Engineering three-dimensional nitrogen-doped carbon black embedding nitrogen-doped graphene anchoring ultrafine surface-clean Pd nanoparticles as efficient ethanol oxidation electrocatalyst

Li, Shuwen; Shu, Junhao; Ma, Sizhuo; Yang, Honglei; Jin, Jun; Zhang, Xinhao; Jin, Ruifa

doi:10.1016/j.apcatb.2020.119464

Cited by 97 publications

(42 citation statements)

References 47 publications

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“…The magnitude of the backward peak is less than that of the forward peak in an alkaline medium. This is because the removal of adsorbed carbonaceous species is easier due to the availability of oxygen-containing species that facilitate quick ethanol oxidation [ 58 , 59 , 60 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Sn Doping on Pd Electro-Catalysts for Enhanced Electro-Catalytic Activity towards Methanol and Ethanol Electro-Oxidation in Direct Alcohol Fuel Cells

et al. 2021

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Carbon nano-onions (CNOs) were successfully synthesized by employing the flame pyrolysis (FP) method, using flaxseed oil as a carbon source. The alcohol reduction method was used to prepare Pd/CNOs and Pd-Sn/CNOs electro-catalysts, with ethylene glycol as the solvent and reduction agent. The metal-nanoparticles were supported on the CNO surface without adjusting the pH of the solution. High-resolution transmission electron microscopy (HRTEM) images reveal CNOs with concentric graphite ring morphology, and also PdSn nanoparticles supported on the CNOs. X-ray diffractometry (XRD) patterns confirm that CNOs are amorphous and show the characteristic diffraction peaks of Pd. There is a shifting of Pd diffraction peaks to lower angles upon the addition of Sn compared to Pd/CNOs. X-ray photoelectron spectroscopy (XPS) results also confirm the doping of Pd with Sn to form a PdSn alloy. Fourier transform infrared spectroscopy (FTIR) displays oxygen, hydroxyl, carboxyl, and carbonyl, which facilitates the dispersion of Pd and Sn nanoparticles. Raman spectrum displays two prominent peaks of carbonaceous materials which correspond to the D and G bands. The Pd-Sn/CNOs electro-catalyst demonstrates improved electro-oxidation of methanol and ethanol performance compared to Pd/CNOs and commercial Pd/C electro-catalysts under alkaline conditions.

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Section: Resultsmentioning

confidence: 99%

Effect of Sn Doping on Pd Electro-Catalysts for Enhanced Electro-Catalytic Activity towards Methanol and Ethanol Electro-Oxidation in Direct Alcohol Fuel Cells

et al. 2021

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“…The Tafel slopes of the four catalysts for EOR are shown in Figure d, which reflects that the EOR with the L-Pd aerogel is more kinetic. Although the hydrogen intermediates (H ad ), which cause Pd poisoning, are not involved in the ethanol electrooxidation process, a large amount of CO is usually generated, which also can poison the catalyst and decrease stability. , To explore the stability of the L-Pd aerogel for the EOR, the CA tests of two catalysts for 3600 s were performed, as shown in Figure e. The activity of the Pd/C electrocatalyst declined rapidly within several seconds and only kept 16.0% of the initial activity at last, while the L-Pd aerogel preserved 32.6% of the initial activity.…”

Section: Resultsmentioning

confidence: 99%

Laser-Assisted Synthesis of Pd Aerogel with Compressive Strain for Boosting Formate and Ethanol Electrooxidation

Zhang

Zhu

Liu

et al. 2021

ACS Sustainable Chem. Eng.

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Owing to the increasing energy demands, direct small-molecule fuel cells, such as ethanol and formate fuel cells, have attracted great attention. During the operation of the fuel cell, noble metal catalysts are widely used to accelerate the reaction kinetics by alloying with other materials. However, there are a few facile methods for improving elemental metal catalytic activity. In this work, the defect-rich palladium (Pd) aerogels are acquired by laser ablating technology, which can significantly improve the intrinsic activity of Pd elementary catalysts through introducing defects and lattice strain. The electrochemical results show that the mass and specific activities of the obtained Pd aerogel for the formate oxidation reaction are 2.26 and 1.99 times higher than those of the commercial Pd/C. The excellent activity and stability of the Pd aerogel for ethanol oxidation reaction have also been demonstrated. The effect of the compressive strain is further investigated by density functional theory (DFT) calculations. It has been found that the compressive strain weakens the adsorption strength of the intermediates, which can facilitate the desorption of toxic specifics. The laser-assisted synthesis of defect-rich aerogel paves a way in optimizing the structure of the elemental metal catalysts and improving their intrinsic catalytic activity.

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“…To prevent GO stacking due to loss of oxygen-containing functional groups, Jin et al introduced spherical carbon black as the gap between GO layers to form a stable 3D structure and maintain the high specific surface area of GO ( Figure 7). 68 The carbon black and graphene doped with nitrogen were obtained upon the reduction with urea. They used such a unique three-dimensional structure as the support for the growth of Pd UMNPs.…”

Section: Graphene and Its Derivativesmentioning

confidence: 99%

“…Use spherical carbon black as the gap between GO layers to maintain GO dispersion. (NCB: nitrogen-doped carbon black, NGS: nitrogen-doped graphene) (adapted with permission from ref 68. @ Copyright 2020 Elsevier B.V. All rights reserved).…”

mentioning

confidence: 99%

Controlled growth of ultrafine metal nanoparticles mediated by solid supports

et al. 2021

Nanoscale Adv.

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Engineering three-dimensional nitrogen-doped carbon black embedding nitrogen-doped graphene anchoring ultrafine surface-clean Pd nanoparticles as efficient ethanol oxidation electrocatalyst

Cited by 97 publications

References 47 publications

Effect of Sn Doping on Pd Electro-Catalysts for Enhanced Electro-Catalytic Activity towards Methanol and Ethanol Electro-Oxidation in Direct Alcohol Fuel Cells

Effect of Sn Doping on Pd Electro-Catalysts for Enhanced Electro-Catalytic Activity towards Methanol and Ethanol Electro-Oxidation in Direct Alcohol Fuel Cells

Laser-Assisted Synthesis of Pd Aerogel with Compressive Strain for Boosting Formate and Ethanol Electrooxidation

Controlled growth of ultrafine metal nanoparticles mediated by solid supports

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