Tamtam Mohan Rao, Wang Rui, Koutavarapu Ravindranadh, Choi Gyu Sang, Shim Jaesool, Hoai Nguyen To, Nguyen Dang Nam
School of Computer Science and Engineering, College of Digital Convergence, Yeungnam University Gyeongsan 38541 Republic of Korea
School of Mechanical Engineering, College of Engineering, Yeungnam University Gyeongsan 38541 Republic of Korea
Nanoscale Adv. 2025 Feb 24;7(9):2585-2598. doi: 10.1039/d5na00019j. eCollection 2025 Apr 29.
In this work, three distinct synthetic procedures-step-by-step (CC-1), single-step (CC-2), and simple mixing (CC-3)-were utilized to investigate their effects on the formation of heterostructures in bimetallic Cu/Co-MOFs. The resulting MOF crystal structures revealed a 1 : 1 ratio of Co to Cu metal ions, and compared their electrochemical activities with a simple mixture of individual MOFs. To maximize the benefits of these synthesis approaches for supercapacitor uses, electrochemical analyses were conducted. Results revealed that the capacitance of CC-1 was 438 F g at 1 A g, which was 1.14 times and 2.76 times higher than those of the CC-2 and CC-3 samples, respectively. This notable performance was attributed to the synergistic contributions from each 2D material component and the formation of a stable heterostructure that resulted from an optimal metal-ion loading. The best-performing CC-1 electrode was further tested in both asymmetric (AD) and symmetric (SD) coin cell devices. AD demonstrated an energy density (ED) of 40.4 W h kg through a power density (PD) of 302.3 W kg with 75% stability, while the SD device displayed an ED of 15.7 W h kg and a PD of 346.7 W kg with 88% stability.
在这项工作中，采用了三种不同的合成方法——分步合成法（CC-1）、一步合成法（CC-2）和简单混合法（CC-3）——来研究它们对双金属Cu/Co-MOFs中异质结构形成的影响。所得的MOF晶体结构显示Co与Cu金属离子的比例为1:1，并将它们的电化学活性与单个MOF的简单混合物进行了比较。为了最大限度地发挥这些合成方法在超级电容器应用中的优势，进行了电化学分析。结果表明，CC-1在1 A g下的电容为438 F g，分别比CC-2和CC-3样品高1.14倍和2.76倍。这一显著性能归因于每个二维材料组分的协同贡献以及由最佳金属离子负载量导致的稳定异质结构的形成。性能最佳的CC-1电极在非对称（AD）和对称（SD）扣式电池装置中进行了进一步测试。AD通过302.3 W kg的功率密度展示了40.4 W h kg的能量密度（ED），稳定性为75%，而SD装置展示了15.7 W h kg的ED和346.7 W kg的PD，稳定性为88%。
