为加强综合能源系统(integrated energy system,IES)的设备间配合和能源站的站间配合,实现能源的高效生产与灵活分配,构建了一种集中-分布式能源站结构,并在此基础上提出了考虑多品位能源互补的IES分级规划策略。首先,基于能源站分工的...为加强综合能源系统(integrated energy system,IES)的设备间配合和能源站的站间配合,实现能源的高效生产与灵活分配,构建了一种集中-分布式能源站结构,并在此基础上提出了考虑多品位能源互补的IES分级规划策略。首先,基于能源站分工的思想,建立集中-分布式能源站结构,并在其中引入热电解耦的改进燃气轮机线性化模型;然后,基于集中-分布式能源站结构和能源枢纽(energy hub,EH)理论,建立考虑多品位能源互补的IES能量耦合模型;最后,以最小化系统总体成本为目标函数,建立IES分级规划模型,确定系统中各能源站的设备配置情况与线路规划情况。算例分析表明:所提的集中-分布式能源站结构可以更好地发挥IES多能耦合的优势,由IES分级规划得到的系统拥有更好的经济性与更低的能源传输损耗。展开更多
Alloying transition metals with Pt is an effective strategy for optimizing Pt-based catalysts toward the oxygen reduction reaction(ORR).Atomic ordered intermetallic compounds(IMC)provide unique electronic and geometri...Alloying transition metals with Pt is an effective strategy for optimizing Pt-based catalysts toward the oxygen reduction reaction(ORR).Atomic ordered intermetallic compounds(IMC)provide unique electronic and geometrical effects as well as stronger intermetallic interactions due to the ordered arrangement of metal atoms,thus exhibiting superior electrocata-lytic activity and durability.However,quantitatively analyzing the ordering degree of IMC and exploring the correlation between the ordering degree and ORR activity remains extremely challenging.Herein,a series of ternary Pt_(2)NiCo interme-tallic catalysts(o-Pt_(2)NiCo)with different ordering degree were synthesized by annealing temperature modulation.Among them,the o-Pt_(2)NiCo which annealed at 800℃for two hours exhibits the highest ordering degree and the optimal ORR ac-tivity,which the mass activity of o-Pt_(2)NiCo is 1.8 times and 2.8 times higher than that of disordered Pt_(2)NiCo alloy and Pt/C.Furthermore,the o-Pt_(2)NiCo still maintains 70.8%mass activity after 30,000 potential cycles.Additionally,the ORR activity test results for Pt_(2)NiCo IMC with different ordering degree also provide a positive correlation between the ordering degree and ORR activity.This work provides a prospective design direction for ternary Pt-based electrocatalysts.展开更多
文摘为加强综合能源系统(integrated energy system,IES)的设备间配合和能源站的站间配合,实现能源的高效生产与灵活分配,构建了一种集中-分布式能源站结构,并在此基础上提出了考虑多品位能源互补的IES分级规划策略。首先,基于能源站分工的思想,建立集中-分布式能源站结构,并在其中引入热电解耦的改进燃气轮机线性化模型;然后,基于集中-分布式能源站结构和能源枢纽(energy hub,EH)理论,建立考虑多品位能源互补的IES能量耦合模型;最后,以最小化系统总体成本为目标函数,建立IES分级规划模型,确定系统中各能源站的设备配置情况与线路规划情况。算例分析表明:所提的集中-分布式能源站结构可以更好地发挥IES多能耦合的优势,由IES分级规划得到的系统拥有更好的经济性与更低的能源传输损耗。
基金supported by the National Natural Science Foundation(22279036)the Innovation and Talent Recruitment Base of New Energy Chemistry and Device(B21003).
文摘Alloying transition metals with Pt is an effective strategy for optimizing Pt-based catalysts toward the oxygen reduction reaction(ORR).Atomic ordered intermetallic compounds(IMC)provide unique electronic and geometrical effects as well as stronger intermetallic interactions due to the ordered arrangement of metal atoms,thus exhibiting superior electrocata-lytic activity and durability.However,quantitatively analyzing the ordering degree of IMC and exploring the correlation between the ordering degree and ORR activity remains extremely challenging.Herein,a series of ternary Pt_(2)NiCo interme-tallic catalysts(o-Pt_(2)NiCo)with different ordering degree were synthesized by annealing temperature modulation.Among them,the o-Pt_(2)NiCo which annealed at 800℃for two hours exhibits the highest ordering degree and the optimal ORR ac-tivity,which the mass activity of o-Pt_(2)NiCo is 1.8 times and 2.8 times higher than that of disordered Pt_(2)NiCo alloy and Pt/C.Furthermore,the o-Pt_(2)NiCo still maintains 70.8%mass activity after 30,000 potential cycles.Additionally,the ORR activity test results for Pt_(2)NiCo IMC with different ordering degree also provide a positive correlation between the ordering degree and ORR activity.This work provides a prospective design direction for ternary Pt-based electrocatalysts.
