Engineering bimetallic single-atom catalysts utilizing the reducibility of HxMoO3 for high efficiency hydrogen evolution
Bimetallic single-atom catalysts have garnered substantial interest due to their extraordinary catalytic prowess, which arises from atomic-level synergistic effects that can significantly enhance hydrogen evolution reaction (HER) kinetics beyond the capabilities of monometallic single-atom catalysts. However, the fabrication of bimetallic single-atom catalysts remains a tremendous challenge. Herein, we introduce an in-situ reduction method to fabricate bimetallic single-atom catalysts anchored on hydrogenated molybdenum trioxide (H x MoO 3 , 0 < x ≤ 2). Intriguingly, H x MoO 3 exhibits inherent reducing capabilities that facilitate the in-situ reduction of some metal ions to metallic single atoms in steps on its surface, thereby enabling the constructing of bimetallic single-atom structures. As a testament to this strategy, the prepared PtM/H x MoO 3 catalysts (M = Ag, Au, Pd, Rh) with ultra-low noble metal loadings (wt% < 1%) on the nano-H x MoO 3 support exhibit remarkable efficiency in HER. Outperforming both monometallic single-atom catalysts (M/H x MoO 3 ) and commercial Pt/C, these catalysts demonstrate enhanced HER performance, and the PtPd/H x MoO 3 exhibits outstanding performance with an overpotentials of 10 mV at 10 mA/cm 2 , Tafel slope of 36 mV/dec, and long-term durability in acidic media. The presence of Pt single-atom significantly enhances the electrochemical surface area (ECSA) and accelerates the kinetics of the HER for other metal single atoms.
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