膜电极厚度对电极材料析氢活性的影响

用直流磁控溅射法制备不同厚度的膜电极材料.在室温,1mol/L KOH溶液中,这些膜电极材料析氢反应的过电位和膜电极的厚度有关:在一定厚度范围内,膜电极越厚,析氢过电位越小,不同膜电极材料都表现出这样的规律,只是大小和对厚度的依赖程度有所不同.这些结果表明析氢反应不只是发生在电极表面的范围内,反应过程中形成的金属氢化物由于深入到材料内部,从而出现了厚度对析氢反应过电位的影响,并且由于材料不同,可形成的金属氢化物厚度不同,所以对过电位的影响也就不同.

Influence of Thickness of Catalysis Electrode Film on Hydrogen Evolution Reaction Overpotential

The different thickness of HER film electrodes prepared by DC magnetron sputtering device,their overpotential attained at room temperature,1mol/L KOH is related with thickness of the film,the overpotential decreases with increasing of the thickness,although the decreasing degree of different material is varying.All these show that the HER reaction is not happened only on the surface of electrode,the M-H is formed inside the film electrode,and it is related with the characteristic of M-H,so thickness of the film affects the overpotential.