Hydrogen peroxide (H₂O₂) has the wide range of applications in industry and living life. However, the development of the efficient heterogeneous catalyst in the direct H₂O₂ synthesis (DHS) from H₂ and O₂ remains a formidable challenge because of the low H₂O₂ producibility. Herein, we develop a two-step approach to prepare PdSn nanowire catalysts, which comprises Pd oxide layered on PdSn nanowires (Pd_L/PdSn-NW). The Pd_L/PdSn-NW displays superior reactivity in the DHS at zero Celcius, presenting the H₂O₂ producibility of 528 mol kg_cat⁻¹·h⁻¹ and H₂O₂ selectivity of >95%. A layer of Pd oxide on the PdSn nanowire generates bi-coordinated Pd, leading to the different adsorption behaviors of O₂, H₂ and H₂O₂ on the Pd_L/PdSn-NW. Furthermore, the weak adsorption of H₂O₂ on the Pd_L/PdSn-NW contributes to the low activation energy and high H₂O₂ producibility. This surface engineering approach, depositing metal layer on metal nanowires, provides a new insight in the rational designing of efficient catalyst for DHS.

过氧化氢（H ₂ O ₂）在工业和生活中有着广泛的应用。然而，由于H 2 O 2 的低产率，在由H 2 和O 2 直接合成H 2 O 2 （DHS）中_开发高效_的多相催化剂_仍然是一个_巨大的挑战。在此，我们开发了一种两步法来制备 PdSn 纳米线催化剂，该催化剂包括在 PdSn 纳米线上的 Pd 氧化物（Pd _L /PdSn-NW）。Pd _L /PdSn-NW 在 DHS 中在零摄氏度下表现出优异的反应性，呈现出528 mol kg的 H ₂ O _2产率cat ^-1 ·h ^-1和H ₂ O ₂选择性>95%。PdSn纳米线上的一层Pd氧化物产生双配位Pd，导致O ₂、H ₂和H ₂ O ₂在Pd _L /PdSn-NW上的不同吸附行为。此外，H ₂ O ₂在 Pd _L /PdSn-NW 上的弱吸附有助于低活化能和高 H ₂ O ₂产率。这种表面工程方法，在金属纳米线上沉积金属层，为合理设计用于 DHS 的高效催化剂提供了新的见解。