Ni-Cr-Co氧化物纳米催化剂对甲醇阳极氧化的电催化性能研究

Synthesis of Ni-Cr-Co Nano-oxides as Anode Electrocatalysts for Methanol Oxidation

摘要:

采用了热分解法合成Ni-Cr-Co氧化物纳米粒子，并用作直接甲醇燃料电池（DMFC）的阳极电催化剂。通过X射线衍射（XRD）、透射电子显微镜（TEM）和扫描电子显微镜（SEM）对催化剂进行表征，制得的纳米催化剂均匀分散，且粒径为25-50 nm。利用循环伏安法（CV）对不同金属摩尔比和焙烧温度下的催化剂在甲醇氧化反应的活性进行了研究。结果表明，Ni-Cr-Co（摩尔配比为1:1:1.5）的纳米氧化物对甲醇氧化反应的起始电位、峰值氧化电流密度和If/Ib分别为0.38 V，19.3 mA/cm2 和1.72，表现了很好的电催化性能。

Abstract:

NiCrCo nano oxides have been synthesized by thermal decomposition method and were used as the anode electrocatalysts for direct methanol fuel cell (DMFC). The catalysts were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the particle size of nano oxides was about 20-50 nm, and the material dispersed uniformly. The activity of catalysts with different metal molar ratios and calcination temperatures on the methanol oxidation reaction were investigated by cyclic voltammetry (CV). The optimal content of the Ni:Cr:Co ratio is found to be 1:1:1.5, which exhibits significantly high current density of methanol oxidation. And the onset potential ,current density and If/Ib for methanol oxidation was 0.38 V, 19.3 mA/cm2 and 1.72, respectively. Results show that the prepared NiCrCo nano oxides electrode presents high electrocatalytic activity for methanol oxidation.NiCrCo nano oxides have been synthesized by thermal decomposition method and were used as the anode electrocatalysts for direct methanol fuel cell (DMFC). The catalysts were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the particle size of nano oxides was about 20-50 nm, and the material dispersed uniformly. The activity of catalysts with different metal molar ratios and calcination temperatures on the methanol oxidation reaction were investigated by cyclic voltammetry (CV). The optimal content of the Ni:Cr:Co ratio is found to be 1:1:1.5, which exhibits significantly high current density of methanol oxidation. And the onset potential ,current density and If/Ib for methanol oxidation was 0.38 V, 19.3 mA/cm2 and 1.72, respectively. Results show that the prepared NiCrCo nano oxides electrode presents high electrocatalytic activity for methanol oxidation.