Nitrogen-doped graphene/carbon nanotube/Co<sub>3</sub>O<sub>4</sub> hybrids: one-step synthesis and superior electrocatalytic activity for the oxygen reduction reaction

Lu, Huijuan; Huang, Yunpeng; Yan, Jiajie; Fan, Wei; Liu, Tianxi

doi:10.1039/c5ra17759f

Cited by 30 publications

(7 citation statements)

References 45 publications

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“…The E onset values of Co 3 O 4 @GF_ox are similar to the E onset values of some reported Co 3 O 4 /carbon‐based nanocomposites, such as the Co 3 O 4 /reduced graphene oxide (rGO) nanocomposite reported by Liang et al . with an E onset value of 0.88 V vs. RHE, the Co 3 O 4 /rGO/carbon nanotubes nanocomposite reported by Lu et al . with an E onset value of 0.87 V vs. RHE, or the Co 3 O 4 /N‐doped rGO reported by Kumar et al .…”

Section: Resultsmentioning

confidence: 98%

Co₃O₄ Nanoparticles Anchored on Selectively Oxidized Graphene Flakes as Bifunctional Electrocatalysts for Oxygen Reactions

et al. 2018

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Herein, we report the preparation of Co 3 O 4 nanoparticles anchored on the surface of selectively oxidized graphene flakes with KMnO 4 and O 3 -Co 3 O 4 @GF_KMnO 4 and Co 3 O4@GF_O 3 nanocomposites -and the study of their electrocatalytic performance towards the oxygen reduction (ORR) and oxygen evolution reactions (OER). Both nanocomposites displayed ORR and OER electrocatalytic activity in alkaline medium. For ORR, onset potentials of 0.79 V and 0.82 V vs. RHE were achieved for Co 3 O 4 @GF_ KMnO 4 and Co 3 O 4 @GF_O 3 , respectively. Both nanocomposites presented excellent tolerance to methanol and, in the case of Co 3 O 4 @GF_ O 3 , a superior long-term stability with a current retention of 96.8% after 20 000 s. For OER, the overpotential was 0.44 and 0.45 V for Co 3 O 4 @GF_KMnO 4 and Co 3 O 4 @GF_O 3 , respectively. Additionally, Co 3 O 4 @GF_O 3 presented higher current densities, Faradaic efficiencies, and long-term stability (current loss of 32% after 15 000 s). The superior bifunctional ORR/OER electrocatalytic activity displayed by Co 3 O 4 @GF_O 3 arises from the stronger chemical coupling between Co 3 O 4 nanoparticles and specific oxygen surface groups of GF_O 3 flakes.

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Section: Resultsmentioning

confidence: 98%

Co₃O₄ Nanoparticles Anchored on Selectively Oxidized Graphene Flakes as Bifunctional Electrocatalysts for Oxygen Reactions

et al. 2018

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“…Many researches have investigated on Co 3 O 4 -based hybrid catalysts and obtained uniformly dispersed Co 3 O 4 nanostructures (i.e. nanoparticles, core-shell, and hollow sphere) to improve electrocatalyst activity 30 , 38 – 41 . The results show that the size and shape of the nanocatalysts are deeply related to their electrocatalytic performances, and using these hybrid catalysts is considered one of the best strategies for improving catalytic activity and stability 42 .…”

Section: Introductionmentioning

confidence: 99%

Development of Highly Active Bifunctional Electrocatalyst Using Co3O4 on Carbon Nanotubes for Oxygen Reduction and Oxygen Evolution

Ahmed

Choi

Kim

2018

Sci Rep

109

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Replacement of precious platinum catalyst with efficient and cheap bifunctional alternatives would be significantly beneficial for electrocatalytic oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) and the application of these catalysts in fuel cells is highly crucial. Despite numerous studies on electrocatalysts, the development of bifunctional electrocatalysts with comparatively better activity and low cost remains a big challenge. In this paper, we report a nanomaterial consisting of nanocactus-shaped Co3O4 grown on carbon nanotubes (Co3O4/CNTs) and employed as a bifunctional electrocatalyst for the simultaneous catalysis on ORR, and OER. The Co3O4/CNTs exhibit superior catalytic activity toward ORR and OER with the smallest potential difference (0.72 V) between the (1.55 V) for OER and E1/2 (0.83 V) for ORR. Thus, Co3O4/CNTs are promising high-performance and cost-effective bifunctional catalysts for ORR and OER because of their overall superior catalytic activity and stability compared with 20 wt% Pt/C and RuO2, respectively. The superior catalytic activity arises from the unique nanocactus-like structure of Co3O4 and the synergetic effects of Co3O4 and CNTs.

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“…For the ORR, higher cathodic currents, more positive half‐wave potentials as well as higher electron transfer number per oxygen molecule are observed for the N‐doped material. This can be ascribed to polarization induced by nitrogen atoms into graphene planes . Dai et al.…”

Section: Introductionmentioning

confidence: 99%

Metal Loading Effect on the Activity of Co₃O₄/N‐Doped Reduced Graphene Oxide Nanocomposites as Bifunctional Oxygen Reduction/Evolution Catalysts

et al. 2017

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The development of effective and stable reversible oxygen electrodes is of upmost importance for bringing regenerative energy storage and conversion systems to a commercial reality. However, realization of such electrodes is motivated by low activity and instability of the current electrocatalysts working for both water splitting and oxygen reduction. Herein, we report a series of Co3O4/graphene‐based catalysts with different Co mass loadings prepared by using a facile one‐step hydrothermal route. N‐doped reduced graphene oxide (NRGO) was utilized as a substrate for the deposition of oxide particles. The structural properties and surface composition of the different materials were investigated by powder X‐ray diffraction, transmission electron microscopy, and X‐ray photoelectron spectroscopy measurements. The effect of Co mass loading on the morphostructural properties of oxide nanoparticles and also on their electroactivity towards the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) was addressed. This study revealed the optimum range for metal loading on the graphene substrate. Co3O4/NRGO with a Co mass loading of 30 wt.% exhibits the highest activity towards ORR and OER, with a reversibility criterion of 763 mV. This work is very helpful for the electrocatalysis community, and will allow effective catalysts to be developed for high‐power metal/air battery or regenerative fuel cell systems, based on earth‐abundant and scalable electrocatalysts.

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Nitrogen-doped graphene/carbon nanotube/Co₃O₄ hybrids: one-step synthesis and superior electrocatalytic activity for the oxygen reduction reaction

Abstract: N-rGO/CNTs/Co3O4 hybrids were prepared through a simple one-step hydrothermal method, and exhibited comparable electrocatalytic ORR activity to Pt/C catalysts, excellent tolerance to methanol crossover effects, and even better long-term stability.

Cited by 30 publications

References 45 publications

Co₃O₄ Nanoparticles Anchored on Selectively Oxidized Graphene Flakes as Bifunctional Electrocatalysts for Oxygen Reactions

Co₃O₄ Nanoparticles Anchored on Selectively Oxidized Graphene Flakes as Bifunctional Electrocatalysts for Oxygen Reactions

Development of Highly Active Bifunctional Electrocatalyst Using Co3O4 on Carbon Nanotubes for Oxygen Reduction and Oxygen Evolution

Metal Loading Effect on the Activity of Co₃O₄/N‐Doped Reduced Graphene Oxide Nanocomposites as Bifunctional Oxygen Reduction/Evolution Catalysts

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Nitrogen-doped graphene/carbon nanotube/Co3O4 hybrids: one-step synthesis and superior electrocatalytic activity for the oxygen reduction reaction

Abstract: N-rGO/CNTs/Co3O4 hybrids were prepared through a simple one-step hydrothermal method, and exhibited comparable electrocatalytic ORR activity to Pt/C catalysts, excellent tolerance to methanol crossover effects, and even better long-term stability.

Cited by 30 publications

References 45 publications

Co3O4 Nanoparticles Anchored on Selectively Oxidized Graphene Flakes as Bifunctional Electrocatalysts for Oxygen Reactions

Co3O4 Nanoparticles Anchored on Selectively Oxidized Graphene Flakes as Bifunctional Electrocatalysts for Oxygen Reactions

Development of Highly Active Bifunctional Electrocatalyst Using Co3O4 on Carbon Nanotubes for Oxygen Reduction and Oxygen Evolution

Metal Loading Effect on the Activity of Co3O4/N‐Doped Reduced Graphene Oxide Nanocomposites as Bifunctional Oxygen Reduction/Evolution Catalysts

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Nitrogen-doped graphene/carbon nanotube/Co₃O₄ hybrids: one-step synthesis and superior electrocatalytic activity for the oxygen reduction reaction

Co₃O₄ Nanoparticles Anchored on Selectively Oxidized Graphene Flakes as Bifunctional Electrocatalysts for Oxygen Reactions

Co₃O₄ Nanoparticles Anchored on Selectively Oxidized Graphene Flakes as Bifunctional Electrocatalysts for Oxygen Reactions

Metal Loading Effect on the Activity of Co₃O₄/N‐Doped Reduced Graphene Oxide Nanocomposites as Bifunctional Oxygen Reduction/Evolution Catalysts