一步法合成Fe_(2)P/Fe_(3)C@C双功能电催化剂用于高效析氢反应和析氧反应

One step synthesis of Fe_(2)P/Fe_(3)C@C bifunctional electrocatalyst for high efficiency hydrogen evolution reaction and oxygen evolution reaction

开发高性能、低成本的双功能电催化剂用于大规模水电解仍是一个重大挑战.以六水合氯化铁(FeCl_(3)·6H_(2)O)、次磷酸钠(NaH_(2)PO_(2))、双氰胺(DCD)为原料通过一步固相烧结法合成出Fe_(2)P/Fe_(3)C@C.首先探讨了不同温度对样品结构和性能的影响,获得最佳的Fe_(2)P/Fe_(3)C@C(命名为Fe_(2)P/Fe_(3)C@C-800).然后通过X射线衍射仪(XRD)、显微共焦拉曼光谱仪(Raman)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)与X射线光电子能谱仪(XPS)对Fe_(2)P/Fe_(3)C@C-800的组成、形貌以及微观结构等进行表征分析.另外,通过电催化测试表明,Fe_(2)P/Fe_(3)C@C-800催化剂在10 mA/cm2时碱性电解液中析氢反应和析氧反应的过电势分别为179 mV和245 mV,且分别能保持100 h和50 h的稳定性.

Developing high-performance and cost-effective bifunctional electrocatalysts for large-scale water electrolysis remains a huge challenge.We report the Fe_(2)P/Fe_(3)C@C were obtained directly through one-step solid phase sintering process by using FeCl_(3)·6H_(2)O,NaH_(2)PO_(2) and DCD as raw materials.First,the effects of different temperatures on the morphology and catalytic properties of the catalysts were discussed to obtain the optimal Fe_(2)P/Fe_(3)C@C(denoted as Fe_(2)P/Fe_(3)C@C-800).After that,the composition,morphology and microstructure of the Fe_(2)P/Fe_(3)C@C-800 was characterized and analyzed by X-ray diffractometer(XRD),microscopic confocal Raman spectrometer(Raman),scanning electron microscope(SEM)transmission electron,microscope(TEM)and X-ray photoelectron spectrometer(XPS).In addition,electrocatalytic tests show that the overpotential of hydrogen evolution reaction(HER)and oxygen evolution reaction(OER)of Fe_(2)P/Fe_(3)C@C-800 in alkaline electrolyte at 10 mA/cm2 is 179 mV and 245 mV,respectively,and it can maintain the stability of 100 h(HER)and 50 h(OER).