聚合金属卟啉催化剂的制备及其在金属空气电池中的应用
发布时间：2019-06-04 23:47
【摘要】：金属空气燃料电池是非常有前景的动力源，它不经过卡诺循环直接把化学能转化为电能，它的理论电压高、比能量高、成本低、与环境相容性好，因此受到极大的关注。在金属空气电池中，阴极上的催化剂起到催化氧还原反应作用，是影响电池性能的关键因素。由于简单的单体卟啉类催化剂催化活性相对较低，稳定性差，在此基础上， 我们用新工艺设计并合成了金属聚合卟啉类催化剂（PTPPM/C）。用红外光谱和紫外光谱表征了金属聚合卟啉的结构，结果表明，所合成的产物为目标化合物。用差热分析（TG）联合紫外光谱，对聚合卟啉的热稳定性进行研究。结果显示，金属聚合卟啉在600℃以下并不分解，具有良好的热稳定性。将PTPPM固载到活性炭表面得到PTPPM/C催化剂，用旋转圆盘电极（RDE）和电化学工作站探究催化剂的最佳制备工艺条件，结果表明两类催化剂（PTPPPt/C，，PTPPPd/C）的最佳制备参数相同：活化温度600℃，MN4载量6wt%。最佳制备参数下得到的PTPPPt/C和PTPPPd/C催化剂在氧气饱和的0.5mol/L的H2SO4溶液中，其初始还原电位分别为0.85，0.84Vvs.RHE，转移电子数分别为3.85和3.83。用TEM、XRD和XPS对催化剂表面形貌状态，微观结构和催化剂组成价态做了研究。测试结果显示，当金属聚合卟啉催化剂在600℃均匀负载到活性碳的表面，催化剂为无定形结构，催化活性中心为在卟啉环中的金属离子。金属空气电池阴极催化层中催化剂活性中心MN4为1mg/cm2。分别对空气电极和金属空气电池进行研究。从电流-电位曲线和功率曲线可以得出：PTPPM/C催化剂是一种高性能的金属空气电池阴极催化剂，其性能与Pt/C催化剂较接近。恒电流不间断放电电池稳定性测试表明，连续500min放电，金属空气电池性能 几乎不衰减，说明PTPPM/C催化剂催化的金属空气电池具有稳定的放电性能。
[Abstract]:Metal air fuel cell is a very promising power source. It converts chemical energy into electric energy directly without Carnot cycle. It has high theoretical voltage, high specific energy, low cost and good compatibility with the environment, so it has received great attention. In metal air batteries, the catalyst on the cathode plays a catalytic role in oxygen reduction, which is the key factor affecting the performance of metal air batteries. Because of the relatively low catalytic activity and poor stability of simple monomer porphyrin catalysts, we designed and synthesized metal polymeric porphyrin catalysts (PTPPM/C) by a new process. The structure of metallopolytoporphyrin was characterized by IR and UV spectra. The results showed that the synthesized product was the target compound. The thermal stability of polyporphyrin was studied by differential thermal analysis (TG) combined with ultraviolet spectroscopy. The results show that metalloporphyrins do not decompose below 600 鈩
本文编号：2493090
[Abstract]:Metal air fuel cell is a very promising power source. It converts chemical energy into electric energy directly without Carnot cycle. It has high theoretical voltage, high specific energy, low cost and good compatibility with the environment, so it has received great attention. In metal air batteries, the catalyst on the cathode plays a catalytic role in oxygen reduction, which is the key factor affecting the performance of metal air batteries. Because of the relatively low catalytic activity and poor stability of simple monomer porphyrin catalysts, we designed and synthesized metal polymeric porphyrin catalysts (PTPPM/C) by a new process. The structure of metallopolytoporphyrin was characterized by IR and UV spectra. The results showed that the synthesized product was the target compound. The thermal stability of polyporphyrin was studied by differential thermal analysis (TG) combined with ultraviolet spectroscopy. The results show that metalloporphyrins do not decompose below 600 鈩
本文编号：2493090
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