Active bimetallic Fe–O–Co sites built on 2D trimetallic complex spinel oxides for industrially oxygen evolution electrocatalyst

Cheng, Zhenfeng; Yang, Haotian; Yang, Xu; Jiang, Jian; Xu, Qing

doi:10.1016/j.mtchem.2022.101214

Cited by 5 publications

(7 citation statements)

References 43 publications

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“…The two satellite peaks at 716.48 and 719.08 eV confirmed the existence of Fe 2+ and Fe 3+ , respectively. According to the OSPE values, Fe 2+ and Fe 3+ ions tended to be randomly distributed in octahedral and tetrahedral sites …”

Section: Resultsmentioning

confidence: 99%

“…X-ray photoelectron spectroscopy (XPS) was used to check the chemical bonding of the (NiCuMnCoZnFe) 3 O 4 HESO NFs, in which the molar ratio of the six cations was similar (Figure S19a,b). Figure S19c shows the three oxygen peaks at 530.2, 531.7, and 532.8 eV that represent lattice oxygen, defective oxygen, and adsorbed oxygen species, respectively . The ratio of vacancy oxygen to lattice oxygen was calculated as ∼0.38 .…”

Section: Resultsmentioning

confidence: 99%

“…According to the OSPE values, Fe 2+ and Fe 3+ ions tended to be randomly distributed in octahedral and tetrahedral sites. 19 Table S3 summarizes the detailed valence information on metal cations in the HESO NFs. The combination of OSPE theory and XPS spectra confirmed the cation distribution and provided support for the subsequent model establishment.…”

Section: Acs Nanomentioning

confidence: 99%

“…Figure S19c shows the three oxygen peaks at 530.2, 531.7, and 532.8 eV that represent lattice oxygen, defective oxygen, and adsorbed oxygen species, respectively. 19 The ratio of vacancy oxygen to lattice oxygen was calculated as ∼0.38. 20 Then, the electronic state of cations was studied using fine XPS spectroscopy, and the coordination state of elements was briefly analyzed.…”

Section: Synthesis Of Hollow Porousmentioning

confidence: 99%

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Low-Temperature Synthesis of Mesoporous Half-Metallic High-Entropy Spinel Oxide Nanofibers for Photocatalytic CO₂ Reduction

Zhang,

Xia,

Zhang

et al. 2024

ACS Nano

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High-entropy oxides (HEOs) exhibit great prospects owing to their varied composition, chemical adaptability, adjustable light-absorption ability, and strong stability. In this study, we report a strategy to synthesize a series of porous high-entropy spinel oxide (HESO) nanofibers (NFs) at a low temperature of 400 °C by a sol−gel electrospinning technique. The key lies in selecting six acetylacetonate salt precursors with similar coordination abilities, maintaining a high-entropy disordered state during the transformation from stable sols to gel NFs. The assynthesized HESO NFs of (NiCuMnCoZnFe) 3 O 4 show a high specific surface area of 66.48 m 2 /g, a diverse elemental composition, a dual bandgap, half-metallicity property, and abundant defects. The diverse elements provide various synergistic catalytic sites, and oxygen vacancies act as active sites for electron− hole separation, while the half-metallicity and dual-bandgap structure offer excellent light absorption ability, thus expanding its applicability to a wide range of photocatalytic processes. As a result, the HESO NFs can efficiently convert CO 2 into CH 4 and CO with high yields of 8.03 and 15.89 μmol g −1 h −1 , respectively, without using photosensitizers or sacrificial agents.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Acs Nanomentioning

confidence: 99%

Section: Synthesis Of Hollow Porousmentioning

confidence: 99%

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Low-Temperature Synthesis of Mesoporous Half-Metallic High-Entropy Spinel Oxide Nanofibers for Photocatalytic CO₂ Reduction

Zhang,

Xia,

Zhang

et al. 2024

ACS Nano

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“…The interest in high-entropy oxides as catalysts is that it is possible to engineer oxygen vacancies and disordered cation distribution, which is driven by competition between bond enthalpy and entropy of cation occupancy [277,280,[283][284][285]. The significance of oxygen vacancies (M-{#}-M) and the covalent nature of the M-O-M bonds have been reviewed previously in connection with perovskite piezocatalysts, black TiO 2 and microwave-plasmamodified black-BaTiO 3 .…”

Section: Significance Of Supported High-entropy Catalystsmentioning

confidence: 99%

Hydrogen, Ammonia and Symbiotic/Smart Fertilizer Production Using Renewable Feedstock and CO2 Utilization through Catalytic Processes and Nonthermal Plasma with Novel Catalysts and In Situ Reactive Separation: A Roadmap for Sustainable and Innovation-Based Technology

Akay

2023

Catalysts

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This multi-disciplinary paper aims to provide a roadmap for the development of an integrated, process-intensified technology for the production of H2, NH3 and NH3-based symbiotic/smart fertilizers (referred to as target products) from renewable feedstock with CO2 sequestration and utilization while addressing environmental issues relating to the emerging Food, Energy and Water shortages as a result of global warming. The paper also discloses several novel processes, reactors and catalysts. In addition to the process intensification character of the processes used and reactors designed in this study, they also deliver novel or superior products so as to lower both capital and processing costs. The critical elements of the proposed technology in the sustainable production of the target products are examined under three-sections: (1) Materials: They include natural or synthetic porous water absorbents for NH3 sequestration and symbiotic and smart fertilizers (S-fertilizers), synthesis of plasma interactive supported catalysts including supported piezoelectric catalysts, supported high-entropy catalysts, plasma generating-chemical looping and natural catalysts and catalysts based on quantum effects in plasma. Their performance in NH3 synthesis and CO2 conversion to CO as well as the direct conversion of syngas to NH3 and NH3—fertilizers are evaluated, and their mechanisms investigated. The plasma-generating chemical-looping catalysts (Catalysts, 2020, 10, 152; and 2016, 6, 80) were further modified to obtain a highly active piezoelectric catalyst with high levels of chemical and morphological heterogeneity. In particular, the mechanism of structure formation in the catalysts BaTi1−rMrO3−x−y{#}xNz and M3O4−x−y{#}xNz/Si = X was studied. Here, z = 2y/3, {#} represents an oxygen vacancy and M is a transition metal catalyst. (2) Intensified processes: They include, multi-oxidant (air, oxygen, CO2 and water) fueled catalytic biomass/waste gasification for the generation of hydrogen-enriched syngas (H2, CO, CO2, CH4, N2); plasma enhanced syngas cleaning with ca. 99% tar removal; direct syngas-to-NH3 based fertilizer conversion using catalytic plasma with CO2 sequestration and microwave energized packed bed flow reactors with in situ reactive separation; CO2 conversion to CO with BaTiO3−x{#}x or biochar to achieve in situ O2 sequestration leading to higher CO2 conversion, biochar upgrading for agricultural applications; NH3 sequestration with CO2 and urea synthesis. (3) Reactors: Several patented process-intensified novel reactors were described and utilized. They are all based on the Multi-Reaction Zone Reactor (M-RZR) concept and include, a multi-oxidant gasifier, syngas cleaning reactor, NH3 and fertilizer production reactors with in situ NH3 sequestration with mineral acids or CO2. The approach adopted for the design of the critical reactors is to use the critical materials (including natural catalysts and soil additives) in order to enhance intensified H2 and NH3 production. Ultimately, they become an essential part of the S-fertilizer system, providing efficient fertilizer use and enhanced crop yield, especially under water and nutrient stress. These critical processes and reactors are based on a process intensification philosophy where critical materials are utilized in the acceleration of the reactions including NH3 production and carbon dioxide reduction. When compared with the current NH3 production technology (Haber–Bosch process), the proposed technology achieves higher ammonia conversion at much lower temperatures and atmospheric pressure while eliminating the costly NH3 separation process through in situ reactive separation, which results in the production of S-fertilizers or H2 or urea precursor (ammonium carbamate). As such, the cost of NH3-based S-fertilizers can become competitive with small-scale distributed production platforms compared with the Haber–Bosch fertilizers.

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Review of Catalytic Electrodes Containing Iron‐Cobalt‐Nickel Composite Components for Water Electrolysis

Du,

Lv,

Yong Cao

et al. 2024

ChemPhysChem

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Transition metal‐based electrocatalytic materials for hydrogen production through water splitting offer advantages in terms of price and availability compared to noble metal‐based catalysts, among which, Fe‐, Co‐, and Ni‐based compounds are the most typical and widely studied materials. Utilizing the synergistic effects between composite components in compounds containing multiple metal elements is an important way to improve the catalytic performance of catalysts, so developing ternary or multiple active center catalysts containing Fe, Co, and Ni is a promising direction. In this mini‐review, we provide an summary of the latest achievements of water splitting catalyst materials simultaneously containing Fe, Co, and Ni elements. It was summarized according to several groups including compounds of boron‐/carbon‐/nitrogen‐/phosphorus‐/oxygen‐group elements, metal‐organic framework‐based compounds, and compounds in situ grown from alloy matrix. Also challenges that need to be addressed are presented at the end of the article.

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Active bimetallic Fe–O–Co sites built on 2D trimetallic complex spinel oxides for industrially oxygen evolution electrocatalyst

Cited by 5 publications

References 43 publications

Low-Temperature Synthesis of Mesoporous Half-Metallic High-Entropy Spinel Oxide Nanofibers for Photocatalytic CO₂ Reduction

Low-Temperature Synthesis of Mesoporous Half-Metallic High-Entropy Spinel Oxide Nanofibers for Photocatalytic CO₂ Reduction

Hydrogen, Ammonia and Symbiotic/Smart Fertilizer Production Using Renewable Feedstock and CO2 Utilization through Catalytic Processes and Nonthermal Plasma with Novel Catalysts and In Situ Reactive Separation: A Roadmap for Sustainable and Innovation-Based Technology

Review of Catalytic Electrodes Containing Iron‐Cobalt‐Nickel Composite Components for Water Electrolysis

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Active bimetallic Fe–O–Co sites built on 2D trimetallic complex spinel oxides for industrially oxygen evolution electrocatalyst

Cited by 5 publications

References 43 publications

Low-Temperature Synthesis of Mesoporous Half-Metallic High-Entropy Spinel Oxide Nanofibers for Photocatalytic CO2 Reduction

Low-Temperature Synthesis of Mesoporous Half-Metallic High-Entropy Spinel Oxide Nanofibers for Photocatalytic CO2 Reduction

Hydrogen, Ammonia and Symbiotic/Smart Fertilizer Production Using Renewable Feedstock and CO2 Utilization through Catalytic Processes and Nonthermal Plasma with Novel Catalysts and In Situ Reactive Separation: A Roadmap for Sustainable and Innovation-Based Technology

Review of Catalytic Electrodes Containing Iron‐Cobalt‐Nickel Composite Components for Water Electrolysis

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Low-Temperature Synthesis of Mesoporous Half-Metallic High-Entropy Spinel Oxide Nanofibers for Photocatalytic CO₂ Reduction

Low-Temperature Synthesis of Mesoporous Half-Metallic High-Entropy Spinel Oxide Nanofibers for Photocatalytic CO₂ Reduction