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Fig. 5 shows the EIS spectra on the Ni-Fe-Co-Mo alloy electrode at various overpotentials (30 wt.%KOH solution at 30¡ãC). As can be seen, the AC impedance in HER increases as the overpotential decreases. For the overpotential being 50, 100, 150, and 200 mV, the impedance was measured as 2.75,1.13, 0.44, and 0.23 ¦¸/cm2, respectively. The electrode¡¯s double layer capacitance Cd can then be calculated as 0.1546 F/cm2. ͼ5¼û¸½¼þ¡£ Âé·³¸÷λ´ó³æ°ïÎÒ¿´¿´£¬²âµÃµç×èÖµºóÈçºÎ¼ÆËã³öË«µç²ãµçÈÝÖµ£¿ ͨ¹ýÉ趨ÄâºÏµç·Çó³öµÄµçÈÝÖµÕýÈ·Â𣿠|
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