Tailoring Carbon Nanotube Microsphere Architectures with Controlled Porosity

Zhang, Zishuai; Sadeghi, Maryam; Jervis, Rhodri; Ye, Siyu; Gostick, Jeff T.; Barralet, Jake E.; Merle, Géraldine

doi:10.1002/adfm.201903983

Cited by 16 publications

(12 citation statements)

References 51 publications

(57 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Water dissociation in the BPM provides the H + necessary to generate electrochemically active CO 2 (Figure ). From an experimental perspective, the H + flux from water dissociation can be increased by using (i) an improved water dissociation catalyst or (ii) a CEL material composed of an ionomer with a higher concentration of fixed-charge groups (i.e., a higher ion exchange capacity (IEC)) that amplifies the electric field and hence charge repulsion at the AEL/CEL interface. ,, As described in the previous section, the effect of (i) on the FE CO was investigated by increasing t H+ (eq S5) at the AEL/CEL interface, and the modeled FE CO values increased as expected (Figure S10a). Increased water dissociation activity results in a lower pH near the AEL/CEL interface (Figure S10b), which increases in situ CO 2 formation (Figure S10c).…”

Section: Cel and CL Properties Predicted By Modelingmentioning

confidence: 99%

Continuum Model to Define the Chemistry and Mass Transfer in a Bicarbonate Electrolyzer

et al. 2022

View full text Add to dashboard Cite

Bicarbonate electrolyzers are devices designed to convert CO 2 captured from point sources or the atmosphere into chemicals and fuels without needing to first isolate pure CO 2 gas. We report here an experimentally validated model that quantifies the reaction chemistry and mass transfer processes within the catalyst layer and cation exchange membrane layer of a bicarbonate electrolyzer. Our results demonstrate that two distinct chemical microenvironments are key to forming CO at high rates: an acidic membrane layer that promotes in situ CO 2 formation and a basic catalyst layer that suppresses the hydrogen evolution reaction. We show that the rate of CO product formation can be increased by modulating the catalyst and membrane layer properties to increase the rate of in situ CO 2 generation and transport to the cathode. These insights serve to inform the design of bicarbonate and BPM-based CO 2 electrolyzers while demonstrating the value of modeling for resolving rate-determining processes in electrochemical systems.

show abstract

Section: Cel and CL Properties Predicted By Modelingmentioning

confidence: 99%

Continuum Model to Define the Chemistry and Mass Transfer in a Bicarbonate Electrolyzer

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Inspired by the above investigation, the great potential of MHC nanoreactors with similar structural characteristics, such as hollow cavities, controllable porous structures, and encapsulated metal sites, etc., in hydrogenation selectivity control should be fully recognized. Through tailoring specific structural parameters of the carbon matrix, e.g., thickness, porosity, 126 and pore diameter, well-regulated accessibility to active sites as well as sensitively controlled mass transfer behavior is expected to provide more precise product distribution modulation.…”

Section: ■ Potential Prospects For Hydrogenation Applications Of Mhc ...mentioning

confidence: 99%

Metal-Loaded Hollow Carbon Nanostructures as Nanoreactors: Microenvironment Effects and Prospects for Biomass Hydrogenation Applications

Lü

Sun

et al. 2021

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

Over the past decade, metal-loaded hollow carbon nanostructures have been hailed as man-made nanoreactors (MHC nanoreactors) for extensive applications in dealing with energy and environmental issues due to their tailorable structure and electronic properties. Unlike conventional reports of hollow nanostructures with regard to synthetic methodologies or structural properties, a distinctive viewpoint on the microenvironment effects of MHC nanoreactors, i.e., metal–support interaction effect, reactant enrichment effect, molecular sieving effect, spatial compartmentation effect, and metal stabilization effect, is highlighted herein from this perspective. Furthermore, to emphasize the great potential of MHC nanoreactors in constructing a sustainable energy system to achieve a greener modern lifestyle, a review of the applications of MHC nanoreactors in the hydrogenation of typical biomass-derived molecules is presented. Additionally, prospects for broader biomass valorization applications of MHC nanoreactors, i.e., in situ hydrogen source-assisted hydrogenation, hydrogenation-involved cascade-type reactions, hydrogenation product distribution modulation, stability prolongation and recyclability enhancement, are forecasted. Toward the end of this paper, some feasible suggestions are further proposed for the enhancement of the catalytic reactivity, selectivity, stability, and sustainability of MHC nanoreactors in biomass hydrogenation, with a sincere expectation to contribute to the development of a highly efficient biomass refining system.

show abstract

“…In addition, the rich and diverse morphology of microspheres also provides many possibilities for cell culture. [ 96–99 ] As a result, microsphere can simulate cell growth in the microenvironment in vivo, so as to support large‐scale cell manufacture. He et al.…”

Section: Medical Applicationsmentioning

confidence: 99%

Preparation of Single, Heteromorphic Microspheres, and Their Progress for Medical Applications

Zhang

Wang

et al. 2020

Macro Materials & Eng

View full text Add to dashboard Cite

Microspheres applied in medical applications experience explosive development in recent years, such as drug release, cell culture, and bone tissue engineering, etc. However, there are still some bottlenecks both in economy and technology lay that cannot be ignored. For instance, microsphere technology has not been used in cell culture widely because of its uneconomical cost; as the core of drug‐loaded microsphere, targeted microsphere technology is still not mature enough. Besides, the common microsphere fabrication methods: microfluidic or emulsion technology is difficult to guarantee high biocompatibility of microsphere due to utilization of photoinitiator, crosslinking agent, surfactant, and other substances. Therefore, gas‐shearing technology has been proposed to solve these above shortcomings successfully. This paper focuses more on heteromorphic microspheres rather than on single microspheres which begins with a minute introduction of microsphere preparation methods: microfluidic, coaxial electrospray, emulsion, and gas‐shearing technology. Then its medical applications: drug release, cell culture, bone tissue engineering, and hemostasis are discussed in detail. The disadvantages of fabrication methods and bottlenecks for medical applications at present are also stated. At the end, perspectives of microsphere development are put forward.

show abstract

Tailoring Carbon Nanotube Microsphere Architectures with Controlled Porosity

Cited by 16 publications

References 51 publications

Continuum Model to Define the Chemistry and Mass Transfer in a Bicarbonate Electrolyzer

Continuum Model to Define the Chemistry and Mass Transfer in a Bicarbonate Electrolyzer

Metal-Loaded Hollow Carbon Nanostructures as Nanoreactors: Microenvironment Effects and Prospects for Biomass Hydrogenation Applications

Preparation of Single, Heteromorphic Microspheres, and Their Progress for Medical Applications

Contact Info

Product

Resources

About