Shanxi Key Laboratory of Gas Energy Efficient and Clean Utilization, Research Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan, Shanxi 030024, PR China.
Nanoscale. 2018 Feb 22;10(8):3997-4003. doi: 10.1039/c7nr09446a.
The rational modulation of composition and structure is critical for the development of robust and efficient oxygen evolution reaction (OER) catalysts for water splitting. In this study, an onion-like N-doped carbon nanorods hybrid (denoted as ONC) with encapsulated Ni/FeO heterostructures has been fabricated by the pyrolysis of an NiFe-based coordination polymer under a N atmosphere. The nanorod-like morphology is transferred from the polymer to the hybrids and generates ONC nanolayers encapsulated with core-shell Ni/FeO nanostructures. The synergistic effects between the ONC layers and the encapsulated Ni/FeO heterostructures result in high electronic conductivity due to the nitrogen-doped carbon with an appropriate level of defects and enlarged electrochemical surface area due to the well-defined mesoporous morphology. Compared with Ni@ONC, FeO@ONC, NiFeO and commercial RuO electrocatalysts, the as-prepared Ni/FeO@ONC exhibits extraordinary electrocatalytic activity for water oxidation with an overpotential of merely 296 mV at 10 mA cm and a small Tafel slope of 61 mV dec. This Ni/FeO@ONC OER catalyst highlights the great potential of integrating hetero-composite nanocatalysts with hetero-atom doped nanocarbon supports for the development of high-performance electrocatalysts for renewable energy applications.
合理调控组成和结构对于开发用于水分解的稳健且高效的氧析出反应（OER）催化剂至关重要。在这项研究中，通过在氮气气氛下对 NiFe 基配位聚合物进行热解，制备了具有封装的 Ni/FeO 异质结构的洋葱状 N 掺杂碳纳米棒杂化物（表示为 ONC）。棒状形态从聚合物转移到杂化物上，并生成了具有核壳结构的 Ni/FeO 纳米结构的 ONC 纳米层。由于具有适当缺陷水平的氮掺杂碳和由于明确的介孔形态而增大的电化学表面积，ONC 层和封装的 Ni/FeO 异质结构之间的协同效应导致了高电子导电性。与 Ni@ONC、FeO@ONC、NiFeO 和商业 RuO 电催化剂相比，所制备的 Ni/FeO@ONC 对水氧化具有非凡的电催化活性，仅需 296 mV 的过电势即可达到 10 mA cm 的电流密度，并且 Tafel 斜率很小，为 61 mV dec。这种 Ni/FeO@ONC OER 催化剂突出了将异质复合纳米催化剂与杂原子掺杂纳米碳载体集成的巨大潜力，可用于开发用于可再生能源应用的高性能电催化剂。
