摘要
以Mn(Ac)_2和Co(Ac)_2作为前驱体,导电碳Ketjenblack (KB)作为负载碳源,采用水解-水热法制备氮掺杂的MnCo_2O_4/N-KB催化剂材料,对其结构特征和碱性溶液中氧还原反应的催化性能进行表征,并进一步分析其氧还原反应活性。结果表明:MnCo_2O_4/N-KB催化剂的形态是KB骨架上生长纳米级MnCo_2O_4,并且在N-KB和MnCo_2O_4之间形成化学耦合,产生协同作用,有效提高了MnCo_2O_4/N-KB催化剂的氧还原活性。MnCo_2O_4与N-KB的质量比为1∶9时,MnCo_2O_4/N-KB催化剂在O_2饱和0.1mol·L^(-1)KOH溶液中对氧还原反应的电催化性能最佳,反应的极限电流密度为5.7 mA·cm^(-2),半波电位接近0.81 V,电子转移数为4。在相同负载量下,MnCo_2O_4/N-KB催化剂相比商用Pt/C(电流密度5.2 mA·cm^(-2),半波电位0.83 V)有着更高的极限电流密度和耐久性。
MnCo2O4/N-KB catalysts was prepared by hydrolysis-hydrothermal method,in which Mn(Ac)2 and Co(Ac)2 were used as precursors and nitrogen doped conductive carbon Ketjenblack(KB)was used as the carbon source.The microstructure of the MnCo2O4/N-KB catalysts and its catalytic performance for oxide reduction reaction were studied.The results showed that chemical coupling was formed between N-KB and MnCo2O4.It produced synergistic effect and effectively improved the oxygen reduction activity of MnCo2O4/N-KB catalyst.When the mass ratio of MnCo2O4 to N-KB was 1∶9,the limiting current density of the reaction was 5.7 mA·cm-2 and the half wave potential was close to 0.81 V.MnCo2O4/N-KB catalyst obtained the best electrocatalytic performance for oxygen reduction.Comparing to the commercial Pt/C catatlyst with a current density of 5.2 mA·cm-2 and a half-wave potential 0.83 V,MnCo2O4/N-KB catalyst had a highly active oxygen reduction with higher ultimate current density and durability under the same capacity condition.
作者
冯艳
吴剑波
张晓玲
彭超群
王日初
FENG Yan;WU Jian-Bo;ZHANG Xiao-Ling;PENG Chao-Qun;WANG Ri-Chu(School of Materials Science and Engineering,Central South University,Changsha 410083,China)
出处
《无机化学学报》
SCIE
CAS
CSCD
北大核心
2019年第4期569-579,共11页
Chinese Journal of Inorganic Chemistry
基金
湖南省自然科学基金(No.2016JJ2147)资助项目
关键词
氧还原反应
锰钴尖晶石
水热反应
电化学
oxygen reduction reaction
manganese cobalt spinel
hydrothermal synthesis
electrochemistry
