固相反应制备的Pt/C催化剂对乙醇氧化的电催化活性

用固相反应法制备了Pt/C催化剂(Pt/C(s)),并研究了该催化剂对乙醇氧化的电催化活性。XRD和TEM测量表明,Pt/C(s)中Pt的平均粒径为3.8nm,结晶度为2.38,远小于用传统的液相还原方法制得的Pt/C催化剂(Pt/C(1))的平均粒径(8.5nm)和结晶度(5.56)。因此,Pt/C(s)对乙醇的电催化氧化性能远好于液相还原法制得的Pt/C(1)。

胶态Pt/C催化剂对甲醇的电催化氧化性能

研究了Pt金属载量为20%的碳载胶态Pt金属催化剂对甲醇的电催化氧化性能,并与E TEK公司同类型催化剂进行了比较。X衍射光谱(XRD)和透射电镜(TEM)研究显示在胶态Pt/C催化剂中,Pt粒子的平均粒径为3.8nm,并且具有良好的均一度。电化学研究显示:尽管胶态Pt/C催化剂拥有相对较小的电化学活性面积,但对甲醇的电催化氧化性能却明显优于E TEK公司的Pt/C催化剂,其原因应归结于利用有机溶胶法制得的胶态Pt/C催化剂拥有更合理的平均粒径。

PEMFC催化剂的研究:自制Pt/C电催化剂的性质

研究了一种用于质子交换膜燃料电池(PEMFC)的自制Pt/C电催化剂(标记为THYT-1)的物理化学和电化学性质.将THYT-1电催化剂与E-TEK公司的同类电催化剂的组成、形态及电催化性能进行了比较.单电池测试结果显示,THYT-1的电催化性能优于E-TEK电催化剂.CV测试结果表明CO在这两种电催化剂上的电氧化性能相近;TEM分析表明两种催化剂上Pt晶粒在炭载体上呈均匀分布,平均粒径均为2～3nm;XPS和XRD测试结果表明两种催化剂中Pt主要以金属态存在.这些数据表明THYT-1催化剂的物理化学性质与E-TEK公司的相类似.

PEMFC催化剂的研究:自制抗CO中毒Pt-Ru/C电催化剂的性质

用胶体法制备了抗CO中毒PEMFC阳极Pt Ru/C电催化剂 (标记为THYT 2 ),对比研究了THYT 2与JohnsonMatthey(JM)公司同类品牌Pt Ru/C催化剂的电化学及其它物理化学性能 .结果表明 ,THYT 2电催化剂在甲醇燃料电池和CO/H2(ΦCO=1× 10 -4)的氢氧燃料电池中的电催化行为与JM催化剂相当,但THYT 2在低浓度CO氢气燃料中的电池性能更好 .两种催化剂的其它物理化学性质具有类似性 :XPS分析结果表明THYT 2和JM催化剂中都有三种不同价态的Pt存在 :即金属态Pt(0 )、氧化态Pt(II)和Pt(IV) .HRTEM测试结果表明两种催化剂的粒径处在 2～3nm左右 ,这可能是它们拥有良好电化学性能的主要原因之一 .本文还对催化剂中Pt与Ru组分的分布和相互作用进行了讨论 ,提出了改进Pt Ru/C电催化剂的思路

Methanol tolerant FeTPP-Pt/C Co-catalysts for the electroreduction of oxygen

It was found for the first time that iron tetraphenylporphyrin (FeTPP)-Pt/C showed the good activity for the electroreduction of oxygen and methanol tolerant ability. Their performances were related to the heat-treatment temperature.

Effect of properties of active carbon supports on performance of Pt/C catalysts in polymer electrolyte membrane fuel cell

The Pt/C catalysts were prepared with pine active carbon and Vulcan XC-72 active carbon as the supports. The performances of the Pt/C catalysts in polymer electrolyte membrane fuel cell were compared. The result indicates that the performance of Pt/Vulcan XC-72 is better than that of Pt/pine. The physical and chemical properties of the two active carbons were measured using several analysis techniques. It was found that the pore size, specific conductivity and the surface function group significantly influence the performance of the electrocatalyst.

Electrocatalytic performance of Pt-TiO2/C complex catalysts for oxidation of methanol

It is reported for the first time that the Pt-TiO2/C catalyst prepared with chemical reduction and sol-gel method showed the excellent electrocatalytic activity and stability for the electrooxidation of methanol. When the atom ratio of Ti to Pt in the catalysts is 1/2, the catalysts showed the best electrocatalytic properties. After the catalyst is treated at 500 degreesC, the performance is further improved. It is hopeful to use the catalyst in the pratical DMFC.

Preparation of Pt nanoparticles assembled in multilayer films

PtCl62- anions were assembled on a glassy carbon electrode with [tetrakis(N-methylpyridyl)porphyrinato]cobalt cations through layer-by-layer method. then electrochemically reduced to yield zero valent Pt nanoparticles. Regular growth and surface morphology of the multilayer films were characterized by UV/vis. XPS and AFM.

Performance of Pt-TiO2 electrocatalyst for CO oxidation in the electrochemical gas sensor

It is reported for the first time that the Pt/TiO2 electrocatalyst was successfully used for the electrocatalytic oxidation of CO in the electrochemical gas sensor with a controlled potential mode. The stability of electrocatalytic activity of the Pt-TiO2 electrocatalyst for the CO oxidation is better than that of Pt.

Preparation of Pt/C catalyst with solid phase reaction method

The PVC catalyst was prepared with solid phase reaction method (Pt/C(S)) for the first time. Its performances were compared with that prepared by the traditional liquid phase reaction method. The results demonstrate that the electrocatalytic activity of PVC catalyst with solid phase reaction method for methanol oxidation is higher than that with liquid phase reaction method. XRD and TEM measurements indicate that the Pt/C(S) possesses low crystalline extent and small particle size.

固相反应法制备的Pt/C催化剂对乙醇氧化的电催化活性研究

直接甲醇燃料电池（DMFC）由于具有燃料来源丰富、价格低廉、易于携带储存等优点,近年来一直是世界上许多国家研究和开发的热点[1].但是甲醇具有一定的毒性,因此要想实现DMFC在诸如手机、笔记本电脑以及电动车等可移动电源领域的应用,必须探索寻找新的液体燃料以替代有毒性的甲醇.其中乙醇很易从农作物中大量生产,又无毒,因此很有可能用作为替代甲醇作DMFC的燃料.乙醇的电催化氧化已被众多的研究者从电催化和乙醇燃料电池的角度进行了广泛研究[2-7].其中,对乙醇电催化氧化活性较好的有pt[2-4]、pt-Ru[6-7]、Pt-Pd[5]和Pt-Mo[7]等催化剂.我们研究组报道了用固相反应法制得的Pt催化剂对甲醇氧化的电催化活性要优于用常规液

碳载Pt-TiO_2复合催化剂对甲醇氧化的电催化性能

报道了通过化学还原和溶胶 -凝胶法制备不同组成的 Pt-Ti O2 /C催化剂及其对甲醇的氧化反应 .结果表明 ,该催化剂具有很好的电催化活性和稳定性 .催化剂中的 Ti和 Pt的原子比为 1 /2时 ,催化剂的性能最好 .在 5 0 0℃下热处理后 ,催化剂的性能得到进一步的改善 .这种催化剂有望能在 DMFC中获得实际使用.

FeTPP-Pt/C复合催化剂作为耐甲醇氧还原电催化剂的研究

尽管直接甲醇燃料电池的研究已经进行了三十多年,但是其性能仍被几个问题所限制。其中之一就是甲醇从阳极穿过聚合物电解质膜进入到阴极,降低通常使用的Pt催化剂对氧还原的催化活性。因此寻找同时具有良好的氧还原催化活性和耐甲醇性能的电催化剂就成为一个重要的课题。本文首次报道了具有上述性能的FeTPP-Pt/C复合催化剂。