Duan Huiyu, Shi Mei, Zhang Mengfei, Feng Geyu, Liu Suli, Chen Changyun
Key Laboratory of Advanced Functional Materials of Nanjing, School of Environmental Science, Nanjing Xiaozhuang University, Nanjing, China.
Front Chem. 2021 Nov 11;9:783942. doi: 10.3389/fchem.2021.783942. eCollection 2021.
Transition metal hydroxides are a kind of promising electrode material in electrochemical energy storage, but the poor conductivity limits their application. Lanthanides are good proton conductors and can usually improve the intrinsic conductivity of other materials. By integrating the merits of lanthanide elements and transition metal hydroxide, we designed lanthanum oxide nickel hydroxide composites (LONH) with unique ultrathin triangle nanosheet morphology via a controllable synthetic strategy for high-performance supercapacitors. When the LONH is used as positive electrode material in aqueous asymmetric supercapacitor, it reveals an energy density (107.8 W h kg at 800 W kg), rate performance (86.9% retention at 4 kW kg) and outstanding cycle stability (more than 90% retention after 3,000 cycles). This work confirms that compositing LaO and Ni(OH) can significantly improve the supercapacitor performance of both pristine LaO and transition metal hydroxide composites. We hope this work would offer a good prospect for developing other lanthanide-transition metal hydroxide composites as an attractive class of electrode materials in electrochemical energy storage.
过渡金属氢氧化物是电化学储能领域一种很有前景的电极材料，但导电性差限制了它们的应用。镧系元素是良好的质子导体，通常可以提高其他材料的本征导电性。通过整合镧系元素和过渡金属氢氧化物的优点，我们通过一种可控的合成策略设计了具有独特超薄三角形纳米片形态的氧化镧氢氧化镍复合材料（LONH），用于高性能超级电容器。当LONH用作水系不对称超级电容器的正极材料时，它展现出能量密度（在800 W kg时为107.8 W h kg）、倍率性能（在4 kW kg时保持率为86.9%）以及出色的循环稳定性（3000次循环后保持率超过90%）。这项工作证实，将LaO和Ni(OH)复合可以显著提高原始LaO和过渡金属氢氧化物复合材料的超级电容器性能。我们希望这项工作能为开发其他镧系 - 过渡金属氢氧化物复合材料作为电化学储能领域一类有吸引力的电极材料提供良好的前景。
