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首页> 外文期刊>RSC Advances >Microwave-assisted synthesis of nitrogen-doped activated carbon as an oxygen reduction catalyst in microbial fuel cells
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Microwave-assisted synthesis of nitrogen-doped activated carbon as an oxygen reduction catalyst in microbial fuel cells

机译：微波辅助合成微生物燃料电池中作为氧还原催化剂的氮掺杂活性炭

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摘要

A nitrogen-doped activated carbon (NDAC) as a cathode catalyst in microbial fuel cells (MFCs) was synthesized by a microwave-assisted method using ammonium carbonate as a nitrogen source. The prepared NDAC showed a higher BET surface area of up to 1717.8 m(2) g(-1) and a total pore volume of 0.79 cm(3) g(-1). X-ray photoelectron spectroscopic analysis demonstrated that N was successfully doped on the surface of AC in three species, corresponding to pyrrolic N, pyridinic N and pyridine-N-oxide. Compared with untreated AC, the NDAC exhibited better electrocatalytic activity for the oxygen reduction reaction in rotating disk electrode tests, with a current density of 12.4 mA cm(-2) at a set potential of -0.8 V (vs. SCE) (AC, 11.3 mA cm(-2)) and an electron transfer number of 3.14 (AC, n = 2.83). MFCs equipped with a NDAC cathode achieved a higher maximum power density of 471 +/- 11 mW cm(-2) when fed with domestic wastewater, which was 1.3 times higher than that of the AC cathode. It also displayed long-term operation stability when dealing with real wastewater, indicating a promising cathode catalyst for MFCs towards practical applications.
机译：通过微波辅助方法，以碳酸铵为氮源，合成了微生物燃料电池（MFCs）中作为阴极催化剂的氮掺杂活性炭（NDAC）。制备的NDAC显示更高的BET表面积高达1717.8 m（2）g（-1），总孔体积为0.79 cm（3）g（-1）。 X射线光电子能谱分析表明，在AC的表面上成功地掺杂了三种氮，分别对应于吡咯N，吡啶二氮和吡啶-N-氧化物。与未处理的交流电相比，NDAC在旋转圆盘电极测试中对氧还原反应表现出更好的电催化活性，在-0.8 V（vs.SCE）的设定电势下电流密度为12.4 mA cm（-2）（AC， 11.3 mA cm（-2））和3.14（AC，n = 2.83）的电子转移数。配备有NDAC阴极的MFC在生活污水中进料时可达到471 +/- 11 mW cm（-2）的更高的最大功率密度，是AC阴极的1.3倍。在处理实际废水时，它还显示出长期的运行稳定性，这表明有希望将MFC应用于实际应用中的阴极催化剂。

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