Electrocatalytic activity of Vulcan-XC-72 supported Pd, Rh and PdxRhy toward HOR and ORR
Electrocatalytic activity of Vulcan-XC-72 supported Pd, Rh and PdxRhy toward HOR and ORR
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DOI：
10.1016/j.apcatb.2015.03.002
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发表时间：
2015-09
影响因子：
22.1
通讯作者：
F. Tzorbatzoglou;A. Brouzgou;P. Tsiakaras
中科院分区：
文献类型：
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作者：
F. Tzorbatzoglou;A. Brouzgou;P. Tsiakaras
采用改进的脉冲-微波辅助多元醇合成方法制备了碳负载(Vulcan XC-72)Pd、Rh和PdxRhy(20wt%，x：y=1：1，3：1，1：3)电催化剂，考察了它们对氢电氧化(HOR)和氧还原(ORR)反应的电催化活性，并用透射电子显微镜和X射线衍射仪对所制备的电催化剂进行了物化表征。用循环伏安法、转盘电极和计时电流法对其进行了电化学表征，结果表明，PdRh3具有最高的HOR(ik=27.6 mA·cm−2)和ORR(ik=95.20 mA·cm−2)电催化活性。实验还发现，即使加入少量的Rh(Pd3Rh-2.7g·μg·cm−2)也能使Pd的HOR和ORR电催化活性分别提高33%和53%.对于所制备的电催化剂，其HOR活性顺序为：PdRh3≈PdRh；PdRh；Gt；Rh；Pd3Rh；Pd3Rh；Gt；Pd3Rh；Gt；PdRh；PdRh；Gt；PdRh；Pd3Rh；Gt；Pd3Rh；Gt；Pd。
Carbon-supported (Vulcan XC-72) Pd, Rh, and PdxRhy(20 wt%,x:y= 1:1, 3:1, 1:3) electrocatalysts are prepared according a modified pulse-microwave assisted polyol synthesis method and their electrocatalytic activity toward hydrogen electrooxidation (HOR) and oxygen reduction (ORR) reactions is investigated.The as-prepared electrocatalysts are physicochemically characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). Their electrochemical characterization is carried out by the aid of cyclic voltammetry (CV), rotating disk electrode (RDE) and chronoamperometry (CA) techniques.It is found that among the as-prepared catalysts, PdRh3exhibits the highest HOR (ik= 7.6 mA cm−2) and ORR (ik= 5.20 mA cm−2) electrocatalytic activity. It is also found that the addition even of small amount of Rh (Pd3Rh-2.7 μg cm−2) enhances both Pd’s HOR and ORR electrocatalytic activity by 33% and by 53%, respectively.For the as prepared electrocatalysts, the HOR activity order, in terms of kinetic current density, is found to be as follows: PdRh3≈ PdRh > Rh > Pd3Rh > Pd, while a similar trend was found for ORR activity: PdRh3> PdRh > Rh > Pd3Rh > Pd.