Metastable Rocksalt Oxide Mediated Synthesis of High-Density Dual-Protected M@NC for Long-life Rechargeable Zinc-Air Batteries with Record Power Density,Journal of the American Chemical Society

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Metastable Rocksalt Oxide Mediated Synthesis of High-Density Dual-Protected M@NC for Long-life Rechargeable Zinc-Air Batteries with Record Power Density
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2020-03-20 , DOI: 10.1021/jacs.0c01349
Tang Tang _{1,

2} , Wen-Jie Jiang ₁ , Xiao-Zhi Liu _{2,

3} , Jun Deng _{2,

3} , Shuai Niu _{1,

2} , Bin Wang ₄ , Shi-Feng Jin _{2,

3} , Qiang Zhang ₅ , Lin Gu _{2,

3} , Jin-Song Hu _{1,

2} , Li-Jun Wan _{1,

2}

Affiliation

Creating high-density durable bifunctional active sites in air electrode is essential, but still challenging for long-life rechargeable zinc-air battery with appealing power density. Herein, we discover a general strategy mediated by metastable rocksalt oxides for achieving high-density well-defined transition metal nanocrystals encapsulated in N-doped carbon shells (M@NC) which are anchored on substrate by porous carbon network as highly-active and durable bifunctional catalytic sites. Well-dispersed Co2Fe1@NC in a small uniform size (15 ± 5 nm) and high density (metal loading up to 54.0 wt%) offers zinc-air battery a record power density of 423.7 mW cm-2. The dual protection from the complete graphitic carbon shells and the anchoring of outer carbon network makes Co2Fe1@NC chemically and mechanically durable, giving the battery a long cycling life. Systematic in-situ temperature-dependent characterizations as well as DFT modelling rationalize the rocksalt-oxide mediated process and its indispensable role in achieving high-density nanosized M@NC. These findings open up opportunities for designing efficient electrocatalysts towards high-performance Zn-air batteries and diverse energy devices.

中文翻译：

亚稳态岩盐氧化物介导的高密度双保护 M@NC 合成，用于具有创纪录功率密度的长寿命可充电锌空气电池

在空气电极中创建高密度耐用的双功能活性位点是必不可少的，但对于具有吸引人的功率密度的长寿命可充电锌空气电池仍然具有挑战性。在此，我们发现了一种由亚稳态岩盐氧化物介导的通用策略，用于实现封装在 N 掺杂碳壳 (M@NC) 中的高密度明确过渡金属纳米晶体，该碳壳通过多孔碳网络锚定在基材上，具有高活性和耐用性双功能催化位点。分散良好的 Co2Fe1@NC 具有小而均匀的尺寸 (15 ± 5 nm) 和高密度（金属负载量高达 54.0 wt%），为锌空气电池提供了创纪录的 423.7 mW cm-2 功率密度。完整的石墨碳壳的双重保护和外部碳网络的锚定使 Co2Fe1@NC 在化学和机械上具有耐用性，使电池具有较长的循环寿命。系统的原位温度相关表征以及 DFT 建模使岩盐-氧化物介导的过程及其在实现高密度纳米 M@NC 中不可或缺的作用合理化。这些发现为设计用于高性能锌空气电池和多种能源设备的高效电催化剂提供了机会。

更新日期：2020-03-20

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