Vacancy-engineered CeO2/Co heterostructure anchored on the nitrogen-doped porous carbon nanosheet arrays vertically grown on carbon cloth as an integrated cathode for the oxygen reduction reaction of rechargeable Zn-air battery
Vacancy-engineered CeO2/Co heterostructure anchored on the nitrogen-doped porous carbon nanosheet arrays vertically grown on carbon cloth as an integrated cathode for the oxygen reduction reaction of rechargeable Zn-air battery
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空位设计的 CeO2/Co 异质结构锚定在碳布上垂直生长的氮掺杂多孔碳纳米片阵列上，作为可充电锌空气电池氧还原反应的集成阴极
DOI：
10.1039/d2ta01188c
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发表时间：
2022-03-30
影响因子：
11.9
通讯作者：
An, Baigang
中科院分区：
文献类型：
--
作者：
Li, Shuxin;Zhang, Han;An, Baigang
可充电锌空气电池（ZAB）具有能量密度高、安全性好、环境友好等优点，被认为是一种很有前途的储能装置。然而，用于改善ZAB的空气阴极的缓慢氧反应动力学的非贵金属催化剂的开发仍然存在挑战。本文以金属有机骨架（MOF）为前驱体，采用简单的碳化-水解工艺，在CeO 2/Co异质结构修饰的碳布（Co/CeO 2-NCNA@CC）上垂直生长了氮掺杂的多孔碳纳米片阵列。CeO 2纳米颗粒的尺寸可以通过独特的水解作用控制在平均直径约6.0 nm，形成具有Co物种的异质结构，并均匀分散在氮掺杂的多孔碳纳米片阵列（NCNA）表面。垂直生长在碳布（CC）上的NCNA具有改善的润湿性，并允许CeO 2/Co异质结构易于接近。CeO 2中丰富的本征氧空位使催化剂在氧还原反应（ORR）和析氧反应（OER）过程中具有优异的调节氧浓度的能力。电极的完整性加速了电子从活性位点到CC集电器的转移。因此，使用Co/CeO 2-NCNA@CC作为集成阴极的ZAB对ORR和OER表现出令人印象深刻的电催化性能。以Co/CeO 2-NCNA@CC为阴极的ZAB在5.0 mA cm（-2）下运行380 h后，开路电压为1.47 V，供电容量为784.4 mA h g（Zn）（-1），超过了商业Pt/C + RuO 2催化剂和大多数报道的催化剂。
A rechargeable zinc-air battery (ZAB) is regarded as a promising energy storage device owing to its high energy density, good safety, and environmental friendliness. However, the development of non-precious metal catalysts for improving the sluggish oxygen reaction kinetics of the air cathode of ZAB still presents a challenge. Herein, nitrogen-doped porous carbon nanosheet arrays vertically grown on carbon cloth decorated with CeO2/Co heterostructure (Co/CeO2-NCNA@CC) as an integrated cathode have been successfully constructed using a facile carbonization-hydrolysis procedure using a metal-organic framework (MOF) as a precursor. The size of CeO2 nanoparticles can be controlled with an average diameter of about 6.0 nm through unique hydrolysis to form the heterostructure with Co species, which are uniformly dispersed on the surface of nitrogen-doped porous carbon nanosheet arrays (NCNA). NCNA vertically grown on carbon cloth (CC) has improved wettability and allows for the CeO2/Co heterostructure to be easily accessible. The abundant intrinsic oxygen vacancies in CeO2 bring the catalyst an excellent ability to tune the oxygen concentration during the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) processes. The integrity of the electrode accelerates the transfer of electrons from the active sites to the CC current collector. Therefore, ZAB using Co/CeO2-NCNA@CC as the integrated cathode exhibits an impressive electrocatalytic performance toward both ORR and OER. The ZAB with Co/CeO2-NCNA@CC cathode has an open-circuit voltage of 1.47 V and supply capacity of 784.4 mA h g(Zn)(-1) even after 380 h operation at 5.0 mA cm(-2), which surpasses the catalysts of commercial Pt/C + RuO2 and the most reported catalysts.