Shen Jianhua, Meng Lu, Liu Yanyan, Chen Cheng, Zhu Yihua, Li Chunzhong
Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology Shanghai 200237 P. R. China
School of Environmental and Materials Engineering, College of Engineering, Shanghai Polytechnic University Shanghai 201209 China.
RSC Adv. 2018 Jun 18;8(39):22193-22198. doi: 10.1039/c8ra03245a. eCollection 2018 Jun 13.
Production of bifunctional catalysts for catalyzing both the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is highly advisable but challenging with respect to the applications of these catalysts in renewable energy conversion and storage technologies. Herein, we prepared highly reactive and stable cobalt-embedded nitrogen-rich carbon nanosheets (Co-N/CNs). Based on density functional theory (DFT) calculations and experiments, the as-prepared Co-N/CNs showed outstanding catalytic activities toward both OER and ORR. The optimized Co-N/CNs-800 catalyst revealed outstanding bifunctional catalytic activities for both ORR and OER with high catalytic efficiency and long-term durability, which were even comparable with those of the state-of-the-art Pt/C and RuO catalysts. Furthermore, we observed that different cobalt salt precursors affected the size of Co nanoparticles, and both ORR and OER catalytic activities displayed completely consistent variations (sulfate < acetate < chloride < nitrate). An all-solid-state Al-air battery device comprising this hybrid catalyst showed superior performance when compared with the device containing the Pt/C catalyst.
制备用于催化氧还原反应（ORR）和析氧反应（OER）的双功能催化剂对于这些催化剂在可再生能源转换和存储技术中的应用而言是非常可取的，但具有挑战性。在此，我们制备了高活性且稳定的钴嵌入富氮碳纳米片（Co-N/CNs）。基于密度泛函理论（DFT）计算和实验，所制备的Co-N/CNs对OER和ORR均表现出出色的催化活性。优化后的Co-N/CNs-800催化剂对ORR和OER均显示出出色的双功能催化活性，具有高催化效率和长期耐久性，甚至与最先进的Pt/C和RuO催化剂相当。此外，我们观察到不同的钴盐前驱体会影响Co纳米颗粒的尺寸，并且ORR和OER催化活性均呈现出完全一致的变化（硫酸盐＜乙酸盐＜氯化物＜硝酸盐）。与包含Pt/C催化剂的装置相比，包含这种混合催化剂的全固态铝空气电池装置表现出优异的性能。
