Thanh Tran Duy, Chuong Nguyen Dinh, Balamurugan Jayaraman, Van Hien Hoa, Kim Nam Hoon, Lee Joong Hee
Advanced Materials Institute of BIN Convergence (BK21 plus Global), Department of BIN Convergence Technology, Chonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea.
Center for Carbon Composite Materials, Department of Polymer & Nano Science and Technology, Chonbuk National University, Jeonju, Jeonbuk, 54896, Republic of Korea.
Small. 2017 Oct;13(39). doi: 10.1002/smll.201701884. Epub 2017 Aug 22.
A nanohybrid based on porous and hollow interior structured LaNiO stabilized nitrogen and sulfur codoped graphene (LaNiO /N,S-Gr) is successfully synthesized for the first time. Such a nanohybrid as an electrocatalyst shows high catalytic activity for oxygen reduction reaction (ORR) in O -saturated 0.1 m KOH media. In addition, it demonstrates a comparable catalytic activity, longer working stability, and much better alcohol tolerance compared with commercial Pt/C behavior in same experiment condition. The obtained results are attributed to synergistic effects from the enhanced electrocatalytic active sites on the rich pore channels of porous hollow-structured LaNiO spheres and heteroatom doped efficiency on graphene structure. In addition, N,S-Gr can meritoriously stabilize monodispersion of the LaNiO spheres, and act as medium bridging for high electrical conductivity, thereby providing large active surface area for O adsorption, accelerating reduction reaction, and improving electrochemical stability. Such a hybrid opens an interesting class of highly efficient non-Pt catalysts for ORR in alkaline media.
首次成功合成了一种基于多孔空心内部结构的LaNiO稳定的氮硫共掺杂石墨烯（LaNiO /N,S-Gr）的纳米杂化物。这种纳米杂化物作为一种电催化剂，在O2饱和的0.1 m KOH介质中对氧还原反应（ORR）表现出高催化活性。此外，与相同实验条件下的商业Pt/C相比，它表现出相当的催化活性、更长的工作稳定性和更好的耐醇性。所得结果归因于多孔空心结构的LaNiO球体丰富孔道上增强的电催化活性位点与石墨烯结构上杂原子掺杂效率的协同效应。此外，N,S-Gr可以出色地稳定LaNiO球体的单分散性，并作为高电导率的介质桥接，从而为O2吸附提供大的活性表面积，加速还原反应并提高电化学稳定性。这种杂化物为碱性介质中的ORR开辟了一类有趣的高效非Pt催化剂。
