This is also the case in an electrolytic cell. When the cell is being charged, the anode becomes the positive (+) and the cathode the negative (−) electrode. The cell can be discharged but not recharged.Ī secondary cell, for example a rechargeable battery, is a cell in which the chemical reactions are reversible. The anode is always the negative electrode. A bipolar electrode is an electrode that functions as the anode of one cell and the cathode of another cell.Ī primary cell is a special type of electrochemical cell in which the reaction cannot be reversed, and the identities of the anode and cathode are therefore fixed.
Each electrode may become either the anode or the cathode depending on the direction of current through the cell. The anode is now defined as the electrode at which electrons leave the cell and oxidation occurs (indicated by a minus symbol, "−"), and the cathode as the electrode at which electrons enter the cell and reduction occurs (indicated by a plus symbol, "+"). An electrode in an electrochemical cell is referred to as either an anode or a cathode (words that were coined by William Whewell at Faraday's request).
0 kommentar(er)
