Assembly of hollow mesoporous nanoarchitectures composed of ultrafine Mo2C nanoparticles on N-doped carbon nanosheets for efficient electrocatalytic reduction of oxygen
Assembly of hollow mesoporous nanoarchitectures composed of ultrafine Mo2C nanoparticles on N-doped carbon nanosheets for efficient electrocatalytic reduction of oxygen
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DOI：
10.1039/c7mh00586e
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发表时间：
2017-11-01
影响因子：
13.3
通讯作者：
Yamauchi, Yusuke
中科院分区：
文献类型：
--
作者：
Guo, Yanna;Tang, Jing;Yamauchi, Yusuke
发展了一种简单的方法来组装Mo 2C纳米晶体的中空，高导电性的介孔纳米粒子的表面。以二嵌段共聚物（PS-b-PEO）胶束为模板，使MoO_（42-）和聚多巴胺（PDA）前体快速络合，制备中空的MoO_（42-）/PDA/PS-b-PEO前体粒子。然后将这些颗粒粉碎以生成布满超细碳化钼（Mo 2C）纳米颗粒的介孔N掺杂碳纳米片（MMo 2C/NCS）。N掺杂的碳基质用作电子导体，并有助于防止Mo 2C纳米颗粒的聚集。Mo 2C纳米颗粒反过来增强了氧还原反应（ORR）的催化性能。独特的介孔2D纳米片及其衍生的3D中空结构暴露了许多活性催化位点，同时使电解质自由扩散和传质成为可能。基于这些性质，MMo_2C/NCS显示出增强的ORR催化活性。
A simple method is developed to assemble Mo2C nanocrystals on the surfaces of hollow, highly conductive mesoporous nanoparticles. Diblock copolymer (PS-b-PEO) micelles are used as templates to assist in the fast complexation of molybdate (MoO42-) and poly-dopamine (PDA) precursors to make hollow precursor MoO42-/PDA/PS-b-PEO particles. Then these particles are carbonized to generate mesoporous N-doped carbon nanosheets riddled with ultrafine molybdenum carbide (Mo2C) nanoparticles (MMo2C/NCS). An N-doped carbon matrix serves as an electron conductor and helps to prevent the aggregation of the Mo2C nanoparticles. The Mo2C nanoparticles in turn enhance the catalytic performance for the oxygen reduction reaction (ORR). The unique mesoporous 2D nanosheet and its derived 3D hollow structure expose numerous active catalytic sites while enabling free diffusion of the electrolyte and mass transfer. Based on these properties, MMo2C/NCS show enhanced catalytic activity for the ORR.