Self-Assembly of Hausmannite Mn₃O₄ Triangular Structures on Cocosin Protein Scaffolds for High Energy Density Symmetric Supercapacitor Application

Abstract

Recent advances in using biological scaffolds for nanoparticle synthesis have proven to be useful for preparing various nanostructures with uniform shape and size. Proteins are significant scaffolds for generating various nanostructures partly because of the presence of many functional groups to recognize different chemistries. In this endeavor, cocosin protein, an 11S allergen, is prepared from coconut fruit and employed as a potential scaffold for synthesizing Mn3O4 materials. The interaction between protein and manganese ions is studied in detail through isothermal calorimetric titration. At increased scaffold availability, the Mn3O4 material adopts the exact hexamer structure of the cocosin protein. The electrochemical supercapacitive properties of the cocosin–Mn3O4 material are found to have a high specific capacitance of 751.3 F g–1 at 1 A g–1 with cyclic stability (92% of capacitance retention after 5000 CV cycles) in a three-electrode configuration. The Mn3O4//Mn3O4 symmetric supercapacitor device delivers a specific capacitance of 203.8 F g–1 at 1 A g–1 and an outstanding energy and power density of 91.7 W h kg–1 and 899.5 W kg–1, respectively. These results show that cocosin–Mn3O4 could be considered a suitable electrode for energy storage applications. Moreover, the cocosin protein to be utilized as a novel scaffold in protein–nanomaterial chemistry could be useful for protein-assisted inorganic nanostructure synthesis in the future.

Highly Efficient Solvothermal Synthesis of Poly(1,5-diaminoanthraquinone) Nanoflowers for Energy and Environmental Applications

“…The excellent cyclic stability was ascribed to the stable chemical structure of PDAA and its high crystallinity with the proposed solvothermal chemically oxidative polymerization . Increasing the scan rate, the contribution ratio of capacitive increased from 51.6 to 82.1% (Figure S11), and the b value was fitted as 0.87, indicating that the charge storage mechanism was largely controlled by the capacitive process …”

“…31 Increasing the scan rate, the contribution ratio of capacitive increased from 51.6 to 82.1% (Figure S11), and the b value was fitted as 0.87, indicating that the charge storage mechanism was largely controlled by the capacitive process. 35 Finally, the flexible symmetric solid-state supercapacitors were fabricated with the PDAA/rEGO electrode to assess their potential in practical application. There was no obvious change between the CV curves at different scan rates (Figure 5a), meaning efficient electronic and ionic transport in the composite film electrode because of the porous conductive framework.…”

Triethanolamine assisted synthesis of bimetallic nickel cobalt nitride/nitrogen-doped carbon hollow nanoflowers for supercapacitor

“…To gain further insight into the electrochemical reaction kinetics of Ni 3 N-Co 2 N 0.67 /NC, the capacitive contribution was calculated according to the following Eq. [48] :…”

Virtual Issue: Electrode Interfaces

“…Within this Virtual Issue, notable contributions shine a spotlight on (1) promising electrode materials and exploring a few of the diverse roles that interfaces play in various electrochemical applications, such as water splitting and gas evolution, − biosensors, − and supercapacitors; − (2) mechanistic studies that aim to deepen our fundamental understanding of the electrode/electrolyte interface; − and (3) new and exciting methods and technologies. − This comprehensive approach seeks to make substantial contributions to the fields of energy conversion, energy storage, and sensing.…”

“…21 Supercapacitors are also in vogue. We report advances in the sustainable synthesis of biomass-derived porous carbon spheres, 22 the first synthesis of Mn 3 O 4 nanoarchitectures with a biological scaffold of cocosin protein, used in a symmetric supercapacitor, 23 cobalt manganese phosphate thin films as binder-free cathodes in hybrid supercapacitors, 24 overreduction synthesis of mixed-valent manganese oxides to be used in asymmetric supercapacitors, 25 binder-free, a manganese−nickel oxide nanofiber in a carbon shell for asymmetric supercapacitors, 26 and an interfacial method to prepare semiconductive polymer films with aromatic moieties for microsupercapacitors. 27 Langmuir retains a strong commitment to reporting mechanistic studies.…”