電鍍鎳磷合金及其電催化活性研究

Electrodeposition and Electrocatalytic Properties of Nickel-Phosphorus Alloys

本研究於檸檬酸浴中製備鎳磷合金，並探討其在酸性電解液中的電催化活性。結果顯示檸檬酸浴中製備之非晶鎳磷合金在酸性電解液中同時具有優異電催化活性與耐蝕性。此外，鍍層磷含量雖不受電流密度影響，但電催化活性隨電流密度提高而增加，且鍍層電催化活性與吸附氫能力具有正相關性。隨著溶液溫度增加會降低鍍層電催化活性能力，顯示升高溶液溫度不利於電催化反應發生，推測電極材料表面在高溫溶液中易生成氧化膜。

Ni-P alloy coatings were electroplated from nickel citric baths, and their hydrogen evolution reaction in acid electrolytes was studied. Experimental results show that all Ni-P deposits studied were amorphous, and exhibited excellent electrocatalytic activity and corrosion resistance in acid electrolytes. The deposit phosphorus content hardly changed with the electroplating current density, whereas the electrocatalytic activity of the deposit increased with increasing electroplating current density. Moreover, the deposit that absorbed more hydrogen during cathodic polarization exhibited better electrocatalytic activity. Finally, the electrocatalytic activity of the deposit became poor when measured in the electrolytes at higher temperatures. This is likely to be due to the formation of a surface oxide film in the high-temperature electrolyte.