Polyoxometalate-Based Metal-Organic Frameworks with Conductive Polypyrrole for Supercapacitors

Hai-Ning Wang; Mi Zhang; A-Man Zhang; Feng-Cui Shen; Xiao-Kun Wang; Sheng-Nan Sun; Yong-Jun Chen; Ya-Qian Lan

doi:10.1021/acsami.8b12194

Polyoxometalate-Based Metal-Organic Frameworks with Conductive Polypyrrole for Supercapacitors

ACS Appl Mater Interfaces. 2018 Sep 26;10(38):32265-32270. doi: 10.1021/acsami.8b12194. Epub 2018 Sep 13.

Authors

Hai-Ning Wang^{1

2}, Mi Zhang², A-Man Zhang², Feng-Cui Shen², Xiao-Kun Wang², Sheng-Nan Sun², Yong-Jun Chen², Ya-Qian Lan²

Affiliations

¹ School of Chemistry and Chemical Engineering , Shandong University of Technology , Zibo , Shandong 255049 , P. R. China.
² Jiangsu Collaborative Innovation Centre of Biomedical Functional Materials, Jiangsu Key Laboratory of New Power Batteries, College of Chemistry and Materials Science , Nanjing Normal University , Nanjing , 210023 , P. R. China.

PMID: 30175579
DOI: 10.1021/acsami.8b12194

Abstract

Metal-organic frameworks (MOFs) with high porosity could act as an ideal substitute for supercapacitors, but their poor electrical conductivities limit their electrochemical performances. In order to overcome this problem, conductive polypyrrole (PPy) has been introduced and a novel nanocomposite resulting from polyoxometalate (POM)-based MOFs (NENU-5) and PPy has been reported. It comprises the merits of POMs, MOFs, and PPy. Finally, the highly conductive PPy covering the surfaces of NENU-5 nanocrystallines can effectively improve the electron/ion transfer among NENU-5 nanocrystallines. The optimized NENU-5/PPy nanocomposite (the volume of Py is 0.15 mL) exhibits high specific capacitance (5147 mF·cm^-2), larger than that of pristine NENU-5 (432 mF·cm^-2). Furthermore, a symmetric supercapacitor device based on a NENU-5/PPy-0.15 nanocomposite possesses an excellent areal capacitance of 1879 mF·cm^-2, which is far above other MOF-based supercapacitors.

Keywords: conductive polypyrrole; polyoxometalate; polyoxometalate-based metal−organic frameworks; supercapacitor; synergetic effect.