近期，我院研究生杨明，教师王雨鑫（通讯）、张刘挺（通讯）等的研究成果“Dual-regulation strategy for enhanced hydrogen storage in MgH2: Nitrogen doping and molar ratio tuning in bimetallic catalysts”在《Chinese Chemical Letters》(一区TOP，IF=8.9)上发表。
论文简介如下：
Bimetallic catalysts exhibit superior catalytic performance and enhanced stability through synergistic effects unattainable by monometallic systems, making them highly promising for energy-related catalysis. A dual modulation strategy involving nitrogen doping and catalytic regulation by varying the Fe/Ni molar ratios was realized through the synthesis of NiFeO@N/rGO composites. Nitrogen doping facilitates the formation of oxygen vacancies, which significantly reduces electrical resistance and enhances surface catalytic activity. Concurrently, the synergistic catalysis between the two metals promotes electron transfer and provides pathways for hydrogen diffusion. At 265°C, the MgH2 + 10 wt% NiFeO@N/rGO composite released 6.65 wt% H2 within 10 min, reducing dehydrogenation activation energy from 158.8 kJ/mol to 70.4 kJ/mol. Moreover, it achieved 5.05 wt% H2 uptake within 10 min at 150°C, demonstrating superior hydrogen absorption kinetics. Cycling stability tests showed a 95% capacity retention rate and a reversible hydrogen capacity of 6.51 wt% after 20 cycles. DFT theoretical calculations reveal that NiFeO enhances catalytic activity through electronic structure modulation and synergistic electron transfer between Fe and Ni. In summary, the high catalytic efficiency arises from the combined effects of multiple factors: the hydrogen pump effect, bimetallic synergy, uniform dispersion of NiFeO nanoparticles facilitated by rGO, as well as the collective contributions of N-doping-induced oxygen vacancies and improved electron transfer. The dual-regulation strategy involving nitrogen doping and tunable elemental molar ratios provides novel insights for developing high-performance hydrogen storage materials.
链接：https://www.sciencedirect.com/science/article/abs/pii/S1001841726001919
