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Chemical Science （IF: 9.063）

1. Highly reversible potassium-ion intercalation in tungsten disulfideChem. Sci., 2019, Advance Article

DOI: 10.1039/C8SC04350G

Potassium-ion batteries （PIBs） are a potential alternative to Li-ion batteries, however, intercalation of large K+ can lead to structural degradation and therefore short lifespan of the hosts. Scientists in China have developed a new tungsten disulfide host for intercalation of K+. The material exhibits exceptional structural stability and lifespan, as well as record cyclability for chalcogenides.

钾离子电池（PIB）是锂离子电池的潜在替代者，然而，大量钾离子的嵌入会导致主体的结构性降解，从而造成寿命缩短。中国科学院福建物质结构研究所的科学家们开发出了一种新的二硫化钨主体可以用于钾离子的嵌入。该材料具有出色的结构稳定性和寿命，以及硫属化物创纪录的循环性能。

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2. Picosecond multi-hole transfer and microsecond charge-separated states at the perovskite nanocrystal/tetracene interfaceChem. Sci., 2019, Advance Article

DOI: 10.1039/C8SC04408B

A team of Chinese researchers have discovered that tetracene molecules can enable ultrafast and efficient hole transfer from lead halide perovskite nanocrystals, where it is sometimes kinetically slower than electron transfer leading to limited efficiency of optoelectronic devices. The charge-separated states are shown to be long-lived, and this allows the dissociation of up to 5.6 excitons per nanocrystal by multi-hole transfer for the first time.

中国科学院大连化学物理研究所的研究人员发现并四苯分子可以实现铅卤化物钙钛矿纳米晶体中超快高效的空穴传输。空穴传输在动力学上有时要慢于电子传输，从而导致光电器件的效率受限。研究发现电荷分离状态存在寿命长，并且通过多空穴传输首次实现了每纳米晶体高达5.6个激子的解离。

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Materials Horizons （IF: 13.183）

1. Regulation of carbon content in MOF-derived hierarchical-porous NiO@C films for high-performance electrochromismMater. Horiz., 2019, Advance Article

DOI: 10.1039/c8mh01091a

Efficient insertion/extraction of electrons/ions in electrode materials is crucial for high-performance electrochromic （EC） devices. In this communication, the superiority of MOF derivatives as electrode materials is regarded in the EC field for the first time. For this purpose, we first develop a general pyrolysis strategy for material preparation, and reveal the detailed catalytic graphitization and metal oxidation process in the MOF involved self-templating synthesis. Second, by intentional regulation of in situ carbon, we demonstrate that high electrical conductivity and fast ionic diffusion are simultaneously achieved in the as-synthesized MOF derivatives. Finally, it is confirmed that MOF-derived EC electrodes exhibit superior and stable properties. Based on the above results, we introduce the first proof-of-concept MOF-derived EC device, which has promising potential in various practical applications such as in wearable technologies.

电极材料中电子/离子的有效插入/提取对于高性能电致变色器件至关重要。本文首次确认了在电致变色器件中将金属有机框架（MOF）衍生物作为电极材料的优越性。为此，作者首先开发了一种用于材料制备的通用热解策略，并揭示了包含MOF自模板合成的催化石墨化和金属氧化详细过程。其次，通过调节原位碳，作者证明了合成的MOF衍生物能够同时实现高电导率和快速离子扩散。最后，作者证实了MOF衍生的电致变色电极表现出优异和稳定的性能。基于上述结果，作者介绍了首个概念验证的MOF衍生电致变色器件，该器件在诸如可穿戴技术等各种实际应用中具有很大潜力。

详情请点里链接：RSC主编推荐：材料领域精彩文章快览（免费阅读原文）