【作者】 王程程； 付佳莉； 张勇； 张人杰；

【Author】 Chengcheng Wang;Jiali Fu;Yong Zhang;Renjie Zhang;Key Laboratory of Colloid and Interface Chemistry of the Ministry of Education of the P.R.China,Shandong University;

【机构】 胶体与界面化学教育部重点实验室(山东大学)；

【摘要】 本工作中我们将介绍快速¹、低温²催化降解有机污染物或电催化氧还原反应（ORR）³等方面性能突出的较大比表面锰氧化物(MnO_x)的研究进展。MnO_x纳米片径向排列出的高比例低价MnO_x微米绣球（HRLV-MOMs）室温催化H₂O₂降解亚甲基蓝（MB）效率达100.0mg·g^-1_HRLV-MOMs·min^-1,是已报道由MnO_x催化降解MB最大值的4倍,可在5 min催化降解100%MB;主要因为HRLV-MOMs体系快速生成大量羟基自由基·OH (74.0 mg·g^-1_HRLV-MOMs)（Fig.1a）。直径50-100 nm、长10μm、晶格暴露比7.8%的超长MnO₂纳米线5°C催化H₂O₂产生·OH53.80 mg g^-1_MnO2,自由基损耗低,可在30 min降解98.1%MB （Fig.1b）。我们还在窄间距氮掺杂碳（NC）层板阵列每个表面均匀生长了一层由富含氧空位（OVs）MnO_x纳米片组成的MnO_x纳米棱锥（MONPMs）（Fig.1c）;这种大比表面(409.7 m² g^-1)、高N/C原子比（10.62 at.%）和丰富OVs（38.3 at.%）的MONPMs/NC层板阵列比报道MnO_x和MnO_x/C复合材料呈现更优异的起始电位、扩散极限电流密度等ORR催化性能。更多还原

【Abstract】 We will contribute our approaches of manganese oxides (MnO_x )with increased surface exposure featuring efficient catalytic degradation of organic pollutants at fast speed or at low temperature as well as electrocatalysis in oxygen reduction reaction （ORR）.Microhydrangeas with a high ratio of low valence MnOx （HRLV-MOMs） radially aligned by MnOx nanosheets （HRLV-MOMs） catalyze H₂O₂ at room temperature to produce·OH radicals to degrade 100%of methylene blue （MB） in 5min at the efficiency of 100.0 mg·g^-1_HRLV-MOMs·min^-1,4 times that of the largest reported values by MnOx,mainly attributed to the fast formation of large amount of·OH radicals at the yield of 74.0mg·g^-1_HRLV-MOMs.MnO₂ nanowires with 50–100 nm in diameter are ultralong to 10μm with the exposed surface lattice of 7.8%,catalyzing H₂O₂ at 5°C to produce·OH radicals of 53.80 mg g^-1_MnO2,at low self-depletion to degrade 98.1%of MB in 30 min.We also obtain MnO_x nanopyramids（MONPMs） with uniform distribution,composed of MnO_x nanosheets vertically grown on the surface of nitrogen doped carbon （NC） laminate arrays with narrow laminate spacing.The large specific surface area (409.7 m² g^-1),large ratio of N/C atoms （10.62 at.%） and rich oxygen vacancies（OVs,38.3 at.%） yield MONPMs/NC better ORR performances like onset potential than those of reported MnO_x and MnO_x/carbon composited materials.更多还原