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Study on Electron Structure for Ni Base Amorphous Alloy Electrodes
Mo Shaobo1, Yang Yezhi1, Wang Longbiao2, Wu Jun2, Huang Qingan2
1.Center of Testing,Wuhan University,Wuhan 430072;2.Chemistry Department,Wuhan University,Wuhan 430072
Abstract:
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 ηH2 will 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.②The Fermi energy level is also shown to be correlated with the hydrogen evolution overpotential.It is similar to①that 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 CeH2 or LaH2 model in Ni-Ce-P or Ni-La-P amorphous alloys from the photoelectron spectra of Ce3d or La3d.Consequently,we have a suggestion that a storaging hydrogen effect possibly take place with Ceriam or Lanthanium in Ni-Ce-Por Ni-La-P amorphous alloys.
Key words:  Nickel base alloys,XPS,Fermi energy level,Hydrogen evolution reaction,Overpotential of hydrogen evolution
FundProject:国家自然科学基金资助项目
非晶态Ni基合金电极电子结构的XPS研究
莫少波1, 杨业智1, 王龙彪2, 吴俊2, 黄清安2
1.武汉大学测试中心武汉 430072;2.武汉大学化学系武汉 430072
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。
关键词:  Ni基合金  XPS  结合能  费米能级  析氢反应  析氢超电势
DOI:10.1088/1674-0068/13/4/487-491
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