Special issue: Electrocatalyst and Electrocatalysis in Fuel Cells Preface
- 2016年第22卷 
随着世界石油储量的快速消耗以及由此带来的环境污染问题，世界各国都在积极寻找清洁无污染的可再生替代能源。以氢气的生产、储存、运输及利用为基础的“氢能经济”，对于摆脱人类对化石能源的依赖，实现可持续发展具有重要的意义。燃料电池作为将氢能直接转化为电能的洁净发电装置，是替代现有燃油发动机的最佳选择，不仅可以为现代交通工具提供理想的动力源，而且在移动通讯、潜艇、航空飞行器等方面也具有广阔的应用前景。In the last two decades, fuel cells captured worldwide attention as a promising renewable emission-free technology to meet the increasing demand of clean energy for stationary and transportation applications. Currently, platinum (Pt) is the most widely used electrocatalyst for both hydrogen oxidation reaction (HOR) at anode and oxygen reduction reaction (ORR) at cathode. However, the high-cost and scarcity of Pt have become the major challenges for commercialization of fuel cells. To overcome the above mentioned problems, great progress has been made in developing more active electrocatalysts on the basis of Pt-based and Pt-free electro catalysts. For the Pt-based electrocatalysts, composition, morphology, surfaces tructure, synthesis method, and post-treatment play significant roles in determining their activity and stability. In general, theactivity of Pt-based electrocatalysts can be enhanced by alloying Pt with other transition metals, forming a core-shell structure to improve the utilization of Pt atoms, forming and maintaining structures with only the highest active facets exposed to electrolytes, and creating a porous structure toincrease the surface area and strain. For the Pt-free electrocatalysts, a great progress has been made in the last decade, including heteroatom-containing carbon, transition metal oxides and transition metal macrocyclic compounds. The best performing non-precious catalysts even exceed those Pt-based catalysts in alkaline electrolytes. Generally, their ORR activity is less competitive in acidic media. To review the achievements that have been madein China and push forward the further development of electrocatalyst and electrocatalysis in fuel cells, some leading scientists were invited to contribute their recent advances and prospects in this field. I wish to take this opportunity to thank all the authors, reviewers, and editorial staffs of Journal of Electrochemistry for their professional contributions to this special issue.