Rapid synthesis of high-entropy alloy nanoparticles (HEA NPs) offers new opportunities to develop functional materials in widespread applications. Although some methods have successfully produced HEA NPs, these methods generally require rigorous conditions such as high pressure, high temperature, restricted atmosphere, and limited substrates, which impede practical viability. In this work, we report laser solid-phase synthesis of CrMnFeCoNi nanoparticles by laser irradiation of mixed metal precursors on a laser-induced graphene (LIG) support with a 3D porous structure. The CrMnFeCoNi nanoparticles are embraced by several graphene layers, forming graphene shell-encapsulated HEA nanoparticles. The mechanisms of the laser solid-phase synthesis of HEA NPs on LIG supports are investigated through theoretical simulation and experimental observations, in consideration of mixed metal precursor adsorption, thermal decomposition, reduction through electrons from laser-induced thermionic emission, and liquid beads splitting. The production rate reaches up to 30 g/h under the current laser setup. The laser-synthesized graphene shell-encapsulated CrMnFeCoNi NPs loaded on LIG-coated carbon paper are used directly as 3D binder-free integrated electrodes and exhibited excellent electrocatalytic activity towards oxygen evolution reaction with an overpotential of 293 mV at the current density of 10 mA/cm² and exceptional stability over 428 h in alkaline media, outperforming the commercial RuO₂ catalyst and the relevant catalysts reported by other methods. This work also demonstrates the versatility of this technique through the successful synthesis of CrMnFeCoNi oxide, sulfide, and phosphide nanoparticles.

高熵合金纳米颗粒（HEA NP）的快速合成为开发广泛应用的功能材料提供了新的机会。尽管一些方法已成功生产HEA NP，但这些方法通常需要严格的条件，如高压、高温、受限气氛和有限的基质，这阻碍了实际可行性。在这项工作中，我们报告了通过在具有 3D 多孔结构的激光诱导石墨烯 (LIG) 载体上激光照射混合金属前体来激光固相合成 CrMnFeCoNi 纳米颗粒。 CrMnFeCoNi 纳米颗粒被多个石墨烯层包围，形成石墨烯壳封装的 HEA 纳米颗粒。通过理论模拟和实验观察，研究了在 LIG 载体上激光固相合成 HEA NP 的机理，考虑到混合金属前驱体吸附、热分解、激光诱导热电子发射的电子还原和液体珠分裂。在当前的激光设置下，生产率可达 30 g/h。激光合成的石墨烯壳封装的CrMnFeCoNi NPs负载在LIG涂层碳纸上，直接用作3D无粘合剂集成电极，对析氧反应表现出优异的电催化活性，在10 mA/的电流密度下过电势为293 mV。 cm ²和在碱性介质中超过428小时的优异稳定性，优于商业RuO ₂催化剂和其他方法报道的相关催化剂。这项工作还通过成功合成 CrMnFeCoNi 氧化物、硫化物和磷化物纳米颗粒证明了该技术的多功能性。