Journal
CHEMPLUSCHEM
Volume 86, Issue 1, Pages 166-170Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cplu.202000702
Keywords
ammonia synthesis; electrocatalysis; MXenes; nitrogen reduction reaction; nanostructures
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Funding
- National Natural Science Foundation of China [21902021, 21908017, 51972293, 51772039]
- Joint Research Fund Liaoning-Shenyang National Laboratory for Materials Science [20180510020]
- Fundamental Research Funds for the Central Universities [DUT18LK15, DUT18LK21, DUT20RC(4)020, DUT20RC(4)018]
- Supercomputing Center of Dalian University of Technology
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In this study, a Cu/Ti3C2 composite catalyst was prepared for efficient electrochemical conversion of N2 into NH3. This catalyst exhibited high Faradaic efficiency and NH3 production rate in 0.1 M KOH solution. Moreover, it showed superior electrochemical stability and durability, with Cu playing a vital role in enhancing the catalytic activity and conductivity of Ti3C2-based materials.
As an energy-saving and environmentally friendly ammonia synthesis method, electrocatalytic nitrogen reduction reaction (NRR) has received a great deal of attention. There is thus an urgent need to find high-efficiency electrocatalysts for the NRR. In this work, a Cu/Ti3C2 composite catalyst was prepared and demonstrated excellent selectivity under environmental conditions, which could efficiently convert N-2 into NH3 electrochemically. In 0.1 M KOH, Cu/Ti3C2 can achieve a high Faradaic efficiency of 7.31 % and a high NH3 production rate of 3.04 mu mol h(-1) cm(-2) at -0.5 V vs. RHE. Moreover, the material also exhibits superior electrochemical stability and durability. At the same time, density functional theory (DFT) shows that, compared with Ti3C2, Cu/Ti3C2 exhibits a wider conduction and valence band and a larger Fermi level, thus indicating that Cu plays a vital role in the enhancement of the catalytic activity and conductivity of Ti3C2-based materials. This work provides a feasible strategy for designing high-efficiency MXene-based NRR electrocatalysts.
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