double-layer current
The non-faradaic current associated with the charging of the electrical double layer at an electrode-solution interface, given by: \[i_{\mathrm{DL}}=\frac{\mathrm{d}(\sigma \ A)}{\mathrm{d}t}\] where σ = surface charge density of the double layer, A = area of the electrode-solution interface and t = time. Capital letters should be used as subscripts to avoid the possibility of confusing this symbol with that for the limiting diffusion current.
PAC, 1985, 57, 1491. 'Recommended terms, symbols, and definitions for electroanalytical chemistry (Recommendations 1985)' on page 1496 (