Du Meng, Geng Pengbiao, Pei Chenxu, Jiang Xinyuan, Shan Yuying, Hu Wenhui, Ni Lubin, Pang Huan
School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu, 225009, P. R. China.
Angew Chem Int Ed Engl. 2022 Oct 10;61(41):e202209350. doi: 10.1002/anie.202209350. Epub 2022 Sep 8.
The introduction of high-entropy into Prussian blue analogues (PBAs) has yet to attract attention in the field of lithium-sulfur battery materials. Herein, we systematically synthesize a library of PBAs from binary to high-entropy by a facile coprecipitation method. The coordination environment in PBAs is explored by X-ray absorption fine structure spectroscopy, which together with elemental mapping confirm the successful introduction of all metals. Importantly, electrochemical tests demonstrate that high-entropy PBA can serve as polysulfide immobilizer to inhibit shuttle effect and as catalyst to promote polysulfides conversion, thereby boosting its outstanding performance. Additionally, a variety of nanocubic metal oxides from binary to senary are fabricated by using PBAs as sacrificial precursors. We believe that a wide range of new materials obtained from our coprecipitation and pyrolysis methodology can promote further developments in research on PBA systems and sulfur hosts.
将高熵引入普鲁士蓝类似物（PBAs）在锂硫电池材料领域尚未引起关注。在此，我们通过简便的共沉淀法系统地合成了一系列从二元到高熵的PBAs。通过X射线吸收精细结构光谱对PBAs中的配位环境进行了探索，结合元素映射证实了所有金属的成功引入。重要的是，电化学测试表明，高熵PBA可以作为多硫化物固定剂来抑制穿梭效应，并作为催化剂促进多硫化物转化，从而提升其优异性能。此外，以PBAs为牺牲前驱体，制备了从二元到六元的各种纳米立方金属氧化物。我们相信，通过我们的共沉淀和热解方法获得的一系列新材料可以推动PBA体系和硫宿主研究的进一步发展。
