Porous VO(x)N(y) nanoribbons supported on CNTs as efficient and stable non-noble electrocatalysts for the oxygen reduction reaction.
Porous VO(x)N(y) nanoribbons supported on CNTs as efficient and stable non-noble electrocatalysts for the oxygen reduction reaction.
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CNT 负载的多孔 VOxNy 纳米带作为氧还原反应的高效稳定的非贵金属电催化剂
DOI：
10.1038/srep17385
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发表时间：
2015-11-30
影响因子：
4.6
通讯作者：
Lei M
中科院分区：
文献类型：
--
作者：
Huang K;Bi K;Lu YK;Zhang R;Liu J;Wang WJ;Tang HL;Wang YG;Lei M
通过将碳纳米管（CNTs）和V2 O 5的溶胶-凝胶混合物在NH3气氛下退火以及在空气中老化，制备了新型碳纳米管负载多孔VOxNy纳米带（VOxNy-CNTs）复合材料。除了通过TEM、SEAD、EDS、XRD和XPS等手段对VOxNy-CNTs的形貌和结构进行表征外，还采用循环伏安法（CV）、旋转圆盘电极（RDE）和计时电流法等电化学测试手段对VOxNy-CNTs的氧还原反应（ORR）性能进行了研究。结果表明，与市售Pt/C催化剂相比，VOxNy-CNTs催化剂的扩散极限电流密度提高了0.4mA/cm 2，起始电位降低了0.10V，ORR电流衰减降低了10.73%，并具有优异的耐甲醇性能。因此，我们有合理的理由相信，这种新的VOxNy-CNTs纳米复合材料可以被视为一个有前途的非贵重的耐甲醇的ORR催化剂候选人的碱性燃料电池。
Novel nanocomposites of carbon nanotubes supported porous VOxNy nonoribbons (VOxNy-CNTs) have been synthesized by the annealing of the sol-gel mixture of CNTs and V2O5 under NH3 atmosphere as well as the ageing process in air. Besides the morphological and structural characterizations revealed by TEM, SEAD, EDS, XRD and XPS measurements, typical electrochemical tests including cyclic voltammetry (CV), rotating disk electrode (RDE) and chronoamperometry have been employed to determine the oxygen reduction reaction (ORR) performance of VOxNy-CNTs. Inspiringly, the results indicate that VOxNy-CNTs catalyst exhibits a 0.4 mA/cm2 larger diffusion-limited current density, a 0.10 V smaller onset potential value, a 10.73% less of ORR current decay and an excellent methanol-tolerance compared with commercial Pt/C catalyst. Therefore, we have reasonable grounds to believe that this new VOxNy-CNTs nanocomposites can be regarded as a promising non-precious methanol-tolerant ORR catalyst candidate for alkaline fuel cells.