Significantly enhanced oxygen reduction activity of Cu/CuN x C y co-decorated ketjenblack catalyst for Al–air batteries

Li, Fuzhi; Li, Jingsha; Feng, Quan; Yan, Jun; Tang, Yougen; Wang, Haiyan

doi:10.1016/j.jechem.2017.12.002

Cited by 44 publications

(14 citation statements)

References 74 publications

(138 reference statements)

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“…Both CoFeO x -A and CoFeO x -N exhibit a small peak centered at ≈2.4 nm, while a distinct peak at ≈5.00 nm is observed for CoFeO x -H. In this regard, CoFeO x -H endows abundant electroactive sites and desired mesoporous structure, which would facilitate the access of electrolytes and fast mass transfer for OER reactions. [41][42][43] The high resolution (HR)-TEM results are in accordance with the XRD patterns (Figure 1b). The lattice fringes of CoFeO x -A with interplanar spacings of 0.202 and 0.467 nm can be assigned to the (400) and (111) planes of Co 3 O 4 and Fe 3 O 4 (Figure 4d), respectively.…”

Section: Study Of Structure and Morphologysupporting

confidence: 78%

Defect‐Induced Atomic Arrangement in CoFe Bimetallic Heterostructures with Boosted Oxygen Evolution Activity

Zheng

Zhao

et al. 2022

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6 e g 1 ) and Jahn-Teller active Mn 3+ (t 2g 3 e g 1) species enabled the promotion of O-O bond formation and thereby leading to excellent OER activity. Zhang et. al. [17] suitably engineered the low-coordination atoms in NiO/ Co 3 O 4 heterointerfaces and achieved boosting electrocatalysts. Liu et. al. [18] induced in-plane CoO@Co 3 O 4 rocksalt@spinel heterophase, which delivered drastically improved OER activity. These achievements verify that the electrochemical ability of Three CoFe-bimetallic oxides with different compositions (termed as CoFeO x -A/N/H) are prepared by thermally treating metal-organic-framework (MOF) precursors under different atmospheres (air, N 2, and NaBH 4 /N 2 ), respectively. With the aid of vast oxygen vacancies (O v ), cobalt at tetrahedral sites (Co 2+ (Th)) in spinel Co 3 O 4 is diffused into interstitial octahedral sites (Oh) to form rocksalt CoO and ternary oxide CoFe 2 O 4 has been induced to give the unique defective CoO/CoFe 2 O 4 heterostructure. The resultant CoFeO x -H exhibits superb electrocatalytic activity toward water oxidation: overpotential at 10 mA cm −2 is 192 mV, which is 122 mV smaller than that of CoFeO x -A. The smaller Tafel slope (42.53 mV dec −1 ) and higher turnover frequency (785.5 h −1 ) suggest fast reaction kinetics. X-ray absorption spectroscopy, ex situ characterizations, and theoretical calculations reveal that defect engineering effectively tunes the electronic configuration to a more active state, resulting in the greatly decreased binding energy of oxo intermediates, and consequently much lower catalytic overpotential. Moreover, the construction of hetero-interface in CoFeO x -H can provide rich active sites and promote efficient electron transfer. This work may shed light on a comprehensive understanding of the modulation of electron configuration of bimetallic oxides and inspire the smart design of high-performance electrocatalysts.

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Section: Study Of Structure and Morphologysupporting

confidence: 78%

Defect‐Induced Atomic Arrangement in CoFe Bimetallic Heterostructures with Boosted Oxygen Evolution Activity

Zheng

Zhao

et al. 2022

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“…Moreover, there are differences in the binding energy of the divided N 1s and Mo 3d peaks (Figure S1). − Compared to Mo 2 N MRs, Pt/Mo 2 N MRs displayed a slightly positive shift in the binding energy of metal–N, further indicating the electronic effect of Pt on N in Mo 2 N MRs (Figure S1a,b). , Moreover, after loading Pt NPs, the binding energy and intensity of Mo 3d peaks in Pt/Mo 2 N MRs were changed, supporting that Pt NPs also affected the electronic structure of Mo .…”

Section: Resultsmentioning

confidence: 95%

Robust Oxygen Reduction Electrocatalysis Enabled by Platinum Rooted on Molybdenum Nitride Microrods

Zhang

Huang

et al. 2022

Inorg. Chem.

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Robust oxygen reduction electrocatalysis is central to renewable fuel cells and metal− air batteries. Herein, Pt nanoparticles (NPs) rooted on porous molybdenum nitride microrods (Pt/ Mo 2 N MRs) are rationally constructed toward the oxygen reduction reaction (ORR). Owing to the desired composition with strong electronic metal−support interactions (EMSIs) and a porous onedimensional structure supporting ultrafine NPs, the developed Pt/Mo 2 N MRs possess much higher ORR mass and specific activities than commercial Pt/C. In situ Raman and density functional theory calculations reveal that the EMSI weakens the adsorption of intermediates over Pt/Mo 2 N MRs via an associative mechanism. Moreover, the porous Mo 2 N support stabilizes these high activities. Impressively, a homemade zinc−air battery driven by Pt/Mo 2 N MRs delivers excellent performance including a peak power density of 167 mW cm −2 and a high rate capability that ranged from 5 to 50 mA cm −2 . This work highlights the role of EMSI in promoting robust ORR electrocatalysis, thus providing a promising approach for efficient and robust cathode materials for advanced metal−air batteries.

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“…Compared with the noble metal-based catalysts, transition metal-based catalysts (such as Fe, Co, Ni, and Cu) have aroused interest due to their earth-abundant and tunable electronic structure of the central transition metal atoms [81][82][83][84]. Transition metal-based materials, including metal complexes, metal compounds, and transition nitrogendoped carbon materials, have been reported as efficient electrocatalysts for O 2 reduction to H 2 O 2 [85][86][87].…”

Section: Transition Metal-based Catalystsmentioning

confidence: 99%

Recent Advances of Electrocatalyst and Cell Design for Hydrogen Peroxide Production

et al. 2023

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Electrochemical synthesis of H2O2 via a selective two-electron oxygen reduction reaction has emerged as an attractive alternative to the current energy-consuming anthraquinone process. Herein, the progress on electrocatalysts for H2O2 generation, including noble metal, transition metal-based, and carbon-based materials, is summarized. At first, the design strategies employed to obtain electrocatalysts with high electroactivity and high selectivity are highlighted. Then, the critical roles of the geometry of the electrodes and the type of reactor in striking a balance to boost the H2O2 selectivity and reaction rate are systematically discussed. After that, a potential strategy to combine the complementary properties of the catalysts and the reactor for optimal selectivity and overall yield is illustrated. Finally, the remaining challenges and promising opportunities for high-efficient H2O2 electrochemical production are highlighted for future studies.

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Significantly enhanced oxygen reduction activity of Cu/CuN x C y co-decorated ketjenblack catalyst for Al–air batteries

Cited by 44 publications

References 74 publications

Defect‐Induced Atomic Arrangement in CoFe Bimetallic Heterostructures with Boosted Oxygen Evolution Activity

Defect‐Induced Atomic Arrangement in CoFe Bimetallic Heterostructures with Boosted Oxygen Evolution Activity

Robust Oxygen Reduction Electrocatalysis Enabled by Platinum Rooted on Molybdenum Nitride Microrods

Recent Advances of Electrocatalyst and Cell Design for Hydrogen Peroxide Production

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