Kodali Mounika, Santoro Carlo, Herrera Sergio, Serov Alexey, Atanassov Plamen
Department of Chemical and Biological Engineering, Center Micro-Engineered Materials (CMEM), MSC01 1120 University of New Mexico Albuquerque, New Mexico 87131, USA.
J Power Sources. 2017 Oct 31;366:18-26. doi: 10.1016/j.jpowsour.2017.08.110.
M1-M2-N-C bimetallic catalysts with M1 as Fe and Co and M2 as Fe, Co, Ni and Mn were synthesized and investigated as cathode catalysts for oxygen reduction reaction (ORR). The catalysts were prepared by Sacrificial Support Method in which silica was the template and aminoantipyrine (AAPyr) was the organic precursor. The electro-catalytic properties of these catalysts were investigated by using rotating ring disk (RRDE) electrode setup in neutral electrolyte. Fe-Mn-AAPyr outperformed Fe-AAPyr that showed higher performances compared to Fe-Co-AAPyr and Fe-Ni-AAPyr in terms of half-wave potential. In parallel, Fe-Co-AAPyr, Co-Mn-AAPyr and Co-Ni-AAPyr outperformed Co-AAPyr. The presence of Co within the catalyst contributed to high peroxide production not desired for efficient ORR. The catalytic capability of the catalysts integrated in air-breathing cathode was also verified. It was found that Co-based catalysts showed an improvement in performance by the addition of second metal compared to simple Co- AAPyr. Fe-based bimetallic materials didn't show improvement compared to Fe-AAPyr with the exception of Fe-Mn-AAPyr catalyst that had the highest performance recorded in this study with maximum power density of 221.8 ± 6.6 μWcm. Activated carbon (AC) was used as control and had the lowest performances in RRDE and achieved only 95.6 ± 5.8 μWcm when tested in MFC.
合成了以M1为铁和钴、M2为铁、钴、镍和锰的M1-M2-N-C双金属催化剂，并将其作为氧还原反应（ORR）的阴极催化剂进行研究。这些催化剂采用牺牲载体法制备，其中二氧化硅为模板，氨基安替比林（AAPyr）为有机前驱体。在中性电解质中，使用旋转环盘（RRDE）电极装置研究了这些催化剂的电催化性能。Fe-Mn-AAPyr的性能优于Fe-AAPyr，在半波电位方面，Fe-AAPyr比Fe-Co-AAPyr和Fe-Ni-AAPyr表现出更高的性能。同时，Fe-Co-AAPyr、Co-Mn-AAPyr和Co-Ni-AAPyr的性能优于Co-AAPyr。催化剂中钴的存在导致了高效ORR不需要的高过氧化物生成。还验证了集成在空气呼吸阴极中的催化剂的催化能力。结果发现，与简单的Co-AAPyr相比，添加第二种金属后，钴基催化剂的性能有所改善。除了本研究中性能最高、最大功率密度为221.8±6.6 μW/cm²的Fe-Mn-AAPyr催化剂外，铁基双金属材料与Fe-AAPyr相比没有表现出性能改善。使用活性炭（AC）作为对照，其在RRDE中的性能最低，在MFC中测试时仅达到95.6±5.8 μW/cm²。
