Prospect of Ni-related metal oxides for high-performance supercapacitor electrodes
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Prospect of Ni-related metal oxides for highperformance supercapacitor electrodes Yifeng Lin1, Shuo Zhang1, Lixiu Guan2,*, and Junguang Tao1,* 1 2
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, China School of Science, Hebei University of Technology, Tianjin 300401, China
Received: 31 July 2020
ABSTRACT
Accepted: 29 September 2020
Nowadays, supercapacitors become one of the most promising energy-storage systems owing to their high power density, fast charging–discharging rate, and long cyclic stability. Among many supercapacitor materials, nickel-based oxides are a class of promising candidates with high specific capacities. However, the research on these materials has demonstrated that there are some deficiencies that need to be improved, such as their low conductivity, volume shrinkage/expansion during the working process, and moderate cycle stability. It is of urgent to find a suitable method to solve these issues. In this review, we show that multifunctional structures, such as specific core–shell structures, complex formed with metal–organic frameworks, and three-dimensional micro–nanostructures, as well as multi-valence ion doping are practical techniques to boost the supercapacitor performance of these materials. We summarize some recent work related to this topic and emphasize the importance of the synergic effect and electronic doping on the electrochemical supercapacitance of the metal oxides, hoping to provide constructive significance for the future research and development on these materials.
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Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction With the rapid progress and development of the society, the tremendous exhaustion of fossil fuels has led to severe energy crisis and increasingly serious environmental pollution issues [1–3]. The need for efficient energy storage and clean energy alternatives is one of the prime concerns in the modern society
which can be fulfilled by the applications of energy storage devices such as electrochemical supercapacitors (SCs), rechargeable batteries, and fuel cells [4–15]. The rechargeable batteries are mainly depending on intercalation and de-intercalation of cations, which is a relative slow process and limits their power density. On the other hand, the SCs furnish much greater power density because most of their energy storage reactions are experienced on the
Handling Editor: Kyle Brinkman.
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https://doi.org/10.1007/s10853-020-05408-6
J Mater Sci
outer layers of the electrodes. So far, SCs have attracted increasing attentions due to their long cycling lifetime, wide working temperature range, fast charging rate, and high power density [9, 16], which also bridge the power/energy gap between traditional dielectric capacitors and batteries/fuel cells. As shown in Fig. 1, the number of publications on SCs is increasing exponentially in the past decade, which shows that the research upsurge in this field
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