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Theoretical and experimental design of Pt-Co(OH)2 electrocatalyst for efficient HER performance in alkaline solution.
- Source :
-
Progress in Natural Science . Jun2019, Vol. 29 Issue 3, p356-361. 6p. - Publication Year :
- 2019
-
Abstract
- Design efficient electrocatalysts become significant for the hydrogen evolution reaction (HER) in alkaline solution. Here, the HER performance on Pt-Co(OH) 2 has been investigated by using DFT calculations. Compared with pure Pt, the Pt-Co(OH) 2 shows excellent hydrogen binding energy (−0.29 eV) and hydrogen adsorption free energy (0.02 eV). More strikingly, the water dissociation process on Pt-Co(OH) 2 is an exothermic reaction while that of Pt is an endothermic reaction, demonstrating that the Pt-Co(OH) 2 is an excellent catalyst for HER in alkaline medium. Then the two-step electrodepositions was used to fabricate Pt-Co(OH) 2 on the carbon paper (CP). The Pt-Co(OH) 2 /CP shows the lowest overpotential of only 37.6 mV at a current density of 10 mA cm−2 in 0.1M KOH, the smallest Tafel slope of 58 mV dec−1 and the good stability for 20000s without obvious degradation. Image 1 • The first time to study the HER performance on Pt-Co(OH) 2 by DFT calculations techniques. • The computational results show that the Pt-Co(OH) 2 is an excellent catalyst for HER in alkaline medium. • By two-step electrodepositions to prepare Pt-Co(OH) 2 , the experiment confirm the results of computational. • The Pt-Co(OH) 2 /CP shows the lowest overpotential and the smallest Tafel slope compared with those of the other samples. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10020071
- Volume :
- 29
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Progress in Natural Science
- Publication Type :
- Academic Journal
- Accession number :
- 138202705
- Full Text :
- https://doi.org/10.1016/j.pnsc.2019.05.009