Unexpected electrochemical oxidation of urea on a new NiCuGO composite catalyst

Wala, Marta; Blacha–Grzechnik, Agata; Stolarczyk, Agnieszka; Bajkacz, Sylwia; Dydo, Piotr; Simka, Wojciech

doi:10.1016/j.ijhydene.2023.05.214

Cited by 8 publications

(7 citation statements)

References 74 publications

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“…Because of the high concentration of chloride ions in urine, eqs 4, 5, and 6 may also play a role in the urea oxidation . The production of intermediates such as NH 3 and NO 2 – could result from incomplete UOR as shown in eq . NO 2 – may be easily oxidized into NO 3 – by O 2 .…”

Section: Discussionmentioning

confidence: 99%

“…48,49 Therefore, the MoNiP/NF-0.50 catalyst had high activity of electrocatalytic UOR. Given the complex composition and neutral pH in urine, the main reactions in the cell could be listed as follows: 9,10,50 Anode:…”

Section: ■ Discussionmentioning

confidence: 99%

“…10 The production of intermediates such as NH 3 and NO 2 − could result from incomplete UOR as shown in eq 3. 50 NO 2…”

Section: ■ Discussionmentioning

confidence: 99%

“…The presence of the Mo(VI)/Mo(IV) redox couple (Figure C) in the MoNiP/NF-0.50 catalyst may promote the surface transformation of Ni 2+ oxidized to Ni 3+ , enabling effective UOR via NiOOH. , As a typical nonmetal element with a variable valence state, P doped in the Ni-based catalyst played an important role in improving the electrocatalytic UOR. , Phosphides can modulate the electronic structure of the Ni–Mo bimetallic catalyst and result in a rapid electron transfer rate during UOR. , Therefore, the MoNiP/NF-0.50 catalyst had high activity of electrocatalytic UOR. Given the complex composition and neutral pH in urine, the main reactions in the cell could be listed as follows: ,, …”

Section: Discussionmentioning

confidence: 99%

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Urine Treatment in a Stacked Membraneless Direct Urea Fuel Cell with Honeycomb-like Nickel–Molybdenum Bimetal Phosphide as the Anodic Electrocatalyst

Li,

Zheng,

Liao

et al. 2024

ACS Sustainable Chem. Eng.

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The aim of this study was to synthesize a novel catalyst for urea oxidation and to test a stacked membraneless direct urea fuel cell (DUFC) with raw urine as fuel. The molybdenum nickel phosphides on nickel foam (MoNiP/NF) were synthesized using a combined hydrothermal and phosphating method. The honeycomb-like MoNiP/NF catalyst with a Mo/Ni molar ratio of 0.50 (i.e., MoNiP/NF-0.50) showed the highest electrocatalytic activity for urea oxidation among different catalysts. The stacked membraneless DUFC was constructed using the MoNiP/NF-0.50 electrode as anode and a gas diffusion cathode. With the electrode spacing of 5 mm and 6 electrode pairs, the stacked membraneless DUFC had a maximum voltage of 0.55 V and a power density of 0.115 mW cm −2 at the external resistance of 1000 Ω, at which the power output was 5.32 times higher than that in the individual membraneless DUFC. The urea removal reached 65.8% in the cell at the external resistance of 100 Ω within 192 h. The excellent performance of the cell could be attributed to the high activity of the MoNiP/NF-0.50 catalyst, small electrode spacing, and multiple electrode pairs. Our results should provide promising potential for scalable DUFC with efficient urine treatment.

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Section: Discussionmentioning

confidence: 99%

Section: ■ Discussionmentioning

confidence: 99%

“…10 The production of intermediates such as NH 3 and NO 2 − could result from incomplete UOR as shown in eq 3. 50 NO 2…”

Section: ■ Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Urine Treatment in a Stacked Membraneless Direct Urea Fuel Cell with Honeycomb-like Nickel–Molybdenum Bimetal Phosphide as the Anodic Electrocatalyst

Li,

Zheng,

Liao

et al. 2024

ACS Sustainable Chem. Eng.

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“…The surfaces composed of nickel were subject to a significant modification to improve their electronic properties, physical characteristics, and electrochemical activity. As a result, various bimetallic electrocatalysts based on nickel have been documented in the literature as Ni-Mo [ 15 , 16 ], Ni-Co [ 17 , 18 ], Ni-Rh [ 19 ], Ni-Mn [ 20 , 21 ], and Ni-Cu [ 22 , 23 , 24 ].…”

Section: Introductionmentioning

confidence: 99%

Chitosan Supports Boosting NiCo2O4 for Catalyzed Urea Electrochemical Removal Application

et al. 2023

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Currently, wastewater containing high urea levels poses a significant risk to human health. Else, electrocatalytic methodologies have the potential to transform urea present in urea-rich wastewater into hydrogen, thereby contributing towards environmental conservation and facilitating the production of sustainable energy. The characterization of the NiCo2O4@chitosan catalyst was performed by various analytical techniques, including scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Furthermore, the activity of electrodes toward urea removal was investigated by several electrochemical techniques. As a function of current density, the performance of the modified NiCo2O4@chitosan surface was employed to remove urea using electrochemical oxidation. Consequently, the current density measurement was 43 mA cm−2 in a solution of 1.0 M urea and 1.0 M KOH. Different kinetic characteristics were investigated, including charge transfer coefficient (α), Tafel slope (29 mV dec−1), diffusion coefficient (1.87 × 10−5 cm2 s−1), and surface coverage 4.29 × 10−9 mol cm−2. The electrode showed high stability whereas it lost 10.4% of its initial current after 5 h of urea oxidation.

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Copper‐Nickel Alloy Modified‐Silicon Photoanodes for Photoelectrochemical Water Oxidation and Urea Oxidation

Klahan,

Loget,

Pattanasattayavong

2024

ChemNanoMat

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The development of silicon (Si) photoanodes for photoelectrochemical (PEC) oxidation is highly crucial for the progress of solar‐driven hydrogen production. Apart from the typical water oxidation reaction or oxygen evolution reaction (OER), the urea oxidation reaction (UOR) is gaining more attention due to favorable thermodynamics. In this work, we study Si photoanodes modified with electrodeposited copper‐nickel (CuNi) alloy for OER and UOR. The optimized photoanodes exhibit a low onset potential of 1.15 V vs reversible hydrogen electrode (RHE) and a current density of 6 mA cm‐2 at 1.23 V vs RHE (the thermodynamic potential for water oxidation) for OER. Further, CuNi alloy‐modified photoanodes can drive the UOR at a lower onset potential (1.05 V vs RHE) and generate a higher current density of 31 mA cm‐2 at 1.23 V vs RHE. Importantly, the CuNi alloy can extend the stability for UOR under PEC conditions when compared to a planar Ni film deposited by a vacuum‐based process. This work demonstrates that CuNi alloy can further improve the properties of inhomogeneous metal‐insulator‐semiconductor Si photoanodes which can be efficiently utilized for both OER and UOR.

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Unexpected electrochemical oxidation of urea on a new NiCuGO composite catalyst

Cited by 8 publications

References 74 publications

Urine Treatment in a Stacked Membraneless Direct Urea Fuel Cell with Honeycomb-like Nickel–Molybdenum Bimetal Phosphide as the Anodic Electrocatalyst

Urine Treatment in a Stacked Membraneless Direct Urea Fuel Cell with Honeycomb-like Nickel–Molybdenum Bimetal Phosphide as the Anodic Electrocatalyst

Chitosan Supports Boosting NiCo2O4 for Catalyzed Urea Electrochemical Removal Application

Copper‐Nickel Alloy Modified‐Silicon Photoanodes for Photoelectrochemical Water Oxidation and Urea Oxidation

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