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Platinum quantum dots enhance electrocatalytic activity of bamboo-like nitrogen doped carbon nanotubes embedding Co-MnO nanoparticles for methanol/ethanol oxidation
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2021-01-20 , DOI: 10.1016/j.jcis.2021.01.045
Mingmei Zhang , Zixiang Song , Zhuokai Wang , An Wang , Guisheng Zhu , Shouyan Shao

Interaction of multi-active components can effectively maximize the overall catalytic ability of alcohol fuel cells. Herein, the self-assembled nitrogen doped carbon nanotubes (NCNTs) containing Co-MnO composite (Co-MnO/NCNTs) are successfully synthesized using dihydrodiamine as carbon and nitrogen source through one-step synthesis. In order to further improve the catalytic activity of Co-MnO/NCNTs for alcohol oxidation, small amounts of platinum quantum dots are uniformly loaded on Co-MnO/NCNTs formation of quaternary hybrid (named Pt/Co-MnO/NCNTs) during microwave reduction stage. Notably, the prepared Pt/Co-MnO/NCNTs hybrids possess the excellent methanol and ethanol oxidation mass current density of 1775.4 and 1112.8 mA mg−1 in alkaline condition, which are 3.6 and 2.25 times higher than that of Pt/C catalysts, respectively. The current density of ethanol catalytic oxidation is lower than that of methanol, which may be due to the partial oxidation of acetyl (the intermediate product of ethanol) on the Pt (1 1 1) crystal surface. More importantly, CO oxidation experiments reveal that strong electronic synergistic effect between MnO and Pt quantum dot can greatly improve the CO anti-poisoning ability. Another significant advantage of Pt/Co-MnO/NCNTs is that low platinum loading leads to low cost effective, which demonstrates that the modification non-noble metal catalysts with a few noble metals quantum dots is a promising choice to mass produce high performance catalyst with remarkably boosting electrocatalytic activity for alcohol oxidation.



中文翻译:

铂量子点增强嵌入Co-MnO纳米粒子的竹状氮掺杂碳纳米管对甲醇/乙醇氧化的电催化活性

多种活性成分的相互作用可以有效地最大化酒精燃料电池的整体催化能力。在此,以二氢二胺为碳源和氮源,通过一步合成,成功合成了含Co-MnO复合材料(Co-MnO / NCNT)的自组装氮掺杂碳纳米管(NCNT)。为了进一步提高Co-MnO / NCNTs对醇氧化的催化活性,在微波还原过程中,将少量铂量子点均匀地负载在四元杂化体(称为Pt / Co-MnO / NCNTs)的Co-MnO / NCNTs形成上。阶段。值得注意的是,所制备的Pt / Co-MnO / NCNTs杂化物具有优异的甲醇和乙醇氧化质量电流密度,分别为1775.4和1112.8 mA mg -1在碱性条件下,分别比Pt / C催化剂高3.6和2.25倍。乙醇催化氧化的电流密度低于甲醇的电流密度,这可能是由于Pt(1 1 1)晶体表面上的乙酰基(乙醇的中间产物)部分氧化所致。更重要的是,CO氧化实验表明MnO和Pt量子点之间强大的电子协同作用可以大大提高CO的抗中毒能力。Pt / Co-MnO / NCNT的另一个显着优势是低铂负载量导致低成本,这表明具有少量贵金属量子点的改性非贵金属催化剂是批量生产高性能含Pt / Co-MnO / NCNT的高性能催化剂的有希望的选择。大大提高了醇氧化的电催化活性。

更新日期:2021-02-03
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