Template-Free Preparation of 3D Porous Co-Doped VN Nanosheet-Assembled Microflowers with Enhanced Oxygen Reduction Activity,ACS Applied Materials & Interfaces

当前位置： X-MOL 学术 › ACS Appl. Mater. Interfaces › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Template-Free Preparation of 3D Porous Co-Doped VN Nanosheet-Assembled Microflowers with Enhanced Oxygen Reduction Activity
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2018-03-21 00:00:00 , DOI: 10.1021/acsami.7b18504
Haibo Tang ₁ , Junming Luo ₁ , Xin Long Tian ₁ , Yuanyuan Dong ₁ , Jing Li ₁ , Mingrui Liu ₁ , Lina Liu ₁ , Huiyu Song ₁ , Shijun Liao ₁

Affiliation

Developing cheap and stable electrocatalysts is considered the key factor to achieve the large-scale application of fuel cells. In this paper, three-dimensional (3D) porous Co-doped vanadium nitride (VN) nanosheet-assembled microflowers are prepared with a facile solvothermal approach followed by nitridation at 500 °C in NH₃. It is found that the microflower morphology and the Co doping both significantly enhance the oxygen reduction reaction (ORR) performance of the materials. Because the unique 3D porous structure provides higher specific surface area and more active sites as well as enriching the d electrons of V via doping, Co also improves the intrinsic activity of VN. Our optimal V_0.95Co_0.05N microflowers achieve a half-wave potential for the ORR of up to 0.80 V in 0.1 M KOH solution, which is almost comparable to that of commercial 20% Pt/C. More importantly, the catalysts show superior durability with little current decline (less than 12%) during chronoamperometric evaluation for over 25 000 s. These features make the V_0.95Co_0.05N microflowers attractive for fuel cell applications.

中文翻译：

无模板制备具有增强的氧还原活性的3D多孔共掺杂VN纳米片组装的微花

开发廉价，稳定的电催化剂被认为是实现燃料电池大规模应用的关键因素。在本文中，采用便捷的溶剂热方法制备了3维（3D）多孔共掺杂氮化钒（VN）纳米片组装的微花，然后在NH _3中于500°C进行了氮化。发现微花形态和Co掺杂都显着增强了材料的氧还原反应（ORR）性能。因为独特的3D多孔结构提供了更高的比表面积和更多的活性位点，并且通过掺杂使V的d电子富集，所以Co也可以改善VN的固有活性。我们的最佳V _0.95 Co _0.05在0.1 M KOH溶液中，N朵小花的ORR的半波电势高达0.80 V，几乎与20％Pt / C的商业水平相当。更重要的是，在超过25 000 s的计时电流分析过程中，该催化剂显示出优异的耐久性，几乎没有电流下降（小于12％）。这些特性使V _0.95 Co _0.05 N微型花吸引了燃料电池应用。

更新日期：2018-03-21

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南