Template-free and one-pot synthesis of N-doped hollow carbon tube @ hierarchically porous carbon supporting homogeneous AgNPs for robust oxygen reduction catalyst

Cao, Chun; Wei, Liling; Su, Min; Wang, Gang; Shen, Jing

doi:10.1016/j.carbon.2016.10.083

Cited by 43 publications

(19 citation statements)

References 48 publications

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“…1 and 2 the Ag/NGO catalysts had overall the smallest particles with most uniform distribution. The higher mass activity of Ag/NGO catalysts may also be related to synergistic effect between NGO and Ag-particles, and some nitrogen groups make it easier for oxygen molecules to adsorb thus making the reduction of oxygen more efficient [57]. Similar MA values have been reported previously [21,30].…”

Section: Oxygen Reduction Reaction Studiessupporting

confidence: 77%

Oxygen reduction on silver catalysts electrodeposited on various nanocarbon supports

et al. 2021

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In this work, Ag particles were electrodeposited onto nitrogen-doped graphene oxide, graphene, multi-walled carbon nanotube (MWCNT), and Vulcan carbon XC-72R supports by varying the upper potential limit. The surface morphology of the resulting Ag-based catalysts was examined by scanning electron microscopy. The electrochemical oxygen reduction reaction (ORR) was tested in alkaline media employing the rotating disk electrode method. The variation of the upper potential limit influenced the size of silver nanoparticles and their number density on the substrate surface. All the Ag-based electrocatalysts studied in this work showed remarkable ORR activity in terms of half-wave potentials. The ORR results combined with hydrogen peroxide reduction results prove that all Ag catalysts tested are suitable for both reactions. Ag/NGO2 catalyst possesses the highest mass activity for ORR, which indicates a relationship between the Ag loading and electrocatalytic activity. The electroreduction of oxygen on all the electrodeposited silver catalysts follows a four-electron pathway in alkaline environment. These materials are promising alternatives for Pt/C catalyst to be used as alkaline membrane fuel cell cathodes.

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Section: Oxygen Reduction Reaction Studiessupporting

confidence: 77%

Oxygen reduction on silver catalysts electrodeposited on various nanocarbon supports

et al. 2021

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“…Cao et al. described a method to prepare AgNPs supported on a carbon nanomaterial consisting of N‐doped hollow carbon tubes on hierarchically porous carbon by carbonising a precursor mixture at 900 °C . The improved ORR performance over the other carbon‐supported Ag catalysts was attributed to the synergistic catalytic effect between AgNPs and N‐doped carbon support.…”

Section: Orr On Ag Nanoparticles Supported On Nitrogen‐doped Carbon Mmentioning

confidence: 98%

Oxygen Reduction Reaction on Silver Catalysts in Alkaline Media: a Minireview

2018

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The development of efficient platinum‐free catalysts for electrocatalytic oxygen reduction reaction (ORR) is one of the main challenges in the fuel cell research. Silver‐based materials are highly active towards ORR in alkaline conditions and recent achievements in improving the performance of anion exchange membrane fuel cells (AEMFCs) have provoked many scientists to study these catalysts. This minireview is focused on the ORR performance of monometallic Ag catalysts and Ag‐based composites, the electrochemical oxygen reduction behaviour of Ag‐containing alloys is outside the scope of this review. The effect of the morphology of Ag nanostructures on catalysts’ ORR activity and pathway is discussed and the role of the support material is described. The performance of AEMFCs using Ag‐based cathode catalysts is also reviewed.

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“…However, when only metal nanoparticles exist, inevitable oxidation, corrosion, and agglomeration of nanoparticles in the electrolyte will result in the loss of catalytic activity and have a short lifetime. It has been proved to be an efficacious method to disperse highly active metal nanoparticles on relatively stable carbon materials, which can avoid agglomeration of nanoparticles, increase the effective contact between the catalyst and electrolyte, and improve the availability of active substances. − Nevertheless, the previous methods, such as dispersing metal nanoparticles on graphene sheets or carbon tubes, − often suffer from peeling off of nanoparticles in the electrochemical test due to the weak adhesion between metal species and the carbon matrix. Coating metal nanoparticles with a carbon layer is an effective way to solve the above problems. , Fan et al reported that transition-metal carbide encapsulated in graphitic shells, which was prepared through a hot filament chemical vapor deposition method, showed enhanced stability .…”

Section: Introductionmentioning

confidence: 99%

3D Honeycomb Nanostructure Comprised of Mesoporous N-Doped Carbon Nanosheets Encapsulating Isolated Cobalt and Vanadium Nitride Nanoparticles as a Highly Efficient Electrocatalyst for the Oxygen Reduction Reaction

Wang

Liu

et al. 2020

ACS Sustainable Chem. Eng.

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The development of high-efficiency non-noble metal catalysts for the oxygen reduction reaction (ORR) is of paramount significance to sustainable energy-conversion technologies. Herein, a three-dimensional (3D) honeycomb nanostructure comprised of mesoporous N-doped carbon nanosheets encapsulating isolated cobalt and vanadium nitride nanoparticles (denoted Co−VN−NC) is synthesized through a facile one-step pyrolysis method. The catalyst prepared under optimal temperature exhibits excellent ORR performance with an E onset of 0.032 V and an E 1/2 of −0.086 V (vs Ag/AgCl) in 0.1 M KOH solution, which is very close to that of commercial 20% Pt/C, and it also shows better ORR performance in 0.5 M H 2 SO 4 solution. Moreover, it demonstrates a superior enhanced tolerance to methanol poisoning compared with that of Pt/C. More importantly, the optimized catalyst shows extraordinary stability with a little current decline of less than 4 and 8% during chronoamperometric evaluation for more than 30 000 s in alkaline and acidic solutions, respectively. It has been proved that the catalyst favors an efficient four-electron pathway-dominated ORR process. The excellent performance can be ascribed to the 3D honeycomb nanostructure with a number of mesopores, which possesses high specific surface area (433.20 m 2 g −1 ) conducive to the high exposure level of the active sites, the efficient electron-transfer capability between different metal nanoparticles, and a powerful protective effect of the N-doped carbon layer. This work not only provides great potential non-noble metal ORR electrocatalysts comparable to Pt/C but also puts forward a simple and scalable pyrolysis method to prepare nonprecious metal catalysts.

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Template-free and one-pot synthesis of N-doped hollow carbon tube @ hierarchically porous carbon supporting homogeneous AgNPs for robust oxygen reduction catalyst

Cited by 43 publications

References 48 publications

Oxygen reduction on silver catalysts electrodeposited on various nanocarbon supports

Oxygen reduction on silver catalysts electrodeposited on various nanocarbon supports

Oxygen Reduction Reaction on Silver Catalysts in Alkaline Media: a Minireview

3D Honeycomb Nanostructure Comprised of Mesoporous N-Doped Carbon Nanosheets Encapsulating Isolated Cobalt and Vanadium Nitride Nanoparticles as a Highly Efficient Electrocatalyst for the Oxygen Reduction Reaction

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