摘要
The development of high-efficiency,earth-abundant,and durable oxygen reduction reaction(ORR)electrocatalysts is desirable for commercialization of fuel cells,but remains a great challenge.Herein,we develop a facile and practical method for preparing efficient ORR electrocatalysts by directly growing metal-organic frameworks(MOFs)Co2(INA)4·DMF(HINA=isonicotinic acid,1)and{[Co2(TPI)(H2O)2(OH)]·DMF}(H3 TPI=5-(4-(tetrazol-5-yl)phenyl)isophthalic acid,2)on the commercial carbon(CC).The resulting MOF/CCs were further pyrolysis to functionalize CC by trace amount of cobalt oxides,resulting in two composites Cal-MOF-1/CC(3)and Cal-MOF-2/CC(4),which can be used as efficient electrocatalysts for ORR with remarkable stability and large diffusion-limited current density,even superior to that of commercial Pt/C catalysts.Detail study reveals that the linking ligands with different structure and nitrogen contents in 1 and 2 smartly influence the types of cobalt oxides.The catalytic activity of Co3O4/CoO/Co co-doped CC in 4 was much enhanced compared to that of CoO-doped CC in 3.
The development of high-efficiency, earth-abundant, and durable oxygen reduction reaction（ORR）electrocatalysts is desirable for commercialization of fuel cells, but remains a great challenge. Herein, we develop a facile and practical method for preparing efficient ORR electrocatalysts by directly growing metal-organic frameworks（MOFs） Co2（INA）4·DMF（HINA = isonicotinic acid, 1） and {[Co2（TPI）（H2O）2（OH）]·DMF}（H3 TPI = 5-（4-（tetrazol-5-yl） phenyl） isophthalic acid, 2） on the commercial carbon（CC）. The resulting MOF/CCs were further pyrolysis to functionalize CC by trace amount of cobalt oxides,resulting in two composites Cal-MOF-1/CC（3） and Cal-MOF-2/CC（4）, which can be used as efficient electrocatalysts for ORR with remarkable stability and large diffusion-limited current density, even superior to that of commercial Pt/C catalysts. Detail study reveals that the linking ligands with different structure and nitrogen contents in 1 and 2 smartly influence the types of cobalt oxides. The catalytic activity of Co3O4/CoO/Co co-doped CC in 4 was much enhanced compared to that of CoO-doped CC in 3.
基金
supported by the National Natural Science Foundation of China(Nos.21722104,21671032)
Natural Science Foundation of Tianjin City of China(Nos.18JCJQJC47700,17JCQNJC05100)
Research Foundation of Thirteenth Five Years of Jilin Educational Committee(No.[2015]0056/JJKH20170605KJ)
the Scientific Research Foundation for the Returned Overseas Scholars
