The original battery is not necessary to form the electrode potential? Why can we use graphite as electrode only? No potential difference.
Indeed, the original battery electrode potential using two different electrodes, produce potential difference, so that the electron flow generated current. Graphite is used as an electrode because of its excellent electrical conductivity and stability
External electronic wire and the directional movement of ions in the solution of the directional movement between the poles of a closed loop, so that the two electrode reaction, electron transfer process, ordered a current converting chemical energy to electrical energy.Attention, here, "the ion does not go ashore, the electron does not enter the water"." That is the external circuit of graphite electrode is composed of electron flow and electrolyte ion flow; graphite electrode is to produce voltage and electrolyte, and to provide or absorb electrons
A galvanic cell is a device that converts chemical energy into electrical energy. Electron transfer not by oxidizing and reducing agents to complete the effective collision between, but the reducing agent loss electron oxidation reaction occurs in the anode, the electron transport to the anode through the external circuit, the oxidant to the anode electron reduction reaction, so as to complete the transfer of reductant and oxidant electrons.
