Simple fabrication of Co₃O₄ nanoparticles on N-doped laser-induced graphene for high-performance supercapacitors

Abstract

Simultaneous decoration of Co3O4 nanoparticles and heteroatom doping on laser-induced graphene based on a duplicate pyrolysis method for supercapacitor applications.

Polymer-assisted synthesis of Co3O4/CoO microballs decorated N-doped carbon for symmetric supercapacitor

“…The D band defines the presence of structural disorders and defects, and the G band defines the graphitic domains in the carbon framework. 2 The Co–NC1 composite showed the bands at 485 and 620 cm −1 , corresponding to E g and A 1g modes indicating the presence of the Co 3 O 4 phase, the band at 505 cm −1 indicates the presence of CoO phase, and bands at 1434, 1530, and 1591 cm −1 correspond to D, G, and D′ bands of carbon materials, which confirm the presence of N-doped carbon in the composite. 27 The Co–NC2 composite showed the bands at 490, 505, and 585 cm −1 corresponding to E g and A 1g modes and the other bands at 1356, 1521, and 1616 cm −1 correspond to D, G, and D′ bands, respectively, confirming the formation of N-doped carbon.…”

“…6(e)). 2 The shift towards lower binding energy observed in C 1s, N 1s, O 1s, and Co 2p spectrum in Co–NC2 with respect to pristine g-C 3 N 4 and CoC300 may be because of the integration of Co 3 O 4 /CoO on the surface of N-doped carbon. The above results confirm the formation of Co 3 O 4 /CoO and N-doped carbon in the composite.…”

“…The larger integral area of the CoC300 sample may be due to the presence of two different phases of Co 3 O 4 and CoO, which leads to better conductivity. 2 Fig. 7(b) shows the cyclic voltammetry of g-C 3 N 4 at the potential window of −0.6 V to 0 V. The g-C 3 N 4 electrode exhibits a quasi-rectangular type curve indicating the electrical double layer capacitive behaviour at the scan rate of 10 mV s −1 .…”

“…3 The redox peaks of Co–NC2 correspond to the reaction between different oxidation states of cobalt. 2,8 The Co 3 O 4 /CoO shows the obvious redox peaks indicating the pseudocapacitive behavior. The possible energy storage mechanism is,CoO + OH − ↔ CoOOH + e − Co 3 O 4 + H 2 O + OH − ↔ 3CoOOH + e − CoOOH + OH − ↔ CoO 2 + H 2 O + e − …”

Doping of Laser‐Induced Graphene and Its Applications

“…The PAA solution combined with CoCl 2 6H 2 O powder was cast on surface of LIG to fabricate Co 3 O 4 /N‐LIG after the second laser irradiation. [ 99 ] The optimal Co 3 O 4 /N‐LIG is produced at 20 wt% cobalt precursor loading with a specific areal capacitance of 216.3 mF cm −2 in KOH electrolyte, while 17.96 mF cm −2 in PVA‐H 3 PO 4 gel electrolyte. Furthermore, the LIG with ternary metal oxide (LIG‐CoNiFe and LIG‐MnNiFe) was fabricated through the second laser irradiation of the LIG loaded with Co(NO 3 ) 2 , MnSO 4 , Ni(NO 3 ) 2 , and Fe(NO 3 ) 3 solutions.…”