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首页> 外文期刊>RSC Advances >A sandwich-type catalytic composite reassembled with a birnessite layer and metalloporphyrin as a water oxidation catalyst
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A sandwich-type catalytic composite reassembled with a birnessite layer and metalloporphyrin as a water oxidation catalyst

机译：夹着水钠锰矿层和金属卟啉作为水氧化催化剂的三明治型催化复合材料

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High purity birnessite was synthesized and exfoliated into a negatively charged monolayer structure. A positively charged 5, 10, 15, 20-tetrakis (4-aminophenyl) manganese porphyrin (MnTAPP) was synthesized. Driven by the electrostatic force and the coordination effect of the amino nitrogen on the manganese ion in birnessite, the single-layer birnessite was reassembled with MnTAPP, forming a new sandwich-type catalytic composite MnTAPP@bir. The structure and chemical properties of the composite were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Brunauer–Emmett analysis (BET). Electrocatalytic studies showed that the MnTAPP@bir exhibited an overpotential for water oxidation of 450 mV (at 10 mA cm ~(?2) ) and a Tafel slope of 121.5 mV dec ~(?1) compared to birnessite with 700 mV (at 10 mA cm ~(?2) ) and 230 mV dec ~(?1) . Impedance spectroscopy results suggested that the charge transfer resistivity of MnTAPP@bir was significantly lower than that of birnessite, suggesting that MnTAPP in the interlayer increased the conductivity of birnessite. Through a chronoamperometry test, the new material also showed excellent stability within 4000 s.
机译：合成了高纯度水钠锰矿，并剥离成带负电的单层结构。合成了带正电的5、10、15、20-四（4-氨基苯基）锰卟啉（MnTAPP）。在静电作用下和氨基氮对水钠锰矿中锰离子的配位作用的驱动下，单层水钠锰矿与MnTAPP重新组装，形成了一种新型的三明治型催化复合物MnTAPP @ bir。通过X射线衍射（XRD），傅立叶变换红外光谱（FTIR），扫描电子显微镜（SEM），透射电子显微镜（TEM），热重分析（TGA）和Brunauer-Emmett表征复合材料的结构和化学性质。分析（BET）。电催化研究表明，与700mV的水钠锰矿（在10 mA时，MnTAPP @ bir的水氧化过电势为450 mV（在10 mA cm〜（？2）时）和Tafel斜率为121.5 mV dec〜（？1）相比，Tafel斜率更高。 mA cm〜（？2））和230 mV dec〜（？1）。阻抗谱分析结果表明，MnTAPP @ bir的电荷转移电阻率明显低于水钠锰矿，表明夹层中的MnTAPP增加了水钠锰矿的电导率。通过计时电流法测试，新材料还显示出4000 s内的出色稳定性。

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