气相脱合金法制备Pt-Co合金催化剂及性能研究
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摘要
为了降低质子交换膜燃料电池催化剂的Pt用量,使用气相脱合金法制备Pt-Co脱合金催化剂,并使用XRD、TEM、ICP和电化学工作站对所制备催化剂的结构和性能进行表征。结果显示,气相脱合金能够有效去除合金催化剂表面的非铂金属,Pt与Co的原子比能够从1∶3.37升高到1∶0.67,脱合金后的电化学活性增加,Pt-Co气相脱合金后较脱合金前的半波电位右移了0.05ev。
In order to reduce the Pt content of Pt catalyst in fuel cell,Pt-Co de-alloying catalyst was prepared by gas phase de-alloying method. The structure and properties of the prepared catalyst were characterized by XRD,TEM,ICP and electrochemical workstation. The results show that the gas phase alloy de-alloying can effectively remove the nonplatinum metal on the surface of the alloy catalyst. The atomic ratio of Pt to Co can be reduced from 1∶ 3. 37 to 1∶ 0. 67,the electrochemical activity of the alloy is increased,and the half-wave potential of the Pt-Co alloy catalyst treated by gas-phase de-alloying method right shifted by 0. 05 e V.
In order to reduce the Pt content of Pt catalyst in fuel cell,Pt-Co de-alloying catalyst was prepared by gas phase de-alloying method. The structure and properties of the prepared catalyst were characterized by XRD,TEM,ICP and electrochemical workstation. The results show that the gas phase alloy de-alloying can effectively remove the nonplatinum metal on the surface of the alloy catalyst. The atomic ratio of Pt to Co can be reduced from 1∶ 3. 37 to 1∶ 0. 67,the electrochemical activity of the alloy is increased,and the half-wave potential of the Pt-Co alloy catalyst treated by gas-phase de-alloying method right shifted by 0. 05 e V.
引文
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[2]Rudi S,Gan L,Cui C,Gliech M,Strasser P.Electrochemical Dealloying of Bimetallic ORR Nanoparticle Catalysts at Constant Electrode Potentials[J].J.Electrochem.Soc.,2015,(162):F403-F409.
[3]Baldizzone C,Gan L,Hodnik N,Keeley G P,Kostka A,Heggen M,Strasser P,Mayrhofer K J J.Stability of Dealloyed Porous Pt/Ni Nanoparticles[J].ACS Catal.,2015,(05):5000-5007.
[4]Gan L,Cui C,Heggen M,Dionigi F,Rudi S,Strasser P.Element-specific anisotropic growth of shaped platinum alloy nanocrystals[J].Science,2014,(346):1502-1506.
[5]Gasteiger H A,Markovic N M.Chemistry.Just a dream-or future reality[J].Science,2009,(324):48-49.
[6]Strasser P,Koh S,Anniyev T,Greeley J,More K,Yu C,Liu Z,Kaya S,Nordlund D,Ogasawara H,Toney M F,Nilsson A.Lattice-strain control of the activity in dealloyed core-shell fuel cell catalysts[J].Nat.Chem.,2010,(02):454-460.
[7]Yang J,Chen X,Yang X,Ying J Y.Stabilization and compressive strain effect of Au Cu core on Pt shell for oxygen reduction reaction[J].Energy Environ.Sci.,2012,(05):8976-8982.
[8]Han B,Carlton C E,Kongkanand A,Kukreja R S,Theobald B R,Gan L,O'malley R,Strasser P,Wagner F T,Shao-Horn Y.Record activity and stability of dealloyed bimetallic catalysts for proton exchange membrane fuel cells[J].Energy Environ.Sci.,2015,(08):258-266.