Highly efficient CO<sub>x</sub>-free hydrogen evolution activity on rod Fe<sub>2</sub>N catalysts for ammonia decomposition

Lei, Bowen; Wen, Jie; Ren, Shan; Zhang, Lianhong; Zhang, Hui

doi:10.1039/c9nj04273c

Cited by 7 publications

(10 citation statements)

References 44 publications

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“…In comparison, two structures of Fe-N-O-GC-350 had much higher adsorption energy for PMS achieving 3.92 and 4.47 eV (Table S4), respectively, demonstrating that Fe 2 N enhanced the adsorption of PMS. It is noted that the main exposure facet of Fe 2 N in this study was (0 1 2) as evidenced above, which is different from that (1 0 1) reported in the previous study. , Different exposure facets could affect the catalytic activity of catalysts . Thus, the adsorption energy of different facets of Fe 2 N to PMS was also evaluated.…”

Section: Resultsmentioning

confidence: 56%

“…However, no significant change was found for the ratio of I D to I G before and after use, indicating that the contribution of defects to PMS activation could be neglected. In addition, two significant peaks were observed at the range of 450–580 cm –1 , suggesting the formation of Fe–O that was due to the surface oxidation of Fe 2 N and SA-Fe. , Based on the above analysis, Fe 2 N, SA-Fe, nitrogen species, and C–O acted as the potential active sites during the process of PMS activation in which iron species were the main active sites.…”

Section: Resultsmentioning

confidence: 83%

“…In addition, two significant peaks were observed at the range of 450−580 cm −1 , suggesting the formation of Fe−O that was due to the surface oxidation of Fe 2 N and SA-Fe. 24,57 Based on the above analysis, Fe 2 N, SA-Fe, nitrogen species, and C−O acted as the potential active sites during the process of PMS activation in which iron species were the main active sites.…”

Section: Resultsmentioning

confidence: 99%

“…The lattice spacing of 0.21 and 0.162 nm occurred on the edge corresponding to the (0 1 2) and (0 1 1) facets of Fe 2 N. The size of Fe 2 N was about 5 nm that was lower than that reported in previous studies. 24,25 For Fe-N-O-GC-700, more carbon layers and less lattice fringes were found. Moreover, lattice fringes did not occur on the edge.…”

Section: Resultsmentioning

confidence: 99%

“…It is noted that the main exposure facet of Fe 2 N in this study was (0 1 2) as evidenced above, which is different from that (1 0 1) reported in the previous study. 24,60 Different exposure facets could affect the catalytic activity of catalysts. 61 Thus, the adsorption energy of different facets of Fe 2 N to PMS was also evaluated.…”

Section: Resultsmentioning

confidence: 99%

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Iron-Based Dual Active Site-Mediated Peroxymonosulfate Activation for the Degradation of Emerging Organic Pollutants

Wang

2021

Environ. Sci. Technol.

123

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It is still a challenge to synthesize highly efficient and stable catalysts for the Fenton-like reaction. In this study, we constructed an integrated catalyst with highly dispersed iron-based dual active sites, in which Fe2N and single-atom Fe (SA-Fe) were embedded into nitrogen- and oxygen-co-doped graphitic carbon (Fe-N-O-GC-350). Extended X-ray absorption fine structure (EXAFS) confirmed the coordination structure of iron, and line combination fitting (LCF) demonstrated the coexistence of Fe2N and SA-Fe with percentages of 75 and 25%, respectively. Iron-based dual active sites endowed Fe-N-O-GC-350 with superior catalytic activity to activate peroxymonosulfate (PMS) as evidenced by the fast degradation rate of sulfamethoxazole (SMX) (0.24 min–1) in the presence of 0.4 mM PMS and 0.1 g/L Fe-N-O-GC-350. Unlike the reported singlet oxygen and high-valent iron oxo-mediated degradation induced by the SA-Fe catalyst, both surface-bound reactive species and singlet oxygen contributed to SMX degradation, while surface-bound reactive species dominated. Density functional theory (DFT) simulation indicated that Fe2N and SA-Fe enhanced the adsorption of PMS, which played a key role in PMS activation. The Fe-N-O-GC-350/PMS system had resistance to the interference of common inorganic anions and high oxidation capacity to recalcitrant organic contaminants. This study elucidated the important role of Fe2N in PMS activation and provide a clue to design rationally catalysts with iron-based dual active sites to activate PMS for the degradation of emerging organic pollutants.

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Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 83%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

Iron-Based Dual Active Site-Mediated Peroxymonosulfate Activation for the Degradation of Emerging Organic Pollutants

Wang

2021

Environ. Sci. Technol.

123

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Revealing An Intercalation‐Conversion‐Heterogeneity Hybrid Lithium‐Ion Storage Mechanism in Transition Metal Nitrides Electrodes with Jointly Fast Charging Capability and High Energy Output

Zhao

et al. 2022

Advanced Science

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The performance of electrode materials depends intensively on the lithium (Li)-ion storage mechanisms correlating ultimately with the Coulombic efficiency, reversible capacity, and morphology variation of electrode material upon cycling. Transition metal nitrides anode materials have exhibited high-energy density and superior rate capability; however, the intrinsic mechanism is largely unexplored and still unclear. Here, a typical 3D porous Fe 2 N micro-coral anode is prepared and, an intercalation-conversion-heterogeneity hybrid Li-ion storage mechanism that is beyond the conventional intercalation or conversion reaction is revealed through various characterization techniques and thermodynamic analysis. Interestingly, using advanced in situ magnetometry, the ratio (ca. 24.4%) of the part where conversion reaction occurs to the entire Fe 2 N can further be quantified. By rationally constructing a Li-ion capacitor comprising 3D porous Fe 2 N micro-corals anode and commercial AC cathode, the hybrid full device delivers a high energy-density (157 Wh kg −1 ) and high power-density (20 000 W kg −1 ), as well as outstanding cycling stability (93.5% capacitance retention after 5000 cycles). This research provides an original and insightful method to confirm the reaction mechanism of material related to transition metals and a fundamental basis for emerging fast charging electrode materials to be efficiently explored for a next-generation battery.

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Ammonia decomposition over iron-based catalyst: Exploring the hidden active phase

Lü

Ren

et al. 2022

Applied Catalysis B: Environmental

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Highly efficient CO_x-free hydrogen evolution activity on rod Fe₂N catalysts for ammonia decomposition

Abstract: The morphology of Fe2O3 precursors had a significant effect on the Fe2N catalyst crystallite size, components and activity.

Cited by 7 publications

References 44 publications

Iron-Based Dual Active Site-Mediated Peroxymonosulfate Activation for the Degradation of Emerging Organic Pollutants

Iron-Based Dual Active Site-Mediated Peroxymonosulfate Activation for the Degradation of Emerging Organic Pollutants

Revealing An Intercalation‐Conversion‐Heterogeneity Hybrid Lithium‐Ion Storage Mechanism in Transition Metal Nitrides Electrodes with Jointly Fast Charging Capability and High Energy Output

Ammonia decomposition over iron-based catalyst: Exploring the hidden active phase

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Highly efficient COx-free hydrogen evolution activity on rod Fe2N catalysts for ammonia decomposition

Abstract: The morphology of Fe2O3 precursors had a significant effect on the Fe2N catalyst crystallite size, components and activity.

Cited by 7 publications

References 44 publications

Iron-Based Dual Active Site-Mediated Peroxymonosulfate Activation for the Degradation of Emerging Organic Pollutants

Iron-Based Dual Active Site-Mediated Peroxymonosulfate Activation for the Degradation of Emerging Organic Pollutants

Revealing An Intercalation‐Conversion‐Heterogeneity Hybrid Lithium‐Ion Storage Mechanism in Transition Metal Nitrides Electrodes with Jointly Fast Charging Capability and High Energy Output

Ammonia decomposition over iron-based catalyst: Exploring the hidden active phase

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Highly efficient CO_x-free hydrogen evolution activity on rod Fe₂N catalysts for ammonia decomposition