1.3.3 工作电极制备在玛瑙研钵中将MnO2/PPy(或MnO2)，

1.3.3 Preparation of the working electrode <br>in an agate mortar MnO2 / PPy (or of MnO2), acetylene black, a binder (PVDF) mass fraction of 7: 2: 1 ratio mixed, coated on a foamed nickel 1 cm2 current collector, dried in an oven at 75 deg.] C in 4 h, tabletting to prepare a working electrode, stored in ziplock, a spare.

1.3.3 Working electrode preparation<br>MnO2/PPy (or MnO2), acetylene black, binder (PVDF) mixed evenly in a quality score of 7:2:1, coated on a 1 cm2 foam nickel set fluid, dried 4 h in a drying chamber at 75 degrees C, pressed tablets, made working electrodes, stored in self-sealed bags, spare.

1.3.3 preparation of working electrode<br>In the agate mortar, MnO2/PPy (or MnO2), acetylene black, and binder (PVDF) were mixed evenly according to the mass fraction of 7:2:1, coated on 1 cm2 foam nickel fluid, drying at 4 degrees in a drying oven at 75 degrees Celsius, pressing the tablets, making working electrodes and storing them in self sealing bags.<br>