Self-templated and triethanolamine-induced hollow MnO2 nanoboxes with abundant active Mn3+ and oxygen vacancies for high-performance Na-ion pseudocapacitors

Ling，Jingzhou1; Gao，Aimei1,2; Huang，Yulan3,4; Yi，Fenyun1,2; Li，Qizhi1; Wang，Gengyi1; Liu，Yiqin1; Shu，Dong1,2

2023-01-15

10.1016/j.cej.2022.139661

CHEMICAL ENGINEERING JOURNAL   Impact Factor & Quartile

1385-8947

1873-3212

The electrochemical performance of MnO is limited by its low surface area, sluggish kinetics, and poor stability. Herein, hollow MnO nanoboxes (H-MnO-TEA) are successfully prepared using Prussian blue analogs (KMn[FeCN], Mn-PBA) via a facile triethanolamine-induced strategy to tackle the abovementioned hurdles. Mn-PBA not only acts as a self-sacrificial template, but also triggers the “self-redox reaction” to in-situ form MnO, in which the dissociated [FeCN] oxidates Mn in the alkalic medium. Besides, triethanolamine is employed as an intermediate modulator to induce the formation of hollow MnO and adjust the coordination environment of H-MnO-TEA. Experimental results and DFT calculations demonstrate that abundant active Mn and oxygen vacancies in H-MnO-TEA are beneficial to providing more active sites, improving electrical conductivity, and boosting Na diffusion kinetics. Based on the improved structural and electrical properties, H-MnO-TEA delivers a high specific capacitance of 316.8 F g at 0.5 A g, superior rate performance, and excellent capacitive retention of 96.1 % after 10,000 cycles. This work provides an efficient way to construct hollow metal oxides for high-performance energy storage devices along with their underlying mechanism.

Hollow MnO2 Mn-PBA derivative Oxygen vacancies Self-template strategy Supercapacitor

SCI

English

Corresponding

[2022A1515011906] ; [202208]

Engineering

Engineering, Environmental ; Engineering, Chemical

WOS:000888969700001

ELSEVIER SCIENCE SA

ENGINEERING

2-s2.0-85139728549

Scopus

1.School of Chemistry,South China Normal University,Guangzhou,510006,China
2.National and Local Joint Engineering Research Center of MPTES in High Energy and Safety LIBs,South China Normal University,Guangzhou,510006,China
3.Joint Key Laboratory of the Ministry of Education,Institute of Applied Physics and Materials Engineering,University of Macau,Taipa,Avenida da Universidade,999078,Macao
4.Department of Materials Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong Province,518055,China

Ling，Jingzhou,Gao，Aimei,Huang，Yulan,et al. Self-templated and triethanolamine-induced hollow MnO2 nanoboxes with abundant active Mn3+ and oxygen vacancies for high-performance Na-ion pseudocapacitors[J]. CHEMICAL ENGINEERING JOURNAL,2023,452.

Ling，Jingzhou.,Gao，Aimei.,Huang，Yulan.,Yi，Fenyun.,Li，Qizhi.,...&Shu，Dong.(2023).Self-templated and triethanolamine-induced hollow MnO2 nanoboxes with abundant active Mn3+ and oxygen vacancies for high-performance Na-ion pseudocapacitors.CHEMICAL ENGINEERING JOURNAL,452.

Ling，Jingzhou,et al."Self-templated and triethanolamine-induced hollow MnO2 nanoboxes with abundant active Mn3+ and oxygen vacancies for high-performance Na-ion pseudocapacitors".CHEMICAL ENGINEERING JOURNAL 452(2023).