Urea electro-oxidation efficiently catalyzed by nickel-molybdenum oxide nanorods

Yang, Dawen; Yang, Liting; Zhong, Lei; Yu, Xu; Feng, Ligang

doi:10.1016/j.electacta.2018.10.190

Cited by 98 publications

(48 citation statements)

References 44 publications

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“…Fig. S5) as observed previously 33,34 . In addition, the effect of urea and KOH concentration revealed saturation kinetics of UOR on the Ni@C catalyst (Suppl.…”

Section: Electrocatalytic Properties Of Ni-mof Ni@c and Nio@c The supporting

confidence: 89%

“…4b) exhibited redox peaks (with increased oxidation peak intensity and decreased reduction peak intensity) at the similar potentials as those observed in 0.1 M KOH in the absence of urea, which confirmed the activity of these catalysts for urea oxidation occurring via Ni 2+ /Ni 3+ redox pathway; www.nature.com/scientificreports www.nature.com/scientificreports/ i.e., Ni 3+ OOH was formed by electrochemical oxidation of Ni 2+ (OH) 2 and it catalyzed chemical oxidation of the adsorbed urea while being reduced to Ni 2+ OH, called an indirect electrochemical-chemical (EC) mechanism 13,33 . The result, therefore, implied that Ni 3+ OOH, a high valence of Ni oxide 34,35 , was the active site for UOR. As seen in Fig.…”

Section: Electrocatalytic Properties Of Ni-mof Ni@c and Nio@c The mentioning

confidence: 90%

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Metal–organic framework–derived Ni@C and NiO@C as anode catalysts for urea fuel cells

Tran

Park

Yun

et al. 2020

Sci Rep

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Highly porous self-assembled nanostructured ni@c and nio@c were synthesized via calcination of a ni-based metal-organic framework. the morphology, structure, and composition of as synthesized ni@c and nio@c were characterized by SeM, fiB-SeM, teM, and XRD. the electro-catalytic activity of the ni@c and nio@c catalysts towards urea oxidation was investigated using cyclic voltammetry. It was found that the Ni@C had a higher residual carbon content and a higher specific surface area than nio@c, thus exhibiting an enhanced electrochemical performance for urea oxidation. A direct urea fuel cell with Ni@C as an anode catalyst featured an excellent maximum power density of 13.8 mW cm −2 with 0.33 M urea solution in 1 M KOH as fuel and humidified air as oxidant at 50 °C, additionally showing excellent stability during continuous 20-h operation. Thus, this work showed that the highly porous carbon-supported ni catalysts derived from ni-based metal-organic framework can be used for urea oxidation and as an efficient anode material for urea fuel cells.

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“…Fig. S5) as observed previously 33,34 . In addition, the effect of urea and KOH concentration revealed saturation kinetics of UOR on the Ni@C catalyst (Suppl.…”

Section: Electrocatalytic Properties Of Ni-mof Ni@c and Nio@c The supporting

confidence: 89%

Section: Electrocatalytic Properties Of Ni-mof Ni@c and Nio@c The mentioning

confidence: 90%

Metal–organic framework–derived Ni@C and NiO@C as anode catalysts for urea fuel cells

Tran

Park

Yun

et al. 2020

Sci Rep

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“…It can be understood that the electrocatalysis of urea in an alkaline solution produces water, carbon dioxide, and nitrogen . But the sophisticated charge‐transfer and gas evolution processes of such reaction result in inherent sluggish kinetics, therefore, an effective electrocatalyst is necessary to boost the UOR.…”

Section: Electrocatalytic Properties Of Catalysts For Uormentioning

confidence: 77%

Carbon Anchored Epitaxially Grown Nickel Cobalt‐Based Carbonate Hydroxide for Urea Electrooxidation Reaction with a High Activity and Durability

et al. 2020

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Urea has shown a potential importance as a possible alternative hydrogen-storage source for low-temperature fuel cells. Besides, the electrooxidation of urea provides an efficient solution for the disposal of wastewater in the agricultural industry, but the state-of-the art urea electrocatalysis suffers from the associated sluggish kinetics. In this study, we fabricated unique vertically aligned nanorod arrays-like carbon anchored nickel-cobalt carbonate hydroxides (CÀ NiCo CHs) without agglomeration through a mass scale one-step hydrothermal approach for electrocatalytic oxidation of urea in an alkaline environment. The composite affords a high specific surface area of 162.55 m 2 g À 1 with distinctive porous features, suggesting a large surface exposure and sufficient electrolyte accessibility during chemical reactions. The catalyst exhibits an outstanding electrocatalytic activity towards urea electrooxidation with a high current density and an outstanding durability benefiting from the tuned electric conductivity. Impressively, the hybrid shows a greatly improved catalytic performance at higher KOH moieties with a much-enhanced peak current and a negatively shifted onset voltage, which can be interpreted by the intensive Ni activation processes caused by the densely formed OH À ions. These findings signify that the well-developed nanoarchitecture of CÀ NiCo CHs hybrid could pave the way to rationally fabricate highly active electrocatalysts for urea electrocatalysis.[a] Dr.

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“…Cyclic voltammetry of the synthesized materials in 1 mol L -1 KOH and 0.33 mol L -1 of urea and ν = 10 mV s -1 surface. 32 Because of this, a relatively low potential was chosen for the stability analysis. A decline in catalytic activity is noted, which may be related to the adsorption of intermediates such as CO on the surface of the catalysts.…”

Section: Electrochemical Experimentsmentioning

confidence: 99%

Ni/C-CeO2 with Different Morphologies of CeO2 Towards Urea Electro-Oxidation Reaction

Tanabe¹,

Barbosa²,

Checca³

et al. 2020

Rev. Virtual Quim.

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Resumo: A ureia, além de estar presente na urina humana, é produzida como fertilizante em indústrias. Dessa forma, grande quantidade desse composto é lançada diariamente em efluentes. A oxidação eletroquímica da ureia é um método promissor para remoção desse composto. Assim, neste trabalho, nanopartículas de Ni suportadas em carbono e CeO 2 com diferentes morfologias, foram sintetizadas com o intuito de estudar a influência da presença do CeO 2 no processo de eletro-oxidação de ureia. As análises de difração de raios-x (DRX) revelaram a presença das fases Ni° e Ni(OH) 2 e confirmaram a presença do CeO 2 e do carbono. As imagens de microscopia eletrônica de transmissão (MET) confirmaram nanofios de CeO 2 com diâmetros de 15 nm e nanopartículas de Ni com 2 nm de tamanho. A atividade catalítica dos materiais foi investigada por experimentos de voltametria cíclica (VC) e cronoamperometria (CA), nos quais foi mostrado que a presença de céria aumentou a atividade catalítica na reação de oxidação eletroquímica da ureia. Urea, in addition to being present in human urine, is produced as a fertilizer in industries. Thus, a large amount of this compound is discharged daily into effluents. The electrochemical oxidation of urea is a promising method for removing this compound. Thus, in this work, Ni nanoparticles supported on carbon and CeO 2 with different morphologies were synthesized in order to study the influence of CeO 2 in the urea electro-oxidation process. X-ray diffraction (XRD) analyzes revealed the presence of the Ni° and Ni(OH) 2 phases and confirmed the presence of CeO 2 and carbon. Transmission electron microscopy (TEM) images confirmed CeO 2 nanowires with diameter of 15 nm and Ni nanoparticles with 2 nm in size. The catalytic activity of the materials was investigated by cyclic voltammetry (CV) and chronoamperometry (CA) experiments, in which it was shown that the presence of ceria increased the catalytic activity in the electrochemical oxidation of urea reaction.

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Urea electro-oxidation efficiently catalyzed by nickel-molybdenum oxide nanorods

Cited by 98 publications

References 44 publications

Metal–organic framework–derived Ni@C and NiO@C as anode catalysts for urea fuel cells

Metal–organic framework–derived Ni@C and NiO@C as anode catalysts for urea fuel cells

Carbon Anchored Epitaxially Grown Nickel Cobalt‐Based Carbonate Hydroxide for Urea Electrooxidation Reaction with a High Activity and Durability

Ni/C-CeO2 with Different Morphologies of CeO2 Towards Urea Electro-Oxidation Reaction

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