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Reduction of a clear graphene oxide solution using sodium dithionite. Graphene flakes appear "out of nothing". Observation in regular intervals for altogether 45 minutes 

Reduction of a clear graphene oxide solution using sodium dithionite. Graphene flakes appear "out of nothing". Observation in regular intervals for altogether 45 minutes 

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... This clearly shows that MoSe 2 /MXene/C has the smallest high-frequency concave semicircle and the smaller interfacial resistance. The proposed design strategy provides a broad prospect for the development of more useful PIBs electrode materials [250] . ...
... The inset shows the corresponding equivalent circuits for data fitting, where Rct, Zw, RF, CPE and RS represent contact resistance, constant-phase element, electrolyte resistance, charge-transfer resistance and Warburg ion-diffusion resistance, respectively. Reproduced with permission from Ref.[250] (Copyright 2019, American Chemical Society). ...
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Energy storage devices such as batteries hold great importance for society, owing to their high energy density, environmental benignity and low cost. However, critical issues related to their performance and safety still need to be resolved. The periodic table of elements is pivotal to chemistry, physics, biology and engineering and represents a remarkable scientific breakthrough that sheds light on the fundamental laws of nature. Here, we provide an overview of the role of the most prominent elements, including s-block, p-block, transition and inner-transition metals, as electrode materials for lithium-ion battery systems regarding their perspective applications and fundamental properties. We also outline hybrid materials, such as MXenes, transition metal oxides, alloys and graphene oxide. Finally, the challenges and prospects of each element and their derivatives and hybrids for future battery systems are discussed, which may provide guidance towards green, low-cost, versatile and sustainable energy storage devices.
... There are a number of methods for synthesis of 2D materials, as listed in Figure 3a, including: Hummer's method [48], micromechanical cleavage [1,49,50], liquid exfoliation [51] assisted by ion intercalation [52][53][54][55] and mechanical force [47,[56][57][58][59], oxidation assisted liquid exfoliation [17,49,60], chemical vapor deposition [61][62][63][64][65], wet chemical synthesis method [66][67][68][69], electrochemical exfoliation [70][71][72][73][74], ball milling [51,75], etching-assisted exfoliation etc. [76][77][78]. All these methods can be grouped in two major classes of top-down and bottom-up approaches. ...
... All these methods can be grouped in two major classes of top-down and bottom-up approaches. There are a number of methods for synthesis of 2D materials, as listed in Figure 3a, including: Hummer's method [48], micromechanical cleavage [1,49,50], liquid exfoliation [51] assisted by ion intercalation [52][53][54][55] and mechanical force [47,[56][57][58][59], oxidation assisted liquid exfoliation [17,49,60], chemical vapor deposition [61][62][63][64][65], wet chemical synthesis method [66][67][68][69], electrochemical exfoliation [70][71][72][73][74], ball milling [51,75], etching-assisted exfoliation etc. [76][77][78]. All these methods can be grouped in two major classes of top-down and bottom-up approaches. ...
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