A general strategy toward graphene@metal oxide core–shell nanostructures for high-performance lithium storage

Zhou, Weiwei; Zhu, Jixin; Cheng, Chuanwei; Liu, Jinping; Yang, Huanping; Cong, Chunxiao; Guan, Cao; Jia, Xingtao; Fan, Hong Jin; Yan, Qingyu; Li, Chang Ming; Yu, Ting

doi:10.1039/c1ee02168k

Cited by 257 publications

(177 citation statements)

References 47 publications

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“…Further examples of Fe 2 O 3 -graphene composites were also reported in the same year. [ 126,127 ] In particular, in the work of T. Yu et al, [ 127 ] a fi rst attempt to design a general strategy for preparation and testing of graphene/metal oxide hybrids was proposed. One of the main innovations in 2011 may be the combination of graphene with another 2D material such as MoS 2 , belonging to the family of transition metal dichalcogenides.…”

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confidence: 99%

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

et al. 2016

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that its extraordinary properties would enable revolutionary new technologies, which gave birth to the "graphene era". [ 3,4 ] Relying on this scenario, in 2013, the European Union launched the ¤1 billion "Graphene Flagship" project aimed to investigate the properties of this new form of carbon for various applications (e.g., electronics, sensors and energy storage devices), with the ambitious goal of guiding graphene from laboratories to commercial applications within a decade. [ 5,6 ] In the same period, the Chinese Government set up a similar investment to mass-produce graphene as thin fi lms (e.g., for touchscreen electrodes) and platelets (e.g., for use in batteries). [ 6 ] In the following years, hundreds of patents, mainly focused on manufacturing and application in energy storage, were fi led and the worldwide production of graphene and graphene-containing materials rapidly increased. Although a few Chinese industries claimed to already use graphene-containing materials for smartphone production, no revolutionary practical application relying on graphene has been yet developed. [ 6 ] Specifi cally with respect to the battery fi eld, a close analysis of the scientifi c literature reveals a struggle to meet the ambitious initial targets. A potential loss of focus from the fi nal application caused by hype and ease of publication on such a novel matter, together with the delivery of very misleading information [ 7,8 ] and erroneous statements [ 7 ] concerning the use of graphene in batteries are emerging as possible reasons of the ineffective graphene-era outburst. In this progress report, we do not focus on production and classifi cation of graphene and graphene-containing materials, which were already well reported in the past years. [ 3,[9][10][11] In contrast, due to the lack of an exhaustive analysis of the progression of the use of such materials in lithium-ion battery (LIB) anodes, we report here a critical evaluation of the most prominent research papers published from 2008 until the end of 2015. As shown in Figure 1 , three different stages of the graphene research in LIB anodes can be distinguished: a fi rst stationary phase between 2008 and 2010 where the lithium-ion storage properties of different graphene and graphene-containing materials were preliminarily explored, a second exponential stage, spanning from 2010 to 2014, where graphene and graphene-containing anode materials were broadly developed and investigated, and fi nally, a third phase, (i.e., starting from 2015), where the research seems to have approached a plateau. After Used as a bare active material or component in hybrids, graphene has been the subject of numerous studies in recent years. Indeed, from the fi rst report that appeared in late July 2008, almost 1600 papers were published as of the end 2015 that investigated the properties of graphene as an anode material for lithium-ion batteries. Although an impressive amount of data has been collected, a real advance in the fi eld still seems to be missing. In this framework, atten...

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Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

et al. 2016

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“…Copper oxide composites with graphene have been also used in LIBs [22][23][24][25][26][27][28][29][30][31][32][33][34]. Their application in batteries suggests the feasibility of their application in supercapacitors, as similar Faradaic redox reactions to those in LIBs are also used in supercapacitors.…”

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Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

Dong

Wang

Zhao

et al. 2014

Journal of Alloys and Compounds

111

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Reduced graphene oxide/cuprous oxide (RGO/Cu2O) composite films were directly synthesized on the surface of copper foil substrates through a straight redox reaction between GO and Cu foil via a hydrothermal approach. Characterization of the resultant composites with X-ray diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, and field emission scanning electron microscope (FESEM) confirms the formation of Cu2O and reduction of GO, in which Cu2O nanoparticles were well covered by RGO. The resultant composites (referred to as RGO/Cu2O/Cu) were directly used as electrodes for supercapacitors, and their electrochemical performance was assessed by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD), and electrochemical impedance spectrometry (EIS) in 1 M KOH aqueous solution. A specific capacitance of 98.5 F g−1 at 1 A g−1 was obtained, which is much higher than that of pure Cu2O prepared under the same conditions, due to the presence of RGO. Keywordssupercapacitors, synthesis, rgo, cu2o, composite, films, cu, foil, direct Disciplines Engineering | Physical Sciences and Mathematics Publication DetailsDong, X., Wang, K., Zhao, C., Qian, X., Chen, S., Li, Z., Liu, H. & Dou, S. (2014) at 1 A g -1 was obtained, which is much higher than that of pure Cu 2 O prepared under the same conditions, due to the presence of RGO.

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“…另一方面, Cu 2 O 颗粒中夹杂的金属相 Cu 也可以提高纳米颗粒的电子导电性 [8] ; 包裹在颗粒外面的柔性石墨烯层可以缓冲电化学循环过程中 Cu 2 O 的相变体积变化, 在 Cu 2 O 颗粒与集流体之间形成良好的电子和离子输运通道 [11,32] , 从而提高了复合材料的导电能力, 使其获得了优异的电化学循环性能和大倍率充放电性能. …”

Section: 石墨烯包裹unclassified

Fabrication and Lithium-Storage Performances of Graphene-Wrapped Cu₂₊₁O/Cu Composites

Tian¹,

Wei²,

Zhuang³

et al. 2013

Acta Chim. Sinica

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Materials with hybrid metal-semiconductor nanostructures, such as graphene-metal oxides and carbon nanotube-metal oxides, have been intensively exploited as electrode material for lithium ion batteries in recent years. It was found that the structures and properties of the metal-semiconductor herterojunction and the energy level structures of the semiconductor are essential for the conductance of the metal-semiconductor composite. It is thence believed that the conductance, and thus the lithium-storage performance, of the metal-semiconductor composite can be improved by tuning the structures of the metal-semiconductor herterojunction and the energy level structures of the semiconductor. Metal excess defects can occured in metal oxide crystals due to the anions are absent from their lattice sites or the presence of extra cations at interstitial sites. In the metal excess type metal oxide, the electric transport is mainly by "excess" electrons which are present for maintaining the electrical neutrality, and thus possesses a higher conductance. In this work, graphene-wrapped Cu 2 ＋ 1 O/Cu composites were successfully fabricated by using a hydrothermal reaction followed by an in situ thermal reduction. The structures, surface morphologies and the lithium-storage performances of the obtained materials were characterized and investigated by scanning electron microscopy, X-ray diffraction and galvanostatic discharge-charge techniques. In the obtained hybrid material, highly-crystallized Cu 2 ＋ 1 O (Cu 2 O with metal excess defects) successfully formed during the heat treatment processes, Cu 2 ＋ 1 O and Cu particles were homogeneously wrapped by flexible graphene sheets with a well defined core-shell structure. Constant current charge-discharge results showed that graphene-wrapped Cu 2 ＋ 1 O/Cu composite had a higher reversible capacity and excellent cycling stability, delivered a higher initial charge-discharge capacity of 773 and 438 mA•h•g -1 at 50 mA•g -1 and superb cycling performance of 368 mA•h•g -1 after 60 cycles, as well as a favorable rate capabilities and high rate cycling performances, indicating the high conductance and the optimized herterojunctions were achieved by the simultaneously introduction of metal excess defects, metallic copper and graphene in graphene-wrapped Cu 2 ＋ 1 O/Cu composites.

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A general strategy toward graphene@metal oxide core–shell nanostructures for high-performance lithium storage

Cited by 257 publications

References 47 publications

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

Fabrication and Lithium-Storage Performances of Graphene-Wrapped Cu₂₊₁O/Cu Composites

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A general strategy toward graphene@metal oxide core–shell nanostructures for high-performance lithium storage

Cited by 257 publications

References 47 publications

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

Critical Insight into the Relentless Progression Toward Graphene and Graphene‐Containing Materials for Lithium‐Ion Battery Anodes

Direct synthesis of RGO/Cu2O composite films on Cu foil for supercapacitors

Fabrication and Lithium-Storage Performances of Graphene-Wrapped Cu2+1O/Cu Composites

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Fabrication and Lithium-Storage Performances of Graphene-Wrapped Cu₂₊₁O/Cu Composites