Active sites-rich layered double hydroxide for nitrate-to-ammonia production with high selectivity and stability

2022 ◽  
pp. 134641
Author(s):  
Feng Du ◽  
Jingsha Li ◽  
Changhong Wang ◽  
Jixin Yao ◽  
Zixuan Tan ◽  
...  
Keyword(s):  
Layered Double Hydroxide ◽  
Active Sites ◽  
High Selectivity ◽  
Ammonia Production ◽  
Double Hydroxide

scholarly journals Engineering single-atomic ruthenium catalytic sites on defective nickel-iron layered double hydroxide for overall water splitting

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Panlong Zhai ◽  
Mingyue Xia ◽  
Yunzhen Wu ◽  
Guanghui Zhang ◽  
Junfeng Gao ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Water Splitting ◽  
Layered Double Hydroxide ◽  
Hydrogen Evolution Reaction ◽  
Active Sites ◽  
Density Functional ◽  
Rational Design ◽  
Single Atom ◽  
Nickel Iron ◽  
Double Hydroxide

AbstractRational design of single atom catalyst is critical for efficient sustainable energy conversion. However, the atomic-level control of active sites is essential for electrocatalytic materials in alkaline electrolyte. Moreover, well-defined surface structures lead to in-depth understanding of catalytic mechanisms. Herein, we report a single-atomic-site ruthenium stabilized on defective nickel-iron layered double hydroxide nanosheets (Ru1/D-NiFe LDH). Under precise regulation of local coordination environments of catalytically active sites and the existence of the defects, Ru1/D-NiFe LDH delivers an ultralow overpotential of 18 mV at 10 mA cm−2 for hydrogen evolution reaction, surpassing the commercial Pt/C catalyst. Density functional theory calculations reveal that Ru1/D-NiFe LDH optimizes the adsorption energies of intermediates for hydrogen evolution reaction and promotes the O–O coupling at a Ru–O active site for oxygen evolution reaction. The Ru1/D-NiFe LDH as an ideal model reveals superior water splitting performance with potential for the development of promising water-alkali electrocatalysts.

Facile Synthesis of Ni–Mn Layered Double Hydroxide Nanopetals on 3D Reduced Graphene Oxide/Ni Foam for High-Performance Supercapacitors

NANO ◽  
2020 ◽  
Vol 15 (02) ◽  
pp. 2050021
Author(s):  
Qi Tang ◽  
Menghan Ye ◽  
Li Ma ◽  
Tao Zhou ◽  
Mengyu Gan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Layered Double Hydroxide ◽  
Electrode Material ◽  
Active Sites ◽  
Retention Rate ◽  
Ni Foam ◽  
Reduced Graphene ◽  
Capacitance Performance ◽  
Double Hydroxide

In this work, the Ni–Mn layered double hydroxide (Ni–Mn LDH) nanopetals are fabricated on three-dimensional reduced graphene oxide/Ni foam (RGO/NF) by one-step hydrothermal method, in which the suspension of graphene oxide (GO) is directly reduced by nickel foam (NF) to obtain NF/RGO. The composite, which consists of interconnected Ni–Mn LDH nanopetals, forms a macroporous structure. Such an open space can promote electrolyte dispersion and ion diffusion of active substances, thus enhancing capacitance performance. Remarkable, during crystal growth, RGO can not only provide active sites for Ni–Mn LDH nanopetals, but also effectively connect Ni–Mn LDH nanopetals to NF, further promoting the electrochemical behavior of composite material. Moreover, RGO possess reasonable chemical stability which can improve the mechanical properties of the composite to obtain good stability. The experimental results show that the NF/RGO electrode material with Ni–Mn LDH nanopetals has excellent specific capacitance of 2250[Formula: see text]F[Formula: see text]g[Formula: see text] at 1[Formula: see text]A[Formula: see text]g[Formula: see text], good rate performance (the capacitance retention rate is still 64.0% at 10[Formula: see text]A[Formula: see text]g[Formula: see text] and excellent cycle life (45.1% at 10[Formula: see text]A[Formula: see text]g[Formula: see text] after 5000 cycles). NR/NM–LDH is used as the positive electrode and activated carbon is used as the negative electrode to assemble the asymmetric supercapacitor, the proper power density and energy density indicates that the NR/NM–LDH composite has great potential as an electrode material for supercapacitors.

Electrodepositing Pd on NiFe layered double hydroxide for improved water electrolysis

2019 ◽  
Vol 3 (5) ◽  
pp. 842-850 ◽  
Author(s):  
Jinxue Guo ◽  
Jikang Sun ◽  
Yanfang Sun ◽  
Qingyun Liu ◽  
Xiao Zhang
Keyword(s):  
Charge Transfer ◽  
Water Splitting ◽  
Layered Double Hydroxide ◽  
Active Sites ◽  
Nickel Foam ◽  
Water Electrolysis ◽  
Pd Nanoparticles ◽  
Intrinsic Activity ◽  
Overall Water Splitting ◽  
Double Hydroxide

Ultrafine Pd nanoparticles with less than 0.12 at% are electrodeposited on nickel foam supported NiFe LDH to obtain improved intrinsic activity, more active sites, and enhanced charge transfer for improved bifunctionality towards overall water splitting.

Assembly of alizarin red S/boric acid ultrathin films based on layered double hydroxide for fluorescence turn on detection of tiopronin

2016 ◽  
Vol 4 (16) ◽  
pp. 3415-3421 ◽  
Author(s):  
Haiqin Wu ◽  
Lan Jin
Keyword(s):  
Boric Acid ◽  
Layered Double Hydroxide ◽  
Ultrathin Films ◽  
High Selectivity ◽  
Alizarin Red S ◽  
Alizarin Red ◽  
Turn On ◽  
Fluorescence Turn On ◽  
Double Hydroxide

New facile, economical and fluorescent (ARS–H3BO3/LDH)n UTFs were developed, exhibiting response to tiopronin with high selectivity, precision and reversibility.

scholarly journals A template-directed synthesis of metal–organic framework (MOF-74) ultrathin nanosheets for oxygen reduction electrocatalysis

RSC Advances ◽  
2021 ◽  
Vol 11 (16) ◽  
pp. 9353-9360
Author(s):  
Rui Fan ◽  
Ning Kang ◽  
Yuzhen Li ◽  
Lizhen Gao
Keyword(s):  
Layered Double Hydroxide ◽  
Active Sites ◽  
Metal Organic Framework ◽  
Dimensional Structure ◽  
Two Dimensional ◽  
Ultrathin Nanosheets ◽  
Directed Synthesis ◽  
Metal Organic ◽  
Double Hydroxide ◽  
Enhanced Conductivity

Layered double hydroxide (LDH) is employed as a layered template to synthesize ultrathin Ni-MOF-74 nanosheets. The two-dimensional structure brings numerous exposed unsaturated active sites and enhanced conductivity for Ni-MOF-74.

Design and Preparation of Three-Dimensional Hetero-electrocatalysts of NiCo -Layered Double Hydroxide Nanosheets Incorporated with Silver Nanoclusters for Enhanced Oxygen Evolution Reactions

Nanoscale ◽  
2021 ◽  
Author(s):  
Bingxian Chu ◽  
Qiuxia Ma ◽  
Ze-Sheng Li ◽  
Bolin Li ◽  
Furong Huang ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
Active Sites ◽  
Three Dimensional ◽  
Silver Nanoclusters ◽  
Double Hydroxide ◽  
Double Hydroxides

Layered double hydroxides (LDHs) are one of the most effective electrocatalysts. However, it is still needed to improve the lower conductivity and limited active sites of LDHs to enhance their...

scholarly journals Layered double hydroxide-based electrocatalysts for the oxygen evolution reaction: identification and tailoring of active sites, and superaerophobic nanoarray electrode assembly

2021 ◽  
Author(s):  
Daojin Zhou ◽  
Pengsong Li ◽  
Xiao Lin ◽  
Adam McKinley ◽  
Yun Kuang ◽  
...  
Keyword(s):  
Oxygen Evolution ◽  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
Oxygen Evolution Reaction ◽  
Active Sites ◽  
Double Hydroxide ◽  
Double Hydroxides

Opportunities and challenges in tailoring layered double hydroxides and constructing them into superaerophobic nanoarray electrodes for an efficient oxygen evolution reaction

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