0D-2D Interaction: Pt quantum dots trigger the strain effect of S-NiFeP nanosheet to achieve ampere-level current density overall water splitting performance of Pt@S-NiFeP/NF electrode
Nowadays, the electrocatalytic regulation mechanism of quantum dots (QDs)-supported materials is limited to strong metal-support interaction (SMSI) and electron-metal-support interaction (EMSI). However, the lattice strain of the carrier induced by QDs is neglected, which is not conducive to the directional design of the QDs-supported electrode and the establishment of its structure-performance correlation. Given these, the size and distribution of Pt QDs controlled by electrodeposition effectively regulate the strain degree on S-NiFeP nanosheets. DFT results reveal that Pt@S-NiFeP/NF complies with a Fe-Pt dual active sites mechanism for alkaline HER, and a Fe active site mechanism for OER. Interestingly, the compressive strain in the S-NiFeP substrate effectively promotes the d‐band center shift and the energy barrier reduction, thereby optimizing the alkaline HER and OER kinetics. As expected, Pt@S-NiFeP/NF with appropriate strain owns alkaline HER and OER performance at 1 A cm −2 that exceeds the commercial Pt/C and RuO 2 . Overall, this work has guided the structural design of the 'noble metal QDs@carrier' model and laid a foundation for its application at ampere-level current densities.
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