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Facile Synthesis of Vertical Layered Double Hydroxides Nanosheets on Co@Carbon Nanoframes as Robust Bifunctional Oxygen Electrocatalysts for Rechargeable Zn–Air Batteries
Small Structures ( IF 13.9 ) Pub Date : 2023-10-05 , DOI: 10.1002/sstr.202300111
Fangfang Chang 1, 2 , Hongnan Du 1, 2 , Panpan Su 1 , Yanhui Sun 3 , Runping Ye 4 , Qiang Tian 1, 2 , Guoxin Zhang 3 , Haitao Li 1 , Jian Liu 1, 5
Affiliation  

The development of efficient and low-cost bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is imperative but remains challenging in rechargeable zinc–air batteries. Herein, a metal oxidation-assisted approach is developed for the facile synthesis of a highly efficient bifunctional catalyst (Co@NC@LDHs) which is composed of layered double hydroxides (LDHs) nanosheets in situ vertically grown on the surface of hollow carbon nanoframes encapsulating Co nanoparticles (Co@NC). Specifically, the vertical LDHs distributing on the carbon surface ensure the maximized number of accessible active sites and the interaction between LDHs with the carbon matrix. The hierarchically structured bifunctional Co@NC@LDHs display an overpotential of 0.33 V at 10 mA cm−2 for OER and a half-wave potential of 0.88 V for ORR. The potential gap (ΔE) of Co@NC@LDHs is calculated to be 0.68 V, outperforming the mixed Pt/C + RuO2 catalysts (ΔE = 0.77 V), manifesting its superior bifunctional electrocatalysis performance. Moreover, the Zn–air batteries based on Co@NC@LDHs electrocatalyst exhibit a high peak power density (185.2 mW cm−2) and excellent durability (5.0 mA cm−2 over 500 h). This work may provide a facile strategy for the fabrication of LDHs on carbon substrate, acting as efficient catalysts for broad energy-related applications.

中文翻译:

在Co@碳纳米框架上轻松合成垂直层状双氢氧化物纳米片作为可充电锌空气电池的鲁棒双功能氧电催化剂

开发用于氧还原反应(ORR)和析氧反应(OER)的高效且低成本的双功能催化剂势在必行,但在可充电锌空气电池中仍然具有挑战性。在此,开发了一种金属氧化辅助方法,用于轻松合成高效双功能催化剂(Co@NC@LDHs),该催化剂由在封装的中空碳纳米框架表面原位垂直生长的层状双氢氧化物(LDHs)纳米片组成。钴纳米颗粒(Co@NC)。具体来说,垂直分布在碳表面的LDHs确保了可接触的活性位点的数量最大化以及LDHs与碳基质之间的相互作用。分层结构的双功能Co@NC@LDHs在10 mA cm -2下显示出0.33 V的OER过电势和0.88 V的ORR半波电势。Co@NC@LDHs的电势差(ΔE )为0.68V,优于混合Pt/C+RuO 2催化剂(ΔE =  0.77V),显示出其优异的双功能电催化性能。此外,基于Co@NC@LDHs电催化剂的锌空气电池表现出高峰值功率密度(185.2 mW cm -2)和优异的耐久性(5.0 mA cm -2超过500小时)。这项工作可能为在碳基底上制造 LDH 提供一种简便的策略,作为广泛能源相关应用的有效催化剂。
更新日期:2023-10-05
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