硼、磷共掺杂铁钴双金属材料的制备及其电催化析氧性能

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

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。

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 Fourier 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 impedance 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,suggesting 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.