Construction of porous three-dimensional (3D) heterostructured materials is promising for establishing high-performance energy-storage devices, enabling large surface area, facilitated ion and electron transport, and synergistic effects between multi-components. Here, we report a simple and cost-efficient freeze-casting method to improve the electrochemical performance of porous 3D graphene aerogel (GA) embedded with gold nanoparticles (3D Au/GA). The as-synthesized 3D Au/GA was broadly characterized by XRD, Raman, XPS, SEM, and TEM. Morphology observations show that 3D-porous cellular structure of GA with uniform distribution of 20 nm Au nanoparticles on the surface of GA. Based on structural merits, the electrochemical performance of as-synthesized porous 3D Au/GA was exemplified as electrode materials for supercapacitor with a high specific capacitance of 554 F g⁻¹ at 5 mVs⁻¹, excellent cycling stability with capacitance retention of 91.06% after 10,000 cycles, and exhibits significantly specific energy of 10.7 W h kg⁻¹ at a specific power of 203.5 W kg⁻¹. This could be ascribed to the synergetic effect of conducting Au and the unique 3D porous, cellular structure of GA. In addition, the developed electrode materials are used to fabricate a symmetric solid-state supercapacitor (SSC) device for demonstrating the practical applicability, and it was able to light a commercial LED. Our method opened a new direction to synthesize porous 3D GA with various nanoparticle decorations for numerous applications as energy storage devices, catalysis, sensors, biomedical, and environmental applications.

多孔三维 (3D) 异质结构材料的构建有望用于构建高性能储能装置，实现大表面积、促进离子和电子传输以及多组分之间的协同效应。在这里，我们报告了一种简单且经济高效的冷冻铸造方法，以提高嵌入金纳米粒子（3D Au/GA）的多孔 3D 石墨烯气凝胶（GA）的电化学性能。合成后的 3D Au/GA 通过 XRD、拉曼、XPS、SEM 和 TEM 进行广泛表征。形态学观察表明，GA 的 3D 多孔细胞结构在 GA 表面均匀分布着 20 nm Au 纳米颗粒。基于结构优点，^-1在 5 mVs ^-1，优异的循环稳定性，10,000 次循环后电容保持率为 91.06%，在 203.5 W kg ^-1的比功率下表现出显着的 10.7 W h kg ^-1比能量。这可以归因于导电 Au 和 GA 独特的 3D 多孔蜂窝结构的协同效应。此外，开发的电极材料用于制造对称固态超级电容器（SSC）装置，以证明其实用性，并能够点亮商用 LED。我们的方法为合成具有各种纳米粒子装饰的多孔 3D GA 开辟了一个新方向，用于储能设备、催化、传感器、生物医学和环境应用等众多应用。