<br>双功能配体钴金属有机骨架衍生的异质结构钴基纳米复合材料作为可充电锌空气电池的氧电催化剂,Journal of Colloid and Interface Science

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双功能配体钴金属有机骨架衍生的异质结构钴基纳米复合材料作为可充电锌空气电池的氧电催化剂
Journal of Colloid and Interface Science ( IF 9.4 ) Pub Date : 2024-03-07 , DOI: 10.1016/j.jcis.2024.03.040
Xiaoying Xie ₁ , Zeyu Zhai ₁ , Weiwei Cao ₁ , Jiamin Dong ₁ , Yushan Li ₁ , Qiusai Hou ₁ , Guixiang Du ₁ , Jiajun Wang ₁ , Li Tian ₁ , Jingbo Zhang ₁ , Tierui Zhang ₂ , Lu Shang ₃

Affiliation

合理构建高效、稳健的双功能氧电催化剂是可充电锌空气电池（ZAB）广泛应用的关键，但同时也是一项挑战。在此，首先探索了双功能配体Co金属有机框架，通过一步热解方法制备了锚定在富含CoN位点的碳基底上的异质结构CoO/Co纳米粒子的杂化物（CoO/Co@CoNC）。这种独特的异质结构提供了丰富的CoN和CoO/Co活性位点，分别驱动氧还原反应（ORR）和析氧反应（OER）。此外，它们的积极协同作用促进电子转移并优化电荷/质量传输。因此，所获得的 CoO/Co@CoNC 表现出优异的 ORR 活性，比 Pt/C 具有更高的 0.88 V 半波电位（0.83 V vs. RHE），并且具有相当的 OER 性能，在 10 mA 下的过电位为 346 mV cm 至商业 RuO。使用CoO/Co@CoNC作为阴极催化剂组装的ZAB显示出168.4 mW cm的最大功率密度，以及在5 mA cm下超过250小时的优异充放电循环性能。这项工作凸显了异质结构在氧电催化方面的巨大潜力，并为设计可充电 ZAB 的高效双功能氧催化剂提供了新途径。

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Bifunctional ligand Co metal-organic framework derived heterostructured Co-based nanocomposites as oxygen electrocatalysts toward rechargeable zinc-air batteries

Rational construction of efficient and robust bifunctional oxygen electrocatalysts is key but challenging for the widespread application of rechargeable zinc-air batteries (ZABs). Herein, bifunctional ligand Co metal–organic frameworks were first explored to fabricate a hybrid of heterostructured CoO/Co nanoparticles anchored on a carbon substrate rich in CoN sites (CoO/Co@CoNC) via a one-step pyrolysis method. Such a unique heterostructure provides abundant CoN and CoO/Co active sites to drive oxygen reduction reaction (ORR) and oxygen evolution reaction (OER), respectively. Besides, their positive synergies facilitate electron transfer and optimize charge/mass transportation. Consequently, the obtained CoO/Co@CoNC exhibits a superior ORR activity with a higher half-wave potential of 0.88 V than Pt/C (0.83 V vs. RHE), and a comparable OER performance with an overpotential of 346 mV at 10 mA cm to the commercial RuO. The assembled ZAB using CoO/Co@CoNC as a cathode catalyst displays a maximum power density of 168.4 mW cm, and excellent charge–discharge cyclability over 250 h at 5 mA cm. This work highlights the great potential of heterostructures in oxygen electrocatalysis and provides a new pathway for designing efficient bifunctional oxygen catalysts toward rechargeable ZABs.

更新日期：2024-03-07

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