Core/shell design of efficient electrocatalysts based on NiCo<sub>2</sub>O<sub>4</sub>nanowires and NiMn LDH nanosheets for rechargeable zinc–air batteries

Guo, Xiaolong; Zheng, Tianxu; Ji, Guipeng; Hu, Ning; Xu, Chaohe

doi:10.1039/c8ta02608d

Cited by 158 publications

(69 citation statements)

References 70 publications

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“…All samples exhibited small and similar series resistance (0.7–1.1 Ω), which was due to the resistance of the solution, indicating good electrical contacts with the conductive substrate as a result of the in situ‐grown porous Ni film and the NiFe LDH nanosheets. No obvious semicircle can be observed in the high frequency region for NiFe/Ni/Ni and Ni/Ni (inset of Figure c), which confirmed the absence of Warburg impedance, indicating faster mass transport . For the NiFe/Ni sample, a semicircle clearly existed in the high frequency region.…”

Section: Resultsmentioning

confidence: 99%

NiFe Hydroxide Supported on Hierarchically Porous Nickel Mesh as a High‐Performance Bifunctional Electrocatalyst for Water Splitting at Large Current Density

et al. 2019

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The preparation of efficient and low‐cost bifunctional catalysts with superior stability for water splitting is a topic of significant current interest for hydrogen generation. A facile strategy has been developed to fabricate highly active electrodes with hierarchical porous structures by using a two‐step electrodeposition method, in which NiFe layered double hydroxide is grown in situ on a three‐dimensional hierarchical Ni mesh (NiFe/Ni/Ni). The as‐prepared NiFe/Ni/Ni electrodes demonstrate remarkable structural stability with high surface areas, effective gas transportation, and fast electron transfer. Benefiting from the unique structure, the self‐supported NiFe/Ni/Ni electrodes exhibit overpotentials of 190 mV and 300 mV for the oxygen evolution reaction (OER) at current densities of 10 and 500 mA cm−2, respectively. Furthermore, the self‐supported NiFe/Ni/Ni electrodes also exhibit high performance in the hydrogen evolution reaction (HER) and excellent stability at a current density of 500 mA cm−2 for both OER and HER. Remarkably, using NiFe/Ni/Ni as both the cathode and anode for alkaline water electrolysis, a current density of 500 mA cm−2 is attained at a cell voltage of 1.96 V. Additionally, the water electrolyzer demonstrates superior stability even at a large current density (500 mA cm−2) when subjected to high temperatures.

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Section: Resultsmentioning

confidence: 99%

NiFe Hydroxide Supported on Hierarchically Porous Nickel Mesh as a High‐Performance Bifunctional Electrocatalyst for Water Splitting at Large Current Density

et al. 2019

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“…The most popular and oldest method to prepare NiMn LDHs is co-precipitation, where dissolvable Ni and Mn salts are reacted with some basic chemicals under rather low temperatures in aqueous solutions. Ammonia solution [ 23 , 24 ], NaOH and Na 2 CO 3 [ 25 , 26 ], LiOH [ 27 ], hexamethylenetetramine [ 28 ] and urea [ 29 ] can be used as basic chemicals to produce hydroxide anions.…”

Section: The Synthesis Methods Of Nimn Ldhsmentioning

confidence: 99%

Research Progress of NiMn Layered Double Hydroxides for Supercapacitors: A Review

2018

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The research on supercapacitors has been attractive due to their large power density, fast charge/discharge speed and long lifespan. The electrode materials for supercapacitors are thus intensively investigated to improve the electrochemical performances. Various transition metal layered double hydroxides (LDHs) with a hydrotalcite-like structure have been developed to be promising electrode materials. Earth-abundant metal hydroxides are very suitable electrode materials due to the low cost and high specific capacity. This is a review paper on NiMn LDHs for supercapacitor application. We focus particularly on the recent published papers using NiMn LDHs as electrode materials for supercapacitors. The preparation methods for NiMn LDHs are introduced first. Then, the structural design and chemical modification of NiMn LDH materials, as well as the composites and films derived from NiMn LDHs are discussed. These approaches are proven to be effective to enhance the performance of supercapacitor. Finally, the reports related to NiMn LDH-based asymmetric supercapacitors are summarized. A brief discussion of the future development of NiMn LDHs is also provided.

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“…In spite of considerable researches related to pristine LDH‐INEs have been made and showed a trend of rapid growth, inferior electrical conductivity and limited active sites resulted restricted electrocatalytic performance still hinder the widely application of pristine LDH‐INEs . To further improve the electrochemical performance of pristine LDH‐INEs and expand the application areas, the fabrication of more sophisticated materials both in dimension, composition, and structure is badly needed.…”

Section: Ldh‐inesmentioning

confidence: 99%

Integrated Nanostructural Electrodes Based on Layered Double Hydroxides

Xie

Song

et al. 2019

Energy & Environ Materials

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Layered double hydroxides (LDHs), as a class of typical two‐dimensional materials, have sparked increasing interest in the field of energy storage and conversion. In the last few years, the research about LDHs as electrode active materials has seen much progress in terms of structure designing, material synthesis, properties tailoring, and applications. In this review, we focus on the integrated nanostructural electrodes (INEs) construction using LDH materials, including pristine LDH‐INEs, hybrid LDH‐INEs, and LDH derivative‐INEs, as well as the performance advantages and applications of LDH‐INEs. Moreover, in the final section, the insights about challenges and prospective in this promising research field were concluded, especially in regulation of intrinsic activity and uncovering of structure–activity relationship, which would push forward the development of this fast‐growing field.

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Core/shell design of efficient electrocatalysts based on NiCo₂O₄nanowires and NiMn LDH nanosheets for rechargeable zinc–air batteries

Abstract: Core/shell structured NiCo2O4@NiMn LDH hybrids were fabricated as efficient electrocatalysts for rechargeable Zn–air batteries.

Cited by 158 publications

References 70 publications

NiFe Hydroxide Supported on Hierarchically Porous Nickel Mesh as a High‐Performance Bifunctional Electrocatalyst for Water Splitting at Large Current Density

NiFe Hydroxide Supported on Hierarchically Porous Nickel Mesh as a High‐Performance Bifunctional Electrocatalyst for Water Splitting at Large Current Density

Research Progress of NiMn Layered Double Hydroxides for Supercapacitors: A Review

Integrated Nanostructural Electrodes Based on Layered Double Hydroxides

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Core/shell design of efficient electrocatalysts based on NiCo2O4nanowires and NiMn LDH nanosheets for rechargeable zinc–air batteries

Abstract: Core/shell structured NiCo2O4@NiMn LDH hybrids were fabricated as efficient electrocatalysts for rechargeable Zn–air batteries.

Cited by 158 publications

References 70 publications

NiFe Hydroxide Supported on Hierarchically Porous Nickel Mesh as a High‐Performance Bifunctional Electrocatalyst for Water Splitting at Large Current Density

NiFe Hydroxide Supported on Hierarchically Porous Nickel Mesh as a High‐Performance Bifunctional Electrocatalyst for Water Splitting at Large Current Density

Research Progress of NiMn Layered Double Hydroxides for Supercapacitors: A Review

Integrated Nanostructural Electrodes Based on Layered Double Hydroxides

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Product

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Core/shell design of efficient electrocatalysts based on NiCo₂O₄nanowires and NiMn LDH nanosheets for rechargeable zinc–air batteries