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首页> 外文期刊>RSC Advances >St?ber synthesis of salen-formaldehyde resin polymer- and carbon spheres with high nitrogen content and application of the corresponding Mn-containing carbon spheres as efficient electrocatalysts for the oxygen reduction reaction
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St?ber synthesis of salen-formaldehyde resin polymer- and carbon spheres with high nitrogen content and application of the corresponding Mn-containing carbon spheres as efficient electrocatalysts for the oxygen reduction reaction

机译：ST？BER甲醛树脂聚合物和碳球的合成，具有高氮含量和应用相应的Mn的碳球作为氧还原反应的有效电催化剂

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Salen-formaldehyde (SF) resin polymer spheres were synthesized by the St?ber method from 4,4′-dihydroxysalen ( N , N ′-bis-(4-hydroxysalicylidene)-ethylenediamine; a tetradentate N _(2) O _(2) Schiff base ligand) and formaldehyde. The salen precursor was prepared by condensation of ethylenediamine with 2,4-dihydroxybenzaldehyde in methanol. The SF resin colloidal spheres were also prepared by using Pluronic F127 and ammonia as a porogenic agent and catalyst, respectively (SF-P). In addition, corresponding Mn( II )-coordinated polymer spheres of the SF-P were synthesized (SF-P-Mn( II )). Corresponding monodispersed carbon spheres of all of the abovementioned samples were also obtained by pyrolysis technique. All of the products were characterized with conventional microscopic and spectroscopic techniques, as well as other physical methods such as BET analysis. It was found that carbonization of the SF resin spheres results in carbon spheres with specific surface areas in the range of 499–528 m ~(2) g ~(?1) and average pore sizes in the range of 2.58–3.08 nm. Nitrogen content of the SF-MW _(HT) (obtained hydrothermally in a methanol/water mixture), and SF-P-C@Mn (obtained from carbonization of SF-P-Mn( II )) samples were as high as 27.5 wt% and 35.02 wt%, respectively. Finally, a glassy carbon electrode (GCE) modified with SF-P-C@Mn (SF-P-C@Mn/GCE) was prepared and its electrocatalytic activity was evaluated for oxygen reduction reaction (ORR) by linear sweep voltammetry (LSV). The LSV results showed that the SF-P-C@Mn/GCE has a higher current density and a lower negative potential in the ORR compared to GCE.
机译：通过STα-二羟基（N，N' - （4-羟基丙烯） - 乙二胺的ST-BER方法合成Salen-甲醛（SF）树脂聚合物球体;四烯烃N _（2）O _（ 2）Schiff Base配体）和甲醛。通过用甲醇中的2,4-二羟基苯甲醛缩合乙二胺，制备盐前体。通过使用Pluronic F127和氨作为致致剂和催化剂，也制备SF树脂胶体球体，分别制备（SF-P）。另外，合成了SF-P的相应Mn（II）的CoOctinated聚合物球（SF-P-Mn（II））。通过热解技术也得到了所有上述样品的相应单分散碳球。所有产品都以常规的微观和光谱技术为特征，以及其他物理方法，如BET分析。结果发现，SF树脂球的碳化导致具有499-528m〜（2）G〜（α1）的特异性表面积的碳通球，平均孔径在2.58-3.08nm的范围内。 SF-MW _（HT）的氮含量（在甲醇/水混合物中获得水热量），和SF-PC @ Mn（由SF-P-Mn（II）的碳化）样品高达27.5wt％分别为35.02重量％。最后，制备用SF-P-C @ Mn（SF-P-C @ Mn / GCE）改性的玻璃碳电极（GCE），并通过线性扫描伏安法（LSV）评价其电催化活性的氧还原反应（ORR）。 LSV结果表明，与GCE相比，SF-P-C @ Mn / GCE具有更高的电流密度和较低的负电位。

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