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  • It is well known that

    2019-11-19

    It is well known that, nanostructured transition metal oxides are the most promising candidates as electrode for pseudocapacitors due to their attractive properties such as environmentally friendly, high theoretical capacitance, low cost and easily abundant [15], [16]. Numerous investigations have been made so far on transition metal oxides such as MnO2 [17], Co3O4 [18], NiO [19], V2O5 [20], ZnO [21], TiO2 [22] and MoO3 [23] in order to utilize them as pseudocapacitor electrodes in recent years. Nevertheless, transition metal oxides are having few limitations such as poor electrical conductivity, poor electrochemical stability and lower ion triclabendazole rates, which restrict their practical applications [24]. On the other hand, binary metal oxides such as NiCo2O4 [25], ZnCo2O4 [26], NiMoO4 [27], MnMoO4 [28], CoMoO4 [29] and SnMoO4 [30] have been employed as alternative electrode materials in order to address the aforementioned issues, owing to the multiple oxidation states for redox reactions and thus, leading to an increase in the specific capacitance as well as electrical conductivity. Among these, bismuth molybdate (Bi2MoO6) is a potential candidate because of its excellent electrical and optical properties, which is generally used in photo catalytic applications [31]. Recently, some interesting investigations have been reported on bismuth molybdate as pseudocapacitive electrode materials [32], [33]. Additionally, Qi. et al. [34] reported that, Bi2MoO6 nanosheet arrays possess a specific capacitance of 37.3 F g−1 at the current density of 2 A g−1 in an aqueous 1 M KCl electrolyte solution. In our previous work, we have reported octahedron-like bismuth molybdate (Bi3.64 Mo0.36 O6.55) prepared via DNA mediated sonochemical approach, which delivers a specific capacitance of 641 Fg−1 at a scan rate of 5 mV s−1 [35]. Therefore, many researchers have been focusing on suitably modifying bismuth molybdate electrode materials by adding bio-molecules as templates, etc., in order to increase their specific capacitance and other electrochemical properties for supercapacitor applications. Precursor templates have been widely used for the preparation of metal oxides, which may provide porous and well-defined nanostructured metal oxides via crystallographic transformations [36]. Likewise, bio-molecules such as amino acids, proteins and peptides have also been employed as templates, thereby forming the most important basic building block with attractive structural features and self-assembling functions too [37], [38]. Among them, deoxyribonucleic acid (DNA) bio-polymer is arguably one of the most appropriate templates, as it possesses exceptional material assembling properties including distinct polymeric sequence, chemical structure and negatively charged DNA sites, which may tend to create well-defined inorganic and organic nanostructures [39], [40]. Hence, DNA-templated inorganic nanostructured metal oxides have been considered for various applications. Recently, Zhu et al. [41] successfully obtained hydroxyapatite nanosheet assembled porous hollow microspheres by DNA-templated hydrothermal method, which exhibited a remarkable performance for the function of drug delivery and protein adsorption and release. Kundu et al. [42] prepared wire, flake and flower-like ZnO nanostructures via microwave heating process in the presence of DNA, which showed excellent catalytic and dye sensitized solar cell performances. Dong et al. [43] prepared copper nanoparticles by DNA templated synthesis method for aptamer sensor applications. Interestingly, many other reports also involving use of DNA as a template to obtain well-defined nanostructures [44], [45], [46]. A careful evaluation appears to suggest that there is no report on DNA-templated Bi2MoO6 nanoplates synthesized by hydrothermal method for psuedocapacitor applications. Moreover, hydrothermal process is known as a simple, cost-effective and short-time synthesis technique for the preparation of Bi2MoO6 nanoplates.