In-situ One-Step Preparation of Nickel-Tipped N-doped Carbon Nanotubes for Oxygen Reduction
In-situ One-Step Preparation of Nickel-Tipped N-doped Carbon Nanotubes for Oxygen Reduction
复制标题
原位一步制备镍端氮掺杂碳纳米管用于氧还原
DOI：
10.1002/cctc.201901239
复制
发表时间：
2019-09-18
期刊：
影响因子：
4.5
通讯作者：
Zhao, Zhenlu
中科院分区：
文献类型：
--
作者：
Huai, Jie;Ma, Kongshuo;Zhao, Zhenlu
在这里，我们通过三聚氰胺和泡沫镍在520℃、540℃和700℃的Ar气氛中直接程序焙烧，成功地在顶部嵌入了镍基纳米颗粒的N掺杂碳纳米管(N-CNTs/E-NNPs)。在0.1M氢氧化钾溶液中，氧还原反应(ORR)的起始电位和半波电位分别为0.96V和0.86V，与商用的10wt%PtC相当，并且具有更高的稳定性和更好的耐甲醇能力。此外，N-CNTs/E-NNPs在0.1M KOH中的Tafel斜率为76 mV dec(-1)，低于商业10wt%铂/C的83 mV dec(-1)，表现出良好的动力学过程。这些显著的特征主要归因于富N掺杂的碳纳米管(N-CNTs)和顶部嵌入的镍基纳米粒子的协同增强效应，促进了质量和电子的传输，增强了活性中心的活性，使其成为一种有前途的高效非贵金属ORR催化剂。
Here, we successfully synthesized N-doped carbon nanotubes embedded with nickel-based nanoparticles on the top (N-CNTs/E-NNPs) by directly procedural calcination of melamine and nickel foam at 520 degrees C, 540 degrees C and 700 degrees C in Ar. When applied for oxygen reduction reaction (ORR), the onset potential and half-wave potential are 0.96 V and 0.86 V in 0.1 M KOH, comparable to that of the commercial 10 wt% Pt/C. Moreover, the hybrids possess higher stability and better methanol tolerance. Additionally, the Tafel slope of N-CNTs/E-NNPs is 76 mV dec(-1) in 0.1 M KOH, lower than 83 mV dec(-1) of the commercial 10 wt% Pt/C, demonstrating a good kinetic process. The remarkable features are mainly ascribed to synergistic enhancement effect from N-rich doped carbon nanotubes (N-CNTs) and embedded Ni-based nanoparticles on the top, promoting mass and electrons transport, enhancing the activity of active sites and making it a promising highly efficient non-precious metal ORR catalyst.