Optical-magnetic field coupling technology provides an effective avenue for comprehensive enhancement of the overall performance of electrocatalytic reactions. However, this technology requires that the electrocatalysts possess good responsiveness to these fields. Moreover, the underlying mechanism for performance enhancement under an optical-magnetic field is also unknown. Herein, a low-temperature magnetic field-assisted electrodeposition method is reported to synthesize highly crystalline iron hydroxides on a nickel foam (Fe(OH)_x/NF), which enables directed hole and electron transfer under optical-magnetic field-assisted electrocatalysis. The external field-assisted synthesis and directed transfer effects greatly improve the oxygen evolution reaction (OER) performance of the catalyst, reflected in a reduction of 63 mV in overpotential at 10 mA cm^–2 (from 285 to 222 mV) and reliable stability. A new mechanism of “directed charge carrier (electron and hole) transfer” is proposed to elucidate the structural feature and functional enhancement of Fe(OH)_x/NF for achieving the optical-magnetic synergistic effects in the OER process.

中文翻译：

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低温磁场辅助合成高结晶性 Fe（OH）x 及其光磁场下定向载流子转移效应


光磁场耦合技术为全面提高电催化反应的整体性能提供了一条有效的途径。然而，这项技术要求电催化剂对这些场具有良好的响应性。此外，在光磁场下提高性能的潜在机制也是未知的。本文报道了一种低温磁场辅助电沉积方法可在泡沫镍 （Fe（OH）_x/NF） 上合成高结晶氢氧化铁，从而在光磁场辅助电催化下实现定向空穴和电子转移。外部场辅助合成和定向转移效应大大提高了催化剂的析氧反应 （OER） 性能，这体现在在 10 mA cm^–2 时的过电位降低了 63 mV（从 285 到 222 mV）和可靠的稳定性。提出了一种新的“定向电荷载流子（电子和空穴）转移”机制，阐明了 Fe（OH）_x/NF 的结构特征和功能增强，以实现 OER 过程中的光磁协同效应。