- 2. 北京科技大学
- 3. 北京科技大学土木与环境工程学院
- 4. 北京科技大学材料科学与工程学院
Operando X-ray Study on the Service Behavior of Catalytic Materials Based on Synchrotron Radiation
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Abstract: Due to the energy and environmental issues in human society, hydrogen has become more and more important and the electrocatalytic water splitting has been considered the most ideal way to solve these energy issues. However, it has been widely acknowledged that most electrocatalysts would undergo a structural evolution during the service condition and the understanding of catalyst service behavior is still deficient. Using the operando characterization technology to study the dynamic structure evolution of catalysts is necessary to design highly active catalysts. Today, The development of synchrotron radiation devices is at an important stage, the synchrotron radiation based X-ray characterization, which has high energy, large flux, and great collimation compared with ordinary laboratory X-ray source, can capture the precise structure of catalytic materials. This review introduces the development status of synchrotron radiation devices and the basic principles of operando X-ray absorption spectroscopy, X-ray diffraction spectroscopy and X-ray photoelectron spectroscopy based on synchrotron radiation. In addition, we highlight the study of dynamic service behavior for water splitting catalysts under real conditions and list a variety of operando research for typical water splitting catalysts such as NiFe hydroxide/(oxy)hydroxides, perovskite oxides, spinel oxides and noble-metal-based catalysts. These operando x-ray technology deepens the understanding of the catalyst reaction mechanism and provides a basis for building dynamic structure-performance correlation of catalysts. Moreover, we summarize the problems and challenges of these operando X-ray based techniques when facing the complex electrochemical environment, and proposes the prospect of advanced synchrotron radiation facility and operando X-ray characterization. With the development of the next-generation synchrotron radiation facility, we believe that making full use of advanced X-ray light source to study the dynamic structure-activity correlation of catalytic materials throughout the whole life cycle to achieve the precise design and synthesis of complex pre-catalysts will push the development of this field to a much more refined and controllable stage.