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一、干电池常用干电池是用锌板围成的圆筒作负极,石墨粉和二氧化锰包围在碳棒的周围并压成圆柱作正极,内充糊状的 ZrCl_2和 NH_4Cl。电极反应为:负极:Zn-2e=Zn~(2+)、正极:2NH_4~++2e=2NH_3↑+H_2↑,H_2被MnO_2吸收,反应式为:H_2+MnO_2=Mn_2O3+H_2O。电池总反应式为:Zn+2NH_4Cl+MnO+_2=ZnCl_2+2NH_3↑+Mn_2O_3+H_2O,这种电池电压通常约为1.5伏,不能充电再生。
A dry battery commonly used dry battery is a cylinder surrounded by a zinc plate as a negative electrode, graphite powder and manganese dioxide surrounded around the carbon rod and pressed into a cylinder for the positive electrode, filled with paste like ZrCl_2 and NH_4Cl. The electrode reactions were as follows: negative electrode: Zn-2e=Zn2+, positive electrode: 2NH_4~++2e=2NH3+H2O, H2 absorbed by MnO2, and the reaction formula was: H2+MnO2=Mn2O3+H2O. The battery’s total reaction formula is: Zn+2NH_4Cl+MnO+2=ZnCl2+2+NH3+H+Mn2O3+H2O. This battery voltage is usually about 1.5 volts and cannot be regenerated by charging.