Wang De, Wang Yanjing, Fu Zhenyu, Xu Yanbin, Yang Li-Xia, Wang Feng, Guo Xiaoling, Sun Wenjuan, Yang Zheng-Long
School of Chemistry and Materials Science, Ludong University, Yantai 264025, PR China.
ACS Appl Mater Interfaces. 2021 Jul 28;13(29):34507-34517. doi: 10.1021/acsami.1c04614. Epub 2021 Jul 13.
Recently, design of cost-effective multifunctional electromaterials for supercapacitors and oxygen evolution reaction (OER) and enhancing their functionalities have become an emphasis in energy storage and conversion. Herein, a series of cheap and functional phosphate composites with different ratios of cobalt and nickel are synthesized using a simple polyalcohol refluxing method, and their excellent capacity and OER properties are systematically studied. Notably, owing to the different major role of Co and Ni elements in the phosphate composites for capacity and OER, the optimal electroconductibility, structural adjustment, electrochemical active sites, and activities for capacity and OER are obtained from the composites with the different ratios of Co/Ni. In addition, using high-capacity BiPO (BPO) as the negative electrodes, the new type of all-phosphate asymmetric supercapacitor (CNPO-40//BPO) shows a high energy density and reaches 36.84 W h kg at a power density of 254.52 W kg. Its cyclic stability is also more excellent than that of the CNPO-40//AC device using commercial activated carbon as the negative electrodes. This study is beneficial to the more in-depth research on efficient dual-function electromaterials in capacity and OER and provides a high-efficient way to improve the practicality of asymmetric supercapacitors using the high-capacity Bi-based electromaterials as the negative electrodes.
最近，用于超级电容器和析氧反应（OER）的具有成本效益的多功能电子材料的设计及其功能增强已成为能量存储和转换领域的一个重点。在此，采用简单的多元醇回流法合成了一系列具有不同钴镍比例的廉价且功能性的磷酸盐复合材料，并系统地研究了它们优异的电容性能和析氧反应性能。值得注意的是，由于钴和镍元素在磷酸盐复合材料中对电容和析氧反应起着不同的主要作用，通过不同钴/镍比例的复合材料获得了最佳的导电性、结构调整、电化学活性位点以及电容和析氧反应活性。此外，以高电容的BiPO（BPO）作为负极，新型全磷酸盐不对称超级电容器（CNPO-40//BPO）在功率密度为254.52 W kg时展现出高能量密度，达到36.84 W h kg 。其循环稳定性也比以商业活性炭为负极的CNPO-40//AC器件更优异。本研究有助于更深入地研究具有高效电容和析氧反应功能的双功能电子材料，并为以高电容铋基电子材料为负极提高不对称超级电容器的实用性提供了一种高效途径。
