材料科学
过电位
塔菲尔方程
碳化
生物高聚物
电催化剂
化学工程
电化学
纳米技术
聚合
碳纤维
兴奋剂
生物相容性
聚合物
化学
复合数
复合材料
电极
冶金
扫描电子显微镜
物理化学
工程类
光电子学
作者
Duong Nguyen Nguyen,Uk Sim,Jung Kyu Kim
出处
期刊:Polymers
[MDPI AG]
日期:2020-04-15
卷期号:12 (4): 912-912
被引量:17
标识
DOI:10.3390/polym12040912
摘要
Hydrogen-evolution reaction (HER) is a promising technology for renewable energy conversion and storage. Electrochemical HER can provide a cost-effective method for the clean production of hydrogen. In this study, a biomimetic eco-friendly approach to fabricate nitrogen-doped carbon nanosheets, exhibiting a high HER performance, and using a carbonized polydopamine (C-PDA), is described. As a biopolymer, polydopamine (PDA) exhibits high biocompatibility and can be easily obtained by an environmentally benign green synthesis with dopamine. Inspired by the polymerization of dopamine, we have devised the facile synthesis of nitrogen-doped nanocarbons using a carbonized polydopamine for the HER in acidic media. The N-doped nanocarbons exhibit excellent performance for H2 generation. The required overpotential at 5 mA/cm2 is 130 mV, and the Tafel slope is 45 mV/decade. Experimental characterizations confirm that the excellent performance of the N-doped nanocarbons can be attributed to the multisite nitrogen doping, while theoretical computations indicate the promotion effect of tertiary/aromatic nitrogen doping in enhancing the spin density of the doped samples and consequently in forming highly electroactive sites for HER applications.
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