Expanding the interlamellar spacing of biomass-derived hybrids with intercalated nanotubes for enhanced oxygen reduction reaction

Sun, Junting; Jin, Jiaxiang; Yang, Yukan; Wang, Jing; Guo, Junjie

doi:10.1039/d1nj05907f

Cited by 4 publications

(2 citation statements)

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“…Considering the mixture of NaCl with urea and glucose in the freeze-dried sample, the vacancies in the carbonized precursor might be one of the channels for ion diffusion, resulting in the formation of large numbers of mesopores. [18] However, the ion diffusion of NaCl was restricted due to increased ramping rates, reducing the percentage of mesopores in the obtained electrocatalysts. Therefore, the porosity of electrocatalyts was decided by the reaction of precursors and the ion diffusion of NaCl template.…”

Section: Resultsmentioning

confidence: 99%

“…Simultaneously, the slow ramping rate promotes the diffusion of Na + and Cl − . Considering the mixture of NaCl with urea and glucose in the freeze‐dried sample, the vacancies in the carbonized precursor might be one of the channels for ion diffusion, resulting in the formation of large numbers of mesopores [18] . However, the ion diffusion of NaCl was restricted due to increased ramping rates, reducing the percentage of mesopores in the obtained electrocatalysts.…”

Section: Resultsmentioning

confidence: 99%

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Unravelling Temperature Ramping Rates in Fabricating NaCl‐Induced Porous Co/N‐C Electrocatalysts for Oxygen Reduction Reaction

et al. 2022

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Pyrolysis is a necessary procedure for synthesizing carbon‐based nonprecious metal electrocatalysts via stimulating interaction and carbonization of precursors. In this work, ramping rates that correlated with thermal gradient has been investigated to reveal the configuration evolution of the precursors. Spectra characterizations demonstrated that ramping rates affected decomposition and aromatization of precursors. Increasing ramping rates improved the percentage of doped nitrogen and defects, promoting dispersion of Co atoms in the carbonaceous matrix and increasing density of active sties. In addition, the size variation of NaCl template under different ramping rates modifies the porous structure of Co/N−C electrocatalysts, greatly increasing the percentage of macropores and micropores at rapid ramping rates. As a result, electrocatalysts obtained at 5 °C min−1 exhibit comparable catalytic activity to that of Pt/C due to highly dispersed active sites and rational percentage of porosity, facilitating the sufficient reaction of oxygen along the catalysts. These results shed lights on regulating physical properties of carbonaceous electrocatalysts.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%