Co4S3纳米片的制备以及Fe3+掺杂对其电催化析氧性能的影响

采用溶剂热和超声剥离相结合的方法制备了超薄Co₄S₃纳米片，通过透射电子显微镜（TEM）、扫描电子显微镜（SEM）、原子力显微镜（AFM）、X-射线衍射分析（XRD）、拉曼光谱（Raman）等手段对其进行了结构和形貌的表征，并研究了其电催化产氧性能。结果表明，Co₄S₃纳米片在电流密度为10 mA/cm²下的过电势为377 mV，塔菲尔（Tafel）斜率为64.47 mV/dec；溶剂热过程中反应温度和溶剂比对产物的析氧反应（OER）催化活性影响不大，但是Fe³⁺的掺杂可以显著降低Co₄S₃纳米片的析氧过电势和Tafel斜率，提高材料的电催化稳定性。最后通过X-射线光电子能谱（XPS）分析了Fe³⁺的掺杂对Co₄S₃纳米片OER性能影响的机理。

Synthesis of Co4S3 nanosheets and the effects of the Fe3+ ions doping on their electrocatalytic properties in the oxygen evolution reaction

Ultrathin Co₄S₃ nanosheets have been prepared by a solvothermal approach combined with ultrasonic exfoliation, and the structure and morphologies of the products were characterized by TEM, SEM, AFM, XRD, and Raman spectroscopy. The performance of the material as an electrocatalyst in the oxygen evolution reaction (OER) was investigated. The results indicated that the Co₄S₃ nanosheets have excellent electrocatalytic properties with an overpotential of 377 mV at the current density of 10 mA/cm² and a small Tafel slope of 64.47 mV/dec. It was found that some synthesis parameters, such as the reaction temperature and the solvent ratio (diethylenetriamine:water), have little effect on the OER catalytic activity of the product, but Fe³⁺ doping can significantly reduce the oxygen evolution overpotential and Tafel slope, and also enhance OER stability. The reasons for these changes in OER activity were analyzed by XPS.