Unique hollow Ni-Fe@MoS2 nanocubes with boosted electrocatalytic activity for N-2 reduction to NH3
发布时间：2020-05-10
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- 论文类型：
- 期刊论文
- 发表时间：
- 2020-04-21
- 发表刊物：
- JOURNAL OF MATERIALS CHEMISTRY A
- 收录刊物：
- SCIE
- 文献类型：
- J
- 卷号：
- 8
- 期号：
- 15
- 页面范围：
- 7339-7349
- ISSN号：
- 2050-7488
- 摘要：
- Nanostructure tailoring is considered as an efficient strategy to design high-performance electrocatalysts for improving electrocatalytic properties by exposing more active sites and promoting rapid electron transfer. Unfortunately, nanomaterials with a well-constructed morphology for the nitrogen reduction reaction (NRR) under ambient conditions are insufficient, and the yield rate and faradaic efficiency are still not high. Herein, NiFe-MoS2 nanocubes (NiFe@MoS2 NCs) are successfully synthesized derived from the corresponding Prussian blue analog self-templating strategy. Owing to its four-pointed star face-dependent hollow structure and trimetallic synergistic interactions, it largely exposes abundant active sites, making it present superb electrocatalytic performance for N-2 conversion to NH3. In a 0.1 M Na2SO4 electrolyte, these as-prepared Ni-Fe@MoS2 NCs exhibit a significant NH3 yield of 128.17 mu g h(-1) mg(cat.)(-1) and a satisfactory faradaic efficiency of 11.34% at -0.3 V vs. reversible hydrogen electrode (RHE) operation at 40 degrees C. The stability of the catalyst was determined by performing 15 hour continuous N-2 reduction with a constant current density. The possible NRR catalytic paths, mechanism and electron transfer paths are elucidated in detail by in situ electrochemical-Fourier transform infrared spectroscopy combined with density functional theory calculations. This work offers new inspirations to the development of various cost-effective electrocatalysts for N-2 fixation.
- 第一作者
- Zeng, Libin
- 合写作者
- Chen, Shuai,Wen, Jiali,Huang, Wei,Chen, Aicheng,Li, Xinyong
- 通讯作者
- Chen, AC (reprint author), Univ Guelph, Dept Chem, Electrochem Technol Ctr, 50 Stone Rd East, Guelph, ON N1G 2W1, Canada.