Mittermeier Thomas, Madkikar Pankaj, Wang Xiaodong, Gasteiger Hubert A, Piana Michele
Department of Chemistry and Catalysis Research Center, Technical University of Munich, Lichtenbergstr. 4, D-85748 Garching, Germany.
Johnson Matthey Catalysts (Germany) GmbH, Bahnhofstr. 43, D-96257 Redwitz, Germany.
Materials (Basel). 2017 Jun 16;10(6):661. doi: 10.3390/ma10060661.
In this experimental study, we investigate various transition-metal silicides as platinum-group-metal-(PGM)-free electrocatalysts for the hydrogen oxidation reaction (HOR), and for the hydrogen evolution reaction (HER) in acidic environment for the first time. Using cyclic voltammetry in 0.1 M HClO₄, we first demonstrate that the tested materials exhibit sufficient stability against dissolution in the relevant potential window. Further, we determine the HOR and HER activities for Mo, W, Ta, Ni and Mo-Ni silicides in rotating disk electrode experiments. In conclusion, for the HOR only Ni₂Si shows limited activity, and the HER activity of the investigated silicides is considerably lower compared to other PGM-free HER catalysts reported in the literature.
在本实验研究中，我们首次研究了各种过渡金属硅化物作为无铂族金属（PGM）的电催化剂，用于酸性环境中的氢氧化反应（HOR）和析氢反应（HER）。在0.1 M高氯酸中使用循环伏安法，我们首先证明了测试材料在相关电位窗口中对溶解具有足够的稳定性。此外，我们在旋转圆盘电极实验中测定了Mo、W、Ta、Ni和Mo-Ni硅化物的HOR和HER活性。总之，对于HOR，只有Ni₂Si表现出有限的活性，并且与文献中报道的其他无PGM的HER催化剂相比，所研究硅化物的HER活性要低得多。
