Monoatomic Platinum-Embedded Hexagonal Close-Packed Nickel Anisotropic Superstructures as Highly Efficient Hydrogen Evolution Catalyst.
basic_science · Level V
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- Record sourced from PubMed, PMID 34751578.
- Also identified by DOI 10.1021/acs.nanolett.1c02313.
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Abstract
The rational design of platinum (Pt) based nanostructures with specific crystal structure plays a significant role in their diverse applications. Herein, the anisotropic superstructures (ASs) of monoatomic Pt-embedded hexagonal close-packed nickel (hcp Ni) nanosheets were successfully synthesized for efficient hydrogen evolution in which an unusual dissociation-diffusion-desorption mechanism played a crucial role. The overpotential for the Pt/Ni ASs to reach the specific current density (10 mA cm<sup>-2</sup>) is 28.0 mV, which is much lower than that of conventional Pt/C catalyst (71.0 mV). Moreover, at the overpotential of 100 mV, the mass activity of 30.2 A mg<sub>Pt</sub><sup>-1</sup> for the Pt/Ni ASs is 1060% greater than that in conventional Pt/C catalyst (2.6 A mg<sub>Pt</sub><sup>-1</sup>). This work provides a new approach to synthesize highly anisotropic superstructures embedded with monoatomic noble metals to boost their hopeful applications in catalytic applications.