共查询到18条相似文献,搜索用时 531 毫秒
1.
用循环伏安法研究了在不同pH水溶液中在四苯基铁、钴和锰卟啉化学修饰玻碳电极上氧还原反应的电催化行为。用旋转圆盘电极测定了在四苯基铁卟啉修饰玻碳电极上氧的电催化反应的速率常数。提出了氧的电催化还原反应的历程。 相似文献
2.
3.
在玻碳电极上采用吸附法制备了四溴代酞菁钴(CoPcBr4)、酞菁钴(CoPc)和四-α-(2,2,4-三甲基-3-戊氧基)酞菁钴(CoPc(OC8H17)4)修饰电极。利用循环伏安法和线性扫描伏安法研究了修饰电极在酸性介质中对分子氧的电催化还原,比较了不同取代基的酞菁钴对电催化性质的影响。结果表明,它们对分子氧还原均具有良好的电催化活性,其中酞菁钴和四-α-(2,2,4-三甲基-3-戊氧基)酞菁钴对O2的催化是2电子还原生成H2O2,与裸电极相比,O2的还原峰电位分别向正方向移动了0.33和0.48 V。而四溴代酞菁钴修饰电极在-0.1和-0.7 V附近产生的2个还原峰,说明它催化O2到H2O2的还原以后还可以促进H2O2继续还原到H2O,最终实现O2的4电子还原。 相似文献
4.
亚硫酰氯阴极还原的半对数极化曲线 总被引:1,自引:0,他引:1
目前正在广泛研究的鲤/亚硫酰氯(Li/SOCl_2)电池是迄今为止比能量最高的一种新型化学电源。提高电池的性能和可靠性与电池反应的化学和电化学性质直接有关。但是,SOCl_2的还原过程相当复杂,对其反应机理迄今尚无明确的结论。由于SOCl_2还原时伴随着LiCl的沉积,当用常规电极测量时难以得到稳态极化曲线,因而至今未见报道SOCl_2还原反应的半对数极化曲线。微电极的单位表面上极限液相传质速度较高,且测量时较易得到稳态电流。因此,采用微电极方法可在一定程度上避开上述困难,研究SOCl_2还原反应的机理。 相似文献
5.
研究了四对甲氧基苯基金属卟啉配合物对SOCl2还原反应的电催化行为.实验结果表明,金属卟啉配合物对SOCl2还原反应有较好的电催化活性,不同中心离子配合物的活性顺序是Fe2+≈Co2+>Ni2+.这类配合物能阻止反应产物LiCl在电极表面沉积,增大电池放电容量. 相似文献
6.
7.
综述了酞菁配合物、卟啉配合物、席夫碱配合物等作为Li/SOCl2电池添加剂的研究进展,介绍了这些添加剂对碳表面的SOCl2还原反应的催化机理和效果,并对今后的研究目标进行了展望. 相似文献
8.
9.
过渡金属酞菁具有很高的氧还原催化活性, MnO2对氧还原反应有催化作用,但是将过渡金属酞菁和MnO2作为氧还原反应的双催化剂的研究较少。 本文采用苯酐-尿素法合成了碳纳米管(CNT)负载四硝基金属酞菁(TNMPc)组装体,联合γ-MnO2作为氧还原反应的双催化剂。 借助循环伏安法对双催化剂的配比进行优化,得到二者的最佳比例。 研究了四硝基金属酞菁的中心金属离子对最佳比例双催化剂催化性能的影响和双催化剂的抗甲醇性能,结果表明,双催化剂对氧还原反应的催化能力主要受到金属离子本性的影响,双催化剂对氧还原反应的催化效率顺序为CNT/TNFePc-MnO2>CNT/TNCoPc-MnO2>CNT/TNNiPc-MnO2>CNT/TNCuPc-MnO2;4种双催化剂均具有较好的抗甲醇中毒性能。 相似文献
10.
乙醇对双核酞菁钴掺杂聚苯胺膜修饰电极特性的影响 总被引:2,自引:1,他引:1
研究了乙醇对双核酞菁钴(b i-CoPc)掺杂聚苯胺(PAn)膜修饰电极特性的影响。用循环伏安法(CV)考察了乙醇浓度不同时,玻碳电极(GC)上双核酞菁钴掺杂聚苯胺的电聚合过程,用紫外-可见吸收光谱(UV-V is)、红外光谱(FTIR)和扫描电子显微镜(SEM)表征了在氧化铟锡玻璃(ITO)电极上b i-CoPc掺杂的PAn膜,研究了乙醇对膜以及该膜修饰电极对溶液中分子氧电催化性能的影响。结果表明,乙醇对苯胺的电聚合有促进作用,有助于增加b i-CoPc掺杂量,膜的光谱特性发生变化,表面形貌更加均匀。乙醇存在下制备的修饰电极对溶液中分子氧的电催化活性明显提高。当乙醇含量为10%时,制备的电极催化能力最强。 相似文献
11.
12.
采用微波法合成了双核酞菁钴,并采用红外光谱、紫外可见光谱、热重分析对其进行表征。以二苯并噻吩(DBT)为反应底物,考察双核酞菁钴对DBT催化氧化性能,筛选出较优催化剂,并进行脱硫反应工艺条件优化。结果表明,双核酞菁钴具有较好的催化性能,在室温下、双核酞菁钴用量为0.01 g(cat)/5 m L、空气流量为80 m L/min、反应温度为40℃、反应1 h,DBT脱硫率达到97.17%。催化剂重复使用5次,催化效果无明显下降。氧化产物经红外光谱、质谱分析为DBTO2。对芳香烃及烯烃进行了催化氧化实验,发现该工艺对油品的质量基本无影响。 相似文献
13.
直接甲醇燃料电池的耐甲醇阴极电催化剂炭载四羧基酞菁钴的研究 总被引:5,自引:0,他引:5
比较了甲醇对Pt/C和炭载四羧基酞菁钴(CoPcTc/C)催化氧还原性能的影响.结果表明,甲醇使Pt/C催化氧还原的性能严重降低,而对经800℃热处理的CoPcTc/C(CoPcTc/C-800)基本没有影响;并且CoPcTc/C-800催化氧还原的性能优于经其它温度热处理的CoPcTc/C,CoPcTc/C-800是一种较好的直接甲醇燃料电池的耐甲醇阴极电催化剂.XPS结果表明,CoPcTc/C-800的活性位可能是含CoN4结构的物质和零价Co的混合物. 相似文献
14.
Iodine‐Doped Cobalt Phthalocyanine Supported on Multiwalled Carbon Nanotubes for Electrocatalysis of Oxygen Reduction Reaction 下载免费PDF全文
4‐(4,6‐Diaminopyrimidin‐2‐ylthio) phthalocyaninatocobalt(II) (CoPyPc) was iodine doped, and its electrocatalytic properties explored. Physical characterization techniques such as UV‐vis, X‐ray photoelectron, electron paramagnetic resonance and infra‐red spectroscopy were used. Cyclic voltammetry, electrochemical impedance spectroscopy and rotating disk electrode were used for electrochemical characterization of electrodes modified with the prepared phthalocyanine and its nanocomposites. The electrocatalytic effect of a new iodine‐doped cobalt phthalocyanine derivative supported on multiwalled carbon nanotubes was then investigated towards oxygen reduction reaction. The electrocatalytic activity of the iodine‐doped cobalt phthalocyanine was found to be superior in terms of current over the undoped phthalocyanine nanocomposite. 相似文献
15.
Three novel series of the binuclear metal phthalocyanines M2Pc2, M2Pc2Hc, and M2Nc2 (M?=?Mn(II), Fe(II), Co(II), Ni(II), and Cu(II)) were synthesized and characterized. The electrocatalytic performance of the binuclear compounds to lithium–thionyl chloride battery was evaluated by operating these compounds in the electrolyte of the battery. The results indicated that the binuclear metal phthalocyanines improved the capacity of the battery by an increase of approximately 30–58 %. Of all, Cu2Pc2Hc and Fe2Nc2 displayed the highest increments of 56 and 57 %, respectively. 相似文献
16.
Xin Chen Mengke Li Zongxue Yu Qiang Ke 《Russian Journal of Physical Chemistry A, Focus on Chemistry》2016,90(12):2413-2417
The oxygen reduction reaction (ORR) catalyzed by mononuclear and planar binuclear cobalt (CoPc) and iron phthalocyanine (FePc) catalysts is investigated in detail by density functional theory (DFT) methods. The calculation results indicate that the ORR activity of Fe-based Pcs is much higher than that of Co-based Pcs, which is due to the fact that the former could catalyze 4e- ORRs, while the latter could catalyze only 2e- ORRs from O2 to H2O2. The original high activities of Fe-based Pcs could be attributed to their high energy level of the highest occupied molecular orbital (HOMO), which could lead to the stronger adsorption energy between catalysts and ORR species. Nevertheless, the HOMO of Co-based Pcs is the ring orbital, not the 3d Co orbital, thereby inhibiting the electron transfer from metal to adsorbates. Furthermore, compared with mononuclear FePc, the planar binuclear FePc has more stable structure in acidic medium and more suitable adsorption energy of ORR species, making it a promising non-precious electrocatalyst for ORR. 相似文献
17.
18.
The introduction of amino groups on HNO3-treated microporous (AC(micro)-At) and mesoporous (AC(meso)-At) activated carbon, which was followed by thionyl chloride (SOCl2) treatment, by immobilization of diamine compounds was investigated in terms of change in pore characteristics. The immobilization was improved by treatment with SOCl2. The BET surface area of AC(micro)-At largely decreased by immobilization of ethylenediamine (EDA) and hexamethylenediamine (HMDA). Decreases in BET surface area and pore volume of AC(meso)-At by immobilization of EDA and HMDA were scarcely observed. These results suggest that amino groups introduced to mesoporous activated carbon are effective as functional groups for additional reactions. 相似文献