Self-template synthesis of hollow flower-like NiCo2O4 nanoparticles as an efficient bifunctional catalyst for oxygen reduction and oxygen evolution in alkaline media

IF 6.1 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY Nanotechnology Reviews Pub Date : 2023-01-01 DOI:10.1515/ntrev-2023-0103
Lixiang Fu, Jingling Ma, Zhikang Zhang, Guangxin Wang, Yuliang Liu, Wuhui Li
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Abstract

Abstract A method was proposed to synthesize hollow flower-like NiCo 2 O 4 composed of porous nanosheets using a self-template approach. The unique structure is attributed to the synergistic effect of the Kirkendall effect and the Ostwald ripening mechanism. The sheet-like and porous structure endowed the material with a specific surface area of 137.1 m 2 g −1 and a pore volume of 0.418 cm 3 g −1 . The distinctive structure and high-density active sites imparted excellent catalytic performance in oxygen reduction (ORR) and oxygen evolution (OER) reactions. Electrochemical tests showed that the limit current density of ORR reached 5.58 mA cm −2 , comparable to that of the noble metal Pt/C (20 wt%). The overpotential of OER at a current density of 10 mA cm −2 was only 380 mV, significantly lower than that of the noble metal RuO 2 . These results indicate that the synthesized hollow flower-like NiCo 2 O 4 has the potential to replace noble metals in ORR and OER catalytic applications.
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自模板合成中空花状NiCo2O4纳米颗粒作为碱性介质中氧还原和析氧的高效双功能催化剂
摘要:提出了一种利用自模板法合成多孔纳米片空心花状nico2o4的方法。这种独特的结构归因于Kirkendall效应和Ostwald成熟机制的协同作用。片状多孔结构使材料的比表面积为137.1 m 2 g−1,孔体积为0.418 cm 3 g−1。独特的结构和高密度的活性位点使其在氧还原(ORR)和析氧(OER)反应中具有优异的催化性能。电化学测试表明,ORR的极限电流密度达到5.58 mA cm−2,与贵金属Pt/C的极限电流密度相当(20% wt%)。在电流密度为10 mA cm−2时,OER的过电位仅为380 mV,明显低于贵金属若o2。这些结果表明,合成的空心花状nico2o4在ORR和OER催化应用中具有取代贵金属的潜力。
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来源期刊
Nanotechnology Reviews
Nanotechnology Reviews CHEMISTRY, MULTIDISCIPLINARY-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
11.40
自引率
13.50%
发文量
137
审稿时长
7 weeks
期刊介绍: The bimonthly journal Nanotechnology Reviews provides a platform for scientists and engineers of all involved disciplines to exchange important recent research on fundamental as well as applied aspects. While expert reviews provide a state of the art assessment on a specific topic, research highlight contributions present most recent and novel findings. In addition to technical contributions, Nanotechnology Reviews publishes articles on implications of nanotechnology for society, environment, education, intellectual property, industry, and politics.
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