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Functionalized Fe/Ni@g-C3N4 nanostructures for enhanced trichloroethylene dechlorination and successive oxygen reduction reaction activity
Environmental Science: Nano ( IF 5.8 ) Pub Date : 2020-08-28 , DOI: 10.1039/d0en00450b
Rama Shanker Sahu, Ruey-an Doong

Mesoporous graphitic carbon nitride (g-C3N4) with open channels and high electron transport properties is in the limelight to serve as a catalyst support for environmental and energy applications. Herein, we have developed novel and environmentally friendly Fe/Ni@g-C3N4 nanocomposites for dual application in hydrodechlorination of trichloroethylene (TCE) and the consecutive oxygen reduction reaction (ORR). A homogeneous distribution of 2–3 nm Ni nanoparticles aligned onto the Fe0 nanoparticles is observed to form bimetallic Fe/Ni nanocomposites. The decoration of Fe/Ni onto a few layers of lamellar g-C3N4 provides large surface area and accelerated electron transfer properties, resulting in the enhanced hydrodechlorination efficiency and rate of TCE. An 8-fold increase in the rate constant for TCE dechlorination by Fe/Ni@g-C3N4 is observed when the external voltage of −0.4 V is applied. Moreover, the generated iron oxides on the surface of Fe/Ni@g-C3N4 after the dechlorination exhibit superior electrocatalytic ORR activity with an electron transfer number of 3.9. In addition, the current density and onset potential of Fe/Ni@g-C3N4 are 3.6 mA cm−2 and 0.84 V, respectively, which are close to those of standard Pt/C electrode materials. Results obtained in this work clearly demonstrate the excellence of Ni/Fe@g-C3N4 nanocomposites in consecutive applications to dechlorination and the ORR, which can open an avenue to design multifunctional metal@carbon nanocomposites as excellent electrochemical activity materials for water-energy nexus applications.

中文翻译:

功能化的Fe / Ni @ g-C3N4纳米结构,可增强三氯乙烯的脱氯作用和连续的氧还原反应活性

具有开放通道和高电子传输性能的中孔石墨碳氮化物(gC 3 N 4)成为人们关注的环境和能源应用的催化剂载体。在这里,我们已经开发出新颖且环保的Fe / Ni @ gC 3 N 4纳米复合材料,可用于三氯乙烯的加氢脱氯(TCE)和连续的氧还原反应(ORR)。观察到在Fe 0纳米颗粒上排列的2–3 nm Ni纳米颗粒的均匀分布,形成了双金属Fe / Ni纳米复合材料。Fe / Ni在几层片状gC 3 N 4上的装饰具有较大的表面积和加速的电子转移性能,从而提高了加氢脱氯效率和三氯乙烯的转化率。当施加-0.4 V的外部电压时,观察到Fe / Ni @ gC 3 N 4对TCE脱氯的速率常数增加了8倍。而且,脱氯后在Fe / Ni @ gC 3 N 4表面上生成的氧化铁表现出优异的电催化ORR活性,电子转移数为3.9。此外,Fe / Ni @ gC 3 N 4的电流密度和起始电位为3.6 mA cm -2和0.84 V,分别接近标准Pt / C电极材料。这项工作获得的结果清楚地证明了Ni / Fe @ gC 3 N 4纳米复合材料在连续用于脱氯和ORR中的卓越表现,这可以为设计多功能金属@碳纳米复合材料作为水能联系的优良电化学活性材料开辟一条道路。应用程序。
更新日期:2020-11-03
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