Sulfur-Doped Porphyrinic Carbon Nanostructures Synthesized with Amorphous MoS2 for the Oxygen Reduction Reaction in an Acidic Medium.
Sulfur-Doped Porphyrinic Carbon Nanostructures Synthesized with Amorphous MoS2 for the Oxygen Reduction Reaction in an Acidic Medium.
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DOI：
10.1002/cssc.201700147
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发表时间：
2017-05
期刊：
影响因子：
8.4
通讯作者：
Hyun-Suk Park;Sang-Beom Han;Da-hee Kwak;Gyuhun Lee;In-Ae Choi;Do-Hyoung Kim;Kyeng-Bae Ma;Min-Cheol Kim;H. Kwon;Kyung‐Won Park
中科院分区：
文献类型：
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作者：
Hyun-Suk Park;Sang-Beom Han;Da-hee Kwak;Gyuhun Lee;In-Ae Choi;Do-Hyoung Kim;Kyeng-Bae Ma;Min-Cheol Kim;H. Kwon;Kyung‐Won Park
为了开发掺杂碳纳米结构作为非贵金属阴极催化剂，以SBA-15和5，10，15，20-四（4-甲氧基苯基）卟啉-氯化铁（III）为原料，以不同比例的非晶态MoS 2为前驱体，合成了纳米复合材料。从各种分析中发现，在N2气氛下在900 °C下热解期间，无定形MoS 2前体分解成Mo和S，促进了具有MoC的石墨烯片状碳的形成和碳中硫的掺杂。在由10wt%MoS2前体形成的纳米复合材料（表示为Mo/S/PC-10）中，大部分MoS 2分解，从而形成S掺杂的碳，其在MoC相上生长而没有结晶MoS 2。此外，Mo/S/PC-10在氧还原反应中表现出更好的性能（在0.9 V下的比活性为1.23 mA cm-2，半波电位为0.864 V）比商业Pt催化剂，由于杂原子掺杂的碳纳米结构具有相当高的比表面积。在80 °C和环境压力下测量的单电池性能的极化曲线中，Mo/S/PC-10作为阴极催化剂在0.6 V下表现出314 mW cm-2的最佳功率密度和280 mA cm-2的电流密度。
To develop doped carbon nanostructures as non-precious metal cathode catalysts, nanocomposites were synthesized by using SBA-15 and 5,10,15,20-tetrakis(4-methoxyphenyl)porphyrin-iron(III) chloride with different ratios of amorphous MoS2 precursor. From various analyses, it was found that, during pyrolysis at 900 °C under an N2 atmosphere, the amorphous MoS2 precursor decomposed into Mo and S, facilitating the formation of graphene sheet-like carbon with MoC and doping of sulfur in the carbon. In the nanocomposite formed from 10 wt % MoS2 precursor (denoted as Mo/S/PC-10), most of the MoS2 was decomposed, thus forming S-doped carbon, which was grown on the MoC phase without crystalline MoS2 . Furthermore, Mo/S/PC-10 exhibited better performance in the oxygen reduction reaction (specific activity of 1.23 mA cm-2 at 0.9 V and half-wave potential of 0.864 V) than a commercial Pt catalyst, owing to a heteroatom-doped carbon nanostructure with a fairly high specific surface area. In the polarization curve of the unit-cell performance measured at 80 °C under ambient pressure, Mo/S/PC-10 as a cathode catalyst exhibited an optimal power density of 314 mW cm-2 and a current density of 280 mA cm-2 at 0.6 V.