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Exploring the effect of Ni/Cr contents on the sheet-like nicr-oxide-decorated CNT composites as highly active and stable catalysts for urea electrooxidation

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Clean Energy 2020年第1期4卷 58-66页

作者： Qiuping Gan Benzhi Wang Judan Chen Jianniao Tian Tayirjan Taylor Isimjan Xiulin Yang Guangxi Key Laboratory of Low Carbon Energy Materials School of Chemistry and Pharmaceutical SciencesGuangxi Normal UniversityGuilin 541004People’s Republic of China Saudi Arabia Basic Industries Corporation(SABIC)at King Abdullah University of Science and Technology(KAUST) Thuwal 23955-6900Saudi Arabia

The developing high-efficiency urea fuel cells have an irreplaceable role in solving the increasingly severe environmental crisis and energy *** sluggish six-electron dynamic anodic oxidation reaction is the bottleneck of the rapid progress of urea fuel-cell *** tackle this challenge,we select the nicr bimetallic system due to the unique synergic effect between the Ni and the ***,better conductivity is assured using carbon nanotubes(CNTs)as the *** importantly,we use a simple hydrothermal method in catalyst preparation for easy scale-up at a low *** results show that the hybrid catalysts of nicr_(x)-oxide-CNTs with different Ni/Cr ratios show much better catalytic performance in terms of active surface area and current density as compared to that of *** optimized nicr_(2)-oxide-CNTs catalyst exhibits not only the largest electrochemically active surface area(ESA,50.7 m^(2) g^(−1))and the highest urea electrocatalytic current density(115.6 mA cm^(−2)),but also outstanding long-term *** prominent performance of the nicr_(2)-oxide-CNTs catalyst is due to the combined effect of the improved charge transfer between Ni and Cr species,the large ESA,along with an elegant balance between the oxygen-defect sites and ***,we have proposed a synergistically enhanced urea catalytic mechanism.

关键词： nicr-oxide coupling effect urea electrooxidation electrocatalysis fuel cells

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