Stephanie Ruth, Park Chan Yeong, Hyun Moon Seop, Ghaferi Amal Al, Han Hee, Alhajri Ebrahim, Chodankar Nilesh R, Park Tae Jung
Department of Chemistry, Research Institute of Chem-Bio Diagnostic Technology, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul, 06974, Republic of Korea.
Department of Measurement & Analysis, National NanoFab Center (NNFC), Daejeon, 34141, Republic of Korea.
Small. 2025 Apr;21(14):e2406369. doi: 10.1002/smll.202406369. Epub 2024 Sep 25.
MXenes exhibit a unique combination of properties-2D structure, high conductivity, exceptional capacity, and chemical resistance-making them promising candidates for hybrid supercapacitors (HSCs). However, the development of MXene-based HSCs is often hindered by the limited availability of cathode materials that deliver comparable electrochemical performance, especially in protic electrolytes. In this study, this challenge is addressed by introducing a durable protic HSC utilizing a bimetallic Prussian Blue Analogue (PBA) decorated on reduced graphene oxide (rGO) as a nanocomposite cathode paired with a single-layered TiCT MXene (SL-MXene) anode. The bimetallic PBA, specifically nickel hexacyanocobaltate (NiHCC), is utilized by virtue of its open and stable structure that facilitates efficient charge storage, leading to enhanced stability and energy storage capabilities. The resulting NiHCC/rGO//SL-MXene cell demonstrates impressive performance, achieving a maximum specific energy of 38.03 Wh kg and a power density of 20 666.67 W kg. Remarkably, the NiHCC/rGO//SL-MXene HSC cell also exhibits excellent cycling stability without any loss even after 15 000 cycles while retaining ≈100% coulombic efficiency. This work underscores the potential of bimetallic PBA materials with conductive rGO backbone for overcoming the limitations of current MXene-based protic HSCs, highlighting the significance of this work.
MXenes展现出独特的性能组合——二维结构、高导电性、出色的容量和耐化学性，使其成为混合超级电容器（HSCs）的有前景的候选材料。然而，基于MXene的HSCs的发展常常受到阴极材料可用性有限的阻碍，这些阴极材料难以提供相当的电化学性能，尤其是在质子电解质中。在本研究中，通过引入一种耐用的质子HSC来应对这一挑战，该HSC利用装饰在还原氧化石墨烯（rGO）上的双金属普鲁士蓝类似物（PBA）作为纳米复合阴极，与单层TiCT MXene（SL-MXene）阳极配对。双金属PBA，特别是六氰合钴酸镍（NiHCC），因其开放且稳定的结构而被利用，该结构有助于高效电荷存储，从而提高稳定性和能量存储能力。由此产生的NiHCC/rGO//SL-MXene电池展现出令人印象深刻的性能，实现了38.03 Wh kg的最大比能量和20666.67 W kg的功率密度。值得注意的是，NiHCC/rGO//SL-MXene HSC电池还表现出优异的循环稳定性，即使在15000次循环后也没有任何损失，同时保持约100%的库仑效率。这项工作强调了具有导电rGO骨架的双金属PBA材料在克服当前基于MXene的质子HSCs局限性方面的潜力，突出了这项工作的重要性。
