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The huge importance of sustainable energy makes the research of the green and environmental hydrogen energy active in the world. Energy conversion and storage technologies （such as fuel cells or water electrolysis） are capable of readily promoting the interconversion between hydrogen and electric power， for which the development of efficient and stable electrocatalysts is prerequisite. Ordered intermetallic compounds are considered as superior electrocatalysts for energy conversion storage technologies and ideal models for studying the relationship between catalytic activity and structure due to uniform distribution of active sites on surface， welldefined stoichiometry and the better control of the local geometry and electronic structure of metal atoms， compared to disordered alloys as their counterparts. In this review， the challenges of catalysts with regard to hydrogenelectric conversion and the advantages of intermetallic compounds in electrocatalysis are firstly introduced. Secondly， research progress on intermetallic compounds electrocatalysts applied in the interconversion between hydrogen and electric power is mainly discussed from the perspective of activity and stability. Finally， the future development prospects of intermetallic electrocatalysts are summarized and prospected. [ABSTRACT FROM AUTHOR]

With the advantages of low noise, low infrared signature and high dependability, the fuel cells can be used for the military vehicles and field power supply. The reaction characteristics of proton exchange membrane fuel cell ( PEMFC) system are affected by self-configuration, environment and other factors. For the limit of sensor technology, the inner temperature and humidity of the fuel system can't be measured immediately, and its reaction characteristics are different every time. System model is difficult to build, its inner humidity can't be well controlled using a traditional control method. For 3 kW PEMFC system, a simple control system was built to control the humidity dynamically, which keeps the humidity changing up and down alternately in dynamic threshold. The limit of system model is get rid of by this method, avoiding the humidity excursion caused by steadily control. Finally the feasibility of this control method was validated through experiment. [ABSTRACT FROM AUTHOR]