N-Doped-carbon/cobalt-nanoparticle/N-doped-carbon multi-layer sandwich nanohybrids derived from cobalt MOFs having 3D molecular structures as bifunctional electrocatalysts for on-chip solid-state Zn-air batteries.,Nanoscale

当前位置： X-MOL 学术 › Nanoscale › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

N-Doped-carbon/cobalt-nanoparticle/N-doped-carbon multi-layer sandwich nanohybrids derived from cobalt MOFs having 3D molecular structures as bifunctional electrocatalysts for on-chip solid-state Zn-air batteries.
Nanoscale ( IF 5.8 ) Pub Date : 2020-01-29 , DOI: 10.1039/c9nr09779a
Juanjuan Zhao ₁ , Haibo Hu ₁ , Mingzai Wu ₁

Affiliation

The unsatisfactory energy efficiency and leakable liquid electrolytes in conventional Zn-air batteries with intrinsic semi-open structures greatly limit their opportunity to be a safe micropower source for flexible/wearable electronics. Herein, N-doped-carbon/cobalt-nanoparticle/N-doped-carbon (NdC-CoNP-NdC) multi-layer sandwich nanohybrids were first synthesized via the pyrolysis of a well-designed Co-MOF precursor with a 3D molecular framework. Profiting from the synergistic effect enabled by the interlayer-confined growth of monodispersed cobalt nanoparticles having high activity/stability and a thousand-layer-cake porous N-self-doped carbon skeleton of high conductivity and additional active sites as well as the reasonable design of a multi-layer sandwich interface structure between them that acts as an interconnected nanoreactor, the as-obtained NdC-CoNP-NdC multi-layer sandwich nanohybrids exhibit excellent bifunctional catalytic activity of a small ORR/OER gap (0.83 V). We followed a planar electrode configuration design with an interdigital carbon cloth coated with NdC-CoNP-NdC as the air cathode and an interdigital Zn foil as the metal anode as well as the introduction of a polyacrylamide-co-polyacrylic/6 M KOH alkaline gel as an incombustible solid-state electrolyte. Thus, on-chip all-solid-state rechargeable Zn-air batteries (OAR-ZABs) are further developed, achieving a cycle life up to 150 cycles per 50 h, high power density/specific capacity as much as 57.0 mW cm-2/771 mA h g-1, respectively, and excellent coplanar integration capability and mechanical flexibility for working steadily under bending deformation. Eventually, as an additional advancement, an autonomous smartwatch powered by the coplanar integrated OAR-ZABs is demonstrated, which possesses excellent integrity and flexibility and is comfortably wearable for timing and step counting dynamically; this demonstrates the successful application of assembling OAR-ZABs into highly integrated wearable electronics as a compatible micropower source.

中文翻译：

源自具有3D分子结构的钴MOF的N掺杂碳/钴纳米颗粒/ N掺杂碳多层夹层纳米复合物，作为片上固态Zn-空气电池的双功能电催化剂。

具有固有的半开式结构的常规Zn-空气电池中的不令人满意的能量效率和可泄漏的液体电解质极大地限制了它们成为柔性/可穿戴电子设备的安全微功率源的机会。本文中，首先通过精心设计的具有3D分子框架的Co-MOF前驱体的热解合成了N掺杂碳/钴纳米颗粒/ N掺杂碳（NdC-CoNP-NdC）多层夹心纳米杂化物。得益于具有高活性/稳定性的单分散钴纳米颗粒的层间限制生长以及具有高电导率和附加活性位点的千层多孔N自掺杂碳骨架的合理协同设计，从而获得了协同效应。它们之间的多层三明治界面结构，充当互连的纳米反应器，如此获得的NdC-CoNP-NdC多层夹心纳米杂化物表现出出色的双功能催化活性，且ORR / OER间隙较小（0.83 V）。我们遵循平面电极配置设计，其中叉指碳布涂覆有NdC-CoNP-NdC作为空气阴极，叉指Zn箔作为金属阳极，并引入了聚丙烯酰胺-共聚丙烯酸/ 6 M KOH碱性凝胶作为不可燃的固态电解质。因此，进一步开发了片上全固态可充电锌空气电池（OAR-ZAB），其每50小时的循环寿命高达150个循环，高功率密度/比容量高达57.0 mW cm-2 / 771 mA h g-1，并具有出色的共面集成能力和机械柔韧性，可在弯曲变形下稳定工作。最终，作为一项额外的进步，展示了由共面集成OAR-ZAB驱动的自主智能手表，该手表具有出色的完整性和灵活性，并且可以舒适地佩戴以动态地进行计时和步数计数；这证明了将OAR-ZAB组装到高度集成的可穿戴电子设备中作为兼容的微电源的成功应用。

更新日期：2020-02-14

点击分享查看原文

点击收藏

阅读更多本刊新发论文本刊介绍/投稿指南