Journal Article10.1007/S12274-015-0781-3
Facile electrodeposition of 3D concentration-gradient Ni-Co hydroxide nanostructures on nickel foam as high performance electrodes for asymmetric supercapacitors
Mingyang Yang,Mingyang Yang,Hua Cheng,Yingying Gu,Zhifang Sun,Jing Hu,Lujie Cao,Fucong Lv,Minchan Li,Minchan Li,Wenxi Wang,Zhenyu Wang,Zhenyu Wang,Shaofei Wu,Hongtao Liu,Zhouguang Lu +15 more
TL;DR: In this paper, a 3D concentration-gradient Ni-Co hydroxide nanostructures (3DCGNC) was grown on nickel foam by a facile stepwise electrochemical deposition method and intensively investigated as binder-free electrode for supercapacitors.
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Abstract: Novel three-dimensional (3D) concentration-gradient Ni-Co hydroxide nanostructures (3DCGNC) have been directly grown on nickel foam by a facile stepwise electrochemical deposition method and intensively investigated as binder- and conductor-free electrode for supercapacitors. Based on a three-electrode electrochemical characterization technique, the obtained 3DCGNC electrodes demonstrated a high specific capacitance of 1,760 F·g−1 and a remarkable rate capability whereby more than 62.5% capacitance was retained when the current density was raised from 1 to 100 A·g−1. More importantly, asymmetric supercapacitors were assembled by using the obtained 3DCGNC as the cathode and Ketjenblack as a conventional activated carbon anode. The fabricated asymmetric supercapacitors exhibited very promising electrochemical performances with an excellent combination of high energy density of 103.0 Wh·kg−1 at a power density of 3.0 kW·kg−1, and excellent rate capability—energy densities of about 70.4 and 26.0 Wh·kg−1 were achieved when the average power densities were increased to 26.2 and 133.4 kW·kg−1, respectively. Moreover, an extremely stable cycling life with only 2.7% capacitance loss after 20,000 cycles at a current density of 5 A·g−1 was achieved, which compares very well with the traditional doublelayer supercapacitors.
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Citations
2D Layered Double Hydroxides for Oxygen Evolution Reaction: From Fundamental Design to Application
Abstract: The oxygen evolution reaction (OER) has aroused extensive interest from materials scientists in the past decade by virtue of its great significance in the energy storage/conversion systems such as water splitting, rechargeable metal–air batteries, carbon dioxide (CO2) reduction, and fuel cells. Among all the materials capable of catalyzing OER, layered double hydroxides (LDHs) stand out as one of the most effective electrocatalysts owing to their compositional and structural flexibility as well as the tenability and the simplicity of their preparation process. For this reason, numerous efforts have been dedicated to adjusting the structure, forming the well‐defined morphology, and developing the preparation methods of LDHs to promote their electrocatalytic performance. In this article, recent advances in the rational design of LDH‐based electrocatalysts toward OER are summarized. Specifically, various tactics for the synthetic methods, as well as structural and composition regulations of LDHs, are further highlighted, followed by a discussion on the influential factors for OER performance. Finally, the remaining challenges to investigate and improve the catalyzing ability of LDH electrocatalysts are stated to indicate possible future development of LDHs.
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Layered double hydroxides toward high-performance supercapacitors
TL;DR: In this paper, a review of the recent advances in the designing of LDH-based electrode materials for supercapacitors is presented, highlighting the feasible and practical strategies for improving the capacitive performance of these materials.
400
Conductive silver nanowires-fenced carbon cloth fibers-supported layered double hydroxide nanosheets as a flexible and binder-free electrode for high-performance asymmetric supercapacitors
TL;DR: In this paper, the binder-free nickel-cobalt layered double hydroxide nanosheets on Ag NWs-fenced carbon cloth (NC LDH NSs@Ag@CC) were successfully deposited by a facile electrochemical deposition method with a chronoamperometry voltage of −1.0
303
Recent progress in first row transition metal Layered double hydroxide (LDH) based electrocatalysts towards water splitting: A review with insights on synthesis
TL;DR: In this paper , a review summarises, recent research efforts towards fabrication of LDHs systems including adopted modification strategies; doping/defect engineering, exchanging interlayer anion, nanostructured morphology, designing hierarchical heterostructure or nanocomposites, etc.
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Transition-metal-based layered double hydroxides tailored for energy conversion and storage
Rajkumar Patel,Jung Tae Park,Madhumita Patel,J. K. Dash,E. Bhoje Gowd,Rajshekhar Karpoormath,Amaresh Mishra,Jeonghun Kwak,Jong Hak Kim +8 more
TL;DR: In this article, the growth of active NiCo LDH material in situ or ex situ on the current collector and how the synthesis can affect the crystal structure as well as the electrochemical performance of the electrode.
206
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Nickel–Cobalt Hydroxide Nanosheets Coated on NiCo2O4 Nanowires Grown on Carbon Fiber Paper for High-Performance Pseudocapacitors
TL;DR: A series of flexible nanocomposite electrodes were fabricated by facile electro-deposition of cobalt and nickel double hydroxide (DH) nanosheets on porous NiCo2O4 nanowires grown radially on carbon fiber paper (CFP) for high capacity, high energy, and power density supercapacitors.
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