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Versatile Inorganic Oligomer-based Photochromic Spiropyrane Gels
Jiajia Song, Wei Duan, Yun Chen* and Xiangyang Liu*
In this cover picture, a green inorganic oligomer-based spiropyrans composite gelatinous system is constructed based on the calcium ionic nanocrystalline core controlled by capping agent TEA and the flexible cavities in soft materials surrounding the nanocrystalline. This material exhibits excellent cyclic reversible discoloration properties and application potential for hydrazine detection.
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Boosting Stable and Fast Potassium Storage of Iron Sulfide through Rational Yolk-Shell Design and Ni Doping

Yanmei Gan, Jiajie Zhu, Qixin Zhang, Chaoying Wang, Lunhui Guan and Yi Zhao*

Chin. J. Struct. Chem. 2022, 41, 2205030-2205036  DOI: 10.14102/j.cnki.0254-5861.2022-0044

May 20, 2022

FeS2, Ni-doping, yolk-shell structure, anode, potassium-ion batteries

ABSTRACT

Metal sulfides have been regarded as promising anodes for potassium-ion batteries (PIBs) due to their high theoretical capacities, while the performance is limited by their intrinsic poor conductivity and large volume fluctuation during the insertion/extraction of large potassium ion. Herein, the battery performance of iron sulfide anode is significantly enhanced through yolk-shell (Y-S) structure design and nickel doping, aiming to realize good structure stability and superior electron/ion transportation. For potassium storage, as-prepared Y-S Ni-FeS2@C shows excellent cyclic performance and sustains high capacities of 328 mA h g-1 after 100 cycles at 0.2 A g-1 and 226 mA h g-1 after 1000 cycles at 1 A g-1. Especially, it displays a superior rate capacity of 200 mA h g-1 at 20 A g-1, higher than that of Y-S FeS2@C and most as-reported metal sulfide anodes for PIBs. The experimental analysis and theoretical calculation illuminate the effect of Ni-doping on decreasing the particle size of iron sulfide and enhancing the ion/electron transport ability, thus accounting for the exceptional rate capability of Y-S Ni-FeS2@C composite.

                                   

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