Directly anchoring Ag single atoms on α-MnO2 nanorods as efficient oxygen reduction catalysts for Mg-air fuel cell

Li, Guangxing; Jiang, Min; Liao, Qin; Ding, Ruida; Gao, Yuanhang; Jiang, Linwu; Zhang, Dina; Chen, Shuguang; He, Hao

doi:10.1016/j.jallcom.2020.157672

Cited by 25 publications

(8 citation statements)

References 48 publications

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“…Li et al [96] loaded single Ag atoms directly on the surface of a-MnO 2 nanorods to improve the oxygen reduction performance of Mg-air fuel cells. Modification of an Ag atom increases the content of Mn(III) and oxygen vacancy, and the catalytic activity of a-MnO 2 is significantly improved.…”

Section: Batteriesmentioning

confidence: 99%

Research Progress and Application of Single-Atom Catalysts: A Review

Wang²,

Liu

et al. 2021

Molecules

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Due to excellent performance properties such as strong activity and high selectivity, single-atom catalysts have been widely used in various catalytic reactions. Exploring the application of single-atom catalysts and elucidating their reaction mechanism has become a hot area of research. This article first introduces the structure and characteristics of single-atom catalysts, and then reviews recent preparation methods, characterization techniques, and applications of single-atom catalysts, including their application potential in electrochemistry and photocatalytic reactions. Finally, application prospects and future development directions of single-atom catalysts are outlined.

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Section: Batteriesmentioning

confidence: 99%

Research Progress and Application of Single-Atom Catalysts: A Review

Wang²,

Liu

et al. 2021

Molecules

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“…Regular lattice fringes with a lattice distance of 0.49 nm corresponding to the (002) face are identified obviously in both samples, confirming that the doped Ni is not embedded into the MnO 2 lattice. 23 Figure 1g shows the elemental mapping of Ni/α-MnO 2 . Ni is uniformly distributed without distinguished aggregated phase (e.g., NiO and Ni nanoparticles).…”

Section: Materials Characterizationmentioning

confidence: 99%

“…Single atoms can be stabilized with strong interactions between single atoms and oxide supports, and their synergistic effect would significantly boost catalytic activity. 23 In this work, a straightforward solid-phase synthesis approach was utilized to anchor Ni single atoms onto the α-MnO 2 surface. The impact of atomic Ni decoration on oxygen reduction/evolution was subsequently investigated.…”

Section: Introductionmentioning

confidence: 99%

“…There have been some attempts to apply it to zinc–air batteries. These attempts include doping metal elements such as Ce, Co, Ag, etc., − or compounding with other materials such as carbon-based materials, metal oxides, etc. , These works demonstrate a positive effect on enhancing the ORR and OER characteristics, however, their complex material systems and preparation methods limit their in-depth research as well as application. The decoration of metal single atoms onto the MnO 2 surface has been demonstrated to be an effective strategy for enhancing catalyst performance.…”

Section: Introductionmentioning

confidence: 99%

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Single-Atom Ni Anchored on α-MnO₂ Nanorods as an Electrocatalyst for the Oxygen Evolution and Oxygen Reduction Reactions

Xie,

Chen,

et al. 2024

ACS Appl. Nano Mater.

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Developing efficient MnO 2 -based bifunctional catalysts is a considerable challenge due to slow oxygen reduction reaction (ORR) kinetics and the limited activity of the oxygen evolution reaction (OER). Herein, an efficient bifunctional catalyst Ni/α-MnO 2 is prepared by a straightforward solid-phase synthesis method, enabling the anchoring of Ni atoms onto the α-MnO 2 surface. The electrochemically active surface area is significantly enhanced due to the generation of oxygen vacancies and presence of atomic Ni sites. After Ni decoration, the half-wave potential of the ORR is elevated to 0.82 V, while the overpotential for the OER is reduced to 366 mV, resulting in an exceptionally low overall oxygen overpotential (ΔE = 0.79 V). Density functional theory calculations reveal that the d-band center of Mn exhibits negative shifts, consequently lowering the energy barrier for the conversion of OOH* to O* in the ORR and that of OH* to O* in the OER. In a secondary zinc−air battery, a supreme power density of 290 mW cm −2 is acquired at a current density of 350 mA cm −2 , surpassing the performance of pristine α-MnO 2 . This work offers valuable guidance for the development of highperformance MnO 2 -based bifunctional catalysts.

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“…Moreover, the depletion of fossil fuel reserves to meet energy requirements is in the spotlight due to energy security worries and political issues [ 3 ]. Thus, much effort is currently being dedicated globally to developing cleaner and renewable energy technologies [ 4 , 5 ]. In this scenario, fuel cells, in which ORR is the reaction occurring at the cathode, are considered clean and renewable electrical energy generators with potential for future applications [ 3 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

MnO2-Ir Nanowires: Combining Ultrasmall Nanoparticle Sizes, O-Vacancies, and Low Noble-Metal Loading with Improved Activities towards the Oxygen Reduction Reaction

et al. 2022

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Although clean energy generation utilizing the Oxygen Reduction Reaction (ORR) can be considered a promising strategy, this approach remains challenging by the dependence on high loadings of noble metals, mainly Platinum (Pt). Therefore, efforts have been directed to develop new and efficient electrocatalysts that could decrease the Pt content (e.g., by nanotechnology tools or alloying) or replace them completely in these systems. The present investigation shows that high catalytic activity can be reached towards the ORR by employing 1.8 ± 0.7 nm Ir nanoparticles (NPs) deposited onto MnO2 nanowires surface under low Ir loadings (1.2 wt.%). Interestingly, we observed that the MnO2-Ir nanohybrid presented high catalytic activity for the ORR close to commercial Pt/C (20.0 wt.% of Pt), indicating that it could obtain efficient performance using a simple synthetic procedure. The MnO2-Ir electrocatalyst also showed improved stability relative to commercial Pt/C, in which only a slight activity loss was observed after 50 reaction cycles. Considering our findings, the superior performance delivered by the MnO2-Ir nanohybrid may be related to (i) the significant concentration of reduced Mn3+ species, leading to increased concentration of oxygen vacancies at its surface; (ii) the presence of strong metal-support interactions (SMSI), in which the electronic effect between MnOx and Ir may enhance the ORR process; and (iii) the unique structure comprised by Ir ultrasmall sizes at the nanowire surface that enable the exposure of high energy surface/facets, high surface-to-volume ratios, and their uniform dispersion.

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Directly anchoring Ag single atoms on α-MnO2 nanorods as efficient oxygen reduction catalysts for Mg-air fuel cell

Cited by 25 publications

References 48 publications

Research Progress and Application of Single-Atom Catalysts: A Review

Research Progress and Application of Single-Atom Catalysts: A Review

Single-Atom Ni Anchored on α-MnO₂ Nanorods as an Electrocatalyst for the Oxygen Evolution and Oxygen Reduction Reactions

MnO2-Ir Nanowires: Combining Ultrasmall Nanoparticle Sizes, O-Vacancies, and Low Noble-Metal Loading with Improved Activities towards the Oxygen Reduction Reaction

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Directly anchoring Ag single atoms on α-MnO2 nanorods as efficient oxygen reduction catalysts for Mg-air fuel cell

Cited by 25 publications

References 48 publications

Research Progress and Application of Single-Atom Catalysts: A Review

Research Progress and Application of Single-Atom Catalysts: A Review

Single-Atom Ni Anchored on α-MnO2 Nanorods as an Electrocatalyst for the Oxygen Evolution and Oxygen Reduction Reactions

MnO2-Ir Nanowires: Combining Ultrasmall Nanoparticle Sizes, O-Vacancies, and Low Noble-Metal Loading with Improved Activities towards the Oxygen Reduction Reaction

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Product

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Single-Atom Ni Anchored on α-MnO₂ Nanorods as an Electrocatalyst for the Oxygen Evolution and Oxygen Reduction Reactions