metal oxide electronic interactions in composite electrocatalysts have a considerable impact on their catalytic capability. In this study, we successfully synthesized an electrocatalytic material composed of MoO₃/C species-supported Pd nanoparticles (Pd-MoO₃/C) using a convenient hydrothermal method, which exhibited excellent catalytic activities for both ethanol oxidation and oxygen reduction in KOH media. The specific activity of Pd-MoO₃/C toward ethanol oxidation with MoO₃ loading (40 wt%) was ~ 2.6 times greater than that for the commercial Pd/C (10 wt%) with the same Pd content. In particular, the activity could effectively hold up to ~ 60% of its maximum activity after 500-cycle tests, demonstrating improved cyclical stability. Notably, the fast electron transfer kinetics toward oxygen reduction for Pd-MoO₃/C (40%) were also comparable to those of commercial Pt/C (20 wt%) catalysts. These superior electrochemical features are primarily derived from the stronger electronic coupling between Pd and MoO₃ through charge transfer, which can supply more active centers and improve the anti-poisoning ability. Meanwhile, the MoO₃ species in the Pd-MoO₃/C composite may provide additional benefits in terms of electrical conductivity and dispersion.

Graphical Abstract

中文翻译：

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MoO3/C负载的Pd纳米粒子作为乙醇氧化和氧还原反应的高效双功能电催化剂

复合电催化剂中的金属氧化物电子相互作用对其催化能力有相当大的影响。在这项研究中，我们使用方便的水热法成功合成了一种由MoO ₃ /C 物种负载的 Pd 纳米粒子 (Pd-MoO ₃ /C)组成的电催化材料，该材料在 KOH 介质中对乙醇氧化和氧还原均表现出优异的催化活性. _{Pd-MoO 3} /C对MoO ₃乙醇氧化的比活性载量（40 wt%）比具有相同 Pd 含量的商业 Pd/C（10 wt%）高约 2.6 倍。特别是，在 500 次循环测试后，该活性可以有效地保持其最大活性的 60%，表明循环稳定性得到改善。_{值得注意的是，Pd-MoO 3} /C (40%)的氧还原快速电子转移动力学也与商业 Pt/C (20 wt%) 催化剂相当。这些优异的电化学特性主要来源于Pd和MoO ₃通过电荷转移产生更强的电子耦合，可以提供更多的活性中心，提高抗中毒能力。同时， Pd-MoO ₃中的MoO _3物种/C 复合材料可以在导电性和分散性方面提供额外的好处。

图形概要