Remarkable enhancement of pyrolytic carbon deposition on ordered mesoporous silicas by their trimethylsilylation

Hoshikawa, Yasuto; Castro-Muñiz, Alberto; Komiyama, Hiroshi; Ishii, Takafumi; Yokoyama, Takuji; Nanbu, Hironobu; Kyotani, Takashi

doi:10.1016/j.carbon.2013.09.075

Cited by 17 publications

(23 citation statements)

References 45 publications

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“…In the present work, instead of the above wet process, we try to coat mesoporous silica (SBA-15) with a thin layer of Ndoped carbon by means of chemical vapor deposition (CVD) using the method recently developed in our group. 18 Our previous study has revealed that, when the silica surface is silylated, the Si radicals formed during the CVD process significantly catalyze the pyrolytic carbon deposition from hydrocarbon molecules having a C−C triple bond such as acetylene, and carbon-coated SBA-15 has been obtained as a result. Here we use acetonitrile instead of acetylene as a CVD source.…”

Section: Introductionmentioning

confidence: 99%

Real Understanding of the Nitrogen-Doping Effect on the Electrochemical Performance of Carbon Materials by Using Carbon-Coated Mesoporous Silica as a Model Material

et al. 2016

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The main aim of the present work is to precisely understand the sole effect of nitrogen doping on the electrochemical performance of porous carbon materials. To achieve this objective, the whole surface of mesoporous silica (SBA-15) was coated with a thin layer of carbon (about 0.4 nm) with and without N-doping by using acetonitrile and acetylene chemical vapor deposition, respectively. The resulting N-doped and nondoped carbon-coated silica samples have mesopore structures identical to those in the original SBA-15, and they are practically the same in terms of not only the pore size and pore structure but also the particle size distribution and particle morphology, with the exception of N-doping, which makes them unique model materials to extract the sole effect of nitrogen on the performances of electrochemical capacitors and electrocatalytic oxygen reduction. Moreover, the outstanding features of the carbon-coated silica samples allow even a quantitative understanding of the pseudocapacitance induced by nitrogen functionalities on the carbon surface in an acidic aqueous electrolyte.

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Section: Introductionmentioning

confidence: 99%

Real Understanding of the Nitrogen-Doping Effect on the Electrochemical Performance of Carbon Materials by Using Carbon-Coated Mesoporous Silica as a Model Material

et al. 2016

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“…CVD has been widely used in synthesizing carbon nanotubes and graphene with metals as catalysts . In most CVD processes, however, the carbon sources used are usually gases, such as ethylene, acetylene, acetonitrile, methane, toluene, [13] and so forth. Employing renewable solid carbon sources in a catalyst‐free CVD process to prepare HCMs is rarely reported.…”

Section: Background and Originality Contentmentioning

confidence: 99%

Nano‐structured Hollow Carbon Materials from a Non‐isothermal Chemical Vapor Deposition of Polyphenols

Cai

Yang

et al. 2020

Chin. J. Chem.

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of main observation and conclusion Pyrogallic acid (PG) was used as a modeling carbon source in fabricating nano-structured hollow carbon materials (HCMs) by a chemical vapor deposition (CVD) method. We found that non-isothermal deposition can improve the integrity of the obtained HCMs. The different pyrolyzed species from PG under varied temperatures lead to the temperature-dependent deposition yield, graphitization degree and morphology of the HCMs. HCMs including hollow spheres of varied sizes, cubic boxes with yolk-shell structure, nanotubes, mesoporous particles and double-shelled fibers, were prepared by using different templates, demonstrating the universality of this strategy. The carbon source has been extended to other plant polyphenols. The abundant and renewable solid precursors for CVD method endow this strategy excellent operation safety, improved storage and transportation convenience and low cost, and would boost the production of morphology-and size-controlled HCMs and their applications in the fields such as water treatment, electrode materials, adsorbent, drug delivery, and so forth.

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“…Alternatively, replication of nanostructured templates could be achieved via chemical vapor deposition (CVD) processes . Classically, CVD is used for the production of solid thin films on flat substrates, and also mesoporous membranes were employed as templates for the synthesis of carbon nanotubes. − Commonly, gaseous hydrocarbons (e.g., ethylene, methane, benzene, and acetylene) are decomposed at the host material. − The simultaneous deposition of metal particles and carbon was achieved by sublimation and subsequent pyrolysis of ferrocene . Recently, Lei et al extended this approach, employing mesoporous ordered silica (SBA-15) powder as the template.…”

Section: Introductionmentioning

confidence: 99%

Chemical Vapor Deposition of Hollow Graphitic Spheres for Improved Electrochemical Durability

Knossalla

Mielby

Göhl

et al. 2021

ACS Appl. Energy Mater.

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The wet-chemical synthesis of hollow graphitic spheres, a highly defined model catalyst support for electrocatalytic processes, is laborious and not scalable, which hampers potential applications. Here, we present insights into the chemical vapor deposition (CVD) of ferrocene as a simple, scalable method to synthesize hollow graphitic spheres (HGS cvd ). During the CVD process, iron and carbon are embedded in the pores of a mesoporous silica template. In a subsequent annealing step, iron facilitates the synthesis of highly ordered graphite structures. We found that the applied temperature treatment allows for controlling of the degree of graphitization and the textural properties of HGS cvd . Further, we demonstrate that platinum loaded on HGS cvd is significantly more stable during electrochemical degradation protocols than catalysts based on commercial high surface area carbons. The established CVD process allows the scalable synthesis of highly defined HGS and therefore removes one obstacle for a broader application.

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Remarkable enhancement of pyrolytic carbon deposition on ordered mesoporous silicas by their trimethylsilylation

Cited by 17 publications

References 45 publications

Real Understanding of the Nitrogen-Doping Effect on the Electrochemical Performance of Carbon Materials by Using Carbon-Coated Mesoporous Silica as a Model Material

Real Understanding of the Nitrogen-Doping Effect on the Electrochemical Performance of Carbon Materials by Using Carbon-Coated Mesoporous Silica as a Model Material

Nano‐structured Hollow Carbon Materials from a Non‐isothermal Chemical Vapor Deposition of Polyphenols

Chemical Vapor Deposition of Hollow Graphitic Spheres for Improved Electrochemical Durability

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