Herein, a magnetically separable reduced graphene oxide (rGO)-supported CoFe 2 O 4 –TiO 2 photocatalyst was developed by a simple ultrasound-assisted wet impregnation method for efficient photocatalytic H 2 production. Integration of CoFe 2 O 4 with TiO 2 induced the formation of Ti 3+ sites that remarkably reduced the optical band gap of TiO 2 to 2.80 eV from 3.20 eV. Moreover, the addition of rGO improved the charge carrier separation by forming Ti–C bonds. Importantly, the CoFe 2 O 4 –TiO 2 /rGO photocatalyst demonstrated significantly enhanced photocatalytic H 2 production compared to that from its individual counterparts such as TiO 2 and CoFe 2 O 4 –TiO 2 , respectably. A maximum H 2 production rate of 76 559 μmol g –1 h –1 was achieved with a 20 wt % CoFe 2 O 4 - and 1 wt % rGO-loaded TiO 2 photocatalyst, which was approximately 14-fold enhancement when compared with the bare TiO 2 . An apparent quantum yield of 12.97% at 400 nm was observed for the CoFe 2 O 4 –TiO 2 /rGO photocatalyst under optimized reaction conditions. This remarkable enhancement can be attributed to synergistically improved charge carrier separation through Ti 3+ sites and rGO support, viz., Ti–C bonds. The recyclability of the photocatalyst was ascertained over four consecutive cycles, indicating the stability of the photocatalyst. In addition, it is worth mentioning that the photocatalyst could be easily separated after the reaction using a simple magnet. Thus, we believe that this study may open a new way to prepare low-cost, noble-metal-free magnetic materials with TiO 2 for sustainable photocatalytic H 2 production.

The development of inexpensive, highly active and non-noble catalysts for the methanol oxidation reaction is extremely desirable for the practical use of direct-methanol fuel cells. Here, we have developed a template-free hydrothermal synthesis followed by calcination to produce highly active hybrid material of reduced graphene oxide (rGO) supported NiCo 2 O 4 (NiCo 2 O 4 /rGO) nano-rods as a non-expensive electro-catalyst for methanol oxidation. The electrochemical performance of the prepared NiCo 2 O 4 /rGO spinel catalyst was investigated by cyclic voltammetry (CV), chronoamperometry (CA) and electrochemical impedance spectroscopy (EIS) techniques. Impressively, the NiCo 2 O 4 /rGO showed greater electrocatalytic activity (78 mA/ cm 2 ) and stability during methanol oxidation in comparison to that of the commercial Pt/C catalyst, which was 3.11 folds higher than the commercial Pt/C (25.08 mA/cm 2 ). The NiCo 2 O 4 / rGO electrode also maintained its remarkable catalytic stability even after consecutive 500 cycles, which was~50 times higher than that of the commercial Pt/C. The overall electroactivity of NiCo 2 O 4 /rGO was remarkably enhanced by the synergistic effect between NiCo 2 O 4 and rGO. This may be due to the formation of mixed-valence cations of Ni 2 + and Co 3 + from the octahedral sites and high electron-transfer conductivity of rGO as well.[a] N.

Nitric oxide (NO) plays a crucial and important role in cellular physiology and also acts as a signaling molecule for cancer in humans. However, conventional detection methods have their own limitations in the detection of NO at low concentrations because of its high reactivity and low lifetime. Herein, we report a strategy to fabricate Pt nanoparticle-decorated electrochemically reduced graphene oxide (erGO)-modified glassy carbon electrode (GCE) with efficiency to detect NO at a low concentration. For this study, Pt@erGO/GCE was fabricated by employing two different sequential methods [first GO reduction followed by Pt electrodeposition (SQ-I) and Pt electrodeposition followed by GO reduction (SQ-II)]. It was interesting to note that the electrocatalytic current response for SQ-I (184 μA) was ∼15 and ∼3 folds higher than those of the bare GCE (11.7 μA) and SQ-II (61.5 μA). The higher current response was mainly attributed to a higher diffusion coefficient and electrochemically active surface area. The proposed SQ-I electrode exhibited a considerably low LOD of 52 nM (S/N = 3) in a linear range of 0.25–40 μM with a short response time (0.7 s). In addition, the practical analytical applicability of the proposed sensor was also verified.

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A single-image-super-resolution (SISR) is the process of converting a single low-quality (LR) image to a high-quality (HR) image. This technology is utilised in a variety of industries, including medical and satellite imaging, to retrieve quality and required information from blurred or overexposed photos. Because of the lack of ability to extract important data and images due to poor quality surveillance photographs, this method can be utilised in the field of surveillance to produce high-quality images. We'd like to use General Adversarial Networks to handle low-quality photos because existing methods have resulted in slightly fuzzy and greasy images that look like oil paintings (GAN). We'd like to introduce Super Resolution General Adversarial Networks in particular (SRGAN). This method employs perceptual losses. In this case, PSNR, MSE, and SSIM values are shown to be superior to those obtained by standard approaches in this case. The SRGAN-processed photos are of excellent quality, allowing the images to be seen through hazy and misty areas.