不同搅拌方式对Ni-Fe-Co镀层组织结构和电催化析氢性能的影响

Effects of Different Stirring Methods on Microstructure and Electro-catalytic Hydrogen Evolution Performance of Ni-Fe-Co Coatings

目的得到具有更高电催化析氢活性的Ni-Fe-Co镀层电极。方法采用不同的搅拌方式电沉积制备了Ni-Fe-Co镀层,通过SEM、EDS和XRD等分析手段研究了其微观形貌、成分及物相组成,并利用电化学测试分析技术探究了不同搅拌方式对其电催化析氢活性的影响。结果三种镀层电极均为简单固溶体BCC结构,其中磁力搅拌条件下制得的镀层电极的表面组织更致密均匀,具有更大的真实表面积,分别为不搅拌和超声搅拌下的6倍和2倍。在电位为-1.6 V时,磁力搅拌条件下制得的镀层电极析氢电流密度达到173m A/cm^2,明显高于另外两种镀层电极,其交流电流密度为45.9μA/cm^2,分别是不搅拌和超声搅拌条件下的2倍和3倍。结论磁力搅拌有效地增大了镀层的比表面积,进而提高了镀层的电催化析氢活性。

The work aims to obtain a Ni-Fe-Co electrode exhibiting higher electro-catalytic activity of hydrogen evolution. Based upon electro-deposition, Ni-Fe-Co coatings were prepared in different stirring methods. Microstructure, composition and phase of the coatings was investigated with scanning electron microscope（SEM）, energy dispersive spectrometer（EDS） and X-ray diffractometer（XRD）, respectively. The effects of different stirring methods on electro-catalytic activity of hydrogen evolution were studied by adopting electrochemical test analysis technology. All the three kinds of coating electrodes were simple solid solution BCC structures. However, the coating electrode prepared under magnetic stirring condition had a more compact and uniform surface structure, and also larger real surface area, which was 6 times and 2 times as much as that of the electrodes prepared under no-stirring condition and ultrasonic stirring condition, respectively. At the potential of -1.6 V, current density of the coating electrode prepared under magnetic stirring condition was 173 m A/cm^-2, which was significantly higher than that of the other two coating electrodes. In addition, its AC current density（45.9 μA/cm^-2） was 2 times and 3 times as much as that of the coating electrodes prepared under the no-stirring condition and ultrasonic stirring condition, respectively. Magnetic stirring can effectively increase specific surface area of the coatings and further improve the coatings＇ electro-catalytic activity of hydrogen evolution.