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À©É¢µç×è£¬×¨Öø»òÕ߽̿ÆÊéÉϽÐŨ²î×迹¡£Í¨Ë×Ò»µã½²¾ÍÊÇÖ¸»îÐÔÎïÖÊ(·´Ó¦Îï»òÕßÉú³ÉÎï)¶Ôµç¼«·´Ó¦Ôì³ÉÔÚ×è°£¨¼°×迹£©¡£ Ũ²îÀ©É¢×迹Óеç×èZ(R)ºÍµçÈÝ Z(C£©×é³É¡£ Zw=Z(R)+ Z(C£©=Rw - (1/¦ØC)j Zw¼´Í¨³£Ëù˵µÄWarburg×迹£¬ÆäÖÐZ(R)=¦Ò/[¦Ø(1/2)]£¬Z(C)=1/[¦Ò*¦Ø(1/2)] ¦ÒÊÇWarburgϵÊý¡£ ÔÚEISͼÆ×µÄ¸´Æ½ÃæÖУ¬Warburg×迹ÊÇÓëʵÖá³É45¡ã½ÇµÄÖ±Ïߣ¬×迹´óСÓëÆµÂÊÓйء£ Ó¢ÎĵĽâÊÍÈçÏ£º The Warburg diffusion element is a common diffusion circuit element that can be used to model semi-infinite linear diffusion, that is, unrestricted diffusion to a large planar electrode. A Warburg impedance element can be difficult to recognize because it is nearly always associated with a charge-transfer resistance (see charge transfer complex) and a double layer capacitance (see double layer (interfacial)), but is common in many systems. The Warburg diffusion element (ZW) is a constant phase element (CPE), with a constant phase of 45¡ã (phase independent of frequency) and with a magnitude inversely proportional to the square root of the frequency by: Zw=¦Ò(1-j)/[¦Ø(1/2)] |Zw|=¦Ò*[2(1/2)]/[¦Ø(1/2)] where ¦Ò is the Warburg coefficient (or Warburg constant), j is the imaginary number and ¦Ø is the angular frequency. The presence of the Warburg element can be recognised if a linear relationship on the log of a Bode plot (log|Z| versus log(w)) exists with a slope of value ¨C1/2. |

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ngwang
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