Hydrogen is one of the most promising alternative energy resources due to its environmental benignity and high energy density. However, the development of high performance catalysts for efficient and stable liquid-phase hydrogen generation remains a major challenge for the widespread use of hydrogen energy. Here, Ag supported on ferromagnetic MgFe₂O₄ nanoparticles (Ag/MgFe₂O₄) was employed as an efficient, stable, and magnetoswitchable catalyst for the conversion of formaldehyde solution into H₂ using O₂ as a cocatalyst at room temperature. It was found that the adsorption and activation of O₂ on the Ag surface can be enhanced by the abundant surface oxygen vacancies on MgFe₂O₄ support and the electron transfer between MgFe₂O₄ and Ag, leading to the generation of the main active species ˙OOH radicals and the subsequent cleavage of C–H bonds in HCHO to realize hydrogen evolution. Meanwhile, magnetic control experiments are designed to switch the catalytic reactions between “on” and “off” states, resulting in the effective recovery and reuse of the catalysts. The present research introduces a new means to create a magnetoswitchable catalytic system for scalable hydrogen energy applications.

中文翻译：

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Ag 和铁磁性 MgFe2O4 的相互作用通过甲醛重整优化氧促进析氢

由于其环境友好性和高能量密度，氢是最有前途的替代能源之一。然而，开发用于高效稳定液相制氢的高性能催化剂仍然是氢能广泛使用的主要挑战。在这里，负载在铁磁性 MgFe ₂ O ₄纳米颗粒（Ag/MgFe ₂ O ₄）上的Ag被用作一种高效、稳定且可磁开关的催化剂，用于在室温下使用 O ₂作为助催化剂将甲醛溶液转化为 H ₂。发现 O ₂的吸附和活化MgFe ₂ O ₄载体上丰富的表面氧空位和MgFe ₂ O ₄与Ag之间的电子转移可以增强Ag表面上的氧原子，导致主要活性物种˙OOH自由基的产生和随后的C-裂解HCHO 中的 H 键以实现析氢。同时，设计磁控实验以在“开”和“关”状态之间切换催化反应，从而实现催化剂的有效回收和再利用。本研究介绍了一种新方法，可以为可扩展的氢能应用创建磁开关催化系统。