Nitrogen-doped carbon sponge derived from the self-assembly of poly(amic acid) for high performance oxygen reduction reaction

Sun, Hui; Jin, Kai; Li, Xiao; Lai, Xiaoyong

doi:10.1039/d2nj05652f

Cited by 5 publications

(8 citation statements)

References 70 publications

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“…In our previous study [ 49 ], we investigated the ORR catalytic performance of NCS, exhibiting an onset potential (E onset ) of 0.940 V vs. RHE, a half-wave potential (E 1/2 ) of 0.816 V vs. RHE, and a limiting current density (J L ) of 4.34 mA cm −2 . In order to further improve the catalytic activity, we used NCS as supports to load various transition metal nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

“…The E 1/2 of Co/CoO@NCS is 0.800 V vs. RHE after 1000 cycles with an attenuation of 30 mV, while the E 1/2 of Pt/C decays to 0.780 V vs. RHE, indicating the better cycle stability of Co/CoO@NCS. We speculated that the good catalytic activity and stability of Co/CoO@NCS was ascribed to several reasons: (1) the high porous structure of NCS with ultrathin frameworks, which facilitated the charge and mass transfer [ 49 ]; (2) the small size of Co/CoO nanoparticles; and (3) the synergistic effect between NCS and ultrafine Co/CoO nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

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Facile Preparation of Cobalt Nanoparticles Encapsulated Nitrogen-Doped Carbon Sponge for Efficient Oxygen Reduction Reaction

Leng

Jin²,

Wang³

et al. 2023

Polymers

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The facile preparation of non-noble metal nanoparticle loaded carbon nanomaterials is promising for efficient oxygen reduction reaction (ORR) electrocatalysis. Herein, a facile preparation strategy is proposed to prepare nitrogen-doped carbon sponge loaded with fine cobalt nanoparticles by the direct pyrolysis of the cobalt ions adsorbed polymeric precursor. The polymeric sponge precursor with continuous framework and high porosity is formed by the self-assembly of a poly(amic acid). Taking advantage of the negatively charged surface and porous structure, cobalt ions can be efficiently adsorbed into the polymeric sponge. After pyrolysis, fine cobalt nanoparticles covered by carbon layers are formed, while the sponge-like structure of the precursor is also well-preserved in order to give cobalt nanoparticles loaded nitrogen-doped carbon sponges (Co/CoO@NCS) with a high loading content of 44%. The Co/CoO@NCS exhibits promising catalytic activity toward ORR with a half-wave potential of 0.830 V and a limiting current density of 4.71 mA cm−2. Overall, we propose a facile polymer self-assembly strategy to encapsulate transition metal nanoparticles with high loading content on a nitrogen-doped carbon sponge for efficient ORR catalysis.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Facile Preparation of Cobalt Nanoparticles Encapsulated Nitrogen-Doped Carbon Sponge for Efficient Oxygen Reduction Reaction

Leng

Jin²,

Wang³

et al. 2023

Polymers

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Section: Resultsmentioning

confidence: 99%

“…The synthesis of PAA was carried out according to our previous publication, as shown in Scheme S1 [ 34 , 35 ]. Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance ( 1 H NMR) were conducted to confirm the structure of PAA ( Figures S1 and S2 ) [ 34 , 35 ]. The PAA sponge was prepared by directly adding deionized water to the PAA solution (30 mg mL −1 ), diluted by the stock solution with N , N -dimethylformamide (DMF).…”

Section: Resultsmentioning

confidence: 99%

Efficient Removal of Pb(Ⅱ) by Highly Porous Polymeric Sponges Self-Assembled from a Poly(Amic Acid)

et al. 2023

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Lead (II) (Pb(II)) is widespread in water and very harmful to creatures, and the efficient removal of it is still challenging. Therefore, we prepared a novel sponge-like polymer-based absorbent (poly(amic acid), PAA sponge) with a highly porous structure using a straightforward polymer self-assembly strategy for the efficient removal of Pb(II). In this study, the effects of the pH, dosage, adsorption time and concentration of Pb(II) on the adsorption behavior of the PAA sponge are investigated, revealing a rapid adsorption process with a removal efficiency up to 89.0% in 2 min. Based on the adsorption thermodynamics, the adsorption capacity increases with the concentration of Pb(II), reaching a maximum adsorption capacity of 609.7 mg g−1 according to the Langmuir simulation fitting. Furthermore, the PAA sponge can be efficiently recycled and the removal efficiency of Pb(II) is still as high as 93% after five adsorption–desorption cycles. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy analyses reveal that the efficient adsorption of Pb(II) by the PAA sponge is mainly due to the strong interaction between nitrogen-containing functional groups and Pb(II), and the coordination of oxygen atoms is also involved. Overall, we propose a polymer self-assembly strategy to easily prepare a PAA sponge for the efficient removal of Pb(II) from water.

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“…Homopolymer self-assembly also shows potentials in water treatment, catalysis and energy storage. ,,, In this section the applications in catalysis, , energy storage, , and water treatment will be summarized.…”

Section: Emerging Applications Of Homopolymer Self-assemblymentioning

confidence: 99%

Homopolymer Self-Assembly: Principles, Driving Forces, and Applications

Li,

Fan,

et al. 2023

Chem. Mater.

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Nitrogen-doped carbon sponge derived from the self-assembly of poly(amic acid) for high performance oxygen reduction reaction

Abstract: Nitrogen-doped carbon materials with highly porous structures and interconnected ultrathin frameworks have shown outstanding features for electrocatalytic applications. Herein, we propose a self-assembly strategy to prepare nitrogen-doped carbon sponge (NCS)...

Cited by 5 publications

References 70 publications

Facile Preparation of Cobalt Nanoparticles Encapsulated Nitrogen-Doped Carbon Sponge for Efficient Oxygen Reduction Reaction

Facile Preparation of Cobalt Nanoparticles Encapsulated Nitrogen-Doped Carbon Sponge for Efficient Oxygen Reduction Reaction

Efficient Removal of Pb(Ⅱ) by Highly Porous Polymeric Sponges Self-Assembled from a Poly(Amic Acid)

Homopolymer Self-Assembly: Principles, Driving Forces, and Applications

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