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收集所有交通大學研究人員與學生個人或團體所發表之各項學術著作，涵蓋期刊論文、教師專書、學位論文等項。;;Collections of Publications of NCTU Researchers and Students Like Journal Papers and Thesis.

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Subject: search.filters.subject.Electrocatalytic reaction

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    (1)多功能團樹枝狀的高分子其合成及物性之探 討;(2)有機金屬化合物的二次非線性光學效應
    (1995)
    許慶豐
    ;
    CHINGFONGSHU
    ;
    國立交通大學應用化學系
    本計畫部分(1)的目的在於合成具有電化學 效應的樹枝狀高分子.使用逐步收斂的合成方 法,這樹枝狀的高分子其立體結構及功能團的 置放位置與數目可被準確的控制.此樹枝狀的 高分子將被應用在電化學的研究,譬如電子的 移轉及電催化反應.此外我們也將合成某些工 程塑膠其類似樹枝狀的高分子,並分析其特性, 期望這些樹枝狀的高分子能有具較佳的溶解度 及製成性.本計畫部分(2)的主旨在於有系統的 研究具有高度二次非線性光學效應之有機金屬 化合物.相對應於未配位的有機分子,有機金屬 化合物應擁有較佳的二次非線性光學活性.具 有金屬對配位基電子轉移之激態(MLCT)的有機金屬,譬如株[4-CH/sub 3/-4'-X-bipy�O]/sub 3/L]/sup n+/bipy=2,2'-bipyridine>,乃是本計畫首要的研究對象, 其中X代表含有高度極化之.pi.-共軛電子的側鏈 .電場誘導二次諧波效應狠ISH詵1測量將提供這 類有機金屬化合物,其分子結構與非線性光學 性質的關連性,這些結果將有助於設計最佳非 線性光學活性的發色團.
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    Enhancing the electrocatalytic water splitting efficiency for amorphous MoSx
    (2014-03-26)
    Hsu, Chang-Lung
    ;
    Chang, Yung-Huang
    ;
    Chen, Tzu-Yin
    ;
    Tseng, Chien-Chih
    ;
    Wei, Kung-Hwa
    Amorphous molybdenum sulfide (MoSx) materials have been considered as cheap and promising catalysts for hydrogen evolution reaction (HER). In this contribution, we report that the amorphous MoSx catalysts prepared by the low temperature thermolysis of the (NH4)(2)MoS4 precursors on carbon clothes (catalyst loading: 3.2 mg/cm(2)) exhibit a Tefal slope of 50.5 mV/dec and a high exchange current density of 1.5 x 10(-3) mA/cm(2) in 0.5 M H2SO4 solutions. Spectroscopic studies of the amorphous MoSx catalysts show that the increase of HER efficiency is positively correlated to the concentration of S-2(2-) species, providing strong evidence to support the argument that S-2(2-) is an active species for electrocatalytic HER. Additionally, the method for preparing catalysts is simple, scalable and applicable for large-scale production. Copyright (C) 2014, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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    Comparative study on MoS2 and WS2 for electrocatalytic water splitting
    (2013-09-19)
    Chen, Tzu-Yin
    ;
    Chang, Yung-Huang
    ;
    Hsu, Chang-Lung
    ;
    Wei, Kung-Hwa
    ;
    Chiang, Chia-Ying
    Replacing Pt by earth abundant catalysts is one of the most important tasks toward potential large-scale HER applications. Among many potential candidates, low cost and earth abundant transition metal dichalcogenides such as MoS2 and WS2 have been promising as good H-2 evolution electrocatalysts when they are engineered into the structures with active sites. In this work, we have performed systematic studies on the catalytic reactivity of both MoS2 and WS2 materials produced by one-step and scalable thermolysis from (NH4)(2)WS4 and (NH4)(2)MoS4 precursors respectively. Structural analysis shows that these materials prepared at a higher thermolysis temperature exhibit higher crystallinity. The H-2 evolution electrocatalysts efficiency for the MoS2 prepared at a lower temperature is higher than those at higher temperatures, where amorphous MoS2 or S-2(2-) species instead of crystalline MoS2 is the main active site. By contrast, crystalline WS2 prepared at high temperature is identified to be the key reaction site. Both catalysts display excellent efficiency and durability as an electrocatalyst operating in acidic electrolytes. This work provides fundamental insights for further design and preparation of emergent metal dichalcogenide catalysts, beneficial for the development in clean energy. Copyright (C) 2013, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.