Hierarchical flower-like Ni–Co layered double hydroxide nanostructures: synthesis and super performance†,Inorganic Chemistry Frontiers

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Hierarchical flower-like Ni–Co layered double hydroxide nanostructures: synthesis and super performance†
Inorganic Chemistry Frontiers ( IF 6.1 ) Pub Date : 2018-09-26 00:00:00 , DOI: 10.1039/c8qi00931g
Tao Dong _{1,

2,

3,

4} , Xiao Zhang _{5,

6,

7,

8} , Meng Li _{1,

2,

3,

4} , Peng Wang _{1,

2,

3,

4} , Ping Yang _{1,

2,

3,

4}

Affiliation

Three-dimensional hierarchical flower-like Ni–Co layered double hydroxide (LDH) nanostructures composed of porous nanosheets were prepared from Ni–Co precursors under optimized preparation conditions towards applications in energy storage and adsorption. Ni–Co LDHs were formed via an olation reaction and subsequent growth to nanosheet structures. It is found that suitable Ni/Co ratios for precursors resulted in Ni–Co LDHs with a large specific surface area, porous structure and expanded interlayer spacing, which contributed to the improvement in performance for electrochemistry and anionic dye adsorption. In the case of a Ni/Co molar ratio of 1, the Ni–Co LDHs as a sorbent for removing anionic dyes (acid fuchsin and Congo red) in water revealed a high adsorption rate, large adsorption capacity and good recycling performance. Using a molar ratio of Ni/Co of 0.5, the specific capacitance of the as-prepared electrode reached 3168.3 F g⁻¹ at a current density of 1 A g⁻¹ and a large capacitance retention of 90.5% after 3000 cycles at high current density. The Ni–Co LDHs possess enormous application potential as a multifunctional material for supercapacitors and dye adsorption.

中文翻译：

分层的花状Ni-Co层状双氢氧化物纳米结构：合成和超强性能†

由镍-钴前体在优化的制备条件下，制备了由多孔纳米片组成的三维分层花状镍-钴层状双氢氧化物（LDH）纳米结构，以应用于能量存储和吸附。Ni-Co LDHs通过羟化反应并随后生长为纳米片结构。发现适合前体的Ni / Co比值导致Ni-Co LDH具有大的比表面积，多孔结构和扩大的层间间距，从而有助于提高电化学和阴离子染料的吸附性能。在Ni / Co摩尔比为1的情况下，Ni-Co LDHs作为用于去除水中阴离子染料（酸性品红和刚果红）的吸附剂显示出高吸附速率，大吸附能力和良好的循环利用性能。使用0.5的Ni / Co的，所制备的电极的比电容的摩尔比达到3168.3 F G ^-1在1A g的电流密度^-1在高电流密度下经过3000次循环后，电容保持率高达90.5％。Ni-Co LDHs作为多功能材料可用于超级电容器和染料吸附，具有巨大的应用潜力。

更新日期：2018-09-26

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