Enhanced Oxygen Evolution Reaction Activity by Encapsulating NiFe Alloy Nanoparticles in Nitrogen-Doped Carbon Nanofibers.
Peng WeiXueping SunQirui LiangXiaogang LiZhimin HeXiangsheng HuJinxu ZhangMinhui WangQing LiHui YangJiantao HanYangyang HuangPublished in: ACS applied materials & interfaces (2020)
The rational design and exploration of the oxygen evolution reaction (OER) electrocatalysts with high efficiency, low cost, and long-term durability are extremely important for overall water splitting. Recently, numerous studies have shown that the OER reaction kinetics can be modified by optimizing components, introducing carbon matrix, and regulating porous nanostructures. Herein, a flexible and controllable electrospinning strategy is proposed to construct porous nitrogen (N)-doped carbon (C) nanofibers (NFs) with nickel-iron (NiFe) alloy nanoparticles encapsulated inside (NiFe@NCNFs) as an OER electrocatalyst. Benefiting from the strong synergistic effects that stem from the one-dimensional mesoporous structures with optimized binary metal components encapsulated in the N-doped carbon nanofibers, the NiFe@NCNFs exhibits enhanced OER performance with a low overpotential (294 mV at 10 mA cm-2) and excellent durability (over 10 h at 10 mA cm-2) in alkaline solution. Both experimental characterizations and density functional theory (DFT) calculations validate that a suitable binary metal ratio can lead to the optimal catalytic activity. Moreover, a two-electrode electrolyzer is assembled by using NiFe@NCNFs anode and Pt/C cathode in 1.0 M KOH media for the overall water splitting, which delivers an initial cell voltage of only 1.531 V at 10 mA cm-2, as well as long-term stability up to 20 h. This study sheds light on the design and large-scale production of low-cost and high-performance electrocatalysts toward different energy applications in the future.
Keyphrases
- low cost
- density functional theory
- metal organic framework
- high efficiency
- molecular dynamics
- highly efficient
- quantum dots
- reduced graphene oxide
- single cell
- ionic liquid
- stem cells
- tissue engineering
- high resolution
- ion batteries
- electron transfer
- molecular dynamics simulations
- gold nanoparticles
- mass spectrometry
- cancer therapy
- cell therapy
- mesenchymal stem cells
- bone marrow
- iron deficiency