Unique three-dimensional nanoflower-like NiCu electrodes constructed by Co, S co-doping for efficient ammonia oxidation reaction

Wang, Hailong; Tong, Xing; Zhou, Luanqi; Wang, Yifei; Liao, Linfeng; Ouyang, Shujuan; Zhang, Huimin

doi:10.1016/j.seppur.2022.122293

Cited by 17 publications

(5 citation statements)

References 50 publications

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“…This characteristic favors crucial reaction steps in AOR, such as the generation of the NH x + cation radical, as well as the adsorption of NH 3 and desorption of the final *N 2 species. Similarly, Cu 2 O wire-in-Ni(OH) 2 plate, Co, S codoping NiCu, NiO–TiO 2 , CNT-Ni, and core–shell NiCu@NiCuOOH electrocatalysts were successfully prepared and tested for AOR.…”

Section: Ammonia Electrolysismentioning

confidence: 99%

Recent Advances in Ammonia Electrolysis for Sustainable Hydrogen Generation

Babar,

Botte

2024

ACS Sustainable Chem. Eng.

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Advancing sustainable and clean energy technology is crucial in addressing the current energy and environmental crisis. Hydrogen has garnered significant attention as an energy carrier due to its abundance, high energy density, and zero carbon emissions. Given the challenges associated with hydrogen storage and transportation, the electrolysis of ammonia presents significant potential for renewable energy. This process offers a promising solution that meets both energy supply needs and environmental protection goals as it serves as a carbon-free fuel with high hydrogen content. However, ammonia electrolysis comprises a sluggish ammonia oxidation reaction (AOR), and understanding the complex mechanisms and intermediates involved in AOR is necessary. The development of sustainable, low-cost, and efficient catalysts for AOR plays an important role in accelerating the reaction kinetics and boosting the performance of the AOR process. This review summarizes the state of the art on aqueous AOR mechanisms, heterogeneous catalysts for AOR including platinum (Pt), Pt-based alloys, and transition-metal-based catalysts, along with their performance using various strategies. Finally, perspectives and opportunities for future development of ammonia electrolysis technology are discussed.

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Section: Ammonia Electrolysismentioning

confidence: 99%

Recent Advances in Ammonia Electrolysis for Sustainable Hydrogen Generation

Babar,

Botte

2024

ACS Sustainable Chem. Eng.

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“…However, typical non-noble metal-based electrocatalysts exhibited AOR performance in high overpotential, and thus, the AOR competes with competitive reactions, such as water oxidation or NH 3 oxidation to NO 3 − or NO 2 − , and so on. However, it was found that forming alloys with hetero-atoms can alter the electronic structure of catalysts resulting in reducing the NH 3 adsorption energy barrier and effectively reducing the overpotential [27,61,89].…”

Section: Summary and Perspectivementioning

confidence: 99%

Recent Advances in Electrocatalysts for Ammonia Oxidation Reaction

et al. 2023

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Ammonia (NH3) is a clean energy source that can either be directly used as fuel or a hydrogen carrier due to its high energy density and high hydrogen content. The NH3 electro-oxidation reaction (AOR) is the main reaction in both direct NH3 fuel cells and NH3 electrolysis. The AOR is thermodynamically favorable; however, the sluggish kinetics of the reaction can result in issues such as high overpotential, slow reaction rate, deactivation, etc. To overcome this, multiple strategies have been discussed to develop electrocatalysts that maintain a robust reaction rate in low overpotential regions. In this review, the fundamentals of AOR, including thermodynamics, kinetics, and experimental techniques, are studied. This review also focused on recent progress for catalyst modifications and their effects, with a particular focus on Pt- or Ni-based electrocatalysts. Additionally, vacant rooms needed to be developed was pointed, and a way to overcome the limitations was suggested. The fundamentals and efforts to prepare catalysts reviewed in this work will be effective in proposing and designing new robust electrocatalysts leading to advance AOR in practice.

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“…The introduction of Co enhanced the synergistic effect between Ni and Cu, resulting in a decrease in the potential required to generate the active species for the adsorption/ desorption of NH 3 and other intermediates. 29 Almomani 30 prepared a Co/Ni−C catalyst with a spherical (particle size ∼ 10−20 mm) and porous structure by a solvothermal method. At 20% Co concentration, the generated power and initial potential were higher as Co enhances the electrochemical polarization of ammonia.…”

Section: Introductionmentioning

confidence: 99%

“…66 In addition, Co is advantageous in the oxidation of Ni 2+ to Ni 3+ , resulting in good electrical conductivity and a fast electron-transfer rate. 26−28 A three-dimensional Ni 1 Cu 1 Co 0.5 -S-T/CP nanoflower-like structure was designed by Wang 29 as an electrocatalyst for the AOR. The introduction of Co enhanced the synergistic effect between Ni and Cu, resulting in a decrease in the potential required to generate the active species for the adsorption/ desorption of NH 3 and other intermediates.…”

Section: Introductionmentioning

confidence: 99%

“…A three-dimensional Ni 1 Cu 1 Co 0.5 -S-T/CP nanoflower-like structure was designed by Wang as an electrocatalyst for the AOR. The introduction of Co enhanced the synergistic effect between Ni and Cu, resulting in a decrease in the potential required to generate the active species for the adsorption/desorption of NH 3 and other intermediates . Almomani prepared a Co/Ni–C catalyst with a spherical (particle size ∼ 10–20 mm) and porous structure by a solvothermal method.…”

Section: Introductionmentioning

confidence: 99%

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Nickel–Cobalt Aerogel as a Highly Efficient Electrocatalyst for Dual Microfluidic Applications: Hydrogen Generation and Power Energy from Nitrogenous Compounds

Martínez-Lázaro,

Rodríguez-Buenrostro,

Rodríguez-Barajas

et al. 2024

Energy Fuels

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This research work presents a novel unsupported NiCo aerogel with high electrocatalytic activity, which was synthesized by an ultrafast method combining microwave heating and lyophilization. The novel aerogel was used as an electrocatalyst for the oxidation reactions of two different nitrogen compounds: urea and ammonium, with the aim of reducing the pollutant content in water and generating clean energy from the reduced hydrogen of oxidizing species. The NiCo aerogel was incorporated/evaluated in a microfluidic device in two ways: as an ammonium fuel cell and an alkaline urea electrolyzer, producing clean hydrogen in both systems. The unique physicochemical properties, particle size smaller than 0.1 nm, surface area of 52 m 2 g −1 , and the presence of NiCo metal alloys with the addition of species Ni−O, Ni−OH, and a higher percentage of Ni 2+ enable the effective oxidation of species in the alkaline medium. Hydrogen production and power densities of up 3 × 10 −4 μg s −1 and 0.74 mW cm −2 , respectively, are observed. This work demonstrates for the first time an aerogel structure of non-noble metal (NiCo) used in two different microfluidic devices that oxidize nitrogenous compounds such as urea and ammonium and produce clean fuel as hydrogen.

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Unique three-dimensional nanoflower-like NiCu electrodes constructed by Co, S co-doping for efficient ammonia oxidation reaction

Cited by 17 publications

References 50 publications

Recent Advances in Ammonia Electrolysis for Sustainable Hydrogen Generation

Recent Advances in Ammonia Electrolysis for Sustainable Hydrogen Generation

Recent Advances in Electrocatalysts for Ammonia Oxidation Reaction

Nickel–Cobalt Aerogel as a Highly Efficient Electrocatalyst for Dual Microfluidic Applications: Hydrogen Generation and Power Energy from Nitrogenous Compounds

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