## 1 Introduction  
Various efforts have been undertaken to solve the energy issue, as the energy required in our daily lives is still totally dependent on fossil fuels, which causes environmental issues. Therefore, various types of the alternative energy windows have been explored in the search to develop an energy storage device which can provide enough power to fulfill our daily living requirements related to energy, as our most of human activities depend on energy. For this purpose, electrochemical abased energy conversion systems have received much attention, especially supercapacitors, which could provide a large amount of power density compared to batteries in short periods of time. Therefore, various efforts have been focused on developing efficient energy devices based on the supercapacitor [1; 2; 3; 4; 5]. There are four main parts in the capacitor, including the electrode, which is the most important part of the any energy device [6; 7; 8; 9; 10]. The electrode provides the device with the capability to store the charge and provide enough stability during the charge-discharge process. Various materials, such as carbon-based electrode materials, have been used to develop double layer-based supercapacitor devices, whereas metal oxide/hydroxide has been used to develop pseudocapacitive devices. Pseudocapacitive materials have been proven to be excellent specific capacitance materials, as their charge storing mechanisms are dependent on the oxidation and reduction processes over the electrode's surface [11; 12]. Among all the transition metal oxides, cobalt-based oxide and hydroxide carbonates have received much attention owing to their sufficient electrical conductivity, easy preparation method, controllable morphology, and easy control of the interaction between positively and negatively charged layers during the layer metal hydroxides [1; 2; 3; 4; 5]. Layered metal hydroxides consist of a large and familiar group of inorganic compounds which have two branches; layered double hydroxides (LDHs) and hydroxyl double salt (HDS). Similar key structural features are observed for both LDHs and HDS. They consist of positively charged nanolayers and interlayered anions for charge balancing, but their nanolayers' compositions are different. LDHs contain a mixture of divalent and trivalent or tetravalent cations [13; 14; 15], while HDS have only divalent cations [16; 17; 18]. Recently, because of the high regulation of dominant compositions without the structure transformation of both LDHs and HDS, their wide applications were effective in the field of supercapacitors as battery-type materials. Transition metal carbonate hydroxides are considered promising scalable and effective alternatives with supercapacitors behaviors because of their ability to supply multiple redox activities and their relatively high electrical conductivity. Though large theoretical specific capacitance values have been observed for the most metal hydroxides, their supercapacitors could be further improved by combining different metal cations into a host. In this trend, by incorporating various metal cations with the mono-metallic-based carbonate hydroxides, more redox reaction sites and higher electrical conductivity were observed for their composites. Thus, eventually, the electrochemical performance of these composites improved because of their synergistic effects [19; 20]. For example, CoNiDH and Co\({}_{3}\)O\({}_{4}\)-CoNi-LDH are some of the most auspicious fictional materials for electrochemical applications such as electrocatalysis, Li-ion batteries and supercapacitors [19; 20]. Apart from these, NiAl/LDH, MnCo/LDH and CoNi/LDH have widely studied with the aim of constructing efficient electrode materials for supercapacitors applications. Thus, double metal hydroxide materials are attracting increased attention in the field of supercapacitor electrode material research. However, their practical utilization is still limited by their relatively poor rate capability and cyclic retention [21].