Recent progress in ZnCo₂O₄and its composites for energy storage and conversion: a review

Abstract

Transition metal oxides have attracted growing interest for application in energy storage and conversion technologies. In special, spinel-based materials, such as ZnCo2O4, exhibit structures suitable for performing as multifunctional electrodes...

Influence of the Molar Ratio of Co and V in Bimetallic Oxides on Their Pseudocapacitive Properties

“…In fact, even at a slow scan rate of 0.5 mV s –1 , the percentage of total charge resulted from surface-controlled capacitive processes is greater than 55% for all samples (see Figure S8), which could be attributed to an amorphous structural disorder and interconnected particles produced on the surface of the oxides during synthesis . In addition, the excellent pseudocapacitive charge storage with a fast charge/discharge process could be attributed to highly reversible redox reactions, shorter ion diffusion lengths, and continuous access to electroactive sites . Therefore, the storage mechanism in Co–V oxide materials is Faradaic in nature with a considerable pseudocapacitive behavior.…”

“… 42 In addition, the excellent pseudocapacitive charge storage with a fast charge/discharge process could be attributed to highly reversible redox reactions, shorter ion diffusion lengths, and continuous access to electroactive sites. 43 Therefore, the storage mechanism in Co–V oxide materials is Faradaic in nature with a considerable pseudocapacitive behavior.…”

All-redox hybrid supercapacitors based on carbon modified stacked zinc cobaltite nanosheets

“…12(a) represents the cycling performance of Table 3 provides a comparison of some recently reported ZnCo 2 O 4 -based HSCs with carbonaceous materials as negative electrodes with our results. 69 Most of the previous reports used activated carbon as the negative electrode for the fabrication of asymmetric SCs. The use of a faradaic negative electrode can provide a new opportunity for the development in the eld of advanced HSCs.…”

Emerging high-entropy coordination compounds and their derivatives for energy application

“…In this regard, hybrid supercapacitors can be considered an interesting choice since they combine the outstanding power density of supercapacitive electrode materials with the high-energy density of battery-type materials into a single device. 5 Furthermore, the development of electrode materials for the new generation of sodium-ion batteries (SIBs), as well as the design of redox mediators/catalysts to enhance the performance of lithium-sulfur materials (LSBs) are challenges yet to be overcome. On the other hand, the design of robust and high performance electrocatalysts is an emerging challenge.…”

“…In this sense, the development of low-cost and abundant electrode materials capable of using solar energy and/ or electricity to promote the tetra-protonic and tetra-electronic reaction mechanism of the oxygen evolution reaction (OER), hydrogen evolution reaction (HER) or electrochemical CO 2 reduction reaction (CO 2 RR) is in the midst of main objectives of materials chemistry and nanotechnology. 4,5 Among recent advances in the development of promising materials for energy technologies, high-entropy materials (HEMs) have attracted increasing attention due to their distinctive designing concept and unique properties. 6 HEMs generally consist of ve or more elements incorporated together to form a single solid solution, 7 with atomic concentrations ranging from 5% to 35%.…”