Cr 2 O 3 /rGO nanocomposite with excellent electrochemical capacitive properties
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Cr2O3/rGO nanocomposite with excellent electrochemical capacitive properties Imran Shafi1 · Yuanyue Liu2 · Gaojie Zeng1 · Zijiong Li2 · Baojun Li3 · Erjun Liang1 Received: 23 June 2020 / Accepted: 7 October 2020 © Springer Nature Switzerland AG 2020
Abstract Herein, we have reported the excellent electrochemical capacitive properties of the Cr2O3/rGO nanocomposite synthesized by hydrothermal. After the structural authentication by Raman spectroscopy and XRD studies, the Cr2O3/rGO nanocomposite was probed under different physicochemical techniques. It is found that due to good structural congruity between Cr2O3 nanoplates and rGO, the electrochemical properties of Cr2O3/rGO nanocomposite have strong synergistic effects. As a result, an unprecedented pseudocapacitance of Cr2O3/rGO nanocomposite is revealed at extremely small scan rate (0.1–1.1 mV s−1). At higher scan rate (10–50 mV s−1), the charge/discharge behavior (in CV) of the C r2O3/rGO nanocomposite is found to be oriented towards the ordinary known properties of the commercial Cr2O3 however, the charge storage capacity is still very high. Furthermore, very high theoretical charge storage capacity (93% at 50 mV s−1), high specific capacitance (556 F g−1/310 F g−1 at 0.75 A g−1/1.75 A g−1 (GCD) and 635 F g−1 at 1.1 mV s−1 (CV) respectively) and excellent cyclic retention (92% of the initial value after 3500 cycles) was obtained for the Cr2O3/rGO nanocomposite. The EIS test (Nyquist plot) is in good agreement with the aforementioned results. Keywords Pseudocapacitance · Cr2O3/rGO nanocomposite · Charge storage capacity · CV · GCD
1 Introduction In order to deal with contemporary challenges of increasing demand for electrical energy storage (EES), the development of more efficient, reliable and environmental friendly devices have become need of the hour. Among the available EES devices, batteries and capacitors are of utmost importance. Although, a high energy density is featured by the batteries but they have a couple of drawbacks: a low power density and slow charge rate. On the other hand, capacitors meet many desired properties including faster charge/discharge capability, higher
specific capacitance, higher specific power density and excellent cyclic life [1, 2]. In this context, the supercapacitors have received significant attention in last decade and many different materials have been investigated for supercapacitor application. Generally, on the basis of their working principle and the internal structure, supercapacitors are classified into two major types, electric double-layer capacitors (EDLCs) and pseudocapacitors or faradic capacitors [3]. In EDLCs, energy is stored on the surface of the electrode without chemical reaction taking place while in pseudocapacitors the energy is stored by both the surface controlled processes and reversible faradic reactions [4,
Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42452-020-03636-8) contains supplementary material, which is available to a
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