| 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 |
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| 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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