Single-nanoparticle (NP) collisions have enabled the measurement of electrocatalytic reactions on single NPs by the nanoconfinement-amplified present. Just lately, it has been demonstrated that the electrocatalytic exercise of single NPs is improved by stochastic collision electrochemistry, as a result of the nice dispersion alleviates the aggregation, deactivation, and detachment of nano-electrocatalysts adhered on the electrode floor. Nevertheless, there may be nonetheless a urgent have to additional enhance the electrocatalytic efficiency of single NPs.
On the most elementary degree, the electrochemical response can solely be triggered when single NPs attain the tunneling distance. Subsequently, rising the collision interval of single NPs within the tunneling area ought to contribute to the development within the electrocatalytic effectivity.
Just lately, a analysis crew led by Prof. Yi-Tao Lengthy from Nanjing College, China report using a confined microchannel to manage the dynamic movement of single Pd NPs, with the intention of constructing a platform to extend the collision interval of single Pd NPs within the tunneling area. Single Pd NP collisions function a mannequin system that may very well be used to simply examine high-performance catalysts for the hydrogen evolution response (HER).
They present that the built-in cost related to the HER within the confined channel reaches twice as excessive as that primarily based on standard single-NP collisions because of the enhanced hydrodynamic trapping impact. The outcomes had been revealed in Chinese language Journal of Catalysis.
The microchannel is first forged in PDMS, then connected to a glass slide supporting an Au UME, following carried out stochastic collision electrochemical measurements. It’s value noting that the collision length of Pd NPs utilizing the confined microchannel is longer than that by utilizing the standard UME. Close to-wall hindered diffusion could be vital when NPs are dispersed in a confined microchannel, indicating that the diffusion of single NPs is hindered by further hydrodynamic adsorption.
Consequently, near-wall hindered diffusion impact that might confine dynamic single Pd NPs within the tunneling area at the place the HER probably happens. Additional, the response time throughout a collision is prolonged.
The only Pd NP collisions with the microchannel-based Au UME had been carried out at completely different utilized overpotentials to additional demonstrated the impact of an prolonged collision length on the HER kinetics. Based on the knowledge on the electrochemical traits of Pd NPs for HER within the ensemble system, it’s proved that the time-resolved present alerts is generated by cost displacement on the double layer of the Au UME because of the dynamic movement of single Pd NPs, hydrogen under-potential desorption, and HER on single Pd NPs, respectively.
Si-Min Lu et al, Enhanced single-nanoparticle collisions for the hydrogen evolution response in a confined microchannel, Chinese language Journal of Catalysis (2022). DOI: 10.1016/S1872-2067(21)64034-2
Chinese language Academy of Sciences
Enhanced single-nanoparticle collisions for the hydrogen evolution response in a confined microchannel (2022, November 8)
retrieved 15 November 2022
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