Aziz Sk Tarik, Kumar Sushil, Riyajuddin Sk, Ghosh Kaushik, Nessim Gilbert Daniel, Dubal Deepak P
Department of Chemistry, Bar Ilan Institute for Nanotechnology and Advanced Materials (BINA), Bar Ilan University, Ramat-Gan 52900, Israel.
Institute of Nano Science & Technology, Habitat Centre, Phase-10, Sector-64, Mohali 160062, India.
J Phys Chem Lett. 2021 Jun 3;12(21):5138-5149. doi: 10.1021/acs.jpclett.1c00562. Epub 2021 May 25.
Supercapacitors (SCs) are considered promising energy storage systems because of their high power output and long-term cycling stability; however, they usually exhibit poor energy density. The hybrid supercapacitor (HSC) is an emerging concept in which two dissimilar electrodes with different charge storage mechanisms are paired to deliver high energy without sacrificing power output. This Perspective highlights the features of transition-metal phosphides (TMPs) as the positive electrode in HSCs. In particular, bimetallic nickel cobalt phosphide (NiCoP) with multiple redox sites, excellent electrochemical reversibility, and stability is discussed. We outline how the rational heterostructures, elemental variations, and nanocomposite morphologies tune the electrochemical properties of NiCoP as the positive electrode in HSCs. The Perspective further sheds light on NiCoP-based composites that help in improving the overall performance of HSCs in terms of energy density and cycling stability. The key scientific challenges and perspectives on building efficient and stable HSCs for future applications are discussed.
超级电容器（SCs）因其高功率输出和长期循环稳定性而被认为是很有前景的储能系统；然而，它们通常表现出较差的能量密度。混合超级电容器（HSC）是一个新兴概念，其中具有不同电荷存储机制的两个不同电极配对以在不牺牲功率输出的情况下提供高能量。本观点文章突出了过渡金属磷化物（TMPs）作为混合超级电容器正极的特点。特别讨论了具有多个氧化还原位点、优异的电化学可逆性和稳定性的双金属镍钴磷化物（NiCoP）。我们概述了合理的异质结构、元素变化和纳米复合形态如何调节NiCoP作为混合超级电容器正极的电化学性能。该观点文章进一步阐明了有助于提高混合超级电容器在能量密度和循环稳定性方面整体性能的基于NiCoP的复合材料。讨论了构建用于未来应用的高效稳定混合超级电容器的关键科学挑战和前景。
