Enhancing Efficiency and Durability of Alkaline Zn-Co/Air Hybrid Batteries with Self-Reconstructed Co/Co2P Heterojunctions,Advanced Energy Materials

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Enhancing Efficiency and Durability of Alkaline Zn-Co/Air Hybrid Batteries with Self-Reconstructed Co/Co2P Heterojunctions
Advanced Energy Materials ( IF 24.4 ) Pub Date : 2024-08-29 , DOI: 10.1002/aenm.202402839
Zhuying Xu ₁ , Jie Chen ₁ , Tianyu Zhang ₂ , Haidan Lu ₁ , Lei Yan ₂ , Jiqiang Ning ₃ , Yong Hu _{1,

2}

Affiliation

Zn-Co/air hybrid batteries showcase enhanced energy efficiency, power density, and stability compared to Zn-air batteries. Nevertheless, it remains challenging to fabricate multi-functional cathode materials with fast reaction kinetics. Herein the synthesis of a wheat-like cathode composed of the “cereal-grains” of densely arranged Co/Co₂P heterostructures grown on the “central stems” of P/N codoped carbon nanofibers (denoted as Co/Co₂P@PNCF) is presented. The biomimetic nanostructures not only offer abundant exposed active sites to maximize accessibility but also establish efficient multi-channel networks for both electron transfer and O₂/OH⁻ diffusion. Furthermore, the active species of high-valent Co, resulting from self-reconstruction of the Co/Co₂P heterojunction during the first cycle, create efficient Co²⁺ ↔ Co⁴⁺ redox pairs and provide additional charging-discharging voltage plateaus. In situ Raman spectroscopy measurement combined with ex situ X-ray diffraction evidence supports the reversible process of Co^3+/4+O_x(OH)_y ↔ K_xCo^2+/3+O_y, leading to improved efficiency and durability of the battery. As a result, Zn-Co/air hybrid battery based on the Co/Co₂P@PNCF exhibits a remarkable power density (321 mW cm⁻²), ultralong cycle stability (700 h), and a large energy efficiency (62% at 20 mA cm⁻²).

中文翻译：

使用自重构 Co/Co2P 异质结提高碱性 Zn-Co/Air 混合电池的效率和耐用性

与 Zn-air 电池相比，Zn-Co/空气混合动力电池具有更高的能源效率、功率密度和稳定性。然而，制备具有快速反应动力学的多功能正极材料仍然具有挑战性。在此，提出了一种类似小麦的阴极的合成，该阴极由生长在 P/N 共掺杂碳纳米纤维（表示为 Co/Co₂P@PNCF）的“中心茎”上密集排列的 Co/Co₂P 异质结构的“谷物”组成。仿生纳米结构不仅提供丰富的暴露活性位点以最大限度地提高可及性，而且还为电子转移和 O₂/OH⁻ 扩散建立了高效的多通道网络。此外，在第一个循环中由 Co/Co₂P 异质结的自我重构产生的高价 Co 的活性物质产生，产生高效的 Co²⁺ ↔ Co⁴⁺ 氧化还原对，并提供额外的充放电电压平台。原位拉曼光谱测量与非原位 X 射线衍射证据相结合，支持 Co^3+/4+O_x（OH）_y ↔ K_xCo^2+/3+O_y 的可逆过程，从而提高电池的效率和耐用性。因此，基于 Co/Co₂P@PNCF的 Zn-Co/空气混合动力电池表现出卓越的功率密度（321 mW ^cm-2）、超长循环稳定性（700 h）和高能效（在 20 mA ^cm-2 时为 62%）。

更新日期：2024-08-29

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