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Urine to highly porous heteroatom-doped carbons for supercapacitor: A value added journey for human waste
- Urine to highly porous heteroatom-doped carbons for supercapacitor: A value added journey for human waste
- Razmjooei, Fatemeh; Singh, Kiranpal; Kang, Tong Hyun; Chaudhari, Nitin; Yuan, Jinliang; Yu, Jong-Sung
- DGIST Authors
- Razmjooei, Fatemeh; Singh, Kiranpal; Kang, Tong Hyun; Yu, Jong-Sung
- Issue Date
- Scientific Reports, 7
- Article Type
- Electrocatalytic Oxygen Reduction; Electrode Material; Energy Storage; Functionalized Graphene; High Performance Supercapacitor; High Surface Area; Ordered Mesoporous Carbon; Power Density; Solid State Supercapacitors
- Obtaining functionalized carbonaceous materials, with well-developed pores and doped heteroatoms, from waste precursors using environmentally friendly processes has always been of great interest. Herein, a simple template-free approach is devised to obtain porous and heteroatom-doped carbon, by using the most abundant human waste, ""urine"". Removal of inherent mineral salts from the urine carbon (URC) makes it to possess large quantity of pores. Synergetic effect of the heteroatom doping and surface properties of the URC is exploited by carrying out energy storage application for the first time. Suitable heteroatom content and porous structure can enhance the pseudo-capacitance and electric double layer capacitance, eventually generating superior capacitance from the URC. The optimal carbon electrode obtained particularly at 900 degrees C (URC-900) possesses high BET surface area (1040.5 m(2)g(-1)), good conductivity, and efficient heteroatom doping of N, S, and P, illustrating high specific capacitance of 166 Fg(-1) at 0.5 Ag-1 for three-electrode system in inorganic electrolyte. Moreover, the URC-900 delivers outstanding cycling stability with only 1.7% capacitance decay over 5,000 cycles at 5 Ag-1. Present work suggests an economical approach based on easily available raw waste material, which can be utilized for large-scale production of new age multi-functional carbon nanomaterials for various energy applications.
- Nature Publishing Group
- Related Researcher
Yu, Jong Sung
Light, Salts and Water Research Group
Materials chemistry; nanomaterials; electrochemistry; carbon and porous materials; fuel cell; battery; supercapacitor; sensor and photochemical catalyst
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