非晶态Ni基合金电极电子结构的XPS研究  

Study on Electron Structure for Ni Base Amorphous Alloy Electrodes

作　　者：莫少波[1] 杨业智[1] 王龙彪[2] 吴俊 黄清安[3] 

机构地区：[1]武汉大学测试中心,武汉430072 [2]武汉大学化学,武汉430072 [3]武汉大学化学系,武汉430072

出　　处：《Chinese Journal of Chemical Physics》2000年第4期487-491,共5页化学物理学报（英文）

基　　金：国家自然科学基金资助项目。

摘　　要：用ＸＰＳ测定了含Ｐ、Ｃｅ、Ｌａ的Ｎｉ基合金的费米能级及各元素的芯级电子结合能，讨论了合金的电子结构以及它与析氢反应的电催化活性即析氢超电势之间的联系。结果表明：合金中各元素的原子间存在着电荷传输，它对析氢反应活性起重要作用。A study of the electron structure of nickel base amorphous alloys have been made to explains the difference of the catalytic activity for the hydrogen evolution reaction (HER) between Ni -P amorphous alloys and Ni-Ce-P or Ni -La -P amorphous alloys. These alloy layers all were prepared on copper foil by an electrodeposition with the same condition, based on a series of experiments on the hydrogen evolution overpotential and X-ray photoelectron spectra(XPS), the hydrogen evolution overpotential ηH2, the orbital binding energy and Fermi energy level energy of individual element in amorphous alloys Ni-P, Ni-Ce-P and Ni-La-P were all recorded. From these measured results, some interesting conclusions have been shown as follows: ① The change tendency of the hydrogen evolution overpotential is consistent with that of the binding energy of Ni2p3/2 and P2p in above mentioned three alloys. As the binding energies deflct to low, the values of the hydrogen evolution overpotential ηH2Wil decreased. Charge transfer from low electronegativity element to high electronegativity element occurs among atoms, the excess electrons are located near those high electronegativity element atoms. In the case, these excess electrons promote proton discharge and provide preferable sites for hydrogen evolution reaction. As the result, the value of the hydrogen evolution overpotential will decrease, and exhibited similarly charge tendency with the binding energy. ② The Fermi energy level is also shown to be correlated with the hydrogen evolution overpotential. It is similar to ① that the value hydrogen evolution overpotential decrease When the Fermi energy level energies increase. Since Fermi energy level is presentation of the electronic chemical potential, as the energy Fermi energy level is higher, the work function is less, then the electron on the alloy surface can more freely tranfer to proton, result in the value of the hydrogen evolution overpotential decrease. ③ In addition, it can be seen that some hydrogen was storaged as

关 键 词：XPS 析氢反应 非晶态Ni基合金电极 电子结构 

分 类 号：O646.54[理学—物理化学]