Ni–Co bimetallic coordination effect for long lifetime rechargeable Zn–air battery

Qiao, Mengfei; Wang, Ying; Wågberg, Thomas; Mamat, Xamxikamar; Hu, Xun; Zou, Guming; Hu, Guangzhi

doi:10.1016/j.jechem.2019.12.005

Cited by 56 publications

(25 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6 ) 36 . Taken together, such collective HAADF-STEM, EDS elemental mapping, EELS and the distance between the metal-pairs confirm the co-existence of Fe and Mn in a form of Fe/Mn atomic pairs 37 .…”

Section: Resultsmentioning

confidence: 56%

Regulating Fe-spin state by atomically dispersed Mn-N in Fe-N-C catalysts with high oxygen reduction activity

et al. 2021

View full text Add to dashboard Cite

As low-cost electrocatalysts for oxygen reduction reaction applied to fuel cells and metal-air batteries, atomic-dispersed transition metal-nitrogen-carbon materials are emerging, but the genuine mechanism thereof is still arguable. Herein, by rational design and synthesis of dual-metal atomically dispersed Fe,Mn/N-C catalyst as model object, we unravel that the O2 reduction preferentially takes place on FeIII in the FeN4 /C system with intermediate spin state which possesses one eg electron (t2g4eg1) readily penetrating the antibonding π-orbital of oxygen. Both magnetic measurements and theoretical calculation reveal that the adjacent atomically dispersed Mn-N moieties can effectively activate the FeIII sites by both spin-state transition and electronic modulation, rendering the excellent ORR performances of Fe,Mn/N-C in both alkaline and acidic media (halfwave positionals are 0.928 V in 0.1 M KOH, and 0.804 V in 0.1 M HClO4), and good durability, which outperforms and has almost the same activity of commercial Pt/C, respectively. In addition, it presents a superior power density of 160.8 mW cm−2 and long-term durability in reversible zinc–air batteries. The work brings new insight into the oxygen reduction reaction process on the metal-nitrogen-carbon active sites, undoubtedly leading the exploration towards high effective low-cost non-precious catalysts.

show abstract

Section: Resultsmentioning

confidence: 56%

Regulating Fe-spin state by atomically dispersed Mn-N in Fe-N-C catalysts with high oxygen reduction activity

et al. 2021

View full text Add to dashboard Cite

show abstract

“…[42][43][44][45][46] Despite the broad prospects of M-N-C catalysis and progress being made over the past decade in catalytic applications of ORR OER, HER, and CO2RR, the precise control of coordination configuration of the metal with nitrogen still remains a major challenge in the in-depth exploration of the catalytic mechanism of the M-N-C catalysts. [47][48][49][50][51][52][53][54][55][56][57] In fact, the coordination number x in M-N x plays an important role in determining the catalytic activity by tailoring the charge distribution of the metal active centers. The x value can be tuned from 1 to 6, corresponding to the configurations of MN 1 , MN 2 , MN 3 , MN 4 , MN 5 , and MN 6 , respectively.…”

Section: Introductionmentioning

confidence: 99%

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

et al. 2021

View full text Add to dashboard Cite

Metal-nitrogen-carbon (M-N-C) material with specifically coordinated configurations is a promising alternative to costly Pt-based catalysts. In the past few years, great progress is made in the studies of M-N-C materials, including the structure modulation and local coordination environment identification via advanced synthetic strategies and characterization techniques, which boost the electrocatalytic performances and deepen the understanding of the underlying fundamentals. In this review, the most recent advances of M-N-C catalysts with specifically coordinated configurations of M-N x (x = 1-6) are summarized as comprehensively as possible, with an emphasis on the synthetic strategy, characterization techniques, and applications in typical electrocatalytic reactions of the oxygen reduction reaction, oxygen evolution reaction, hydrogen evolution reaction, CO 2 reduction reaction, etc., along with mechanistic exploration by experiments and theoretical calculations. Furthermore, the challenges and potential perspectives for the future development of M-N-C catalysts are discussed.

show abstract

“…Here, we demonstrate simple-to-fabricate Co-free air cathodes functionalized with sustainable, aerogel-based electrocatalysts that show a low Δ V of 700 mV and a high discharge voltage in comparison with previously reported Zn–air cathodes. ,,,,,− The electrocatalysts, down-selected from our prior three-electrode investigations of ORR and OER performance, are α-MnO 2 for efficient ORR and Ni 2 FeO x primarily for OER, although nickel-ferrite aerogels also express a bifunctional character . We evaluate these electrocatalyst-functionalized air cathodes versus 3D-Zn-sponge anodes in prototype Zn–air cells.…”

Section: Introductionmentioning

confidence: 73%

Sustainable Electrocatalytic Architectures Enable Rechargeable Zinc–Air Batteries with Low Voltage Hysteresis

Chervin

Hopkins

Hoffmaster

et al. 2020

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Rechargeable zinc−air batteries require air cathodes that support efficient electrocatalysis of both oxygen reduction and oxygen evolution. Electrocatalysts synthesized from abundant, low-cost elements with low-risk supply chains, such as the oxides and hydroxides of manganese, iron, and nickel, are necessary to enable large-scale adoption of zinc−air technology. However, such materials often underperform their cobalt-containing counterparts when required to act as bifunctional catalysts. Using two distinct sustainable electrocatalystsα-MnO 2 for oxygen reduction and Ni 2 FeOx for oxygen evolutionexpressed as ultraporous nanoarchitectures (aerogels) and combining the respective particles in simple powder-composite cathodes, we achieve competitive performance to cobalt-based electrocatalysts. Performance characteristics are verified by pairing these cathodes with zinc (Zn) sponge anodes in Zn−air coin-cells and cycling at a technologically relevant current density (10 mA cm −2 ) to areal energies of 18−36 mW h cm −2 (areal capacities of 15−30 mA h cm −2 ). With a composite cathode comprising a 1:1 weight-to-weight mixture of α-MnO 2 and Ni 2 FeOx aerogels, the cell cycles at a low voltage hysteresis of 700 mV, which is among the most efficient reported under similar operational conditions. A Zn−air cell, using this down-selected cathode, delivered more than 1 A h cm −2 of total capacity over 200 h of cycling before capacity fade occurred. The air cathode reported here is a stepping-stone to enable sustainable, rechargeable, and energy-dense Zn−air batteries.

show abstract

Ni–Co bimetallic coordination effect for long lifetime rechargeable Zn–air battery

Cited by 56 publications

References 34 publications

Regulating Fe-spin state by atomically dispersed Mn-N in Fe-N-C catalysts with high oxygen reduction activity

Regulating Fe-spin state by atomically dispersed Mn-N in Fe-N-C catalysts with high oxygen reduction activity

Metal–Nitrogen–Carbon Catalysts of Specifically Coordinated Configurations toward Typical Electrochemical Redox Reactions

Sustainable Electrocatalytic Architectures Enable Rechargeable Zinc–Air Batteries with Low Voltage Hysteresis

Contact Info

Product

Resources

About