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在无添加剂的锌酸盐溶液中镀锌,其阴极反应为Zn(OH)42-+2e→Zn+4OH-,并受扩散步骤控制。18℃时测得某电流密度下的电位为0.056V。若忽略阴极上析出氢气的反应,并已知Zn(OH)42-离子的扩散系数为0.5×10-5cm2/s,浓度为2mol/L,在电极表面液层(x=0处)的浓度梯度为8×10-2mol/cm4,试求:
阴极过电位为0.056V时的阴极电流密度
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
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