Iron oxide promoted nickel/nickel oxide rough nanorods for efficient urea assisted water splitting

Gu, Xiaocong; Yang, Dawen; Zong, Liu; Wang, Shuli; Feng, Ligang

doi:10.1016/j.electacta.2020.136516

Cited by 49 publications

(24 citation statements)

References 45 publications

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“…Most synthesis methods are multi-step, take long time, low yield, contain solvents, and are not suitable for scaled production. [27][28][29][30][31][32][33][34] On the other hand, many materials contain surfacants and the size of them is relatively large (>50 nm), [33][34][35][36][37][38] which mask a large number of active sites so that catalysts cannot be utilized fully. Therefore, it is particularly important to synthesize surfactant-free ultra-small (<5 nm) nanocatalysts with excellent performance and largescale production.In this work, a series of noble metal doped ultra-small size (4 nm) M-Ni/NiO nanoparticals supported on CNT (M = Ir, Ru, Pd, CNT is carboxylated multi-walled carbon nanotube) were prepared by solvent-free microwave method that is simple, fast, high yield (82.7%), large-scale (>1 g), and no surfactants for the first time.…”

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Systematic Engineering on Ni‐Based Nanocatalysts Effectively Promote Hydrogen Evolution Reaction

Liu

Wang

Zhang

et al. 2022

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Designing a synthesis of ultra‐small Ni‐based nanomaterials with high intrinsic activity and stability in alkaline hydrogen evolution reaction (HER) is a major challenge. Herein, a series of noble metal doped ultra‐small size (4 nm) M‐Ni/NiO nanoparticles supported on CNT are rationally designed by a solvent‐free microwave reduction method that is fast (60 s), simple, includes no surfactants, extensive (>1 g), and has high yield (82.7%). The Ir‐Ni/NiO@CNT has superior performance with a low overpotential of 24.6 mV at 10 mA cm−2. In addition, the turnover frequency (TOF) value up to 2.51 s−1 and the exchange current density reaches 4.34 mA cm−2, indicating that the catalyst has better intrinsic catalytic activity. It is further proved by density functional theory (DFT) that the NiO surface is conducive to the adsorption of OH* in the Volmer step while the Ni is inclined to adsorb H*, which synergistically promotes the water‐splitting reaction, thereby increasing the catalytic rate of HER. It is believed that this work will provide valuable contributions and inspirations toward the large‐scale production of high‐performance Ni‐based electrocatalysts for HER.

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confidence: 99%

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Systematic Engineering on Ni‐Based Nanocatalysts Effectively Promote Hydrogen Evolution Reaction

Liu

Wang

Zhang

et al. 2022

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“…145 Iron oxide promoted nickel/nickel oxide rough nanorods demonstrated efficiency for urea-assisted water electrolysis. 146 The content of iron oxide greatly influenced the crystal structure, roughness, and electrochemically active surface area of the hybrid catalysts. As a urea-assisted water electrolysis catalyst, this catalyst showed a current density of 30 mA cm −2 at 1.45 V, about 20 times higher than that of pure water oxidation; the cell voltage can be reduced to 1.49 V for 10 mA cm −2 , about 120 mV lower than that of pure water electrolysis in the two-electrode catalytic systems.…”

Section: Feni Catalysts For Oermentioning

confidence: 99%

“…In 2015, Ni/Fe oxides formed on NiFe foam after acid etching showed much higher OER activity than bare NiFe foam . Iron oxide promoted nickel/nickel oxide rough nanorods demonstrated efficiency for urea-assisted water electrolysis . The content of iron oxide greatly influenced the crystal structure, roughness, and electrochemically active surface area of the hybrid catalysts.…”

Section: Water Splitting Reactionmentioning

confidence: 99%

A Review on Advanced FeNi-Based Catalysts for Water Splitting Reaction

2020

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Water splitting as an advanced energy conversion technology driven by sustainable energy is attracting ever-increasing attention for clean hydrogen fuel generation from water. Two fundamental reactions, hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), are involved, and cost-effective catalysts are required to fulfill the energy transfer process. Nonprecious-metal catalysts have been proposed as the mainstay for future commercial applications. Among them, iron−nickel (FeNi)based catalysts are very promising benefiting from the FeNi synergistic interaction in promoting the basic reactions. With the help of rational structure design, composition optimization, and electronic state tuning, advanced catalysts based on FeNi have been extensively reported. Herein, we focus on the varied FeNi-based catalysts for water splitting reactions. Before reviewing the literature, some descriptors and perspective comments are first given in the parameter evaluation part that might be helpful for understating the catalytic capability. In light of the extensive reports, some typical examples of FeNi-based catalysts classified into FeNi-alloy, phosphides, oxides, layered double hydroxides, sulfides, tellurides, selenides, and fluorides are introduced in detail. Combined with these advanced catalysts and the performance evaluation, this review will be helpful for readers in understanding the advanced progress on FeNi-based catalysts for water splitting reaction. Problems and challenges are also discussed demonstrating that efficient catalysts that can maintain high activity and stability are still highly desired. A brief perspective on FeNi-based catalysts is proposed that we hope can be a good complement to the existing literature for a better understanding of FeNi-based catalysts for water splitting reaction.

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“…With the continuously growing energy requirement in the development of society, fossil fuels would be facing with exhaustion. Meanwhile, climatic change and environmental pollution associated with the use of fossil fuels have become increasingly serious [1,2]. In the future, the energy market will definitely develop toward clean, renewable, low carbon, and high efficiency.…”

Section: Introductionmentioning

confidence: 99%

Amorphous heterogeneous NiFe-LDH@Co(OH)2 supported on nickel foam as efficient OER electrocatalysts

Yang

Zhou

Jiao

et al. 2021

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Oxygen evolution reaction (OER) is considered as the bottleneck of electrochemical water splitting because of its sluggish kinetics. Therefore, the design and synthesis of highly active, low-cost, and stable electrocatalysts for the OER is the greatest challenge in electrochemical water splitting. Here, an amorphous heterogeneous NiFe-LDH@Co(OH) 2 @NF with abundant active sites is fabricated by a step-wise electrodeposition technique. Firstly, Co(OH) 2 is directly deposited onto nickel foam (NF) substrate by a electrodeposition technique. Secondly, NiFe-layered double hydroxide (NiFe-LDH) is further covered on the surface of Co(OH) 2 to obtain the heterogeneous NiFe-LDH@Co(OH) 2 @NF electrocatalyst. The thickness of NiFe-LDH can be controlled by changing the time of electrochemical deposition. Benefiting from the amorphous structure and the positive synergies between NiFe-LDH and Co(OH) 2 , the optimized NiFe-LDH@Co(OH) 2 @NF-300 shows high electrocatalysis activity. In the 1 M KOH solution, the overpotential for OER is only 130 mV (at 10 mA cm −2 ). Remarkably, serving as a bifunctional electrode in alkaline electrolyzer, it only needs 1.6 V to reach the current density of 10 mA cm −2 . The work provides a simple and viable technical solution for fabricating non-noble electrocatalysts with excellent performance for electrochemical water splitting.

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Iron oxide promoted nickel/nickel oxide rough nanorods for efficient urea assisted water splitting

Cited by 49 publications

References 45 publications

Systematic Engineering on Ni‐Based Nanocatalysts Effectively Promote Hydrogen Evolution Reaction

Systematic Engineering on Ni‐Based Nanocatalysts Effectively Promote Hydrogen Evolution Reaction

A Review on Advanced FeNi-Based Catalysts for Water Splitting Reaction

Amorphous heterogeneous NiFe-LDH@Co(OH)2 supported on nickel foam as efficient OER electrocatalysts

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