Production of B-doped reduced graphene oxide using wet-process in tetrahydrofuran

Shin, Yunseok; Park, Sunghee

doi:10.1007/s42823-020-00192-4

Cited by 10 publications

(7 citation statements)

References 21 publications

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“…The Raman analysis of Co@C‐800 provides insights into the properties of its carbon shells (Figure 3c). As shown in Figure 3c, the spectrum of Co@C‐800 exhibits two peaks at 1342 and 1580 cm −1 , corresponding to the D and G bands, respectively 25 . The presence of the G‐band is indicative of sp 2 ‐hybridized carbon‐based structures within Co@C‐800.…”

Section: Resultsmentioning

confidence: 91%

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One pot production of Co core/carbon shell materials and their electrocatalytic properties

Shin,

Park

2023

Bulletin Korean Chem Soc

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The oxygen reduction reaction (ORR) is a kinetically sluggish reaction because it requires the transfer of four electrons. In this work, one‐pot process involving thermal treatment of Co(II) acetylacetonate is developed. The resulting core–shell material (Co@C‐800) consists of metallic Co cores encapsulated by carbon‐based layered shells. Morphological analysis reveals the core–shell structures, with core particles surrounded by carbon networks. Chemical characterization using various spectroscopic techniques indicates the presence of metallic Co as the major component in Co@C‐800, with minor Co species exhibiting higher oxidation states. Raman spectroscopy confirms the formation of sp2‐hybridized carbon shells. Co@C‐800 displays efficient electrocatalytic ORR performance, evidenced by high onset and half‐wave potentials. The excellent durability and stability of Co@C‐800, demonstrated through resistance to methanol poisoning and cyclic testing, suggest the potential of core–shell materials as a practical electrocatalyst.

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Section: Resultsmentioning

confidence: 91%

“…As shown in Figure 3c, the spectrum of Co@C-800 exhibits two peaks at 1342 and 1580 cm À1 , corresponding to the D and G bands, respectively. 25 The presence of the G-band is indicative of sp 2 -hybridized carbon-based structures within Co@C-800. On the other hand, the D band originates from lattice defects in the sp 2 networks.…”

Section: Resultsmentioning

confidence: 99%

One pot production of Co core/carbon shell materials and their electrocatalytic properties

Shin,

Park

2023

Bulletin Korean Chem Soc

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“…Some studies show that the peaks of B 1s comes from BCO 2 33,34 and BC 2 O 34,35 species. Moreover, these bonds show that boron atoms replaced carbon ones within the graphene network and boron atoms doped at the defect sites 36,37 . However, it should be noted that the presence of BC 3 in the appropriate band energy can also be found in boron‐doped materials 38,39 …”

Section: Resultsmentioning

confidence: 99%

Carbon black‐heteroatom‐doped graphene aerogel hybrid supported platinum nanoparticles as electrocatalysts for oxidation of methanol and formic acid

Çögenli

Yurtcan

2022

Intl J of Energy Research

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Summary Supported catalysts are generally used for electrochemical reactions in fuel cells. Due to their superior properties in these reactions, platinum nanoparticles are preferred over carbon‐structured support materials. Commercial carbon support material such as carbon black (Vulcan XC‐72) is widely used alone for the deposition of platinum particles on the surface. But this support material when used alone is easily affected from the operating conditions of methanol and formic acid oxidation resulting from chemical reaction. Graphene aerogels (GA) are the graphene‐based materials that are important discoveries in nanotechnology, recently. These materials are being investigated as support materials in fuel cell catalysts. In this study, carbon black was used together with GA and heteroatom‐doped GA, as support materials. Three different hybrid carbon (50:50) supported Pt nanoparticles, namely, Pt/GA‐C (carbon black and GA), Pt/NGA‐C (carbon black‐ and nitrogen‐doped GA), and Pt/BGA‐C (carbon black‐ and boron‐doped GA) were synthesized by using, first, the modified Hummers method, second, hydrothermal treatment for support materials, and microwave irradiation method for Pt nanoparticles formation on support materials. The hybrid supported catalysts were characterized using scanning electron microscope, energy dispersion spectroscopy, BET, X‐ray diffractometer, transmission electron microscope, Raman, X‐ray photoelectron spectroscopy, inductively coupled plasma mass spectrometry. The catalysts analysis was studied using cyclic voltammetry, impedance, and short‐term durability. The Pt/BGA‐C catalyst showed the highest catalytic activity for both formic acid and methanol oxidation.

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“…0.8 V), indicating the substantial increase in the availability of ORR active sites due to the presence of the high proportion of P atoms with the help of B atoms. The higher limiting current density for the two-step synthesized RGO can be explained by the well-known catalytic graphitization function of the B atoms with regard to carbon materials [37,38]. As a reference, we obtained the LSV curves for B-doped and N, P codoped RGOs (Figures S7 and S8).…”

Section: Resultsmentioning

confidence: 99%

Importance of Doping Sequence in Multiple Heteroatom-Doped Reduced Graphene Oxide as Efficient Oxygen Reduction Reaction Electrocatalysts

et al. 2021

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Multiple heteroatom-doped graphene is of great interest for developing an efficient electrocatalyst for oxygen reduction reaction (ORR). To maximize the electrocatalytic performance of doped graphene, the competitive doping mechanism caused by the different atomic sizes of dopants should be developed. Herein, three different heteroatoms (e.g., N, P and B) are competitively introduced into reduced graphene oxide (RGO) using both single- and two-step processes. The total quantity of heteroatoms for ternary RGO synthesized using the two-step process is lower than that when using the single-step process. Higher ORR electrocatalytic activity for the two-step-synthesized RGO compared to the single-step-synthesized RGO can be explained by: (a) a high amount of P atoms; (b) the fact that B doping itself decreases the less electrocatalytic N moieties such as pyrrole and pyridine and increases the high electrocatalytic moieties such as quaternary N; (c) a high amount of B atoms itself within the RGO act as an electrocatalytic active center for O2 adsorption; and (d) a small amount of substitutional B might increase the electrical conductivity of RGO. Our findings provide new insights into the design of heteroatom-doped carbon materials with excellent electrocatalytic performance.

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Production of B-doped reduced graphene oxide using wet-process in tetrahydrofuran

Cited by 10 publications

References 21 publications

One pot production of Co core/carbon shell materials and their electrocatalytic properties

One pot production of Co core/carbon shell materials and their electrocatalytic properties

Carbon black‐heteroatom‐doped graphene aerogel hybrid supported platinum nanoparticles as electrocatalysts for oxidation of methanol and formic acid

Importance of Doping Sequence in Multiple Heteroatom-Doped Reduced Graphene Oxide as Efficient Oxygen Reduction Reaction Electrocatalysts

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