空氣電極在氫氧化鉀溶液中之防蝕研究

Corrosion Prevention of Air Electrode in KOH Electrolyte Solution

空氣電極是鋅空氣電池的最重要組件。空氣電極在高濃度KOH電解液中的劣化現象將嚴重傷害鋅空氣電池的功率與使用壽命。本利用無電鍍Ni-P、PVD濺鍍銀與添加PEG600有機抑制劑等方法以防止空氣電極在8 M KOH溶液中劣化。實驗結果顯示，以Ag／Ni-P作為銅集電網的鍍層，不但能夠保護空氣電極並且可以提升電極的陰極氧還原反應。此外，有機腐蝕抑制劑PEG600亦可添加於8 M KOH溶液中以改善銅集電網的耐蝕性並防止空氣電極劣化。對於具有Ag／Ni-P鍍層的高耐蝕性空氣電極，添加PEG600並不會影響電極的氧還原電流。

The air electrode is the most important component of the zinc-air battery. The degradation of air electrode in high concentration KOH aqueous electrolyte solution causes dramatic decreases in the specific power as well as the service life of the zinc-air battery. This study is to protect the air electrode against the degradation in 8 M KOH aqueous solution by different methods ,namely, electroless Ni-P coating, PVD sputtering Ag and addition of PEG600 organic inhibitor. The results indicated that, the Ag / Ni-P coating on the copper current collector could not only protect the air electrode but also improve its cathodic oxygen reduction activity. Additionally, the PEG600 organic inhibitor could also enhance the corrosion resistance of the copper current collector to prevent the degradation of the air electrode in 8 M KOH aqueous solution. For the high corrosion resistant air electrode with Ag / NiP coating , there is no change in the oxygen reduction current could be observed because of the addition of PEG600.