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|Title:||Electrochemical Dealloying of PdCu3 Nanoparticles to Achieve Pt-like Activity for the Hydrogen Evolution Reaction|
Pati, Swapan Kumar
Peter, Sebastian C.
hydrogen evolution reaction
Oxygen Reduction Reaction
Enhanced Electrocatalytic Activity
|Publisher:||Wiley-V C H Verlag Gmbh|
|Citation:||Jana, R.; Subbarao, U.; Peter, S. C., Ultrafast synthesis of flower-like ordered Pd3Pb nanocrystals with superior electrocatalytic activities towards oxidation of formic acid and ethanol. Journal of Power Sources 2016, 301, 160-169 http://dx.doi.org/10.1016/j.jpowsour.2015.09.114|
|Abstract:||Manipulating the d-band center of the metal surface and hence optimizing the free energy of hydrogen adsorption (G(H)) close to the optimal adsorption energy (G(H)=0) for hydrogen evolution reaction (HER), is an efficient strategy to enhance the activity for HER. Herein, we report a oleylamine-mediated (acting as the solvent, stabilizer, and reducing agent) strategy to synthesize intermetallic PdCu3 nanoparticles (NPs) without using any external reducing agent. Upon electrochemical cycling, PdCu3 transforms into Pd-rich PdCu (G(H)=0.05eV), exhibiting remarkably enhanced activity (with a current density of 25mAcm(-2) at approximate to 69mV overpotential) as an alternative to Pt for HER. The first-principle calculation suggests that formation of low coordination number Pd active sites alters the d-band center and hence optimal adsorption of hydrogen, leading to enhanced activity. This finding may provide guidelines towards the design and development of Pt-free highly active and robust electrocatalysts.|
|Description:||Open Access (Accepted Manuscript)|
|Appears in Collections:||Research Articles (Swapan Kumar Pati)|
Research Papers (Sebastian C. Peter)
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