Abstract
The development of sustainable electrochemical energy storage devices faces a great challenge in exploring highly efficient and low-cost electrode materials. Biomass waste-derived carbonaceous materials can be used as an alternative to expensive metals in supercapacitors. However, their application is limited by low performance. In this study, the combination use of persimmon waste-derived carbon and transition metal nitride demonstrated strong potential for supercapacitor application. Persimmon-based carbonaceous gel decorated with bimetallic nitride (N-NiCo/PC) was firstly synthesized through a green hydrothermal method. Electrochemical properties of N-NiCo/PC electrode in 6 M KOH electrolyte solution were evaluated using cyclic voltammetry (CV) and charge–discharge measurements. The N-NiCo/PC exhibited 320 F/g specific capacitance at 1 A/g current density and maintained 91.4% capacitance retention after 1500 cycles. Additionally, it exhibited a high energy density of 29.44 Wh/kg at 1000 W/kg power density and sustained 5.5 Wh/kg energy density even at a power density of 10,000 W/kg. Hence, the bimetallic nitride-based composite catalyst is a potentially suitable material for high-performance energy storage devices. In addition, this work demonstrated a promising pathway for transforming environmental waste into sustainable energy conversion materials.
Highlights
There is a need to protect natural resources and control energy consumption because of global warming
The energy demand can be attained in the direction of unconventional sustainable and renewable energy devises[1], like fuel cells [2,3,4,5], batteries[6], and supercapacitors[7] that convert chemically stored energy into electrical energy through electrochemical reactions
Supercapacitor performance based on the electrode material selection, the material having large specific surface area and good electrical conductivity is considered suitable for highperformance supercapacitor [10,11]
Summary
There is a need to protect natural resources and control energy consumption because of global warming. The energy demand can be attained in the direction of unconventional sustainable and renewable energy devises[1], like fuel cells [2,3,4,5], batteries[6], and supercapacitors[7] that convert chemically stored energy into electrical energy through electrochemical reactions Among these different technologies, the supercapacitor has received great attention because of its high-power density, good cycle stability, fast storage capacity, and excellent operational safety[8]. Fabrication of energy storage devices largely depends on abundant electrode material resources, economical, eco-friendly, and sustainable manufacturing These well-designed carbons are usually complex to synthesize, costly, and agglomeration are obstacles in their applied application. It has become a key issue to explore economical and effective electrode materials with excellent electrochemical performance In this regard, biomass-based hydro-aerogels are a good candidate in energy storing systems. The use of bimetallic PG along with nitride providing a renewable green-synthetic method for high-performance supercapacitor
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