NiX Layered Double Hydroxide Nanowire Arrays (X = Co, Fe, and Mn) Coated with Nanometer-Thick Films of NiOOH and Then NiO as Electrodes for Supercapacitors
05 Jul 2021-Vol. 4, Iss: 7, pp 7017-7027
TL;DR: In this article, the authors introduce an approach for forming a high-quality, uniform thin film of nickel oxide (NiO) that can act as an auxiliary nickel oxyhydroxide (NiOOH) layer during redox cycling in an alkaline electrolyte.
Abstract: Owing to their low cost, transition metal layered double hydroxides (LDHs) have the potential to become the electrode material of choice for supercapacitors if they can provide good cyclic stability and high specific capacity. Herein, we introduce an approach for forming a high-quality, uniform thin film of nickel oxide (NiO) that can act as an auxiliary nickel oxyhydroxide (NiOOH) layer during redox cycling in an alkaline electrolyte. This approach leads to a core/double-shell NiCo-LDH/NiOOH/ALD-NiO electrode that exhibits an unprecedented specific capacity of 1420.2 C g–1 (even at 4 A g–1), retaining 93% of the capacity after 20,000 cycles. Even when combined with a simple anode of activated carbon, an asymmetric supercapacitor with this cathode provides an energy density of 72.6 W h kg–1 with exceptional durability (9.1% loss over 10,000 cycles). This extraordinary electrode when combined with an articulated anode in a supercapacitor is expected to meet or exceed the current energy density limit of lithium-ion batteries.
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TL;DR: In this paper , 2D nickel cobalt layered double hydroxide (NCLDH) nanosheets are regulated to form 3D flower-like spheres by fungus bran-derived carbon dots (CDs) via an in situ growth method.
18 citations
TL;DR: In this paper , the advantages and current achievements of MOOH (M = Fe, Co, Ni, Mn, V, and Al) in electrochemical energy storage (EES) devices, including supercapacitors (SCs), lithium ion batteries (LIBs), and sodium-ion batteries (SIBs), were discussed.
13 citations
TL;DR: In this article , a conformal nickel oxide (NiO) layer whose roughness was readjusted according to its thickness was successfully fabricated on a flexible substrate, and the NiO film exhibited a high areal capacitance of 1.51 mF cm−2 at an optical transparency of > 81 % when employed as a TFSC electrode, and it outperformed other state-of-the-art TFSC electrodes.
3 citations
TL;DR: In this paper , the authors present the actual state-of-the-art of active multifunctional surfaces based on layered double hydroxides (LDH) post-treatment, including modifications with polymers, hydrophobic molecules and intercalation of functional species into their galleries.
2 citations
TL;DR: In this paper , binder-free 2D/2D FeCo 2 O 4 @Ni(OH) 2 core-shell architectures were successfully grown on a Ni-foam (NF) substrate.
1 citations
References
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TL;DR: In this article, a facile and novel one-step method of growing nickel-cobalt layered double hydroxide (Ni-Co LDH) hybrid films with ultrathin nanosheets and porous nanostructures on nickel foam is presented using cetyltrimethylammonium bromide as nanostructure growth assisting agent but without any adscititious alkali sources and oxidants.
Abstract: A facile and novel one-step method of growing nickel-cobalt layered double hydroxide (Ni-Co LDH) hybrid films with ultrathin nanosheets and porous nanostructures on nickel foam is presented using cetyltrimethylammonium bromide as nanostructure growth assisting agent but without any adscititious alkali sources and oxidants. As pseudocapacitors, the as-obtained Ni-Co LDH hybrid film-based electrodes display a significantly enhanced specific capacitance (2682 F g−1 at 3 A g−1, based on active materials) and energy density (77.3 Wh kg−1 at 623 W kg−1), compared to most previously reported electrodes based on nickel-cobalt oxides/hydroxides. Moreover, the asymmetric supercapacitor, with the Ni-Co LDH hybrid film as the positive electrode material and porous freeze-dried reduced graphene oxide (RGO) as the negative electrode material, exhibits an ultrahigh energy density (188 Wh kg−1) at an average power density of 1499 W kg−1 based on the mass of active material, which greatly exceeds the energy densities of most previously reported nickel or cobalt oxide/hydroxide-based asymmetric supercapacitors.
1,203 citations
TL;DR: In this paper, the most recent progress in the development of nanostructured electrode materials for EC technology is described, with a particular focus on hybrid nano-structured materials that combine carbon based materials with pseudocapacitive metal oxides or conducting polymers for achieving high-performance ECs.
941 citations
TL;DR: In this article, an additive-free nano-architectured nickel hydroxide/carbon nanotube (Ni(OH)2/CNT) electrode was proposed for high energy density supercapacitors.
Abstract: The demand for advanced energy storage devices such as supercapacitors and lithium-ion batteries has been increasing to meet the application requirements of hybrid vehicles and renewable energy systems. A major limitation of state-of-art supercapacitors lies in their relatively low energy density compared with lithium batteries although they have superior power density and cycle life. Here, we report an additive-free, nano-architectured nickel hydroxide/carbon nanotube (Ni(OH)2/CNT) electrode for high energy density supercapacitors prepared by a facile two-step fabrication method. This Ni(OH)2/CNT electrode consists of a thick layer of conformable Ni(OH)2 nano-flakes on CNT bundles directly grown on Ni foams (NFs) with a very high areal mass loading of 4.85 mg cm−2 for Ni(OH)2. Our Ni(OH)2/CNT/NF electrode demonstrates the highest specific capacitance of 3300 F g−1 and highest areal capacitance of 16 F cm−2, to the best of our knowledge. An asymmetric supercapacitor using the Ni(OH)2/CNT/NF electrode as the anode assembled with an activated carbon (AC) cathode can achieve a high cell voltage of 1.8 V and an energy density up to 50.6 Wh/kg, over 10 times higher than that of traditional electrochemical double-layer capacitors (EDLCs).
796 citations
TL;DR: In this article, an all-wood-structured asymmetric supercapacitor (ASC) based on an activated wood carbon (AWC) anode, a wood membrane separator and a MnO2/wood carbon (MnO2@WC) cathode is presented.
Abstract: In energy storage devices, the critical demands for high energy/power density, low cost, long cycle lives and environmental friendliness have highlighted an urgent need for developing storage electrodes with low cost, large thickness, high mass loading, low tortuosity and high energy/power density. Here we demonstrate the design and construction of an all-wood-structured asymmetric supercapacitor (ASC) based on an activated wood carbon (AWC) anode, a wood membrane separator and a MnO2/wood carbon (MnO2@WC) cathode. The structural virtues of the all-wood-structured ASC device – desirable thickness (up to ∼1 mm), direct channels with low tortuosity, high electronic and ionic conductivity – enable ASC high areal mass loadings (up to 30 mg cm−2 for the anode and 75 mg cm−2 for the wood carbon/MnO2 composite cathode), a high energy density of 1.6 mW h cm−2 and a maximum power density of 24 W cm−2, representing the highest mass loading and areal energy/power densities among all reported MnO2-based supercapacitors. Moreover, all components in the all-wood-structured ASC are low-cost, environmentally friendly and biocompatible. With these unique features, the all-wood-structured ASC represents a promising energy storage device to realize high mass loading, high energy/power density, and biocompatibility for green and renewable energy storage.
544 citations
TL;DR: The high specific capacitance and charge-discharge rates offered by such MnO(2)/Mn/Mn O(2) sandwich-like nanotube arrays make them promising candidates for supercapacitor electrodes, combining high-energy densities with high levels of power delivery.
Abstract: We demonstrate the design and fabrication of novel nanoarchitectures of MnO2/Mn/MnO2 sandwich-like nanotube arrays for supercapacitors. The crystalline metal Mn layers in the MnO2/Mn/MnO2 sandwich-like nanotubes uniquely serve as highly conductive cores to support the redox active two-double MnO2 shells with a highly electrolytic accessible surface area and provide reliable electrical connections to MnO2 shells. The maximum specific capacitances of 937 F/g at a scan rate of 5 mV/s by cyclic voltammetry (CV) and 955 F/g at a current density of 1.5 A/g by chronopotentiometry were achieved for the MnO2/Mn/MnO2 sandwich-like nanotube arrays in solution of 1.0 M Na2SO4. The hybrid MnO2/Mn/MnO2 sandwich-like nanotube arrays exhibited an excellent rate capability with a high specific energy of 45 Wh/kg and specific power of 23 kW/kg and excellent long-term cycling stability (less 5% loss of the maximum specific capacitance after 3000 cycles). The high specific capacitance and charge–discharge rates offered by su...
403 citations