Highly loaded carbon black supported Pt catalysts for fuel cells
Highly loaded carbon black supported Pt catalysts for fuel cells
复制标题
DOI：
10.1016/j.cattod.2015.02.016
复制
发表时间：
2015-11
期刊：
影响因子：
5.3
通讯作者：
L. Kaluža;M. J. Larsen;M. Zdražil;D. Gulková;Z. Vít;O. Šolcová;K. Soukup;M. Koštejn;J. Bonde
中科院分区：
文献类型：
--
作者：
L. Kaluža;M. J. Larsen;M. Zdražil;D. Gulková;Z. Vít;O. Šolcová;K. Soukup;M. Koštejn;J. Bonde
研究了商用高比表面积炭黑(808m2g−1)、低比表面积炭黑(226m2g−1)和实验级中比表面积炭黑(ExpCB，384m2g−1)作为铂沉积的载体：(I)从H_2PtCl6、铂(C5H7O2)2、铂(NH_3)4(NO_3)2或铂(NH_3)2(NO_2)_2的真实溶液中，以及(Ii)从铂(C_5H_7O_2)_2或PtO_2的细浆中获得高铂负载量。程序升温还原(TPR)结果表明，在0、70、120、140、150℃时，沉积在炭黑上的PtO2、H2PtCl6、Pt(C5H7O2)2、Pt(NH3)4(NO3)2和Pt(NH3)2(NO2)2分别被还原为金属铂。在旋转圆盘电极(RDE)上，对选定的催化剂材料制备的电极进行了循环伏安(CV)测试。通过RDE测定了铂的电化学活性表面积(ESA)和对氧还原反应(ORR)的电催化活性，并考察了其对电化学老化的稳定性。这些分析表明，在所研究的催化剂合成方法中，用H_2PtCl6浸渍是最合适的。获得了与工业参考催化剂相近的质量比ORR活性。以碳ExpCB为载体制备的催化剂比以350G为载体制备的催化剂具有更高的稳定性。催化剂的脱氯进一步提高了稳定性。
A commercial high surface area carbon black (808 m2g−1), low surface area carbon black (226 m2g−1) and an experimental grade medium surface area carbon black (ExpCB, 384 m2g−1) were studied as supports for platinum deposition: (i) from true solutions of H2PtCl6, Pt(C5H7O2)2, Pt(NH3)4(NO3)2, or Pt(NH3)2(NO2)2, and (ii) from fine slurries of Pt(C5H7O2)2or PtO2to achieve high Pt loadings of 60 wt.%. Temperature programmed reduction (TPR) revealed that PtO2, H2PtCl6, Pt(C5H7O2)2, Pt(NH3)4(NO3)2, and Pt(NH3)2(NO2)2deposited on carbon blacks were reduced to metallic Pt at 0, 70, 120, 140, 150 °C, respectively. Cyclic voltammetry (CV) was carried out on electrodes prepared from selected catalyst materials on a rotating-disc electrode (RDE). The electrochemically active surface area (ESA) of the platinum and electrocatalytic activities towards the oxygen-reduction reaction (ORR) were evaluated from the RDE measurements, in which also the stability towards electrochemical ageing was investigated. These analyses indicated that impregnation by H2PtCl6is the most suitable of the studied catalyst synthesis methods. Mass-specific ORR activities similar to that of commercial reference catalyst are obtained. Catalysts prepared on carbon ExpCB showed greater stability than those based on 350G. Further increase in stability results from dechlorination of the catalyst.