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Bimetallic PdCu Nanocrystals Immobilized by Nitrogen-Containing Ordered Mesoporous Carbon for Electrocatalytic Denitrification
- Xu, Huawei, Xu, Hui, Chen, Zehan, Ran, Xianqiang, Fan, Jianwei, Luo, Wei, Bian, Zhenfeng, Zhang, Wei-xian, Yang, Jianping
- ACS applied materials & interfaces 2019 v.11 no.4 pp. 3861-3868
- carbon, catalysts, denitrification, dicyandiamide, electrolytes, nanocrystals, nitrates, nitrogen, porous media
- Issues of uniform incorporation of catalytic functional species with controllable sizes, shapes, compositions, and functions into porous carbon scaffolds remain significant challenges toward enriching and boosting performance. Here, we develop a straightforward approach that introduces dicyandiamide as a nitrogen source to chelate with metal species and combines with the surfactant-templating self-assembly method for the fabrication of highly dispersed catalysts anchored in nitrogen-containing ordered mesoporous carbon (NOMC). As a result, these functional catalyst (such as PdCu nanocrystals)-embedded NOMC composites manifest a synergistic catalytic capability for the electroreduction of nitrate in neutral electrolyte, with more than 90% nitrate removed under an ultra-low concentration of 100 ppm and a high nitrogen selectivity of 60% after 10 repeated tests.