[886]. They have executed the synthesis by pyrolysis of boric acid, urea and activated charcoal with different ratios of boric acid and urea at three different temperatures such as 900, 950 and 1000 °C under N2 atmosphere for 12 h and the subsequent heating at 930 °C for 3 h in ammonia atmosphere. Among the various BCN samples, the sample which has got the maximum SBET of 1991 m 2 g -1 reached the outstanding uptake of CO2 is 64 wt. % at 298 K and 5 MPa. On the other hand, the decrement in the surface area was observed from 1991 to 1853 m 2 g -1 if the pyrolysis was performed at 1000 °C. The stepwise mechanistic processes involved during the pyrolysis of urea, boric acid and activated charcoal are represented as by mixing the boric acid with g-C3N4 for ultrasonication accompanied by the subsequent thermal annealing of the mixture at three various temperatures (600, 700 and 800 °C) for 3 h under inert atmosphere and tested for photoelectrochemical performance . In this report, the g-C3N4 played a triple role and implying that it behaves as a source of carbon and nitrogen as well as sacrificial template. It was observed that with increasing the temperature the content of boron, nitrogen and oxygen enhances but the content of carbon reduces. In another study, the BCN microspheres were obtained by pyrolysis of organic precursor strategy . The organic precursor was produced by polymerisation of BCl3, aniline and ethylene diamine in 1:1:1 molar ratio at 90 °C and the subsequent pyrolysis of precursor and graphite sheet at 1000 °C for 2 h.