文章基本信息

标题：Metal–organic framework–derived Ni@C and NiO@C as anode catalysts for urea fuel cells
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作者：Thao Quynh Ngan Tran ; Bang Ju Park ; Woo Hyun Yun 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2020
卷号：10
期号：1
页码：1-10
DOI：10.1038/s41598-019-57139-7
出版社：Springer Nature
摘要：Highly porous self-assembled nanostructured Ni@C and NiO@C were synthesized via calcination of a Ni-based metal-organic framework. The morphology, structure, and composition of as synthesized Ni@C and NiO@C were characterized by SEM, FIB-SEM, TEM, and XRD. The electro-catalytic activity of the Ni@C and NiO@C catalysts towards urea oxidation was investigated using cyclic voltammetry. It was found that the Ni@C had a higher residual carbon content and a higher specific surface area than NiO@C, thus exhibiting an enhanced electrochemical performance for urea oxidation. A direct urea fuel cell with Ni@C as an anode catalyst featured an excellent maximum power density of 13.8 mW cm -2 with 0.33 M urea solution in 1 M KOH as fuel and humidified air as oxidant at 50 °C, additionally showing excellent stability during continuous 20-h operation. Thus, this work showed that the highly porous carbon-supported Ni catalysts derived from Ni-based metal-organic framework can be used for urea oxidation and as an efficient anode material for urea fuel cells.