氮掺杂MnCo2O4/N-KB的制备及氧还原催化性能
Preparation and Catalytic Performance for Oxygen Reduction of Nitrogen Doped MnCo2O4/N-KB
作者单位E-mail
冯艳 中南大学材料科学与工程学院, 长沙 410083  
吴剑波 中南大学材料科学与工程学院, 长沙 410083  
张晓玲 中南大学材料科学与工程学院, 长沙 410083  
彭超群 中南大学材料科学与工程学院, 长沙 410083  
王日初 中南大学材料科学与工程学院, 长沙 410083 wrc@csu.edu.cn 
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MnCo2O4/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:MnCo2O4/N-KB催化剂的形态是KB骨架上生长纳米级MnCo2O4,并且在N-KB和MnCo2O4之间形成化学耦合,产生协同作用,有效提高了MnCo2O4/N-KB催化剂的氧还原活性。MnCo2O4与N-KB的质量比为1:9时,MnCo2O4/N-KB催化剂在O2饱和0.1 mol·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,MnCo2O4/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。
关键词: 氧还原反应  锰钴尖晶石  水热反应  电化学
基金项目: 湖南省自然科学基金(No.2016JJ2147)资助项目。
Abstract: 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.
Keywords: oxygen reduction reaction  manganese cobalt spinel  hydrothermal synthesis  electrochemistry
投稿时间:2018-11-20 修订日期:2019-01-18
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冯艳,吴剑波,张晓玲,彭超群,王日初.氮掺杂MnCo2O4/N-KB的制备及氧还原催化性能[J].无机化学学报,2019,35(4):569-579.
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