硼、磷共掺杂铁钴双金属材料的制备及其电催化析氧性能

采用一步水热法合成了硼、磷共掺杂铁钴材料(Fe-Co-B-P)。借助扫描电子显微镜(SEM)、X射线衍射(XRD)、X射线光电子能谱(XPS)、傅里叶变换红外光谱(FT-IR)等技术对所合成材料的形貌、结构和组成进行表征。利用线性扫描伏安(LSV)、循环伏安(CV)、电化学阻抗谱(EIS)等技术研究材料电化学析氧反应(OER)性能。结果表明，Fe-Co-B-P表面疏松且粗糙，颗粒间有许多空隙。在电流密度为10和100 mA·cm^-2时，其过电势分别为278和309 mV，Tafel斜率为24 mV·dec^-1，说明该材料具有较优的电催化析氧性能。其在连续进行10 h的计时电位测试过程中，电势基本保持在1.55 V (vs RHE)，表明该催化剂具有较好的电化学稳定性。这是由于铁钴双金属与硼、磷非金属之间的协同作用促进了电子的传递。

Synthesis of boron and phosphorus co-doped Fe-Co bimetallic materials for electrocatalytic oxygen evolution

Boron and phosphorus co-doped Fe-Co (Fe-Co-B-P) materials were successfully synthesized by one-step hydrothermal method. The morphology, structure, and composition of the synthesized materials were characterized by scanning electron microscope (SEM), X-ray diffraction (XRD), X-ray photoelectron spectrometer (XPS), and Fou-rier transform infrared spectroscopy (FT-IR). The electrochemical oxygen evolution reaction (OER) properties of the materials were studied by linear sweep voltammetry (LSV), cyclic voltammetry (CV), and electrochemical imped-ance spectroscopy (EIS) techniques. The results showed that the loose rough surface of as-synthesized Fe-Co-B-P had many voids among particles, which can expose abundant active sites and improve the OER electrocatalytic activity. The overpotential of Fe-Co-B-P was 278 and 309 mV under the current density of 10 and 100 mA·cm^-2, respectively. And the Fe-Co-B-P electrocatalyst possessed favorable reaction kinetics with a low Tafel slope of 24 mV·dec^-1 and facilitated charge transfer, indicating that Fe-Co-B-P had better OER electrocatalytic performance. Moreover, the potential was basically maintained at 1.55 V (vs RHE) after 10 h chronopotentiometric test, suggest-ing that the catalyst had good electrochemical stability. This is due to the synergistic effect between Fe-Co bimetal and B-P-nonmetal to promote electron transfer.