Graphene Oxide Sheathed ZIF-8 Microcrystals: Engineered Precursors of Nitrogen-Doped Porous Carbon for Efficient Oxygen Reduction Reaction (ORR) Electrocatalysis

Thomas, Minju; Illathvalappil, Rajith; Kurungot, Sreekumar; Nair, Balagopal N.; Mohamed, Abdul Azeez Peer; Anilkumar, Gopinathan M.; Yamaguchi, Takeo; Hareesh, U. S.

doi:10.1021/acsami.6b06979

Cited by 149 publications

(90 citation statements)

References 52 publications

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“…According to the EDXS spectrum (Figure ), the internal area consists mostly of cobalt and zinc, with additional signals for carbon and nitrogen. It can be seen that the prepared porous Zn/Co@C material is doped with zinc and nitrogen after coating with ZIF‐8, which can be confirmed by some of the previous reports . These results further confirm that the N‐doped magnetic porous Zn/Co@C composites were synthesized.…”

Section: Resultssupporting

confidence: 87%

Magnetic Nanocomposites Derived from Hollow ZIF‐67 and Core‐Shell ZIF‐67@ZIF‐8: Synthesis, Properties, and Adsorption of Rhodamine B

2017

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Two types of magnetic nanocomposites, Co‐carbon composite (Co@C) and Zn/Co‐carbon composite (Zn/Co@C), were synthesized by one‐step calcinations of hollow Co‐ZIF (ZIF‐67) and Zn/Co‐ZIF (ZIF‐67@ZIF‐8) (ZIF = zeolitic imidazolate framework), as well as applied as adsorbents in the reduction of Rhodamine B (RhB). The prepared composites were carefully analyzed by SEM, TEM‐EDXS (EDXS = energy‐dispersive X‐ray specroscopy), XRD, SQUID, and nitrogen adsorption/desorption measurements. Co@C and Zn/Co@C showed the maximum adsorption capacities of 48 mg g–1 and 101.93 mg g–1, respectively, toward RhB. The adsorption isotherms of RhB on the Zn/Co@C nanocomposites were well fitted with the Langmuir model, and the pseudo‐second‐order model accurately describes the adsorption kinetic process for the adsorption of RhB on the materials. The results show that the composite materials of Zn/Co@C possess higher porosity and magnetic properties and exhibit higher adsorption capacity, convenient separation ability, along with good reusability of the adsorbent. The theoretical calculations also clarify that RhB on the distorted Co–Zn surface is much more stable than that on Co(111), in good agreement with the experimental observations.

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Section: Resultssupporting

confidence: 87%

Magnetic Nanocomposites Derived from Hollow ZIF‐67 and Core‐Shell ZIF‐67@ZIF‐8: Synthesis, Properties, and Adsorption of Rhodamine B

2017

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“…The first one is the oxidation process, in which the carbon matrix lose defects and edges . The other one is leaking of the pyridinic N species in acid treatment . All of them would sharply decrease the ORR performance of catalyst after acid treatment.…”

Section: Resultsmentioning

confidence: 99%

Restructured Fe−Mn Alloys Encapsulated by N‐doped Carbon Nanotube Catalysts Derived from Bimetallic MOF for Enhanced Oxygen Reduction Reaction

et al. 2018

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A set of novel catalysts FeMn/N‐CNTs that partly maintain the core‐shell structure have been prepared successfully by calcination of analogous MOF‐74, which has bimetallic species (Fe and Mn) and a cheap organic ligand (2, 5‐dihydroxylbenzoic acid, DHBA) with melamine as additional nitrogen source. These catalysts exhibit a distinctive microstructure of Fe−Mn alloys surrounded by N‐doped carbon nanotubes (CNTs). Electrochemical methods have been employed to investigate their activity in oxygen reduction reaction (ORR) in alkaline solution. The highest ORR performance of Fe3Mn1/N‐CNTs‐100 shows that the half wave potential is at 0.865 V and the kinetic current density (at 0.9 V) is 1.447 mA cm−2, which are higher than those of commercial Pt/C (0.855 V, 0.946 mA cm−2). In addition, Fe3Mn1/N‐CNTs‐100 is much more durable than commercial Pt/C under the conditions tested. The highly efficient ORR performance may be attributed to the unique microstructure and large surface area with appropriate pore size, as well as to the synergistic effects between the pyridinic N species and the Fe−Nx species that play important roles in ORR in alkaline solution. However, in acid medium, only Fe−Nx species catalyze ORR and pyridinic N species are limited to work as the active sites. This study may prompt others to explore the development of heteroatom‐doped CNTs surrounding particles as efficient catalyst for ORR and fuel cell applications.

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“…Figure 6A, B displays the three typical peaks, which binding energies are 284.3 (C 1s), 530.0 (O 1s), and 191.0 (B 1s) eV. [54] The X-ray photoelectron spectroscopy bight of Pd/ BC-2 and BC-2 is charted in Figure 6A. [54] The X-ray photoelectron spectroscopy bight of Pd/ BC-2 and BC-2 is charted in Figure 6A.…”

Section: Structure and Morphologymentioning

confidence: 99%

Palladium Nanoparticles Supported on B‐Doped Carbon Nanocage as Electrocatalyst toward Ethanol Oxidation Reaction

Yao

Zhang

et al. 2019

ChemElectroChem

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Boron-doped carbon nanocage (BC-2) was used as carrier to anchor palladium nanoparticles and enhanced the catalytic performance for the ethanol oxidation reaction. The BC-2 was synthesized via thermal treatment the predesigned compound containing cobalt and boron at 900°C with the help of hydrogen and acid washing process. Palladium nanoparticles can be loaded on the BC-2 supports (Pd/BC-2) for ethanol oxide reaction (EOR). The BC-2 support has the following character-istics: (i) The hollow structure contains highly order nanoporous to offer more channel and space in catalysis process; (ii) borondoped carbon structures can supply abundant activity sites for stabilizing palladium nanoparticles; (iii) the unique three-dimensional architecture can prevent the agglomeration and inactivation of metal catalysts. The Pd/BC-2 catalyst displays higher catalytic activities 3614.11 mA mg À 1 toward the peak current density compared to that of Pd/C (804.39 mA mg À 1 ).

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Graphene Oxide Sheathed ZIF-8 Microcrystals: Engineered Precursors of Nitrogen-Doped Porous Carbon for Efficient Oxygen Reduction Reaction (ORR) Electrocatalysis

Cited by 149 publications

References 52 publications

Magnetic Nanocomposites Derived from Hollow ZIF‐67 and Core‐Shell ZIF‐67@ZIF‐8: Synthesis, Properties, and Adsorption of Rhodamine B

Magnetic Nanocomposites Derived from Hollow ZIF‐67 and Core‐Shell ZIF‐67@ZIF‐8: Synthesis, Properties, and Adsorption of Rhodamine B

Restructured Fe−Mn Alloys Encapsulated by N‐doped Carbon Nanotube Catalysts Derived from Bimetallic MOF for Enhanced Oxygen Reduction Reaction

Palladium Nanoparticles Supported on B‐Doped Carbon Nanocage as Electrocatalyst toward Ethanol Oxidation Reaction

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