Hexanedioic acid mediated in situ functionalization of interconnected graphitic 3D carbon nanofibers as Pt support for trifunctional electrocatalysts

2020 ◽  
Vol 4 (6) ◽  
pp. 2808-2822
Author(s):  
Sathyanarayanan Shanmugapriya ◽  
Palanisamy Rupa Kasturi ◽  
Pei Zhu ◽  
Jiadeng Zhu ◽  
Chaoyi Yan ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Pt Nanoparticles ◽  
Uniform Dispersion ◽  
Unique Approach ◽  
Hexanedioic Acid ◽  
In Situ Functionalization

A unique approach of in situ functionalization has resulted in the uniform dispersion of Pt nanoparticles on the surface of hexanedioic acid modified electrospun 3D carbon nanofibers (ACNFs).

Nanostructured PEFC Electrode Catalysts Prepared via In-situ Colloidal Impregnation

2004 ◽  
Vol 835 ◽  
Author(s):  
Kazunari Sasaki ◽  
Kenji Shinya ◽  
Shuhei Tanaka ◽  
Yuudai Kawazoe ◽  
Takashi Kuroki ◽  
...  
Keyword(s):  
Carbon Nanofibers ◽  
Pt Nanoparticles ◽  
Rotating Disk ◽  
Carbon Support ◽  
Crystallographic Structure ◽  
Pt Electrode ◽  
Support Materials ◽  
Catalyst Layers ◽  
Preparation Conditions

ABSTRACTNanostructured Platinum-based electrode catalysts were prepared via in-situ colloidal impregnation for polymer electrolyte fuel cells. Crystallite size, grain size, and distribution of Pt nanoparticles on carbon support materials were characterized by XRD, TEM, high-resolution FESEM, and STEM. Effective surface area and kinetically-controlled current density of Pt electrode catalysts were analyzed by cyclic and hydrodynamic voltammetry using rotating disk electrodes. PEFCs with these electrode catalysts were also prepared and their I-V characteristics were examined at 80°C.We have succeeded to develop Pt electrode catalysts with a diameter of a few nm, supported on carbon nanofibers with different structures (including herringbone-type fibers, platelet-type fibers, and highly-conductive vapor-grown fibers), carbon nanotubes, as well as carbon black. The dependencies of nanostructure and electrochemical properties on crystallographic structure of carbon support materials and preparation conditions of electrode catalysts are analyzed and discussed. Nanostructural design of PEFC electrode catalyst layers using carbon nanofibers as catalyst supports and electrode fillers is also discussed.

In situ synthesis of small Pt nanoparticles on chitin aerogel derived N doped ultra-thin carbon nanofibers for superior hydrogen evolution catalysis

2019 ◽  
Vol 43 (42) ◽  
pp. 16490-16496 ◽  
Author(s):  
Wenjie Liu ◽  
Han Zhu ◽  
Liangri Ying ◽  
Zhenfeng Zhu ◽  
Huining Li ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Carbon Nanofibers ◽  
Pt Nanoparticles ◽  
In Situ Synthesis ◽  
Thin Carbon

Small and uniform Pt NPs were in situ synthesized on chitin aerogel derived N doped ultra-thin carbon nanofibers.

scholarly journals Easy and fast in-situ functionalization of exfoliated 2D black phosphorus with gold nanoparticles

2021 ◽  
Author(s):  
Salvatore Moschetto ◽  
Andrea Ienco ◽  
Gabriele Manca ◽  
Manuel Serrano-Ruiz ◽  
Maurizio Peruzzini ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Black Phosphorus ◽  
Au Nps ◽  
In Situ Functionalization

Heterostructures of single- and few-layer black phosphorus (2D bP) functionalized with gold nanoparticles (Au NPs) have been recently reported in the literature, exploiting their intriguing properties and biocompatibility for catalytic,...

Problem-posing in management classrooms for collective sustainability transformation

2021 ◽  
Vol 22 (3) ◽  
pp. 477-496
Author(s):  
Janette Brunstein ◽  
Mark Edward Walvoord ◽  
Ed Cunliff
Keyword(s):  
Transformative Learning ◽  
Learning Objectives ◽  
Problem Posing ◽  
Content Type ◽  
Analysis Methodology ◽  
Unique Approach ◽  
Teaching Cases ◽  
Classroom Use

Purpose The purpose of this study is to examine the possible benefits of approaching sustainability-related teaching cases from the perspective of problem-posing (PP) instead of problem-solving (PS). Design/methodology/approach A document analysis methodology (Silverman, 2011) was used to analyze sustainability teaching case study abstracts and learning objectives from business databases. Cases were reviewed and classified as PP, PS or other. PP cases were further subclassified on one of three axes. Findings Of 117 cases reviewed, most were PS (66%) with only 9% PP. Theoretical and pedagogical implications are discussed with recommendations for writing or converting, PS to PP cases for classroom use. Theoretical contributions include identification of three distinct and complementary views of PP, described in these axes: emancipatory; problematizing metaphors and premises; and rational, process and means-focused cases, not triggering transformative learning theory. Of 10 cases classified as PP cases, 3 were subclassified as emancipatory. Research limitations/implications This research is limited to case study titles containing “sustainability” and analyses of their descriptions and learning objectives only. Next phases of the research will examine differences in student learning between PS and PP in situ. Practical implications The research identifies a unique approach to the authoring and use of case studies that hold the potential for increasing students’ critical thinking capabilities and production of solutions to sustainability issues. Originality/value There is limited research and analysis of the identification and implications of using PP pedagogy.

scholarly journals Evaluation of carbon fiber composites modified by in situ incorporation of carbon nanofibers

2011 ◽  
Vol 14 (4) ◽  
pp. 560-563 ◽  
Author(s):  
André Navarro de Miranda ◽  
Luiz Claudio Pardini ◽  
Carlos Alberto Moreira dos Santos ◽  
Ricardo Vieira
Keyword(s):  
Carbon Fiber ◽  
Carbon Nanofibers ◽  
Fiber Composites ◽  
Carbon Fiber Composites
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