State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, People's Republic of China. University of Science and Technology of China, Hefei 230026, People's Republic of China.
Nanotechnology. 2020 Mar 20;31(12):125404. doi: 10.1088/1361-6528/ab5b56. Epub 2019 Nov 25.
Herein, we design a dual-template-assisted pyrolysis method to prepare ultra-small FeO nanoparticles anchored on Fe/N-doped hollow porous carbon spheres (0.010-Fe/NHPCS-800) for oxygen reduction reaction (ORR). The synthesized SiO nanospheres, which are selected as the hard template, contribute to forming macroporous structure. Pluronic ® F127 is employed to fabricate mesopores through high-temperature pyrolysis as a soft template. In this way, the 0.010-Fe/NHPCS-800 architecture represents an ordered hierarchically porous property with a large BET surface area (1812 m g), which can facilitate the mass transport of reactants and increase the electrochemically active area. The FeO nanoparticles wrapped by graphitic carbon layers provide more active sites, and the synergistic interaction between FeO nanoparticles and doping N has a positive effect on ORR performance. The 0.010-Fe/NHPCS-800 catalyst outperforms the most effective ORR activities among a series of Fe/NHPCS samples with onset potential of 0.95 V (versus reversible hydrogen potential) and half-wave potential of 0.81 V, which is almost the same as the commercial Pt/C (0.96 and 0.81 V, correspondingly) in 0.10 M KOH. However, both the stability and durability of 0.010-Fe/NHPCS-800 surpass those of commercial Pt/C. Given all these advantages, 0.010-Fe/NHPCS-800 is a promising candidate to take the place of Pt-based electrocatalysts for ORR in the future.
在此，我们设计了一种双模板辅助热解法，制备了负载在 Fe/N 掺杂空心多孔碳球（0.010-Fe/NHPCS-800）上的超小 FeO 纳米颗粒，用于氧还原反应（ORR）。所合成的 SiO2 纳米球被选为硬模板，有助于形成大孔结构。Pluronic® F127 被用作软模板，通过高温热解来制备介孔。通过这种方式，0.010-Fe/NHPCS-800 结构具有有序的分级多孔特性，比表面积大（1812 m²/g），有利于反应物的质量传输并增加电化学活性面积。由石墨碳层包裹的 FeO 纳米颗粒提供了更多的活性位点，FeO 纳米颗粒与掺杂 N 之间的协同相互作用对 ORR 性能有积极影响。与一系列 Fe/NHPCS 样品相比，0.010-Fe/NHPCS-800 催化剂具有更高的 ORR 活性，起始电位为 0.95 V（相对于可逆氢电位），半波电位为 0.81 V，几乎与商业 Pt/C（分别为 0.96 和 0.81 V）相当，在 0.10 M KOH 中。然而，0.010-Fe/NHPCS-800 的稳定性和耐久性都超过了商业 Pt/C。鉴于所有这些优势，0.010-Fe/NHPCS-800 是一种很有前途的候选材料，可以替代 Pt 基电催化剂，用于未来的 ORR。
