Department of Applied Chemistry, School of Science, Tianjin University of Commerce, Tianjin 300134, PR China.
School of Science, Tianjin University, Tianjin 300072, PR China.
J Colloid Interface Sci. 2018 Jun 1;519:194-202. doi: 10.1016/j.jcis.2017.10.054. Epub 2017 Nov 2.
A facile one-pot method for the formation of MoO/RGO has been established using Mo particles as both the reductant for graphene oxide (GO) and as the Mo source. The Mo powder efficiently reduced the GO under acidic conditions to give reduced GO (RGO) and Mo ions. These ions were then transformed into MoO and MoO/RGO composites were formed by tuning the pH of the solution. Other variables such as reaction time and Mo:GO weight ratio were also investigated. The MoO/RGO composite prepared at 3:1 (Mo:GO, called MoO/RGO) had the best electrochemical performance for the oxygen reduction reaction (ORR) in alkaline medium. The ORR reaction at the MoO/RGO electrode mainly proceeded via a four-electron pathway and the electrode displayed superior catalytic activity and good stability. These results indicate that MoO/RGO could be a promising noble metal-free electrocatalyst for fuel cells.
采用 Mo 颗粒作为氧化石墨烯（GO）的还原剂和 Mo 源，建立了 MoO/RGO 的简便一锅法合成方法。在酸性条件下，Mo 粉末将 GO 高效还原为还原氧化石墨烯（RGO）和 Mo 离子。然后通过调节溶液的 pH 值将这些离子转化为 MoO，形成 MoO/RGO 复合材料。还研究了其他变量，如反应时间和 Mo:GO 重量比。在 3:1（Mo:GO，称为 MoO/RGO）下制备的 MoO/RGO 复合材料在碱性介质中对氧还原反应（ORR）具有最佳的电化学性能。MoO/RGO 电极上的 ORR 反应主要通过四电子途径进行，该电极表现出优异的催化活性和良好的稳定性。这些结果表明，MoO/RGO 可能是一种有前途的无贵金属燃料电池电催化剂。
