Journal ArticleDOI
Scalable electrode materials with nanoporous current collector shells for supercapacitors with ultrahigh areal and volumetric capacitances
Ruitao Zhou,Ying Li,Kwok Ho Lam +2 more
TLDR
In this paper, hollow active materials were confined inside nano-scale current collectors to achieve high specific capacitance and high energy density of supercapacitors at the desired scale, and the resulting nanoporous Fe3O4-MCNTs@Ni electrodes exhibited a superhigh areal capacitance of 82.6 F cm−2 as well as a high volumetric capacitance.Abstract:
Supercapacitors are characterized by high power density, but a bottleneck exists regarding their limited energy density due to the conflict between achieving high mass loading and high specific capacitance with the current structural design. Although there have been concerted efforts to develop supercapacitors with high specific capacitance using nanostructured materials, the total mass loading of active materials is confined by their nano-scale thickness. Here we report an effective strategy to integrate active materials and current collectors through binding active materials and current collectors together in a 3D style. Contrary to the conventional configuration, hollow active materials were confined inside nano-scale current collectors in this work. The resulting nano-scale electrode materials could be compressed together in a scalable style to form nanoporous Fe3O4@Ni freestanding electrodes at the desired scale. Consequently, symmetric supercapacitors were fabricated by Fe3O4@Ni electrodes, and showed a capacitance of 11.2 F cm−2, corresponding to an energy density of 94.4 mW h cm−3. The supercapacitor also exhibited an excellent cyclic capability with a capacitance retention of 107% after 10 000 cycles. The scalability of the electrode materials could be further enhanced by the addition of multiwalled carbon nanotubes (MCNTs) during the synthesis process, and the resulting 0.665-thick Fe3O4-MCNTs@Ni electrode with an Fe3O4 content of 79.4 mg cm−2 exhibited a superhigh areal capacitance of 82.6 F cm−2 as well as a high volumetric capacitance of 1242 F cm−3. This work demonstrates that large mass loading, large specific capacitance, high energy density, and good cyclability of supercapacitors can be achieved simultaneously through the effective structural design of electrodes at the multi-scale.read more
Citations
More filters
Journal ArticleDOI
Metal–organic framework-derived hollow Co9S8 nanotube arrays coupled with porous FeCo-P nanosheets as efficient electrode material for hybrid supercapacitor
TL;DR: In this article , the capacity and electrochemical cyclability of Co9S8 is not satisfactory for supercapacitors, and it is extremely important to combine the two materials.
References
More filters
Journal ArticleDOI
Where Do Batteries End and Supercapacitors Begin
TL;DR: Electrochemical measurements can distinguish between different types of energy storage materials and their underlying mechanisms, used to recover power in cars and electric mass transit vehicles that would otherwise lose braking energy as heat.
Journal ArticleDOI
Pseudocapacitive oxide materials for high-rate electrochemical energy storage
TL;DR: In this article, the pseudocapacitance properties of transition metal oxides have been investigated and a review of the most relevant pseudo-capacitive materials in aqueous and non-aqueous electrolytes is presented.
Journal ArticleDOI
Nanoporous metal/oxide hybrid electrodes for electrochemical supercapacitors
TL;DR: It is shown that hybrid structures made of nanoporous gold and nanocrystalline MnO(2) have enhanced conductivity, resulting in a specific capacitance of the constituent MnO (2) (~1,145 F g(-1)) that is close to the theoretical value.
Journal ArticleDOI
Efficient storage mechanisms for building better supercapacitors
Mathieu Salanne,Mathieu Salanne,Mathieu Salanne,Benjamin Rotenberg,Benjamin Rotenberg,Katsuhiko Naoi,Katsumi Kaneko,Pierre-Louis Taberna,Pierre-Louis Taberna,Clare P. Grey,Bruce Dunn,Patrice Simon,Patrice Simon,Patrice Simon +13 more
TL;DR: In this paper, the authors review recent progress, from both in situ experiments and advanced simulation techniques, in understanding the charge storage mechanism in carbon- and oxide-based supercapacitors.
Journal ArticleDOI
Flexible Solid-State Supercapacitors Based on Carbon Nanoparticles/MnO2 Nanorods Hybrid Structure
Longyan Yuan,Xihong Lu,Xihong Lu,Xu Xiao,Teng Zhai,Teng Zhai,Junjie Dai,Fengchao Zhang,Bin Hu,Xue Wang,Xue Wang,Li Gong,Jian Chen,Chenguo Hu,Yexiang Tong,Jun Zhou,Zhong Lin Wang,Zhong Lin Wang +17 more
TL;DR: A highly flexible solid-state supercapacitor was fabricated through a simple flame synthesis method and electrochemical deposition process based on a carbon nanoparticles/MnO(2) nanorods hybrid structure using polyvinyl alcohol/H(3)PO(4) electrolyte to highlight the path for its enormous potential in energy management.