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开发一种在低温电解质(850°C)铝电解中应用的新型二氧化锡基气体阳极以降低铝电解能耗和二氧化碳排放。在此种气体阳极中,氢气通入阳极后参与阳极反应,分别用石墨和铝作阴极和参比电极。采用循环伏安法研究此体系中铂和二氧化锡基电极上氧离子的电化学行为,并确定氧气的析出电势。然后,采用气体电极进行恒电流电解实验,相对于未通入气体和通入氩气,通入氢气后阳极出现明显的去极化现象(阳极电势约下降0.8 V)。实验结果表明,氢气已参与阳极三相界面(气体-电解质-电极)反应,为还原性气体阳极在铝电解上的应用提供了可行性。
Develop a new tin dioxide based gas anode for use in cryogenic electrolyte (850 ° C) aluminum electrolysis to reduce energy consumption and carbon dioxide emissions from electrolysis. In this gas anode, hydrogen is introduced into the anode to participate in the anode reaction, using graphite and aluminum as the cathode and the reference electrode, respectively. Cyclic voltammetry was used to study the electrochemical behavior of oxygen ions on platinum and tin dioxide based electrodes in this system and to determine the evolution potential of oxygen. Then, the gas electrode was used for constant current electrolysis. Compared with the non-passing gas and argon gas, the anode showed obvious depolarization (the anode potential decreased about 0.8 V). The experimental results show that hydrogen has been involved in the reaction of the anode three-phase interface (gas-electrolyte-electrode), which is feasible for the application of the reducing gas anode in aluminum electrolysis.