New Electro-Fenton Gas Diffusion Cathode based on Nitrogen-doped Graphene@Carbon Nanotube Composite Materials
New Electro-Fenton Gas Diffusion Cathode based on Nitrogen-doped Graphene@Carbon Nanotube Composite Materials
复制标题
基于氮掺杂石墨烯@碳纳米管复合材料的新型电芬顿气体扩散阴极
DOI：
10.1016/j.electacta.2015.12.185
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发表时间：
2016-03-10
影响因子：
6.6
通讯作者：
Wang, Yi
中科院分区：
文献类型：
--
作者：
Liu, Tianfu;Wang, Kun;Wang, Yi
为了开发高效节能的电芬顿工艺，制备了一种新型的氮掺杂石墨烯@碳纳米管复合材料（N-G@CNT），对其进行了表征和氧还原反应（ORR）研究，并将其用于邻苯二甲酸二甲酯（DMP）的降解。发现N-G@CNT对H2 O2产生的ORR活性在增加的电流密度和更正的起始电位方面显著改善。此外，据我们所知，-0.2V（相对于SCE）是最低阴极电势，其中NH 4在NG@CNT GDE（气体扩散电极）上比在i）石墨GDE或ii）石墨烯GDE或iii）CNT GDE上更有效地降解。实验测得的表观降解速率常数为0.0322min（-1），分别是上述三种GDE的14、19和54倍。还发现，在较低电位（-0.2V）下，在所研究的GDE上，用于CNT的半衰期降解的能量消耗（EC）如下（以J mg（-1）计）：N-G@CNT = 2.56 <石墨= 10.61 <石墨烯= 12.23 < CNT = 38.35。较低的起始电势可以归因于石墨烯和CNT之间的桥接和氮掺杂。所制备的N-G@CNT具有高活性和理想的稳定性，并且代表了用于节能废水处理的电芬顿阴极的潜在候选材料。(C)2016爱思唯尔有限公司版权所有
For the development of a highly active and energy-effective electro-Fenton process, a novel nitrogen-doped graphene@carbon nanotube composite material (N-G@CNT) is prepared, characterized, investigated for the oxygen reduction reaction (ORR), and employed for dimethyl phthalate (DMP) degradation in aqueous solution. It is found that N-G@CNT's ORR activity towards H2O2 production is significantly improved in terms of increased current density and more positive onset potential. Moreover, -0.2 V (vs. SCE) is the lowest cathodic potential, to our best knowledge, in which DMP degrades over NG@CNT GDE (Gas Diffusion Electrode) more effectively than over: i) graphite GDE or ii) graphene GDE or iii) CNT GDE. The apparent rate constant of DMP degradation is found to be 0.0322 min(-1), about 14, 19, and 54 times higher than those measured on the above three types of GDEs, respectively. It is also found that, at the lower potential (-0.2 V), the energy consumption (EC) for the half-life time degradation of DMP over the studied GDEs, is as follows (in J mg(-1)): N-G@CNT = 2.56 < graphite = 10.61 < graphene = 12.23 < CNT = 38.35. The lower onset potential could be attributed to both the bridge between graphene and CNT and the nitrogen doping. The as-prepared N-G@CNT exhibits high activity and desirable stability, and represents a potential candidate material as electro-Fenton cathode for energy-effective wastewater treatment. (C) 2016 Elsevier Ltd. All rights reserved.