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Electrochemical Studies of Graphene-...

Xie, Yuqun.

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Electrochemical Studies of Graphene-like materials Synthesized by the Thermolyzed Asphalt Reaction.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Electrochemical Studies of Graphene-like materials Synthesized by the Thermolyzed Asphalt Reaction./
作者:	Xie, Yuqun.
面頁冊數:	150 p.
附註:	Source: Dissertation Abstracts International, Volume: 74-12(E), Section: B.
Contained By:	Dissertation Abstracts International74-12B(E).
標題:	Chemistry, Analytical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3572662
ISBN:	9781303387746

Electrochemical Studies of Graphene-like materials Synthesized by the Thermolyzed Asphalt Reaction.
Xie, Yuqun.

Electrochemical Studies of Graphene-like materials Synthesized by the Thermolyzed Asphalt Reaction. - 150 p.

Source: Dissertation Abstracts International, Volume: 74-12(E), Section: B.

Thesis (Ph.D.)--University of Idaho, 2013.

Developing a facile and cost effective synthetic method for producing graphene materials has been an attractive research topic in several disciplines. Chapter 3 demenstrates sheets of multilayered graphene-like paper materials more than 10 cm2 in area were synthesized in the "Thermolyzed Asphalt Reaction (TAR)". TAR is processed within open containers at 650 °C under atmospheric pressure without the need to exclude oxygen, which is the lowest reported temperature for chemical vapor deposition of graphene-based materials. It was found that multilayered graphene-like materials can be grown on amorphous substrates without catalysts. In chapter 4, further studies of the TAR mechanism have allowed sulfur to be identified as an important co-factor in multilayer graphene-like materials formation. Graphene-like material was produced from simple precursors such as elemental sulfur and cyclohexanol. A proposed scheme illustrates sulfur's role in the growth of graphene-like material based on thermogravimetric analyses. We hypothesize that elemental sulfur is involved with the dehydration/dehydrogenation and eventual crosslinking of cyclohexanol between 100-140 °C. In the range of 240-400 °C further dehydrogenation steps occur yielding an unidentified intermediate with a sharp Raman peak at 1450 cm-1 At 550 °C graphene-like Raman D and G bands appear along with the 1450 cm band of the intermediate. At 600 °C and higher temperatures, the intermediate peak is lost with only bands characteristic of graphene-like material being seen in the spectrum of the material synthesized from the University of Idaho Thermolyzed Asphalt Reaction (GUITAR). Sulfur as a key co-factor for GUITAR synthesis is reinforced by results found with other hydrocarbons. Other organics succeeded or failed in GUITAR formation based on melting and boiling considerations. The failure of the compounds with a boiling point below -89°C, melting point above 300°C is reasoned with the volatility of the dehydration products and lacking of sulfur cross-linking in solid state.

ISBN: 9781303387746Subjects--Topical Terms:

586156
Chemistry, Analytical.

Electrochemical Studies of Graphene-like materials Synthesized by the Thermolyzed Asphalt Reaction.
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245 1 0 $a Electrochemical Studies of Graphene-like materials Synthesized by the Thermolyzed Asphalt Reaction.
300 $a 150 p.
500 $a Source: Dissertation Abstracts International, Volume: 74-12(E), Section: B.
500 $a Adviser: I. Francis Cheng.
502 $a Thesis (Ph.D.)--University of Idaho, 2013.
520 $a Developing a facile and cost effective synthetic method for producing graphene materials has been an attractive research topic in several disciplines. Chapter 3 demenstrates sheets of multilayered graphene-like paper materials more than 10 cm2 in area were synthesized in the "Thermolyzed Asphalt Reaction (TAR)". TAR is processed within open containers at 650 °C under atmospheric pressure without the need to exclude oxygen, which is the lowest reported temperature for chemical vapor deposition of graphene-based materials. It was found that multilayered graphene-like materials can be grown on amorphous substrates without catalysts. In chapter 4, further studies of the TAR mechanism have allowed sulfur to be identified as an important co-factor in multilayer graphene-like materials formation. Graphene-like material was produced from simple precursors such as elemental sulfur and cyclohexanol. A proposed scheme illustrates sulfur's role in the growth of graphene-like material based on thermogravimetric analyses. We hypothesize that elemental sulfur is involved with the dehydration/dehydrogenation and eventual crosslinking of cyclohexanol between 100-140 °C. In the range of 240-400 °C further dehydrogenation steps occur yielding an unidentified intermediate with a sharp Raman peak at 1450 cm-1 At 550 °C graphene-like Raman D and G bands appear along with the 1450 cm band of the intermediate. At 600 °C and higher temperatures, the intermediate peak is lost with only bands characteristic of graphene-like material being seen in the spectrum of the material synthesized from the University of Idaho Thermolyzed Asphalt Reaction (GUITAR). Sulfur as a key co-factor for GUITAR synthesis is reinforced by results found with other hydrocarbons. Other organics succeeded or failed in GUITAR formation based on melting and boiling considerations. The failure of the compounds with a boiling point below -89°C, melting point above 300°C is reasoned with the volatility of the dehydration products and lacking of sulfur cross-linking in solid state.
520 $a Chapter 5 established GUITAR as a suitable material for dimensionally stable anodes (DSAs) because of its remarkable anodic stability revealed by electrochemical characterization. Cyclic voltammetric evaluation of GUITAR with Ru(NH3)63+/2+ and Fe(CN)6 3-/4- redox couples suggests that GUITAR enables faster electron transfer than chemical vapor deposition (CVD) grown graphene and highly ordered pyrolytic graphite (HOPG), even though GUITAR shares a common morphological phenomenon with HOPG, namely an atomically flat basal plane. At a current density of 200 muAcm -2, the anodic limit of GUITAR is 2.7 V vs SHE in 1MH2SO 4, GUITAR as a new material for DSAs was reinforced by its performance on methylene blue degradation, the normalized methylene blue degradation rate constant obtained with GUITAR was 10 times higher than that of boron doped dimond anode.
520 $a In chapter 6, GUITAR formed on the surface of silica nanosprings composites was employed as the electrode material for an ultracapacitor. A 2.35 nm thin graphene film on the silica nanosprings surface offered a straight electron path through the high surface area of the silica nanosprings. Additionally, the high porosity of the silica nanosprings backbone enables facile electrolyte access to the graphene surface, resulting in the maxmum surface area utilization of a graphene-like films coated silica nanosprings composite electrode. The specific capacitance of 337 F g-1 was obtained in a concentrated H2SO4 electrolyte with a scan rate of 0.01 Vs -1. Nearly perfect capacitive behavior was observed with symmetric static charge /discharge curves at various current rates. A low equivalent series resistance (0.4 O) was measured with graphenelike silica nanosprings composites configured as an ultracapacitor. Superior electrochemical performance of graphene-like silica nanosprings composites as the electrode of an ultracapacitor was achieved when compared to ultracapacitors based on reduced graphene oxide and carbon nano-tubes.
590 $a School code: 0089.
650 4 $a Chemistry, Analytical. $3 586156
650 4 $a Chemistry, Inorganic. $3 517253
650 4 $a Engineering, Materials Science. $3 1017759
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710 2 $a University of Idaho. $b Chemistry. $3 2094185
773 0 $t Dissertation Abstracts International $g 74-12B(E).
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