A Facile and Scalable Strategy for Fabrication of Superior Bifunctional Freestanding Air Electrodes for Flexible Zinc–Air Batteries

Liu, Ting; Mou, Jirong; Wu, Zhen; Lv, Chao; Huang, Jianlin; Liu, Meilin

doi:10.1002/adfm.202003407

Cited by 124 publications

(89 citation statements)

References 45 publications

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“…Communications density is about forty-six times of the aqueous lithium-ion battery (Figure S9). [28][29][30][31][32][33] Besides the high electrochemical performance, the Mg-air battery could be made into a fiber shape with a coaxial structure, and it was flexible (Figure S10). The fiber Mg-air battery performed a stable output voltage after bending to 458, 908 and 1358.…”

Section: Angewandte Chemiementioning

confidence: 99%

High‐Energy‐Density Magnesium‐Air Battery Based on Dual‐Layer Gel Electrolyte

Chen

et al. 2021

Angew Chem Int Ed

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Mg-air batteries are explored as the next-generation power systems for wearable and implantable electronics as they could work stably in neutral electrolytes and are also biocompatible. However, high corrosion rate and low utilization of Mg anode largely impair the performance of Mg-air battery with low discharge voltage, poor specific capacity and low energy density. Here, to the best of our knowledge, we first report a dual-layer gel electrolyte to simultaneously solve the above two problems by preventing the corrosion of Mg anode and the production of dense passive layer, respectively. The resulting Mg-air batteries produced an average specific capacity of 2190 mAh g À1 based on the total Mg anode (99.3 % utilization rate of Mg anode) and energy density of 2282 Wh kg À1 based on the total anode and air electrode, both of which are the highest among the reported Mg-air batteries. Besides, our Mg-air batteries could be made into a fiber shape, and they were flexible to work stably under various deformations such as bending and twisting.Wearable and implantable electronic devices represent the next-generation electronics and are booming rapidly in the recent decade. [1][2][3] To stably and long-termly power these electronic devices, it is critical to make matchable and safe energy storage devices. [4][5][6][7] To this end, metal-air batteries with high energy densities have attracted increasing interests. [8,9] Among them, Mg-air batteries work stably in neutral electrolytes and are also biocompatible as Mg 2+ ions are harmless to the human body. [10][11][12] Therefore, Mg-air batteries are explored as promising candidates on the skin and inside the body.

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Section: Angewandte Chemiementioning

confidence: 99%

High‐Energy‐Density Magnesium‐Air Battery Based on Dual‐Layer Gel Electrolyte

Chen

et al. 2021

Angew Chem Int Ed

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“…Such single cell with NCF as air cathode holds high OCV up to 1.499 V (Figure S23, Supporting Information), which can rival with those in the reported state-of-the-art solid-state ZABs. [52][53][54] The coin cell type ZAB could steadily discharge at 5 mA cm −2 for 10 000 s without conspicuous voltage attenuation (Figure 4i). More impressively, six coin cells in series could light up 51 parallel high-power red LED lamp beads and keep high brightness (inset in Figure 4i), revealing great potential as portable power source in practical applications.…”

Section: Resultsmentioning

confidence: 99%

Engineering Synergistic Edge‐N Dipole in Metal‐Free Carbon Nanoflakes toward Intensified Oxygen Reduction Electrocatalysis

Zhang

et al. 2021

Adv Funct Materials

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Nitrogen doping represents an effective way to induce charge/spin polarization in nanocarbons for promoting oxygen reduction reaction (ORR) activity. However, it remains elusive to define the dominant active sites with respect to two critical N-configurations of pyridinic-N and graphitic-N. Herein, a tandem catalytic graphitization and nitrogen modification strategy for the synthesis of metal-free nitrogen-doped carbon nanoflakes (NCF) featuring the edge-suffused and graphite-analogous structure is presented. NCF exhibits superb Pt-like ORR activity (0.85 V for half-wave potential and 5.9 mA cm −2 for diffusion-limited current density) but much stronger robustness in the alkaline medium. The experimental and theoretical studies suggest the key role of graphitic-N in ORR. Furthermore, it unveils that the high activity of NCF should be traced to a synergistic polarization of the edge-type pyridinic-N/graphitic-N dipole spaced by one edge peak carbon atom on the armchair edges. This study sheds light on the understanding of ORR active sites in the nitrogen-doped nanocarbons for ORR.

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“…The encapsulated Co NPs at the tips of N‐doped CNTs excite the catalytic active sites through the interaction with the N‐doped graphitic carbon shell. Meanwhile, the surrounding carbon layer prevent the NPs from aggregation and leaching during the electrochemical process 85 . Accordingly, the interconnected macroporous carbon ensures the exposure of the well dispersed NPs (Figure 8E,F).…”

Section: Tm/carbon Hybrids For Oxygen Electrocatalystsmentioning

confidence: 99%

Transition metal/carbon hybrids for oxygen electrocatalysis in rechargeable zinc‐air batteries

Douka

Yang

Huang

et al. 2020

EcoMat

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Zinc‐air batteries (ZABs) could be an ideal candidate for challenging energy conversion and storage technology. Usually, the crucial oxygen reduction reaction and oxygen evolution reaction are naturally lethargic and require efficient catalysts to kinetically boost the energy conversion processes to achieve the practicable ZABs application. Transition‐metal/carbon hybrid catalysts show excellent potentials in electrocatalysis, and they have been developed into cost‐effective and scalable oxygen electrocatalyst alternatives for expensive and scarcer noble metal ones in rechargeable ZABs. Herein we summarize recent achievements in transition metal/carbon hybrids for oxygen electrocatalysis. These catalysts mainly fall into two categories by the integrated metal/metal oxides nanoparticles and atomically dispersed transition metal/carbon matrix. We focus on the relationship between structure and performance with their synthesis strategies. Their application in rechargeable ZABs are also comprehensively discussed. Finally, the perspectives on transition metal/carbon hybrids for oxygen electrocatalysis are presented for the future challenges in rechargeable ZABs.

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A Facile and Scalable Strategy for Fabrication of Superior Bifunctional Freestanding Air Electrodes for Flexible Zinc–Air Batteries

Cited by 124 publications

References 45 publications

High‐Energy‐Density Magnesium‐Air Battery Based on Dual‐Layer Gel Electrolyte

High‐Energy‐Density Magnesium‐Air Battery Based on Dual‐Layer Gel Electrolyte

Engineering Synergistic Edge‐N Dipole in Metal‐Free Carbon Nanoflakes toward Intensified Oxygen Reduction Electrocatalysis

Transition metal/carbon hybrids for oxygen electrocatalysis in rechargeable zinc‐air batteries

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