Minireview on the Electrocatalytic Ammonia Oxidation Reaction for Hydrogen Production and Sewage Treatment

Liu, Hanwen; Xu, Xiaomin; Guan, Daqin; Shao, Zongping

doi:10.1021/acs.energyfuels.3c04452

Cited by 11 publications

(1 citation statement)

References 78 publications

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“…This dual benefit renders the electrochemical oxidation of ammonia to be an appealing strategy in the broader context of sustainable energy and environmental conservation. The overall reaction is defined as follows [8,9]:…”

Section: Introductionmentioning

confidence: 99%

The Enhanced Performance of NiCuOOH/NiCu(OH)2 Electrode Using Pre-Conversion Treatment for the Electrochemical Oxidation of Ammonia

Yin,

Wen,

Zhao

et al. 2024

Molecules

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Electrochemical oxidation of ammonia is an attractive process for wastewater treatment, hydrogen production, and ammonia fuel cells. However, the sluggish kinetics of the anode reaction has limited its applications, leading to a high demand for novel electrocatalysts. Herein, the electrode with the in situ growth of NiCu(OH)2 was partially transformed into the NiCuOOH phase by a pre-treatment using highly oxidative solutions. As revealed by SEM, XPS, and electrochemical analysis, such a strategy maintained the 3D structure, while inducing more active sites before the in situ generation of oxyhydroxide sites during the electrochemical reaction. The optimized NiCuOOH-1 sample exhibited the current density of 6.06 mA cm−2 at 0.5 V, which is 1.67 times higher than that of NiCu(OH)2 (3.63 mA cm−2). Moreover, the sample with a higher crystalline degree of the NiCuOOH phase exhibited lower performance, demonstrating the importance of a moderate treatment condition. In addition, the NiCuOOH-1 sample presented low selectivity (<20%) towards NO2− and stable activity during the long-term operation. The findings of this study would provide valuable insights into the development of transition metal electrocatalysts for ammonia oxidation.

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Section: Introductionmentioning

confidence: 99%

The Enhanced Performance of NiCuOOH/NiCu(OH)2 Electrode Using Pre-Conversion Treatment for the Electrochemical Oxidation of Ammonia

Yin,

Wen,

Zhao

et al. 2024

Molecules

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Isolated Rhodium Atoms Activate Porous TiO₂ for Enhanced Electrocatalytic Conversion of Nitrate to Ammonia

Zhao,

Yang,

Wang

et al. 2024

Advanced Science

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The direct electrochemical reduction of nitrate to ammonia is an efficient and environmentally friendly technology, however, developing electrocatalysts with high activity and selectivity remains a great challenge. Single‐atom catalysts demonstrate unique properties and exceptional performance across a range of catalytic reactions, especially those that encompass multi‐step processes. Herein, a straightforward and cost‐effective approach is introduced for synthesizing single‐atom dispersed Rh on porous TiO2 spheres (Rh1‐TiO2), which functions as an efficient electrocatalyst for the electroreduction of NO3− to NH3. The synthesized Rh1‐TiO2 catalyst achieve a maximum NH3 Faradaic efficiency (FE) of 94.7% and an NH3 yield rate of 29.98 mg h−1 mgcat−1 at −0.5 V versus RHE in a 0.1 M KOH+0.1 M KNO3 electrolyte, significantly outperforming not only undoped TiO2 but also Ru, Pd, and Ir single‐atom doped titania catalysts. Density functional theory calculations reveal that the incorporation of Rh single atom significantly enhances charge transfer between adsorbed NO3− and the active site. The Rh atoms not only serve as the highly active site for electrochemical nitrate reduction reaction (NO3RR), but also activates the adjacent Ti sites through optimizating the electronic structure, thereby reducing the energy barrier of the rate‐limiting step. Consequently, this results in a substantial enhancement in electrochemical NO3RR performance. Furthermore, this synthetic method has the potential to be extended to other single‐atom catalysts and scaled up for commercial applications.

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Electrochemical Oxidation of Small Molecules for Energy‐Saving Hydrogen Production

Sun,

Xu,

Fei

et al. 2024

Advanced Energy Materials

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Electrochemical water splitting is a promising technique for the production of high‐purity hydrogen. Substituting the slow anodic oxygen evolution reaction with an oxidation reaction that is thermodynamically more favorable enables the energy‐efficient production of hydrogen. Moreover, this approach facilitates the degradation of environmental pollutants and synthesis of value‐added chemicals through the rational selection of small molecules as substrates. Strategies for small‐molecule selection and electrocatalyst design are critical to electrocatalytic performance, with a focus on achieving a high current density, selectivity, Faradaic efficiency, and operational durability. This perspective discusses the key factors required for further advancement, including technoeconomic analysis, new reactor system design, meeting the requirements of industrial applications, bridging the gap between fundamental research and practical applications, and product detection and separation. This perspective aims to advance the development of hybrid water electrolysis applications.

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Minireview on the Electrocatalytic Ammonia Oxidation Reaction for Hydrogen Production and Sewage Treatment

Cited by 11 publications

References 78 publications

The Enhanced Performance of NiCuOOH/NiCu(OH)2 Electrode Using Pre-Conversion Treatment for the Electrochemical Oxidation of Ammonia

The Enhanced Performance of NiCuOOH/NiCu(OH)2 Electrode Using Pre-Conversion Treatment for the Electrochemical Oxidation of Ammonia

Isolated Rhodium Atoms Activate Porous TiO₂ for Enhanced Electrocatalytic Conversion of Nitrate to Ammonia

Electrochemical Oxidation of Small Molecules for Energy‐Saving Hydrogen Production

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Minireview on the Electrocatalytic Ammonia Oxidation Reaction for Hydrogen Production and Sewage Treatment

Cited by 11 publications

References 78 publications

The Enhanced Performance of NiCuOOH/NiCu(OH)2 Electrode Using Pre-Conversion Treatment for the Electrochemical Oxidation of Ammonia

The Enhanced Performance of NiCuOOH/NiCu(OH)2 Electrode Using Pre-Conversion Treatment for the Electrochemical Oxidation of Ammonia

Isolated Rhodium Atoms Activate Porous TiO2 for Enhanced Electrocatalytic Conversion of Nitrate to Ammonia

Electrochemical Oxidation of Small Molecules for Energy‐Saving Hydrogen Production

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Isolated Rhodium Atoms Activate Porous TiO₂ for Enhanced Electrocatalytic Conversion of Nitrate to Ammonia