Enhanced onset potential NiMn-decorated activated carbon as effective and applicable anode in urea fuel cells

Barakat, Nasser A.M.; Alajami, Mohannad; Haj, Yazan Al; Obaid, M.; Al‐Meer, Saeed

doi:10.1016/j.catcom.2017.03.027

Cited by 48 publications

(28 citation statements)

References 21 publications

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“…The stability of the catalyst is also demonstrated by the minor loss of current density after 1000 CV cycles (Figure g). Apart from the above‐two detailed discussed examples, other notable studies on DUFC catalysts include NiMn‐decorated activated carbon, Se‐Ni(OH) 2 ‐shelled NiSe nanowires, NiSn nanoparticle‐incorporated carbon nanofibers, and NiCo‐decorated carbon nanotubes . Their catalytic performance is summarized in Table 3 .…”

Section: Direct Urea Fuel Cellsmentioning

confidence: 99%

Designing Advanced Catalysts for Energy Conversion Based on Urea Oxidation Reaction

Zhu

Liang

Zou

2020

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Urea oxidation reaction (UOR) is the underlying reaction that determines the performance of modern urea‐based energy conversion technologies. These technologies include electrocatalytic and photoelectrochemical urea splitting for hydrogen production and direct urea fuel cells as power engines. They have demonstrated great potentials as alternatives to current water splitting and hydrogen fuel cell systems with more favorable operating conditions and cost effectiveness. At the moment, UOR performance is mainly limited by the 6‐electron transfer process. In this case, various material design and synthesis strategies have recently been reported to produce highly efficient UOR catalysts. The performance of these advanced catalysts is optimized by the modification of their structural and chemical properties, including porosity development, heterostructure construction, defect engineering, surface functionalization, and electronic structure modulation. Considering the rich progress in this field, 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. Particular attention is paid to those design concepts, which specifically target the characteristics of urea molecules. Moreover, challenges and prospects for the future development of urea‐based energy conversion technologies and corresponding catalysts are also discussed.

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Section: Direct Urea Fuel Cellsmentioning

confidence: 99%

Designing Advanced Catalysts for Energy Conversion Based on Urea Oxidation Reaction

Zhu

Liang

Zou

2020

Small

353

270

View full text Add to dashboard Cite

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“…Compressed hydrogen, liquid hydrogen and urea can produce equivalent energy density values of 5.6, 10.1 and 16.9 MJ/L, respectively [6,7,10]. Accordingly, urea-rich wastewaters are deemed an efficient energy source through the following reactions [8,[11][12][13][14][15]:…”

Section: Introductionmentioning

confidence: 99%

“…The lowered electrocatalytic output of anode material in urea fuel cells can hinder their commercialization [2,11]. Platinum-based electrocatalysts exhibit poor electrocatalytic performance despite being widely applied in many reactions [12]. On the other hand, better performance has been achieved using nickel electrodes [5,10,11,[16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Oxidation of Urea on NiCu Alloy Nanoparticles Decorated Carbon Nanofibers

Abutaleb

2019

Catalysts

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Bimetallic Cu3.8Ni alloy nanoparticles (NPs)-anchored carbon nanofibers (composite NFs) were synthesized using a simple electrospinning machine. XRD, SEM, TEM, and TGA were employed to examine the physiochemical characteristics of these composite NFs. The characterization techniques proved that Cu3.8Ni alloy NPs-anchored carbon NFs were successfully fabricated. Urea oxidation (UO) processes as a source of hydrogen and electrical energy were investigated using the fabricated composite NFs. The corresponding onset potential of UO and the oxidation current density (OCD) were measured via cyclic voltammetry as 380 mV versus Ag/AgCl electrode and 98 mA/cm2, respectively. Kinetic study indicated that the electrochemical oxidation of urea followed the diffusion controlled process and the reaction order is 0.5 with respect to urea concentration. The diffusion coefficient of urea using the introduced electrocatalyst was found to be 6.04 × 10−3 cm2/s. Additionally, the composite NFs showed steady state stability for 900 s using chronoamperometry test.

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“…At the same time, water pollution caused by urine has become one of the most serious environmental problems. [15][16][17][18] Urine mainly contains urea, which can be naturally converted into ammonia and nitrogen compounds, causing pollution to the atmospheric environment. [19][20][21] The pollution issues by electrolysis of urea wastewater can be significantly improved.…”

Section: Introductionmentioning

confidence: 99%

Cobalt nitride nanoflakes supported on Ni foam as a high-performance bifunctional catalyst for hydrogen production via urea electrolysis

2019

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Substituting low theoretical potential of the urea oxidation reaction (UOR) for the high theoretical potential of water splitting at the anode (oxygen evolution reaction) is meaningful for hydrogen energy storage and conversion. In this work, a bifunctional catalyst, cobalt nitride nanoflakes supported on Ni foam (CoN NF/NF), was synthesized for both UOR and hydrogen evolution reaction (HER). A two-electrode electrolyzer (CoN NF/NF||CoN NF/NF) was constructed. To drive 100 mA/cm 2 , the voltage of CoN NF/ NF||CoN NF/NF only 1.698 V is required, which is much lower than that of Pt/C||IrO 2 (1.860 V) and the current density can be maintained for 30 h.

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Enhanced onset potential NiMn-decorated activated carbon as effective and applicable anode in urea fuel cells

Cited by 48 publications

References 21 publications

Designing Advanced Catalysts for Energy Conversion Based on Urea Oxidation Reaction

Designing Advanced Catalysts for Energy Conversion Based on Urea Oxidation Reaction

Electrochemical Oxidation of Urea on NiCu Alloy Nanoparticles Decorated Carbon Nanofibers

Cobalt nitride nanoflakes supported on Ni foam as a high-performance bifunctional catalyst for hydrogen production via urea electrolysis

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