The electrochemical fabrication of CoCr2O4/electro-reduced graphene oxide electrodes for high-performance supercapacitors

Spinel Phase Engineering Boosted Visible-Light Photocatalytic Activity in Co1–xSrxCr2O4

“…Figure displays the FT-IR spectra of Co 1– x Sr x Cr 2 O 4 ( x = 0, 0.2, 0.4, and 0.6), measured in the range of 4000–400 cm –1 with a 4 cm –1 resolution. In CCO’s FT-IR spectra in Figure a, the broad absorption bands at 3500 and 2900 cm –1 arise from OH bond vibrations in water, and a weak absorption band at 1600 cm –1 is attributed to C–O vibrations from organic components. − Major absorption bands at 760 and 680 cm –1 correspond to the stretching vibrations of Co–O bonds in CoO 4 and Cr–O bonds in CrO 6 units of CCO. The FT-IR spectra from 400 to 900 cm –1 , deconvoluted in Figure b, reveal two subpeaks, indicating symmetric and asymmetric stretching vibrations of CoO 4 and CrO 6 , with the symmetric vibrations showing stronger intensity, indicating a stable spinel structure.…”

“…The O 1s spectra in Figure d provide valuable information about oxygen radicals and their significance in photocatalytic activity. In Figure d, the O 1s spectrum of CCO exhibits three sublevel peaks at 529.3 and 532.2 eV, corresponding to lattice oxygen (OL) and hydroxyl oxygen (OH) on the surface, respectively . OLs are integral to the crystal lattice structure of CoCr 2 O 4 , forming strong bonds with Co and Cr atoms and enhancing the structural stability of catalysts.…”

Development and characterization of self-powered, highly sensitive optoelectronic device based on PVA-rGO nanofibers/n-Si

“…Graphene is a crystal that has the potential to find a very suitable usage area for optoelectronic applications with its prominent properties such as high carrier mobility and good light transmittance (∼97.4%) [11][12][13]. Forms such as reduced graphene oxide (RGO or rGO) or graphene oxide (GO) offer advantages such as low cost, large-area device fabrication, stability and high performance for electrical or optical applications [14][15][16][17][18][19][20]. Furthermore, although graphene has a zero-band gap, its density of states near the Dirac point indicates that composite structures of graphene with photoactive materials are a potential material for high-performance optical devices.…”