High catalytic performance of CuCo/nickel foam electrode for ammonia electrooxidation

Tsai, Ming Han; Chen, Tzu Chiang; Juang, Yaju; Hua, Lap Cuong; Huang, Chihpin

doi:10.1016/j.elecom.2020.106875

Cited by 34 publications

(18 citation statements)

References 16 publications

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“…When pH = 12, however, the weaker reduction of NO 3 − and the medium water oxidation activity led to the higher yield of NO 3 − . Surprisingly, the production of byproducts was dramatically suppressed (to <15%) compared to previous reports (∼50%), 14,15 and the three-electron-transfer pathway coupled with flow-through operation mitigate mass transport limitations, suggesting the superiority of the reaction system.…”

Section: Methodscontrasting

confidence: 71%

“…The selective conversion of ammonia to nitrogen at high-valence metal sites without formation of intermediates would be a green and energy-efficient strategy. Previous reports based on electrocatalytic ammonia oxidation via three-electron transfer showed relatively high byproduct yield at medium-concentration ammonia (∼50%). , Achieving the direct transformation from NH 3 to N 2 is of paramount importance for electrode and reactor design.…”

Section: Introductionmentioning

confidence: 99%

“…The immersed flat electrode reactor is restricted by limited active site exposure and long mass-transfer distance (Figure a), leading to poor reaction efficiency. Nickel foam (NF) with an open macropore structure of 200–500 μm pores and relatively high mechanical strength can act as a suitable porous electrode skeleton for the electrochemical oxidation of ammonia. , When a NF framework is coupled with a flow-through operation mode (Figure b), the porous electrodes with microscale diffusion distance compel the solution to penetrate the microfluidic channels and enhance the macroscopic mass transfer. Furthermore, two-dimensional (2D) nanosheets, with the characteristics of considerable specific surface area and high exposure of edges/surfaces, are regarded as ideal reaction interfaces .…”

Section: Introductionmentioning

confidence: 99%

“…Previous reports based on electrocatalytic ammonia oxidation via three-electron transfer showed relatively high byproduct yield at medium-concentration ammonia (∼50%). 14,15 Achieving the direct transformation from NH 3 to N 2 is of paramount importance for electrode and reactor design.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Optimization of a Hierarchical Porous-Structured Reactor to Mitigate Mass Transport Limitations for Efficient Electrocatalytic Ammonia Oxidation through a Three-Electron-Transfer Pathway

Liu

Zhang

Lan

et al. 2021

Environ. Sci. Technol.

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Regulation of fast three-electron-transfer processes for electrocatalytic oxidation of ammonia to nitrogen by achieving efficient generation and utilization of active sites is the optimal strategy in ammonia-containing wastewater treatment. However, the limited number of accessible active sites and sluggish interfacial mass transfer are two main bottlenecks restricting conventional ammonia oxidation configurations. Herein, we develop a macroporous Ni foam electrode integrated with vertically aligned two-dimensional mesoporous Ni2P nanosheets to create sufficient exposure of active centers. A novel ammonia oxidation reactor with the developed hierarchical porous-structured electrodes was assembled to construct an intensified microfluidic process with flow-through operation to mitigate macroscopic mass transport limitations. The confined microreaction space in the hierarchical porous reactor further promotes spontaneous nanoscale diffusion/convection of the target contaminant to high-valence Ni sites and enhances the microscopic mass transfer. The combined results of electrochemical measurements and in situ Raman spectra showed that the ammonia degradation mechanism results from direct oxidation by the high-valence Ni, significantly different from the conventional indirect active-chlorine-species-mediated oxidation. The optimized reactor achieves high-efficiency three-electron-transfer ammonia conversion with an ammonia removal efficiency of ∼70% from an initial concentration of ∼1400 mg/L and byproduct production of ∼4%, significantly superior to a conversion unit comprising a featureless Ni-based electrode in the immersed configuration, which had >50% byproduct yield. 20 days of continuous operation under variable conditions achieved >90% ammonia degradation performance and an energy consumption of 25.42 kW h kg–1 N (1 order of magnitude lower than the active-chlorine-mediated process), showing the potential of the reactor in medium-concentration ammonia-containing wastewater treatment.

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Section: Methodscontrasting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Optimization of a Hierarchical Porous-Structured Reactor to Mitigate Mass Transport Limitations for Efficient Electrocatalytic Ammonia Oxidation through a Three-Electron-Transfer Pathway

Liu

Zhang

Lan

et al. 2021

Environ. Sci. Technol.

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“…Recently, Nagita et al [92] In combination with Ni and Cu, another element such as cobalt (Co) has been explored to achieve high N 2 selectivity because most of NiCu studies derive oxygen-containing nitrogen species (NO 2 − and NO 3 − ) as major products except for NiCu/ MnO 2 [92]. Co can be one of the candidates to overcome the limited N 2 selectivity of NiCu bimetal since it strongly bonds to N but weakly bonds to hydrazine, which is a possible intermediate for N 2 formation [93]. Recently, Shih et al [94] ), which is attributed to the synergistic effect of fewer electrons transferred and high surface reactivity in [97,98].…”

Section: Ni-based Alloy Catalysts Toward N 2 Productionmentioning

confidence: 99%

Catalysts for electrochemical ammonia oxidation: Trend, challenge, and promise

Lee

Jang

2022

Sci. China Mater.

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Developing sustainable and clean energy technology is critial to address the current energy and environmental crisis. As an energy carrier, hydrogen has been getting attention due to its abundance, high energy density, and zero carbon emission. Due to the difficulty of hydrogen storage and transport, the electro-oxidation of ammonia shows great potential for renewable energy since it satisfies both energy supply and environmental protection as a carbon-free fuel with high hydrogen content. However, ammonia electro-oxidation is a sluggish reaction and shows low durability. Understanding the complicated mechanism and intermediates is conducive to developing efficient electrocatalysts with high catalytic activity and durability. This review begins with the ammonia oxidation technologies and their principles. The two typical mechanisms for ammonia electro-oxidation, Oswin-Salomon mechanism and Gerischer-Mauerer mechanism, are discussed, and attention to the poisoning species is included. Then, the electrocatalysts for ammonia reaction are classified into Pt-based catalysts and non-noble metal-based catalysts, and their performances are reviewed with various strategies. Based on the progress on the electrochemical ammonia oxidation catalysts, the challenges and future insight on ammonia oxidation reaction are discussed and proposed.

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Electrocatalytic Ammonia Oxidation to Nitrite and Nitrate with NiOOH‐Ni

Liu,

Yang,

Dong

et al. 2024

Advanced Energy Materials

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Ammonia electrooxidation in aqueous solutions can be a highly energy‐efficient process in producing nitrate and nitrite while generating hydrogen under ambient conditions. However, the kinetics of this reaction are slow and the role of catalyst in facilitating ammonia electrooxidation is not well understood. In this study, a high‐performance NiOOH‐Ni catalyst is introduced for converting ammonia into nitrite with Faraday efficiency of up to 90.4% and nitrate production rate of 1 mg h−1 cm−2. By employing Operando techniques, the role of NiOOH catalyst is elucidated in the dynamic electrooxidation of ammonia. Density functional theory (DFT) calculations support experimental observations and reveal the mechanism of the electrochemical oxidation of ammonia to nitrite and nitrate. Overall, this research contributes to the development of a cost‐effective and highly efficient catalyst for large‐scale ammonia electrolysis, while shedding light on the underlying mechanism of the NiOOH catalyst in ammonia electrooxidation.

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High catalytic performance of CuCo/nickel foam electrode for ammonia electrooxidation

Cited by 34 publications

References 16 publications

Optimization of a Hierarchical Porous-Structured Reactor to Mitigate Mass Transport Limitations for Efficient Electrocatalytic Ammonia Oxidation through a Three-Electron-Transfer Pathway

Optimization of a Hierarchical Porous-Structured Reactor to Mitigate Mass Transport Limitations for Efficient Electrocatalytic Ammonia Oxidation through a Three-Electron-Transfer Pathway

Catalysts for electrochemical ammonia oxidation: Trend, challenge, and promise

Electrocatalytic Ammonia Oxidation to Nitrite and Nitrate with NiOOH‐Ni

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