Constructing efficient, low-cost and durable catalyst for hydrogen peroxide (H₂O₂) reduction and oxidation is of significant importance for fuel cells with H₂O₂ as oxidant or fuel. Herein, a novel approach of two-step spontaneous reduction is developed to fabricate the 3D rGO-modified Ni foam supported Pd nanoparticles (PRNF) composite for H₂O₂ electroreduction and electrooxidation. The structure, morphology and composition of the PRNF composite are characterized using XRD, SEM, TEM, XPS and Raman analysis. Reduced graphene oxidation (rGO) film with ripple-liked wrinkles improves the surface area, electronic conductivity and corrosion resistance in acidic media of Ni substrate and the dispersing degree of Pd particles. The PRNF electrode exhibits excellent catalytic activity and stability towards H₂O₂ electroreduction in NaOH or H₂SO₄ solutions and electrooxidation in NaOH solutions. In addition, the Al–H₂O₂ semi-fuel cell and the H₂O₂–H₂O₂ fuel cell equipped with the PRNF electrode both deliver a higher power density (278 and 67.2 mW cm⁻², respectively) and a long term cycle stability (over 50 h). This study introduces a facile and low-cost electrode preparation method which may provide new opportunities to develop high-performance electrodes for energy storage/conversion devices.

对于以H ₂ O ₂作为氧化剂或燃料的燃料电池，构建有效，低成本且持久的用于过氧化氢（H ₂ O ₂）还原和氧化的催化剂至关重要。本文中，开发了一种两步自发还原的新方法，以制备用于H ₂ O ₂的3D rGO改性的Ni泡沫负载的Pd纳米颗粒（PRNF）复合材料电还原和电氧化。使用XRD，SEM，TEM，XPS和拉曼分析对PRNF复合材料的结构，形态和组成进行表征。减少的具有波纹状皱纹的石墨烯氧化（rGO）膜可提高Ni基体在酸性介质中的表面积，电子导电性和耐腐蚀性，并改善Pd颗粒的分散度。PRNF电极对NaOH或H ₂ SO ₄溶液中的H ₂ O ₂电还原以及在NaOH溶液中的电氧化显示出优异的催化活性和稳定性。此外，Al–H ₂ O ₂半燃料电池和H ₂ O ₂ –H ₂ O配备有PRNF电极的₂燃料电池均具有更高的功率密度（分别为278和67.2 mW cm ^-2）和长期循环稳定性（超过50小时）。这项研究介绍了一种简便且低成本的电极制备方法，这可能为开发用于储能/转换装置的高性能电极提供新的机会。