Ko Tae-Hoon, Devarayan Kesavan, Seo Min-Kang, Kim Hak-Yong, Kim Byoung-Suhk
Department of Organic Materials &Fiber Engineering, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea.
Department of BIN Convergence Technology, Chonbuk National University, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea.
Sci Rep. 2016 Feb 1;6:20313. doi: 10.1038/srep20313.
The design and development of an economic and highly active non-precious electrocatalyst for methanol electrooxidation is challenging due to expensiveness of the precursors as well as processes and non-ecofriendliness. In this study, a facile preparation of core-shell-like NiCo2O4 decorated MWCNTs based on a dry synthesis technique was proposed. The synthesized NiCo2O4/MWCNTs were characterized by infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and selected area energy dispersive spectrum. The bimetal oxide nanoparticles with an average size of 6 ± 2 nm were homogeneously distributed onto the surface of the MWCNTs to form a core-shell-like nanostructure. The NiCo2O4/MWCNTs exhibited excellent electrocatalytic activity for the oxidation of methanol in an alkaline solution. The NiCo2O4/MWCNTs exhibited remarkably higher current density of 327 mA/cm(2) and a lower onset potential of 0.128 V in 1.0 M KOH with as high as 5.0 M methanol. The impressive electrocatalytic activity of the NiCo2O4/MWCNTs is promising for development of direct methanol fuel cell based on non-Pt catalysts.
设计和开发一种用于甲醇电氧化的经济且高活性的非贵金属电催化剂具有挑战性，这是由于前驱体以及制备过程成本高昂且不环保。在本研究中，提出了一种基于干合成技术简便制备核壳状NiCo₂O₄修饰多壁碳纳米管的方法。通过红外光谱、扫描电子显微镜、透射电子显微镜、X射线衍射和选区能量色散谱对合成的NiCo₂O₄/多壁碳纳米管进行了表征。平均尺寸为6±2nm的双金属氧化物纳米颗粒均匀分布在多壁碳纳米管表面，形成核壳状纳米结构。NiCo₂O₄/多壁碳纳米管在碱性溶液中对甲醇氧化表现出优异的电催化活性。在含有高达5.0M甲醇的1.0M KOH中，NiCo₂O₄/多壁碳纳米管表现出显著更高的电流密度327mA/cm²和更低的起始电位0.128V。NiCo₂O₄/多壁碳纳米管令人印象深刻的电催化活性对于基于非铂催化剂的直接甲醇燃料电池的开发具有前景。
