Current density, cannot be above or below zero. It's a measure of the amount of current flowing per unit area, and the current itself is the flow of charged particles. Here's why:
- Current: Current is the flow of charged particles, typically electrons in conductors. This flow has a direction, but the quantity itself is inherently positive.
- Area: Area is always a positive value.
- Current Density (J): J = I / A (Current divided by Area). Since both current (I) and area (A) are positive quantities, their division (current density) will also be positive.
Non-Faraday current and active area connection:
The active area of the electrode is indeed calculated based on the non-Faraday current. Non-Faraday current refers to current flow that doesn't directly participate in the desired electrochemical reaction. It's often due to phenomena like charging the double-layer capacitance at the electrode surface or side reactions.
Here's how it relates to the active area:
Key takeaway:
While non-Faraday current helps determine the active area, current density itself remains a positive quantity because it reflects the magnitude of current flow per unit area.
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