas the decrease of the 2D/G ratio can be attributed to the rise in Fermi level. 71 Figure 3B displays the Raman spectra of S-doped ITO/graphene.…”

Section: Characterizationmentioning

confidence: 99%

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Synthesis of in situ N‐, S‐, and B‐doped few‐layer graphene by chemical vapor deposition technique and their superior glucose electrooxidation activity

2019

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Summary At present, N‐, S‐, and B‐doped grapheme‐modified indium tin oxide (ITO) electrodes are produced and doping method effect on the glucose electrooxidation is investigated. Firstly, few‐layer graphene is produced by chemical vapor deposition (CVD) method. Then, N, S, and B doping is carried out after graphene produced by CVD to prepare N‐doped, B‐doped, and S‐doped few‐layer graphene. N, S, and B doping is carried out by two different ways as (a) doping after synthesis of few‐layer graphene and (b) in situ doping during few‐layer graphene production. These materials are characterized by X‐ray diffraction, scanning electron microscopy‐energy (SEM), Raman spectroscopy, and X‐ray photoelectron spectroscopy (XPS). One could note that graphene and nitrogen networks are clearly visible from SEM images. Raman spectra show that B, N, and S are doped on few‐layer graphene/ITO successfully. XPS results of graphene, N‐doped graphene, and in situ N‐doped graphene reveal that graphene and nitrogen atoms used in the preparation of the electrodes obtain mainly in their elemental state. Then, these N‐, S‐, B‐doped and in situ N‐, S‐, B‐doped few‐layer graphene materials are coated onto indium tin oxide (ITO) to obtain N‐, S‐, B‐doped and in situ N‐, S‐, B‐doped ITO electrodes for glucose (C6H12O6) electrooxidation. C6H12O6 electrooxidation measurements are investigated with cyclic voltammetry, chronoamperometry, and electrochemical impedance spectroscopy measurements. As a result, in situ N‐doped few‐layer graphene/ITO electrode displays the best C6H12O6 electrooxidation activity with 9.12 mA.cm−2 current density compared with other N‐, S‐, B‐doped graphene and in situ doped S and B grapheme‐modified ITO electrodes. Furthermore, this current density value for in situ N‐doped few‐layer graphene/ITO is highly above the values reported in the literature. In situ N‐doped few‐layer graphene/ITO electrode is a promising electrode for C6H12O6 electrooxidation because it exhibits the best electrocatalytic activity, stability, and resistance compared with other electrodes.

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Developing metal‐organic framework‐based composite for innovative fuel cell application: An overview

Zaiman

Shaari

Harun

2021

Intl J of Energy Research

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Summary In this work, metal‐organic frameworks (MOFs), known as porous carbon, organic ligands, and crystalline materials have been reviewed as it consists of excellent properties, including high surface area, porosity, functional consistency, and uniform structure. The structural of MOFs, including secondary building units, open metal sites, pore sizes, functional materials, and development of MOF have been extensively studied as it helps to conduct electricity and promising good efficiency. To improve the performance in fuel cell applications, especially in catalytic activity such as oxygen reduction reaction and proton exchange membrane, the combination of MOF and other materials such as MOF/carbon material composites, MOF/metal nanoparticles (NPs), and MOF/biocomposites has been discussed in details, which can increase the potential and efficiency of catalysts. MOF‐derivatives, including MOF‐derived porous carbon, MOF‐derived NPs, MOF‐derived metal oxides, and MOF‐derived metal phosphide, has been provided in this review as it has its advantages; (a) increase the mass density of active sites, (b) increase intrinsic activity of active sites, (c) increase electrocatalyst conductivity (d), and accelerate electron transfer. Hence, it can produce materials with high thermal and chemical stability, embracing metal sites, and efficiency in active sites. These advantages have made the MOF a promising material to increase efficiency in fuel cell application and attract interest to further expand in other fields in the future.

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Novel hierarchically porous Ti-MOFs/nitrogen-doped graphene nanocomposite served as high efficient oxygen reduction reaction catalyst for fuel cells application

Cited by 55 publications

References 65 publications

Template‐free synthesis of novel hollow carbon nanospheres with dual active sites as catalyst for fuel cell cathode to improve oxygen reduction reaction performances

Template‐free synthesis of novel hollow carbon nanospheres with dual active sites as catalyst for fuel cell cathode to improve oxygen reduction reaction performances

Synthesis of in situ N‐, S‐, and B‐doped few‐layer graphene by chemical vapor deposition technique and their superior glucose electrooxidation activity

Developing metal‐organic framework‐based composite for innovative fuel cell application: An overview

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