Journal
MATERIALS TODAY
Volume 38, Issue -, Pages 99-113Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.mattod.2020.03.022
Keywords
Two-dimensional; Metallic nanocrystals; Renewable energy; Electrocatalysis
Categories
Funding
- Natural Scientific Foundation of China [21804074, 21890742, 21727815]
- Natural Scientific Foundation of Shandong Province [ZR2018BB051]
- Open Funds of the State Key Laboratory of Electroanalytical Chemistry [SKLEAC201905]
- University of California, Los Angeles
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Ammonia (NH3) is mainly produced through the traditional Haber-Bosch process under harsh conditions with huge energy consumption and massive carbon dioxide (CO2) emission. The nitrogen electroreduction reaction (NERR), as an energy-efficient and environment-friendly process of converting nitrogen (N-2) to NH3 under ambient conditions, has been regarded as a promising alternative to the Haber-Bosch process and has received enormous interest in recent years. Although some exciting progress has been made, considerable scientific and technical challenges still exist in improving the NH3 yield rate and Faradic efficiency, understanding the mechanism of the reaction and promoting the wide commercialization of NERR. Single-atom catalysts (SACS) have emerged as promising catalysts because of their atomically dispersed activity sites and maximized atom efficiency, unsaturated coordination environment, and unique electronic structure, which could significantly improve the rate of reaction and yield rate of NH3. In this review, we briefly introduce the unique structural and electronic features of SACS, which contributes to comprehensively understand the reaction mechanism owing to their structural simplicity and diversity, and in turn, expedite the rational design of fantastic catalysts at the atomic scale. Then, we summarize the most recent experimental and computational efforts on developing novel SACS with excellent NERR performance, including precious metal-, nonprecious metal- and nonmetal-based SACS. Finally, we present challenges and perspectives of SACS on NERR, as well as some potential means for advanced NERR catalyst.
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