Co<sub>3</sub>O<sub>4</sub> Nanosheets as Active Material for Hybrid Zn Batteries

Tan, Peng; Chen, Bin; Xu, Haoran; Cai, Weizi; He, Wei; Liu, Meilin; Shao, Zongping; Ni, Meng

doi:10.1002/smll.201800225

Cited by 137 publications

(95 citation statements)

References 41 publications

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“…This phenomenon combined with the settled battery parameters suggests termination of the lattice oxygen activation process 25 . Third, several previous reports have proposed to combine the conversion reactions of principal elements with the oxygen reactions to form hybrid batteries [50][51][52] . From the above results, it is clear that the performance contribution of Co redox is too small to be reflected by any additional voltage plateaus, especially in long-period cycling tests.…”

Section: Discussionmentioning

confidence: 99%

Dynamic electrocatalyst with current-driven oxyhydroxide shell for rechargeable zinc-air battery

et al. 2020

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Recent fruitful studies on rechargeable zinc-air battery have led to emergence of various bifunctional oxygen electrocatalysts, especially metal-based materials. However, their electrocatalytic configuration and evolution pathway during battery operation are rarely spotlighted. Herein, to depict the underlying behaviors, a concept named dynamic electrocatalyst is proposed. By selecting a bimetal nitride as representation, a current-driven "shell-bulk" configuration is visualized via time-resolved X-ray and electron spectroscopy analyses. A dynamic picture sketching the generation and maturation of nanoscale oxyhydroxide shell is presented, and periodic valence swings of performance-dominant element are observed. Upon maturation, zinc-air battery experiences a near twofold enlargement in power density to 234 mW cm −2 , a gradual narrowing of voltage gap to 0.85 V at 30 mA cm −2 , followed by stable cycling for hundreds of hours. The revealed configuration can serve as the basis to construct future blueprints for metal-based electrocatalysts, and push zinc-air battery toward practical application.

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Section: Discussionmentioning

confidence: 99%

Dynamic electrocatalyst with current-driven oxyhydroxide shell for rechargeable zinc-air battery

et al. 2020

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“…In order to further increase Zn–air battery discharge potential and energy density, concepts of hybridizing Zn–air battery with other Faradic energy storage processes have been explored. The air electrode was designed by loading redox capable metal oxides/hydroxides, such as Co 3 O 4 , MnCo 2 O 4 , or Ni/Co(OH) 2 , as both oxygen electrocatalysts and energy storage materials . Another approach to increase battery discharge potential is by carrying out the oxygen reduction reaction in acidic electrolytes where the standard potential of oxygen reduction is 1.23 V (by four‐electron transfer pathway) .…”

Section: Discussionmentioning

confidence: 99%

Recent Advances in Materials and Design of Electrochemically Rechargeable Zinc–Air Batteries

Chen

Zhou

Karahan

et al. 2018

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The century-old zinc-air (Zn-air) battery concept has been revived in the last decade due to its high theoretical energy density, environmental-friendliness, affordability, and safety. Particularly, electrically rechargeable Zn-air battery technologies are of great importance for bulk applications like electric vehicles, grid management, and portable electronic devices. Nevertheless, Zn-air batteries are still not competitive enough to realize widespread practical adoption because of issues in efficiency, durability, and cycle life. Here, following an introduction to the fundamentals and performance testing techniques, the latest research progress related to electrically rechargeable Zn-air batteries is compiled, particularly new key findings in the last five years (2013-2018). The strategies concerning the development of Zn and air electrodes are in focus. The design of other battery components, namely electrolytes and separators are also discussed. Poor performance of O electrocatalysts and the lack of the long-term stability of Zn electrodes and electrolytes remain major challenges. Finally, recommendations regarding the testing routines and materials design are provided. It is hoped that this up-to-date account will help to shape the future research activities toward the development of practical electrically rechargeable Zn-air batteries with extended lifetime and superior performance.

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“…[43] The electrochemical behaviour of Zn electrode in acidic or neutral solutions is obviously different from that in alkaline electrolytes. [44][45][46] In acidic solutions, there is a pair of redox peaks at −0.80/−1.00 V (vs SCE) corresponding to the plating and dissolution of Zn. In alkaline electrolytes , which is much lower than the potential of former one.…”

Section: Resultsmentioning

confidence: 99%

A Fully Aqueous Hybrid Electrolyte Rechargeable Battery with High Voltage and High Energy Density

Yuan

Zeng

et al. 2020

Advanced Energy Materials

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explored for increasing the energy density of ARBs: one is to use electrode materials with higher specific capacities and the other is to improve the output voltages of ARBs. [7-9] Applying high capacity materials, such as sulfur and zinc metal, as electrode materials can significantly improve the energy density of ARBs to an anticipated level, but the energy density of ARBs is still relatively limited for two main reasons. [10-15] First, the specific capacity of most electrode materials is not much different from that used for organic systems. [8] Second, the standard working voltage of these batteries is less than 2 V, which is restricted by the narrow electrochemical stability window of a single-phase solution. Using a cathode material with a higher potential, and a anode material with lower potential can effectively utilize the voltage window of a single electrolyte to a greater extent, [16,17] but the increment of energy density is still restricted due to the limited voltage window of a single electrolyte. Therefore, in order to fully improve the energy density of ARBs, an extended voltage window of electrolytes is highly desired to match the electrode materials with higher or lower working potential. So far, there are mainly four ways to widen the voltage stability window of aqueous electrolytes. First, an artificial solid electrolyte interface (SEI) is introduced to prevent the negative electrodes (such as Li metal, Mg metal and graphite) with extremely low working potential from contact with aqueous electrolytes directly. [18-23] This approach could promise ARBs with ultra-high voltage and ultra-high energy density, but requires dense ceramic membrane that can conduct Li + and effectively block water molecules. The synthesis of ceramic membrane is complex and its price is high. Second, the voltage stability window can be widened by using super-concentrated aqueous electrolytes, which include "'water-in-salt"' electrolytes (3.0 V), "'water-in-bisalt"' electrolytes (3.1 V) and hydrate-melt electrolytes (3.8 V), etc. [10,24-30] This method opens up a new horizon for high voltage, high energy density ARBs, but the used organic lithium salts are more expensive and less suitable for large-scale applications. [31-34] Third, the addition of additives can form an interface similar to SEI on the surface of the material, which can also effectively widen the voltage stability window of aqueous electrolyte. [35-38] Fourth, electrolytes with different pH values, mainly acid electrolytes and alkaline electrolytes, are assembled to form a hybrid electrolyte system. This method is relatively simple, and the electrolyte salt used is Aqueous rechargeable batteries (ARBs) offer advantages in terms of safety, environmental friendliness and cost over their non-aqueous counterparts. However, the narrow electrochemical stability window of water inherently limits the output voltage and energy density of ARBs. Here, a system with an aqueous hybrid electrolyte containing a Zn anode in alkaline solution and LiMn 2 O 4 cathode in neu...

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Co₃O₄ Nanosheets as Active Material for Hybrid Zn Batteries

Cited by 137 publications

References 41 publications

Dynamic electrocatalyst with current-driven oxyhydroxide shell for rechargeable zinc-air battery

Dynamic electrocatalyst with current-driven oxyhydroxide shell for rechargeable zinc-air battery

Recent Advances in Materials and Design of Electrochemically Rechargeable Zinc–Air Batteries

A Fully Aqueous Hybrid Electrolyte Rechargeable Battery with High Voltage and High Energy Density

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Co3O4 Nanosheets as Active Material for Hybrid Zn Batteries

Cited by 137 publications

References 41 publications

Dynamic electrocatalyst with current-driven oxyhydroxide shell for rechargeable zinc-air battery

Dynamic electrocatalyst with current-driven oxyhydroxide shell for rechargeable zinc-air battery

Recent Advances in Materials and Design of Electrochemically Rechargeable Zinc–Air Batteries

A Fully Aqueous Hybrid Electrolyte Rechargeable Battery with High Voltage and High Energy Density

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Co₃O₄ Nanosheets as Active Material for Hybrid Zn Batteries