Ni-doped perovskite PrBaCo2O5+δ as supercapacitor electrode with enhanced electrochemical performance
Introduction
Double perovskite-type composite metal oxides with high conductivity [1], high energy density [2], high oxygen surface exchange coefficient [3], superior chemical stability [4] and low cost [5], have great potential as electrode materials. Now, there are many studies on double perovskite as electrode material. Liu et al. [6] found that layered double perovskite PrBaMnO6 is very suitable as an anion-embedded pseudocapacitor electrode material with specific capacitance exceeds 1000 F g−1. Wang [7] found that PBCO has good capacitance with specific capacity of 428.2 C g−1 and excellent cyclic stability as high as 93% after two thousand cycles. In order to further improve the electrochemical performance of PBCO, obtain more oxygen vacancy [8] seems which can be generated by doping transition metal like Cu [9], Fe [10] and Mn [11] seem to be an effective and efficient way [7].
Herein, we use Ni as the doping element, the as- synthesized double perovskite PrBaCo2-xNixO5+δ (PBCNx) oxides were identified by XRD, XPS, SEM and TEM. Cyclic voltammetry (CV), galvanostatic charge–discharge (GCD) and cycling stability tests were performed in 6 M KOH electrolyte to explore the electrochemical performance of PBCNx and its asymmetric supercapacitor devices. Test results show that double perovskite PBCNx oxides used as electrode material for supercapacitor have high specific capacity and specific capacitance.
Section snippets
Experimental
Sol-gel method was used to prepare double perovskite PBCNx oxide powders. 0.01 mol Pr(NO3)3·6H2O, 0.01 mol Ba(NO3)2, x (x = 0, 0.2, 0.4, and 0.6) mol Ni(NO3)2·6H2O and 0.02-x mol Co(NO3)2·6H2O were dissolved into 350 mL deionized water. 0.04 mol Ethylene Diamine Tetraacetic Acid (EDTA) and 0.08 mol citric acid were added to the mixed solution and stirred at 80 °C for 12 h. The obtained purple gelatum was dried at 150 °C for 12 h. Then the precursor was calcined at 1100 °C for 12 h and ground by
Phase composition, microstructure and surface chemistry
PrBaCo2-xNixO5+δ (x = 0, 0.2, 0.4, 0.6) oxide powders are prepared by a sol–gel method, which are referred to as PBCO, PBCN02, PBCN04, and PBCN06, respectively. For PBCO, PBCN02 and PBCN04 (Fig. 1a), all the peaks correspond well to the peaks in the standard card of the single tetragonal perovskite phase (JCPDS No 53-0131) [12], [13], indicating the successful preparation of PBCNx powders. For the PBCN06 sample, the peak at 30.5° of BaNiO2 (1 1 1) [14] appears to mean excess Ni-doped can obtain a
Conclusions
In this communication, the electrode material PrBaCo2-xNixO5+δ doped with Ni at B site are characterized by XRD and XPS. The electrochemical performance of PBCNx electrode and PBCN04//AC ASC were also analyzed. The results show that the as-synthesized PBCN04 electrode shows excellent electrochemical performance with high specific capacity and specific capacitance which can be a potential material for supercapacitor. Moreover, this synthetic method can be extended to other double perovskite
CRediT authorship contribution statement
Shaohua Zhong: Conceptualization, Methodology, Formal analysis, Visualization. Yuqian Chen: Validation, Investigation, Resources, Writing - original draft. Lan Yang: Writing - review & editing, Data curation, Funding acquisition. Yihui Liu: Supervision, Project administration, Funding acquisition. Xiyong Chen: Supervision. Chao Wang: Project administration.
Declaration of Competing Interest
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Acknowledgements
The project was supported by the National Natural Science Foundation of China (21805217), Open Foundation of Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured Materials, Guangxi University (2021GXYSOF01), 111 Project (B17034) and Innovative Research Team Development Program of Ministry of Education of China (IRT_17R83). XRD and XPS examinations were assisted by the Center of Material Research and Analysis of Wuhan University of Technology.
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