Effect of tunnel structure on the specific capacitance of etched aluminum foil
来源期刊：International Journal of Minerals Metallurgy and Materials2014年第10期
论文作者：Ning Peng Li-Bo Liang Ye-Dong He Hong-Zhou Song Xiao-Fei Yang Xiao-Yu Cai
文章页码：974 - 979
摘 要：The morphology of etched aluminum foil was observed using scanning electron microscopy, which led to the establishment of a cylindrical model and two merged models, considering the fixed weight loss of etching. The maximum of specific capacitance and the corresponding optimum values for tunnel sizes at various anodization voltages were predicted. The increased size distribution and taper of tunnels were demonstrated to decrease the specific capacitance, whereas the addition of polymeric additive into the tunnel widening solution was demonstrated to increase the capacitance. The formation of merged tunnels on the etched aluminum surface, irrespective of the presence of row-merged tunnels or cluster-merged tunnels, resulted in a dramatic decrease in the specific capacitance. It is concluded that, enhancing the uniformity of tunnel size and distribution and avoiding the formation of merged tunnels are the effective approach to achieving the higher capacitance for the tunnel etched and formed aluminum foil.
Ning Peng1，Li-Bo Liang1，Ye-Dong He1，Hong-Zhou Song2，Xiao-Fei Yang2，Xiao-Yu Cai2
1. Beijing Key Laboratory for Corrosion, Erosion and Surface Technology, University of Science and Technology Beijing2. Institute of Technology Research and Development of Electronic Aluminum Foil, Guangxi Hezhou Guidong Electronics Technology Co., Ltd.
摘 要：The morphology of etched aluminum foil was observed using scanning electron microscopy, which led to the establishment of a cylindrical model and two merged models, considering the fixed weight loss of etching. The maximum of specific capacitance and the corresponding optimum values for tunnel sizes at various anodization voltages were predicted. The increased size distribution and taper of tunnels were demonstrated to decrease the specific capacitance, whereas the addition of polymeric additive into the tunnel widening solution was demonstrated to increase the capacitance. The formation of merged tunnels on the etched aluminum surface, irrespective of the presence of row-merged tunnels or cluster-merged tunnels, resulted in a dramatic decrease in the specific capacitance. It is concluded that, enhancing the uniformity of tunnel size and distribution and avoiding the formation of merged tunnels are the effective approach to achieving the higher capacitance for the tunnel etched and formed aluminum foil.
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