Pt/C as a bifunctional ORR/iodide oxidation reaction (IOR) catalyst for Zn-air batteries with unprecedentedly high energy efficiency of 76.5%

Zhao, Siyuan; Liu, Tong; Dai, Yawen; Wang, Jian; Wang, Yan; Guo, Zengjia; Yu, Jie; Bello, Idris Temitope; Ni, Meng

doi:10.1016/j.apcatb.2022.121992

Cited by 49 publications

(38 citation statements)

References 60 publications

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“…Surprisingly, there is almost no change for the XC72R carbon after cycling for 120 h in the electrolyte with KI, indicating the greatly mitigated carbon corrosion by lower charging voltage (Figure b). Moreover, since the charging reaction has been shifted to IOR, the oxygen bubbles generated during the OER process can also be avoided, further alleviating the carbon oxidation. , However, without KI, a new CO bond appears, and the C–O bond becomes sharper and narrower in the degraded XC72R carbon after 80 h of cycling, demonstrating severe carbon corrosion (Figure c). The nearly unchanged atomic ratio of the C–O bond in XC72R carbon can further prove the protection by the KI induced lower voltage (Table ).…”

Section: Resultsmentioning

confidence: 99%

“…Because of the existence of KI, the conventional OER process is substituted by the oxidation of I – , which enjoys a lower oxidation potential (Figure b) . Moreover, the I – oxidation is an electrochemical-chemical process . That is, I – is first oxidized to I 2 by a two-electron pathway with faster kinetics than the sluggish four-electron pathway of OER, and then I 2 becomes disproportionate to I – and IO 3 – in the alkaline environment .…”

Section: Resultsmentioning

confidence: 99%

“…23 Moreover, the I − oxidation is an electrochemical-chemical process. 24 That is, I − is first oxidized to I 2 by a two-electron pathway with faster kinetics than the sluggish four-electron pathway of OER, and then I 2 becomes disproportionate to I − and IO 3 − in the alkaline environment. 25 This way, the battery charging voltage can be significantly decreased.…”

Section: Resultsmentioning

confidence: 99%

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Innovating Rechargeable Zn-Air Batteries for Low Charging Voltage and High Energy Efficiency

et al. 2022

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The commercialization of rechargeable zinc-air batteries (ZABs) is significantly impeded by their high charging voltage and low energy efficiency. In this work, we apply soluble KI to ZABs as a reaction modifier to change the oxidation pathway in the charging process from oxygen evolution reaction to I − oxidation reaction (IOR), which enjoys lower oxidation potential and faster kinetics. In addition, we surprisingly find that commercial cost-effective XC72R carbon delivers satisfactory bifunctional IOR and oxygen reduction reaction activity. Density functional theory calculation is provided to demonstrate the IOR mechanism by XC72R carbon. Finally, the KI-modified ZABs with XC72R exhibit a low charging voltage of 1.79 V, improved energy efficiency of 65.3% (2.0 V and 60% for conventional ZABs with noble-metal catalysts), and long cycle life of over 120 h at 5 mA cm −2 . Further characterizations have illuminated the reason behind the extended battery cycle life as well. This work can significantly facilitate the future use of rechargeable ZABs in energy storage.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Innovating Rechargeable Zn-Air Batteries for Low Charging Voltage and High Energy Efficiency

et al. 2022

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“…35,47,50 Zhao et al reported that Pt/C is capable of catalyzing both the oxidation and reduction reactions. 51 Other test conditions and the battery conguration were the same as those for ZABs using GPE-KOH. Fig.…”

Section: Electrochemical Performance Of Zabs Using Gpe-koh-kimentioning

confidence: 99%

Low-temperature tolerant poly(acrylic acid) (PAA) gel polymer electrolytes for rechargeable zinc–air batteries

et al. 2023

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“…However, with the limitation of the slow kinetic rate in the multi-electron transfer steps, Zn-air batteries still suffer from a large chargedischarge potential gap (ΔE>0.85V) and low energy e ciency [13] . Although Pt-based materials and IrO 2 , RuO 2 materials have been proved to be reliable catalysts for ORR and OER respectively, the scarcity and high price of precious metals have prevented their further popularization [14][15][16][17][18] . Therefore, it is vital to develop a low-cost and high-performance ORR/OER bifunctional catalyst to replace the precious metal materials for the practical application of Zn-air batteries.…”

Section: Introductionmentioning

confidence: 99%

Dysprosium-induced FeNx-Dy2O3 sites for Efficient Bifunctional Oxygen Electrocatalytic Reactions

Luo

Wang

Meng

et al. 2023

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Iron and nitrogen co-doped carbon material (Fe/NC) is considered as a promising catalyst for oxygen reduction reaction (ORR) due to its excellent catalytic activity. However, it is still challenging to further reform the activity of ORR and oxygen evolution reaction (OER). Rare earth elements with unique orbital configuration and catalytic behavior are widely regarded as effective promoters to enhance the electrocatalytic activity of materials. Here, we successfully optimized the oxygen electrocatalytic activity of Fe/NC by the novel addition of Dy element, denoted as Dy2O3-Fe/NC. The resulting material shows excellent ORR/OER activity in 0.1 M KOH, with a half-potential (E1/2) of 0.914 V and an overpotential of 396 mV (at a current density of 10 mA cm-2). The excellent bifunctional electrocatalytic activity is derived from the close synergistic interaction between Fe and Dy, as well as the newly generated active sites of FeNx-Dy2O3. Zn-air battery assembled with Dy2O3-Fe/NC as cathode catalyst shows a high peak power density (225 mW cm-2) and long-term charge-discharge cycle stability.

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Pt/C as a bifunctional ORR/iodide oxidation reaction (IOR) catalyst for Zn-air batteries with unprecedentedly high energy efficiency of 76.5%

Cited by 49 publications

References 60 publications

Innovating Rechargeable Zn-Air Batteries for Low Charging Voltage and High Energy Efficiency

Innovating Rechargeable Zn-Air Batteries for Low Charging Voltage and High Energy Efficiency

Low-temperature tolerant poly(acrylic acid) (PAA) gel polymer electrolytes for rechargeable zinc–air batteries

Dysprosium-induced FeNx-Dy2O3 sites for Efficient Bifunctional Oxygen Electrocatalytic Reactions

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