PEM析氧催化剂的表界面氧的调控及其析氧性能的研究

质子交换膜电解技术的高功率密度使未来利用电化学技术制造低成本可再生能源成为可能。如何同时提高PEM析氧催化剂的活性和稳定性，突破两者之间的反比例关系，是十分重要也非常困难的科学问题。受到晶格氧对烧绿石结构PEM析氧催化剂活性和稳定性影响的启发，本项目提出合金元素对PEM析氧催化剂的表界面氧的调控，以达到活性和稳定性的双效提升的研究思路。合金元素能够改变表界面氧的状态如：氧化状态、氧空位浓度、配位环境、相结构、费米能级、电子能带结构、键的共价性、与氧的结合力等等，还涉及到OER反应过程由吸附氧的反应路径（AEM）向晶格氧的反应路径（LOM）的改变。我们将结合课题组的科研优势，实现PEM析氧催化剂的宏观导电性；通过合金元素的调整实现电化学活性与稳定性的的双效提升；研究活性结构演化过程，评价表界面氧的抗氧化腐蚀性和PEM析氧催化剂的长期稳定性。

Thanks to the high power density of PEM electrolyzer, it is possible to produce low-cost renewable fules by electrochemical technology in the future. There exits an important aswellas a difficult scientific issue, that is how to simultaneously improve the activity and stability of PEM catalysts for oxygen evolution reaction, and how to break through the inverse relationship between them. Inspired by the lattice oxygen effect on pyrochlore structure catalysts, we proposes an alloy-effect on the surface and interface oxygen of PEM catalyst, so as to achieve the improvement of activity and stability. Alloy-effect could change the state of surface oxygen, such as oxidation state, oxygen vacancy concentration, oxygen coordination, catalyst phase, Fermi energy, electronic band structure, covalence, etc. It may also be related to the change of OER mechanism between AEM and LOM. Based on our research advantages, we in this project would realize the macro-conductivity of PEM catalyst; through the alloy-effect improve the electrochemical activity and stability; and evaluate the corrosion resistance and the long-term stability of PEM catalyst.