Catalyst free carbon nanospheres were synthesized using simple one step pyrolysis techniques where biowaste sago bark is used as a carbon precursor. Obtained carbon nanospheres showed porous nature and revealed that more than 95% carbon is present in the synthesized carbon nanospheres with particle size ranging from 40-70 nm. Electrochemical study showed specific capacitance value of 180 Fg -1 at 2 mVs -1 and the cycling stability up to 1700 cycles. Obtained carbon nanospheres are useful in super capacitor applications. Presented study revealed waste to wealth approach thereby reducing waste in the environment.

Porous Carbon Nanoparticles (PCNs) with well-developed microporosity were obtained from bio-waste oil palm leaves (OPL) using single step pyrolysis in nitrogen atmosphere at 500-600 8C in tubefurnace without any catalysis support. The key approach was using silica (SiO 2 ) bodies of OPL as a template in the synthesis of microporous carbon nanoparticles with very small particle sizes of 35-85 nm and pore sizes between 1.9-2 nm.In modern-day scientific applications, porous nanocarbons are ubiquitous and indispensable.

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A single step and simple pyrolysis technique is used to prepare carbon nanospheres (CNSs) from natural biowaste sago hampas in a nitrogen atmosphere without any catalyst. Scanning electron microscope (SEM) images along with transmission electron microscope (TEM) images show evidence of high quality CNSs with a good particle size uniformity. Both X-ray diffraction (XRD) and Raman data show the presence of graphitic characteristic peaks of CNSs. Zeta-potential study reveals that the obtained CNSs can be well dispersed in solution making them suitable for cell imaging applications. The use of biowaste sago hampas is very important from the viewpoint of sustainable synthesis of functional CNSs for the future.