Zhang Qiang, Chen Ting, Jiang Rongyan, Jiang Fengxing
School of Science, Shandong Jianzhu University Jinan 250101 China.
School of Materials Science and Engineering, Shandong Jianzhu University Jinan 250101 China.
RSC Adv. 2020 Mar 10;10(17):10134-10143. doi: 10.1039/d0ra00483a. eCollection 2020 Mar 6.
In this paper, a comparision of Pt Pd /C catalysts for ethanol-oxidation in acidic and alkaline media has been investigated. We prepared Pt Pd /C catalysts with different ratios of Pt/Pd ( at% = 0, 27, 53, 77 and 100) by the formic acid reduction method. The obtained Pt Pd /C catalysts were characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), induced coupled plasma-atomic emission spectroscopy (ICP-AES), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). Structural and morphological investigations of the as-prepared catalysts revealed that the metallic particle size increases with increasing Pd content in the catalyst. The electrocatalytic performances and stabilities of Pt Pd /C catalysts were tested by cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry (CA) measurements for ethanol oxidation in acidic and alkaline media. The electrochemical measurements demonstrate that Pt Pd /C catalysts exhibit much higher electrocatalytic activity for alcohol oxidation in alkaline media than that in acidic media. The composition of Pt/Pd has a significant impact on the ethanol-oxidation in both acidic and alkaline media. The PtPd/C catalyst shows the highest electrocatalytic performance with a mass specific peak current of 2453.7 mA mg in alkaline media, which is higher than the PtPd/C with the maximum of peak current of 339.7 mA mg in acidic media. Meanwhile, the effect of electrolyte, CHCHOH concentrations and scan rates was also studied for ethanol-oxidation in acidic and alkaline media.
本文研究了用于酸性和碱性介质中乙醇氧化的Pt Pd /C催化剂的比较。我们通过甲酸还原法制备了具有不同Pt/Pd比例（原子百分比=0、27、53、77和100）的Pt Pd /C催化剂。通过X射线衍射（XRD）、能量色散X射线光谱（EDX）、电感耦合等离子体原子发射光谱（ICP-AES）、X射线光电子能谱（XPS）和透射电子显微镜（TEM）对所得的Pt Pd /C催化剂进行了表征。对所制备催化剂的结构和形态研究表明，催化剂中的金属粒径随Pd含量的增加而增大。通过循环伏安法（CV）、线性扫描伏安法（LSV）和计时电流法（CA）测量，测试了Pt Pd /C催化剂在酸性和碱性介质中对乙醇氧化的电催化性能和稳定性。电化学测量表明，Pt Pd /C催化剂在碱性介质中对醇氧化的电催化活性远高于酸性介质。Pt/Pd的组成对酸性和碱性介质中的乙醇氧化都有显著影响。PtPd/C催化剂在碱性介质中表现出最高的电催化性能，质量比峰值电流为2453.7 mA mg，高于酸性介质中峰值电流最大为339.7 mA mg的PtPd/C。同时，还研究了电解质、CHCHOH浓度和扫描速率对酸性和碱性介质中乙醇氧化的影响。
