Journal ArticleDOI
Highly active Ni-Fe double hydroxides as anode catalysts for electrooxidation of urea
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TLDR
In this article, the NiFe double hydroxide (DH) catalyst showed the highest activity, which achieved a specific current density of ∼95 mA cm−2 mg−1 at 0.5 V vs. Ag/AgCl, about 10 times larger than Ni(OH)2.Abstract:
Urea is a safe and sustainable chemical for electrochemical energy conversion and storage. However, the sluggish kinetic rates of the electrooxidation reaction of urea as well as catalyst stability still remain to be challenges. In this work, we investigated several catalysts for the electro-oxidation of urea by directly growing NiM double hydroxides (M = Cr, Mn, Fe, Co, Cu, Zn) on carbon fibre cloth and nickel foam electrodes through a facile one-step hydrothermal synthesis method. The results indicated that the activity was significantly related to the elemental composition. Among the investigated double hydroxides, the NiFe double hydroxide (DH) catalyst showed the highest activity, which achieved a specific current density of ∼95 mA cm−2 mg−1 at 0.5 V vs. Ag/AgCl, about 10 times larger than that of Ni(OH)2. In addition, the NiFe DH also had a high activity when grown on a Ni foam substrate. This NiFe DH performs well in the aspect of urea oxidation stability, demonstrating it to be a promising low-cost and stable catalyst for the efficient electrooxidation of urea under alkaline conditions.read more
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Journal ArticleDOI
Designing Advanced Catalysts for Energy Conversion Based on Urea Oxidation Reaction.
TL;DR: The recent advances in the design and synthesis of UOR catalysts for urea electrolysis, photoelectrochemical urea splitting, and direct urea fuel cells are reviewed here and particular attention is paid to those design concepts, which specifically target the characteristics of urea molecules.
Journal ArticleDOI
Direct urea fuel cells: Challenges and opportunities
Enas Taha Sayed,Enas Taha Sayed,Tasnim Eisa,Hend Omar Mohamed,Mohammad Ali Abdelkareem,Mohammad Ali Abdelkareem,Anis Allagui,Hussain Alawadhi,Kyu-Jung Chae +8 more
TL;DR: In this paper, the authors present a comprehensive picture of the mechanism of urea oxidation on Ni-based catalysts, the poisoning effect of catalysts and its possible remedies, as well as the different approaches in preparing highly active catalysts.
Journal ArticleDOI
Partially amorphous nickel–iron layered double hydroxide nanosheet arrays for robust bifunctional electrocatalysis
TL;DR: Li et al. as discussed by the authors proposed an in situ grown nickel-iron layered double hydroxide (NiFe LDH) nanosheet array catalyst with partially amorphous characteristics, rich native Ni3+ ions and an optimal Ni:
Journal ArticleDOI
Recent Advances in the Electro-Oxidation of Urea for Direct Urea Fuel Cell and Urea Electrolysis
TL;DR: The development of anodic electro-catalysts is of great significance for improving the electrochemical performance of both DUFCs and urea electrolysis cells, which is systematically summarized in this review.
References
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Journal ArticleDOI
Nickel–Iron Oxyhydroxide Oxygen-Evolution Electrocatalysts: The Role of Intentional and Incidental Iron Incorporation
TL;DR: Measurements of activity as a function of film thickness on Au and glassy carbon substrates are consistent with the hypothesis that Fe exerts a partial-charge-transfer activation effect on Ni, similar to that observed for noble-metal electrode surfaces.
Journal ArticleDOI
An Advanced Ni–Fe Layered Double Hydroxide Electrocatalyst for Water Oxidation
Ming Gong,Yanguang Li,Hailiang Wang,Yongye Liang,Justin Z. Wu,Jigang Zhou,Jian Wang,Tom Regier,Fei Wei,Hongjie Dai +9 more
TL;DR: The synthesis of ultrathin nickel-iron layered double hydroxide nanoplates on mildly oxidized multiwalled carbon nanotubes (CNTs) induced the formation of NiFe-LDH, which exhibits higher electrocatalytic activity and stability for oxygen evolution than commercial precious metal Ir catalysts.
Journal ArticleDOI
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.
Journal ArticleDOI
Nickel–vanadium monolayer double hydroxide for efficient electrochemical water oxidation
Ke Fan,Hong Chen,Yongfei Ji,Hui Huang,Per M. Claesson,Quentin Daniel,Bertrand Philippe,Håkan Rensmo,Fusheng Li,Yi Luo,Licheng Sun,Licheng Sun +11 more
TL;DR: Mechanistic studies indicate that the nickel–vanadium-layered double hydroxides can provide high intrinsic catalytic activity, mainly due to enhanced conductivity, facile electron transfer and abundant active sites, and may expand the scope of cost-effective electrocatalysts for water splitting.
Journal ArticleDOI
Effects of Fe Electrolyte Impurities on Ni(OH)2/NiOOH Structure and Oxygen Evolution Activity
Shannon Klaus,Shannon Klaus,Yun Cai,Yun Cai,Mary W. Louie,Mary W. Louie,Lena Trotochaud,Lena Trotochaud,Alexis T. Bell,Alexis T. Bell +9 more
TL;DR: In this article, the effects of Fe incorporation on structure-activity relationships in Ni(oxy)hydroxide were investigated using electrochemical, in situ Raman, X-ray photoelectron spectroscopy, and electrochemical quartz crystal microbalance measurements.