Bou-Saleh Ziad, Omanovic Sasha
Department of Chemical Engineering, McGill University, Montreal, Quebec, H3A 2B2, Canada.
J Nanosci Nanotechnol. 2009 Apr;9(4):2469-79. doi: 10.1166/jnn.2009.se43.
Electrocatalytic activity of three-dimensional nickel-based layers in the hydrogen evolution reaction (HER) was investigated in an acidic medium. It was demonstrated that patterning of a glassy carbon electrode substrate with a 3D polyaniline (PANI) matrix is a convenient way of increasing the electrocatalytically active surface area of electrodeposited Ni, and hence its apparent electrocatalytic activity. The optimized PANI/Ni electrocatalyst layer showed a significantly higher activity in the HER then a two-dimensional control Ni-plate surface. It was also demonstrated that it is possible to produce a Ni-based HER electrocatalyst layer by synthesizing Ni nanoparticles and supporting them on Vulcan carbon. This electrocatalyst also offered a significantly higher electrocatalytic activity in the HER then the control surface, but lower then the optimized PANI/Ni electrocatalyst. The electrocatalytic activity of the optimized PANI/Ni layer was also compared to the activity of a 3D catalyst produced by coating a porous RVC cube substrate with Ni. This electrocatalyst showed the highest HER electrocatalytic activity among the investigated layers when tested under potentiodynamic polarization conditions. However, under the potentiostatic conditions, the optimized PANI/Ni layer showed the highest electrocatalytic activity.
在酸性介质中研究了三维镍基层在析氢反应（HER）中的电催化活性。结果表明，用三维聚苯胺（PANI）基质对玻碳电极基底进行图案化处理是增加电沉积镍的电催化活性表面积的便捷方法，从而提高其表观电催化活性。优化后的PANI/Ni电催化剂层在HER中的活性明显高于二维对照镍板表面。还证明了通过合成镍纳米颗粒并将其负载在炭黑上可以制备基于镍的HER电催化剂层。这种电催化剂在HER中的电催化活性也明显高于对照表面，但低于优化后的PANI/Ni电催化剂。还将优化后的PANI/Ni层的电催化活性与通过用镍涂覆多孔RVC立方体基底制备的三维催化剂的活性进行了比较。在动电位极化条件下测试时，这种电催化剂在所研究的层中显示出最高的HER电催化活性。然而，在恒电位条件下，优化后的PANI/Ni层显示出最高的电催化活性。
