首页> 外文期刊>Advanced energy materials >High-Performance Hydrogen Evolution by Ru Single Atoms and Nitrided-Ru Nanoparticles Implanted on N-Doped Graphitic Sheet
【24h】

High-Performance Hydrogen Evolution by Ru Single Atoms and Nitrided-Ru Nanoparticles Implanted on N-Doped Graphitic Sheet

机译:通过在N掺杂石墨片上注入Ru单原子和氮化Ru纳米粒子实现高性能氢的释放

获取原文
获取原文并翻译 | 示例
           

摘要

The most efficient electrocatalyst for the hydrogen evolution reaction (HER) is a Pt-based catalyst, but its high cost and nonperfect efficiency hinder wide-ranging industrial/technological applications. Here, an electrocatalyst of both ruthenium (Ru) single atoms (SAs) and N-doped-graphitic(G(N))-shell-covered nitrided-Ru nanoparticles (NPs) (having a Ru-N-x shell) embedded on melamine-derived G(N) matrix {1: [Ru(SA)+Ru(NP)@RuNx@G(N)]/G(N)}, which exhibits superior HER activity in both acidic and basic media, is presented. In 0.5 m H2SO4/1 m KOH solutions, 1 shows diminutive "negative overpotentials" (-eta = |eta| = 10/7 mV at 10 mA cm(-2), lowest ever) and high exchange current densities (4.70/1.96 mA cm(-2)). The remarkable HER performance is attributed to the near-zero free energies for hydrogen adsorption/desorption on Ru(SAs) and the increased conductivity of melamine-derived G(N) sheets by the presence of nitrided-Ru(NPs). The nitridation process forming nitrided-Ru(NPs), which are imperfectly covered by a G(N) shell, allows superb long-term operation durability. The catalyst splits water into molecular oxygen and hydrogen at 1.50/1.40 V (in 0.1 m HClO4/1 m KOH), demonstrating its potential as a ready-to-use, highly effective energy device for industrial applications.
机译:氢气析出反应(HER)最有效的电催化剂是基于Pt的催化剂,但是其高成本和不完美的效率阻碍了广泛的工业/技术应用。在此,嵌入三聚氰胺的钌(Ru)单原子(SAs)和N掺杂石墨(G(N))-壳覆盖的氮化Ru纳米颗粒(NPs)(NPs)具有Ru-Nx壳的电催化剂。给出了在酸性和碱性介质中均表现出优异的HER活性的衍生的G(N)矩阵{1:[Ru(SA)+ Ru(NP)@ RuNx @ G(N)] / G(N)}。在0.5 m H2SO4 / 1 m KOH溶液中,1显示出较小的“负超电势”(-eta = | eta | = 10/7 mV,在10 mA cm(-2)时,最低)和高交换电流密度(4.70 /1.96 mA cm(-2))。杰出的HER性能归因于氢在Ru(SAs)上的吸附/解吸的自由能接近于零,并且由于存在氮化的Ru(NPs)而使三聚氰胺衍生的G(N)片的电导率增加。氮化过程形成的氮化Ru(NPs)不完全被G(N)壳覆盖,可以提供极好的长期运行耐久性。该催化剂在1.50 / 1.40 V(在0.1 m HClO4 / 1 m KOH中)将水分解为分子氧和氢,证明了其作为现成的,高效的工业应用能源装置的潜力。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号