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Its porous carbon composites and electrochemical properties of

Author: BaiJing
Tutor: GuoLiPing
School: Northeast Normal University
Course: Analytical Chemistry
Keywords: Mesoporous Carbon Electrocatalytic Oxygen-containing functional groups Hydrogen peroxide Glucose
CLC: O657.1
Type: PhD thesis
Year: 2011
Downloads: 268
Quote: 0
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Abstract

Porous carbon material as a novel class of carbon materials in recent years, more and more attention by people. The porous carbon materials have uniform pore size, high surface area and large pore volume, and widely used in gas separation, water purification, catalyst carrier, capacitors, and fuel cells. In recent years, more and more porous carbon materials for electrochemical analysis, and obtained good results. Therefore, on the basis of previous studies, this paper studied in detail the electrochemical properties of porous carbon material and electrical analysis, including electro-catalytic properties, mainly including the following aspects: 1. An ordered mesoporous silica SBA-15 as template, sucrose as carbon source to synthesize two-dimensional ordered mesoporous carbon OMC. OMC as the electrode material in the electrode surface modified realization of environmental pollutants hydroquinone isomers at the same time, and the results show that in the OMC modified electrodes isomers oxidation peak can be well separated from hydroquinone and catechol oxidation peak potential difference of 150mV, catechol and resorcinol oxidation peak potential difference is 370mV, for simultaneous detection of dihydroxybenzene isomers provides great selectivity. Meanwhile OMC modified electrode was also used to detect vitamin B2, shows the optimum pH value (pH7.0), vitamin B2 The modified electrode shows good electrochemical reaction, high sensitivity and low 769μA mM-1 The detection limit of 2 × 10 ^{-8 M. Furthermore, OMC modified electrode shows good stability and reproducibility for the detection of the actual sample, satisfactory results. (2) some of the inorganic molecules or organic polymers doped mesoporous structure can broaden and improve the ability to detect OMC. In this article we will Prussian Blue PB electrodeposited on OMC obtained PB / OMC composites, PB retain the original electrochemical activity. PB / OMC modified electrode for detecting hydrogen peroxide, the results show that the modified electrode compared to pure PB, PB / OMC modified electrode shows a wide pH range, high stability and a large response current. OMC adding greatly improved electrocatalytic properties of PB, PB may be due to the synergistic effect of OMC and the result of the role. Therefore, the work may be OMC functionalized inorganic electroluminescent active molecule opens up a new path. 3 discusses the OMC electric catalytic mechanism. Although the OMC demonstrated the potential catalytic ability, but now it's catalytic mechanism is not well understood. Only some speculate OMC very high catalytic activity may be attributed to appear on its surface with oxygen-containing functional groups and the potential for defects. We deal with different reagents OMC, the OMC to get different types of surface oxygen functional groups, with NADH and H ₂ O ₂ as a probe to characterize containing different oxygenated OMC functional groups electrocatalytic activity is discussed in detail oxygen-containing functional groups on the catalytic ability of OMC. The results show that the acid treatment OMC demonstrate the highest electrocatalytic activity, however, alkali-treated electro-catalytic activity of OMC OMC same untreated. Concluded that acid treatment process produces acidic functional groups on the OMC contributes to good electrocatalytic activity. 4 we also to the nano-CaCO ₃ as a template, synthesis of a large diameter of about 50nm mesoporous carbon LMC, and a number of electro-active substances commonly used as probes to characterize the catalytic activity of the LMC, The results show that with the CNT / GCE than LMC / GCE demonstrated high catalytic activity, which is likely to be due to the large mesoporous carbon has a large aperture, and more conducive to the diffusion.}

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