Hyperbranched concave octahedron of PtIrCu nanocrystals with high-index facets for efficiently electrochemical ammonia oxidation reaction

Xu, Lin; Zhang, Xiaoran; Wang, Zhen; Zhu, Xinxin; Zhu, Jinhui; Chen, Pinsong; Lyu, Taiyu; Li, Changzheng; Tian, Zhi Qun; Shen, Pei Kang

doi:10.1016/j.jcis.2021.04.068

Cited by 31 publications

(8 citation statements)

References 62 publications

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“…Its high mass activity of 40.6 A g −1 at 0.5 V versus RHE is 10.3 times higher than that of commercial Pt/C ( Figure a). [ 83 ] Another work from Liu et al synthesized Pt‐decorated and flower‐like Ni particles that have a highly porous structure, exhibiting a high mass activity of 75.32 mA mg −1 , which is twofold higher than commercial Pt/C catalysts (Figure 9b,c). [ 23 ] Another Cu–Pt bimetallic alloy fiber with less than 3 wt% Pt was deposited on carbon filaments, which also showed a superior electrocatalytic performance to pure Pt.…”

Section: Electrocatalysts For the Aormentioning

confidence: 99%

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Green Chemistry: Advanced Electrocatalysts and System Design for Ammonia Oxidation

et al. 2023

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Fossil fuels, including coal, petroleum, and natural gas, are still the main sources of energy supply in the world at present. [1,2] Their nonrenewable nature, however, determines that the total amount of these fossil fuels is limited, thus leading to the potential energy crisis. [3,4] This issue has given a strong impetus to the development of green, safe, and renewable energy supplies, such as wind, solar, and tide energy. [5][6][7][8] Although these novel energy sources are generally sustainable, their direct utilization is extremely difficult. For example, these green energy types, especially solar energy, commonly suffer high fluctuation, thus leading to the misalignment of electricity generation of these energies with the actual demand. [9] Therefore, it is very important to explore and exploit the optimal secondary energy carriers. Among the secondary energy carriers, hydrogen is one of the most economical and eco-friendly carriers due to its zero-carbon emission, abundance, high energy density (120 MJ kg À1 ), etc. [10][11][12] Due to the potential safety hazards in the storage and transportation of hydrogen gas, nevertheless, its practical utilization has great limitations. [13,14] To address these issues, it has been suggested to use methane or ammonia gas as the hydrogen carriers. [15][16][17][18] Methane has a wide range of resources and mature industrial processing technologies. Thermal catalytic decomposition of methane and steam reforming is the most mature technology of hydrogen generation in the industry currently. [19,20] However, the transportation and storage of methane remain problematic owing to its physical characteristics, which are similar to those of hydrogen. As a cost-effective hydrogen carrier, ammonia can turn into a liquid state at room temperature under moderate pressure (%8 bar), much milder than that hydrogen gas (690 bar and 15 °C). [10,21,22] Besides, the utilization of ammonia does not associate with greenhouse gas emissions. Moreover, the energy density of liquid ammonia (11.5 MJ kg À1 ) is also higher than that of liquid hydrogen (8.5 MJ kg À1 ). Moreover, the presence of ammonia can be easily detected even at a very low concentration of 1 ppm, allowing ammonia leaks to be assessed and dealt with in a timely manner. In addition, unlike hydrogen, ammonia is widely used and vastly produced (global production is 176 million tons a year) around the world in the pharmaceutical, fertilizer, and chemical industries. Consequently, the well-established and mature ammonia production-related infrastructure makes ammonia a viable energy source. [23][24][25][26] To utilize ammonia for energy applications, electrochemical ammonia oxidation reaction (AOR) is essential, either for hydrogen production via ammonia splitting or electricity generation via direct ammonia fuel cells (DAFCs), which are highly commercially promising. During operation, DAFCs just produce water and nitrogen gas. [22,[27][28][29] In addition, ammonia fuel cells are also theoretically superior to their hydrogen-based c...

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Section: Electrocatalysts For the Aormentioning

confidence: 99%

Section: Electrocatalysts For the Aormentioning

confidence: 99%

Green Chemistry: Advanced Electrocatalysts and System Design for Ammonia Oxidation

et al. 2023

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“…Metals with high-index facets can also be efficient electrocatalysts because of their highenergy surface and abundant suspended bonds. Lin et al [56] reported the hyperbranched concave octahedral nanodendrites of PtIrCu catalysts (PtIrCu HCONDs) with high-index facets of {553}, {331} and {221} for eAOR. The PtIrCu HCOND particles were synthesized by solvothermal methods for the first time.…”

Section: Facet-controlled Pt-based Catalystsmentioning

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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Section: Introductionmentioning

confidence: 99%

“…However, the high adsorption energy also tends to lead to toxicity, which may explain the frequent occurrence of copper as a dopant metal in known reports and may also explain the lack of catalytic activity of copper towards AOR in actual experiments. [26][27][28][29] Therefore, based our previous research, 30 we used copper phthalocyanine as a catalyst for AOR. Phthalocyanines (Pcs), consisting of four indole substituents with 18 p-electrons, are synthetic analogues of naturally occurring porphyrins and have received much attention in other areas due to their good results in biocatalytic reactions, and it is hoped that their Cu-N 4 structure will enable copper-catalyzed AOR with its theoretically high catalytic activity.…”

Section: Introductionmentioning

confidence: 99%

Cu–N₄ in copper phthalocyanine@CFC catalyst for ammonia oxidation reaction catalysis

Liu

2023

Phys. Chem. Chem. Phys.

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Hyperbranched concave octahedron of PtIrCu nanocrystals with high-index facets for efficiently electrochemical ammonia oxidation reaction

Cited by 31 publications

References 62 publications

Green Chemistry: Advanced Electrocatalysts and System Design for Ammonia Oxidation

Green Chemistry: Advanced Electrocatalysts and System Design for Ammonia Oxidation

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

Cu–N₄ in copper phthalocyanine@CFC catalyst for ammonia oxidation reaction catalysis

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Hyperbranched concave octahedron of PtIrCu nanocrystals with high-index facets for efficiently electrochemical ammonia oxidation reaction

Cited by 31 publications

References 62 publications

Green Chemistry: Advanced Electrocatalysts and System Design for Ammonia Oxidation

Green Chemistry: Advanced Electrocatalysts and System Design for Ammonia Oxidation

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

Cu–N4 in copper phthalocyanine@CFC catalyst for ammonia oxidation reaction catalysis

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Product

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Cu–N₄ in copper phthalocyanine@CFC catalyst for ammonia oxidation reaction catalysis