Ultrathin NiFe-LDH nanosheets strongly coupled with MOFs-derived hybrid carbon nanoflake arrays as a self-supporting bifunctional electrocatalyst for flexible solid Zn-air batteries

Liu, Longlong; Hu, Zunpeng; Wang, Minghui; Ma, Jinliang; Chen, Zihao; Ning, Xin; Yuan, Ding

doi:10.1016/j.jallcom.2022.166665

Cited by 24 publications

(15 citation statements)

References 59 publications

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“…Surprisingly, the flexible ZAB assembled by CC/Co 3 O 4 @CoFe-LDH + Pt/C can operate stably for more than 180 cycles (about 30 h) without obvious changes in the voltage gap, displaying excellent charge–discharge cycling stability. In addition, three flexible ZABs connected in series successfully lit the LED lamp, and the lamp brightness was stable when the flexible ZABs were in a bent state (Figure e), further validating the superb flexibility. , These findings imply that the CC/Co 3 O 4 @CoFe-LDH catalyst, with its high electrochemical performance and long-lasting stability, is a promising air electrode having a great potential for application in advanced energy storage and conversion technologies.…”

Section: Resultssupporting

confidence: 52%

“…In addition, three flexible ZABs connected in series successfully lit the LED lamp, and the lamp brightness was stable when the flexible ZABs were in a bent state (Figure 8e), further validating the superb flexibility. 64,65 These findings imply that the CC/Co 3 O 4 @CoFe-LDH catalyst, with its high electrochemical performance and long-lasting stability, is a promising air electrode having a great potential for application in advanced energy storage and conversion technologies.…”

Section: Resultsmentioning

confidence: 95%

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Construction of 3D Hierarchical Co₃O₄@CoFe-LDH Heterostructures with Effective Interfacial Charge Redistribution for Rechargeable Liquid/Solid Zn–Air Batteries

et al. 2023

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Constructing three-dimensional (3D) hierarchical heterostructures is an appealing but challenging strategy to improve the performance of catalysts for electrical energy devices. Here, an efficient and robust flexible self-supporting catalyst, interface coupling of ultrathin CoFe-LDH nanosheets and Co3O4 nanowire arrays on the carbon cloth (CC/Co3O4@CoFe-LDH), was proposed for boosting oxygen evolution reaction (OER) in rechargeable liquid/solid Zn–air batteries (ZABs). The strong interfacial interaction between the CoFe-LDH and Co3O4 heterostructures stimulated the charge redistribution in their coupling regions, which improved the electron conductivity and optimized the adsorption free energy of OER intermediates, ultimately boosting the intrinsic OER performance. Besides, the 3D hierarchical nanoarray structure facilitated the exposure of catalytically active centers and rapid electron/mass transfer during the OER process. As such, the CC/Co3O4@CoFe-LDH catalyst achieved excellent OER catalytic activity in alkaline medium, with a small overpotential of 237 mV at 10 mA cm–2, a low Tafel slope of 35.43 mV dec–1, and long-term durability of up to 48 h, significantly outperforming the commercial RuO2 catalyst. More impressively, the liquid and flexible solid-state ZABs assembled by the CC/Co3O4@CoFe-LDH hybrid catalyst as the OER catalyst presented a stable open circuit voltage, large power density, superb cycling life, and satisfactory flexibility, indicating great potential applications in energy technology. This work provides a good guidance for the development of advanced electrocatalysts with heterostructures and an in-depth understanding of electronic modulation at the heterogeneous interface.

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Section: Resultssupporting

confidence: 52%

Section: Resultsmentioning

confidence: 95%

Construction of 3D Hierarchical Co₃O₄@CoFe-LDH Heterostructures with Effective Interfacial Charge Redistribution for Rechargeable Liquid/Solid Zn–Air Batteries

et al. 2023

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“…To evaluate its practical application effect, BZIF‐C@LDH was used as a catalyst on the air electrode of RZABs [25] . Firstly, the RZABs assembled by BZIF‐C@LDH generated an OCP of 1.427 V (Figure 6a).…”

Section: Resultsmentioning

confidence: 99%

Facile Fabrication of NiFe Double Hydroxide on Carbon Matrix Composites as an Efficient Oxygen Electrocatalyst for Rechargeable Zn‐air Batteries

Dong

Yao

et al. 2023

ChemistrySelect

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Air cathodes with highly effective oxygen reduction and oxygen evolution reaction performance are crucial for commercial applications in rechargeable Zn-air batteries (RZABs). Commercial catalysts are expensive and scarce, which restricts their practical applications. Therefore, the design of high-costperformance and electrochemical activities bifunctional nonprecious metal catalysts is urgent. The bifunctional catalyst (BZIF-C@LDH) combining NiFe-LDH and ZIF-8&ZIF-67 derivative (BZIF-C) was readily prepared with a co-precipitation approach.As expected, the obtained BZIF-C@LDH exhibits outstanding bifunctional performance (ΔE = 0.761 V) for oxygen reduction and oxygen evolution reaction. Furthermore, compared to commercial Pt/C-RuO 2 in RZABs, BZIF-C@LDH displays a superior energy density (1033 Wh kg À 1 ), which is close to the theoretical energy density (1086 Wh kg À 1 ). This work provides a straightforward and inexpensive strategy for the synthesis of excellent and practicable bifunctional catalysts for RZABs.

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“…Flexible ZABs with a sandwich structure consist of a polished Zn foil as the anode, CC/NiCo 2 O 4 @NiFeLDH + Pt/C (mass ratio of 1:1) as the cathode, a nickel mesh as the current collector, and a polyvinyl alcohol (PVA) gel electrolyte. The PVA solid electrolyte containing KOH and Zn(CH 3 COO) 2 was obtained using heating, freezing, and thawing processes according to previous work . The open-circuit voltage and chare/discharge polarization curves were tested using a CHI 760e workstation.…”

Section: Methodsmentioning

confidence: 99%

Synergetic Nanostructure Engineering and Electronic Modulation of a 3D Hollow Heterostructured NiCo₂O₄@NiFe-LDH Self-Supporting Electrode for Rechargeable Zn–Air Batteries

Dong

et al. 2023

Inorg. Chem.

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Developing electrocatalysts that integrate the merits of the hollow structure and heterojunction is an attractive but still challenging strategy for addressing the sluggish kinetics of oxygen evolution reaction (OER) in many renewable energy technologies. Herein, a 3D hierarchically flexible self-supporting electrode with a hollow heterostructure is intentionally constructed by assembling thin NiFe layered double hydroxide (LDH) nanosheets on the surface of metal−organic framework-derived hollow NiCo 2 O 4 nanoflake arrays (NiCo 2 O 4 @NiFe-LDH) for rechargeable Zn−air batteries (ZABs). Theoretical calculations demonstrate that the interfacial electron transfer from NiFe-LDH to NiCo 2 O 4 induces the electronic modulation, improves the conductivity, and lowers the reaction energy barriers during OER, ensuring high catalytic activity. Meanwhile, the 3D hierarchically hollow nanoarray architecture can afford plentiful catalytic active sites and short mass-/ charge-transfer pathways. As a result, the obtained catalyst exhibits remarkable OER electrocatalytic performance, showing low overpotentials (only 231 mV at 10 mA cm −2 , 300 mV at 50 mA cm −2 ) and robust stability. When assembling liquid and flexible solid-state ZABs with NiCo 2 O 4 @NiFe-LDH as the OER catalyst, the ZABs achieve excellent power density, high specific capacity, superior cycle durability, and good bending flexibility, exceeding the RuO 2 + Pt/C benchmarks and other previously reported selfsupporting catalysts. This work not only constructs an advanced hollow heterostructured catalyst for sustainable energy systems and wearable electronic devices but also provides insights into the role of interfacial electron modulation in catalytic performance enhancement.

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Ultrathin NiFe-LDH nanosheets strongly coupled with MOFs-derived hybrid carbon nanoflake arrays as a self-supporting bifunctional electrocatalyst for flexible solid Zn-air batteries

Cited by 24 publications

References 59 publications

Construction of 3D Hierarchical Co₃O₄@CoFe-LDH Heterostructures with Effective Interfacial Charge Redistribution for Rechargeable Liquid/Solid Zn–Air Batteries

Construction of 3D Hierarchical Co₃O₄@CoFe-LDH Heterostructures with Effective Interfacial Charge Redistribution for Rechargeable Liquid/Solid Zn–Air Batteries

Facile Fabrication of NiFe Double Hydroxide on Carbon Matrix Composites as an Efficient Oxygen Electrocatalyst for Rechargeable Zn‐air Batteries

Synergetic Nanostructure Engineering and Electronic Modulation of a 3D Hollow Heterostructured NiCo₂O₄@NiFe-LDH Self-Supporting Electrode for Rechargeable Zn–Air Batteries

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Ultrathin NiFe-LDH nanosheets strongly coupled with MOFs-derived hybrid carbon nanoflake arrays as a self-supporting bifunctional electrocatalyst for flexible solid Zn-air batteries

Cited by 24 publications

References 59 publications

Construction of 3D Hierarchical Co3O4@CoFe-LDH Heterostructures with Effective Interfacial Charge Redistribution for Rechargeable Liquid/Solid Zn–Air Batteries

Construction of 3D Hierarchical Co3O4@CoFe-LDH Heterostructures with Effective Interfacial Charge Redistribution for Rechargeable Liquid/Solid Zn–Air Batteries

Facile Fabrication of NiFe Double Hydroxide on Carbon Matrix Composites as an Efficient Oxygen Electrocatalyst for Rechargeable Zn‐air Batteries

Synergetic Nanostructure Engineering and Electronic Modulation of a 3D Hollow Heterostructured NiCo2O4@NiFe-LDH Self-Supporting Electrode for Rechargeable Zn–Air Batteries

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Construction of 3D Hierarchical Co₃O₄@CoFe-LDH Heterostructures with Effective Interfacial Charge Redistribution for Rechargeable Liquid/Solid Zn–Air Batteries

Construction of 3D Hierarchical Co₃O₄@CoFe-LDH Heterostructures with Effective Interfacial Charge Redistribution for Rechargeable Liquid/Solid Zn–Air Batteries

Synergetic Nanostructure Engineering and Electronic Modulation of a 3D Hollow Heterostructured NiCo₂O₄@NiFe-LDH Self-Supporting Electrode for Rechargeable Zn–Air Batteries