Cobalt modified two-dimensional polypyrrole synthesized in a flat nanoreactor for the catalysis of oxygen reduction

Li, Wei; Ding, Wei; Wu, Guangping; Liao, Jianhua; Nie, Yan; Qi, Xueqiang; Li, Li; Chen, Siguo

doi:10.1016/j.ces.2015.07.008

Cited by 27 publications

(13 citation statements)

References 29 publications

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“…The deconvoluted Co 2p XPS spectra are shown in Figure C, in which Co states can be identified as Co 0 at 778.8, Co–O at 780.3, Co–N at 782.0, Co–N satellite at 785.3, and Co–O satellite at 788.2 eV. , The spectrum of CoN–Pt/CoNC-bulk shows a strong peak of metallic Co at 778.8 eV, while no Co 0 signal can be found in the case of CoN–Pt/CoNC-2D, matching well with results of the XRD and TEM in Figure A and Figure S5. Due to a similar support phase, both Pt/CoNC-2D and CoN–Pt/CoNC-2D show very similar XPS spectra for N 1s and Co 2p, as shown in Figure S10A,B.…”

Section: Resultssupporting

confidence: 57%

Synergistic CoN-Decorated Pt Catalyst on Two-Dimensional Porous Co–N-Doped Carbon Nanosheet for Enhanced Oxygen Reduction Activity and Durability

Tran

Lee

Park

et al. 2020

ACS Appl. Energy Mater.

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Herein, an oxygen reduction reaction (ORR) catalyst consisting of CoN-decorated Pt nanoparticles (NPs) on thin two-dimensional (2D) nanosheet-structured Co–N-doped porous carbon is prepared by utilizing the pyrolyzed nanosheet-shaped Co-based metal–organic framework as a template for Pt deposition. After Pt deposition and acid leaching, the remaining Co species on the Pt surface are converted to CoN species by ammonia heat treatment, which are also attached on the Pt surface. The as-synthesized CoN-decorated Pt on the Co–N-functionalized 2D carbon (CoN–Pt/CoNC-2D) displays an excellent ORR activity, better than a commercial Pt/C in half-cell and single-cell tests, and also exhibits remarkable long-term durability with only a ∼17 mV shift in half-wave potential after 30 000 potential cycles. Such excellent ORR catalytic performance is attributed to strong cooperative synergistic interactions between the CoN–Pt and CoNC-2D in the catalyst. The CoN species formed on the Pt surface not only change the Pt electronic structure by down-shifting the Pt d-band center but also passivate the Pt surface to prevent Pt oxidation and dissolution during the ORR. On the other hand, the thin porous CoNC-2D nanoflake support significantly improves the accessibility of reactants to enhance mass transfer and prevents segregation and agglomeration of CoN–Pt NPs during the ORR through strong metal–support interaction, further enhancing ORR activity and durability of the CoN–Pt/CoNC-2D catalyst.

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Section: Resultssupporting

confidence: 57%

Synergistic CoN-Decorated Pt Catalyst on Two-Dimensional Porous Co–N-Doped Carbon Nanosheet for Enhanced Oxygen Reduction Activity and Durability

Tran

Lee

Park

et al. 2020

ACS Appl. Energy Mater.

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“…The N1s spectrum of Co-NC-900 can be deconvoluted into four peaks with binding energies of 397.5, 399.2, 400.8, and 402.6 eV (Fig. 2b ), which can be assigned to pyridinic-N [ 12 , 15 ], Co-N compounds [ 18 ], graphitic-N [ 16 ], and pyridinic-N-oxides [ 17 ], respectively. These results suggest that Co-N sites (19.4 at.%) and pyridinic-N species (10.3 at.%) can be formed in Co-NC-900, but the graphitic-N (40.9 at.% in total doped nitrogen) is still to dominate in all types of nitrogen functionalities.…”

Section: Resultsmentioning

confidence: 99%

“…2c ). In addition to the peak due to the form of cobalt oxide (779.8 eV) [ 22 ], there is a distinct peak due to the Co–Nx bond at 781.8 eV [ 18 ]. A significant amount of oxygen species are also included in the catalysts.…”

Section: Resultsmentioning

confidence: 99%

The Oxygen Reduction Electrocatalytic Activity of Cobalt and Nitrogen Co-doped Carbon Nanocatalyst Synthesized by a Flat Template

Guo

et al. 2017

Nanoscale Res Lett

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The design of noble-metal-free catalysts for oxygen reduction reaction (ORR) is very important to the commercialization of fuel cells. Here, we use a Co-modified montmorillonite (Co-MMT) as a flat template to prepare Co- and N-doped nanocarbon ORR catalysts derived from carbonization of polyaniline at controlled temperatures. The use of flat template can hinder the agglomeration of polyaniline during pyrolysis process and optimize the N-rich active site density on the surface. The addition of transition metal Co in the flat MMT template can largely promote the formation of Co–N sites in prepared catalyst, facilitating the effective improvement of catalytic activity towards the ORR with a direct four-electron transfer pathway. The excellent ORR activity may be mainly attributed to high contents of graphitic N, pyridinic-N, and Co-N configurations. This study opens a new way to rationally design cheap and active ORR catalysts by using simple flat compound as a direct template.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1804-z) contains supplementary material, which is available to authorized users.

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“…The heteroatom-containing precursor method can achieve the in-situ homogeneous incorporation of heteroatom into carbonaceous materials, without pre-or post-processing. The vast majority of reports dealing with polymer materials involve the study of N-containing polymers, most frequently polypyrrole (PPy) [77,94,[98][99][100][101][102][103] and polyaniline (PAni) [77,95,97,[104][105][106][107], but also biopolymer as chitosan [23,108], and more recently polydopamine [109].…”

Section: Carbon-nanocomposites Materialsmentioning

confidence: 99%

Electrocatalysts for low temperature fuel cells

Martı́nez-Huerta

Lázaro

2017

Catalysis Today

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Low temperature fuel cells technologies are currently shifting very fast from fundamental research to real growth. The development of electrocatalysts plays a vital role in the electrocatalytic reactions involved in these devices, because the catalyst determines the overall reaction efficiency, durability and cost. This article review progress in the research and development of electrocatalysts for low temperature fuel cells technologies, with especial attention in the contribution of our research teams over the last 15 years or so. The intensive research efforts in reducing or replacing Pt-based electrodes in fuel cells have been focus in the use of carbon nanomaterials as electrocatalytic supports, including carbon nanostructures tailored by surface modification or building in particular dopants/defects. Recent research effort has also led to the use of electronic conductivity noncarbon support materials. In addition, carbon-composite materials are proving to be a robust, inexpensive and active electrocatalysts, where the synergetic effect between the carbon nanomaterials and the ceramic or polymer nanostructures can lead to a superior electrocatalytic performance and durability for low temperature fuel cells. Perspectives on these catalysts and possible pathways to address current remaining challenges are also discussed.

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Cobalt modified two-dimensional polypyrrole synthesized in a flat nanoreactor for the catalysis of oxygen reduction

Cited by 27 publications

References 29 publications

Synergistic CoN-Decorated Pt Catalyst on Two-Dimensional Porous Co–N-Doped Carbon Nanosheet for Enhanced Oxygen Reduction Activity and Durability

Synergistic CoN-Decorated Pt Catalyst on Two-Dimensional Porous Co–N-Doped Carbon Nanosheet for Enhanced Oxygen Reduction Activity and Durability

The Oxygen Reduction Electrocatalytic Activity of Cobalt and Nitrogen Co-doped Carbon Nanocatalyst Synthesized by a Flat Template

Electrocatalysts for low temperature fuel cells

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