Pt/C–LiCoO<sub>2</sub>composites with ultralow Pt loadings as synergistic bifunctional electrocatalysts for oxygen reduction and evolution reactions

Su, Chao; Yang, Yongzhen; Zhou, Wei; Wang, Wei; Xu, Xiaomin; Shao, Zongping

doi:10.1039/c5ta10492k

Cited by 68 publications

(25 citation statements)

References 66 publications

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“…However, the commercialization of these fuel cells is still hampered by the high cost and the poor stability of the Pt‐based oxygen reduction reaction (ORR) electrocatalysts. These limitations stimulated the search for alternative electrocatalysts for the ORR with lower Pt loadings or, preferably, devoid of noble metals . Initially, the attempts mainly focused on pyrolyzed carbon‐supported transition metal complexes, but neither the stability nor the activity of these electrocatalysts reached the desired levels.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Composition and Preparation of the Rotating Disk Electrode on the Performance of Mesoporous Electrocatalysts in the Alkaline Oxygen Reduction Reaction

et al. 2017

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We report a systematic study of the influence of the composition and preparation method of the electrocatalyst layer deposited on the rotating (ring) disk electrodes (RDE/ RRDE) employed in the alkaline oxygen reduction reaction (ORR). To investigate and rationalize the generally underestimated role of these factors on the ORR performance of mesoporous electrocatalysts, we studied the activity and selectivity of nitrogen-doped ordered mesoporous carbon as a function of the loading of electrocatalyst and of binder, of the type of binder, and of the addition order of the components onto the electrode. The use of an anion-exchange polymer (Fumion FAA-3 ) as the binder instead of the commonly employed Nafion increased the selectivity towards H 2 O 2 and led to a lower kinetic current density. In addition, higher selectivity towards H 2 O was observed when increasing the loading of the catalyst and of the binder, although the latter resulted in a decreased kinetic current density. These results prove the crucial effect of the composition and preparation method of the layer deposited on the electrode on the ORR performance of the mesoporous electrocatalyst and can provide useful guidelines in view of the translation of the results of RDE studies to an alkaline fuel-cell setup.

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Section: Introductionmentioning

confidence: 99%

Influence of the Composition and Preparation of the Rotating Disk Electrode on the Performance of Mesoporous Electrocatalysts in the Alkaline Oxygen Reduction Reaction

et al. 2017

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“…(Table S4, Supporting Information). We demonstrated that the novel Pt‐based N‐CNµS electrocatalysts (nucleation time: 50 ms) generated a mass activity (up to 0.1 A mg −1 Pt at −0.2 V vs SCE) which is considered to be promising based on some reported values for commercial catalysts . Besides Pt group metals, transition metal oxides also have been widely used for the ORR, and some of catalysts like Co 3 O 4, Mn 3 O 4 , and Mo–Co spinel oxides, are reported having excellent catalytic activities toward ORR (Table S4, Supporting Information).…”

Section: Resultsmentioning

confidence: 91%

Cavitation Mediated 3D Microstructured Architectures from Nanocarbon

Zhang

Gbureck

et al. 2018

Adv Funct Materials

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Here, the formation of high surface area microscale assemblies of nanocarbon through phosphate and ultrasound cavitation treatment is reported. Despite high conductivity and large surface area, potential health and safety concerns limit the use of nanocarbon and add challenges to handling. Previously, it is shown that phosphate ultrasonic bonding is ineffective for organic materials but in this study, it is found that by a preliminary oxidizing treatment, several carbons can be readily assembled from xerogels. Assembling nanocarbon into microparticles can usually require a binder or surfactants, which can reduce surface area or conductivity and generate a low microsphere yield. Carbon nanotube microspheres are nitrogen-doped and flower-like nanostructured Pt deposited on their surface, and finally showcased as efficient cathode electrocatalysts for the oxygen reduction reaction (half-wave potential 0.78 V vs reversible hydrogen electrode) and methanol oxidation (417 mA mg −1 ). In particular, no significant degradation of the catalysts is detected after 12 000 cycles (26.6 h). These results indicate the potential of this multimaterial assembly method and open a new way to improve handling of nanoscale materials.

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“…The structural characterization of the oxides by XRD using the High Score X`Pert software and the ICDD database, led to a classification according to the reference materials LiCoO2 ICSD code: 00-016-0427 with rhombohedral geometry and space group R-3m (166) and LiMn2O4 ICSD code: 00-018-0736, with cubic geometry and space group Fm-3m (225), according to preliminary works [11][12]. The crystallite size was obtained by means of the Debye-Scherrer equation, resulting in the presence of nanometric crystallites in the range of 5-8nm, using the most intense diffraction signals in each case.…”

Section: Resultsmentioning

confidence: 99%

Chemical obtaining of LiMO₂and LiM₂O₄(M=Co, Mn) oxides, for cathodic applications in Li-ion batteries

Neira-Guio

Cuaspud

López

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. This paper describes the synthesis and characterization of two spinel and olivinetype multicomponent oxides based on LiMO2 and LiM2O4 systems (M=Co and Mn), which represent the current state of the art in the development of cathodes for Li-ion batteries. A simple combustion synthesis process was employed to obtain the nanometric oxides in powder form (crystal sizes around 5-8nm), with a number of improved surface characteristics. The characterization by X-Ray Diffraction (XRD), Scanning and Transmission Electron Microscopy (SEM, TEM) and X-Ray Fluorescence (XRF), allowed to evaluate the morphology and the stoichiometric compositions of solids, obtaining a concordant pure crystalline phase of LiCoO2 and LiMn2O4 oxides identified in a rhombohedral and cubic phase with punctual group R-3m (1 6 6) and Fm-3m (2 2 5) respectively. The electrical characterization of materials developed by impedance spectroscopy solid state, allowed to determine a p-type semiconducting behaviour with conductivity values of 6.2×10 -3 and 2.7×10 -7 S for LiCoO2 and LiMn2O4 systems, consistent with the state of the art for such materials.

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Pt/C–LiCoO₂composites with ultralow Pt loadings as synergistic bifunctional electrocatalysts for oxygen reduction and evolution reactions

Abstract: A composite material with ultralow Pt loading showed excellent bifunctionality for the ORR and OER due to a synergistic effect.

Cited by 68 publications

References 66 publications

Influence of the Composition and Preparation of the Rotating Disk Electrode on the Performance of Mesoporous Electrocatalysts in the Alkaline Oxygen Reduction Reaction

Influence of the Composition and Preparation of the Rotating Disk Electrode on the Performance of Mesoporous Electrocatalysts in the Alkaline Oxygen Reduction Reaction

Cavitation Mediated 3D Microstructured Architectures from Nanocarbon

Chemical obtaining of LiMO₂and LiM₂O₄(M=Co, Mn) oxides, for cathodic applications in Li-ion batteries

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Pt/C–LiCoO2composites with ultralow Pt loadings as synergistic bifunctional electrocatalysts for oxygen reduction and evolution reactions

Abstract: A composite material with ultralow Pt loading showed excellent bifunctionality for the ORR and OER due to a synergistic effect.

Cited by 68 publications

References 66 publications

Influence of the Composition and Preparation of the Rotating Disk Electrode on the Performance of Mesoporous Electrocatalysts in the Alkaline Oxygen Reduction Reaction

Influence of the Composition and Preparation of the Rotating Disk Electrode on the Performance of Mesoporous Electrocatalysts in the Alkaline Oxygen Reduction Reaction

Cavitation Mediated 3D Microstructured Architectures from Nanocarbon

Chemical obtaining of LiMO2and LiM2O4(M=Co, Mn) oxides, for cathodic applications in Li-ion batteries

Contact Info

Product

Resources

About

Pt/C–LiCoO₂composites with ultralow Pt loadings as synergistic bifunctional electrocatalysts for oxygen reduction and evolution reactions

Chemical obtaining of LiMO₂and LiM₂O₄(M=Co, Mn) oxides, for cathodic applications in Li-ion batteries