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[Display omitted] • A novel nanomaterial toward (CuCo/CP) electrochemical water splitting. • Facile method for Copper-Cobalt (CuCo) supported on carbon paper (CuCo/CP) composition. • The electrochemical activation of electrode led to improvement of OER and HER kinetics. • Tafel slopes has been calculated for CoCu/CP is 97.7 mV dec−1. • CuCo/CP an emerging material for different energy applications. Electrochemical water splitting is one of the most appealing approaches to produce Hydrogen as a sustainable energy resource. The efficiency of Hydrogen evolution reaction (HER) and Oxygen evolution reaction (OER) largely depends on the activity and stability of any elctrocatalyst. Herein, we have employed a facile and reproducible electrodeposition coating method to synthesize bi-metallic Copper-Cobalt (CuCo) containing electrocatalyst supported on carbon paper (CuCo/CP) for electrochemical splitting of water in neutral medium. We have accomplished superior and improved HER and OER electrocatalytic activity, regardless of lower activity of Cu toward HER and OER. The unique structure and synergistic effect of CuCo/CP displayed better electrocatalytic activity with a low overpotential of 450 mV at 10 mA.cm−2 toward HER and just 80 mV at 10 mA.cm−2 toward Oxygen evolution reaction than other Cu containing electrocatalysts. Moreover, the durability of synthesized electrocatalyst at high applied current density ensure the stable nature of the catalyst. The present study may pave the way for the rational design of electrocatalysts for efficient Oxygen and Hydrogen production applications. [ABSTRACT FROM AUTHOR]

A properly designed sensing interface is crucial for the accurate and sensitive detection of biologically active molecules. Single-atom nanozymes from transition metal and nitrogen-doped carbon materials (M-N-C) have caught attention owing to their large surface area and strong bionic enzyme activity. Herein, a three-dimensional layered electrochemical electrode consisting of a Co–N–C nanoenzyme embedded in a reduced graphene oxide aerogel was prepared for the detection of hydrogen peroxide (H 2 O 2), dopamine (DA) and uric acid (UA). Due to its unique three-dimensional layered structure, rGA has excellent electrical conductivity and high material loading and is used to enhance the electrocatalytic performance of Co–N–C. The combination of single-atom nanozymes and electrochemical detection shows unique advantages in catalytic activity and selectivity. The limit of detection and detection range are 0.74 μM and 3–2991 μM respectively for H 2 O 2. Furthermore, it has been successfully implemented for the in-situ detection of H 2 O 2 in living cells. In addition, their simultaneous detection is also realized by the sensors for DA and UA. And it can accurately capture the signal of UA and DA in the urine. Meanwhile, the electrode displays satisfactory stability and repeatability. Therefore, this paper provides a new detection strategy for a variety of bioactive molecules, showing great potential in cell biology, pathophysiology and diagnostics. A novel electrochemical sensor based on single-atom nanozymes Co–N–C for bioactive molecules detection. [Display omitted] • Single-atom nanozymes Co–N–C exhibited peroxidase activity. • Co–N–C/rGA was used to detect H 2 O 2 in living cells, and successfully realized the simultaneous detection of DA and UA. • It provides a new method for the detection of bioactive molecules. [ABSTRACT FROM AUTHOR]

• Nitrogen-doped carbon-based materials have been recently explored as promising electrocatalysts for N 2 fixation. • A novel synthesis approach was applied to obtain nitrogen-doped carbon-based materials as an electrocatalyst for N 2 fixation. • These synthesized free-standing electrodes showed superior electrocatalytic performance with respect to powders form. • The free-standing nitrogen-doped carbon based electrodes possess benefits in terms of charge transfer and active sites per electrode surface area. Nitrogen-doped carbon-based materials have been recently explored as promising electrocatalysts for N 2 fixation. Herein, a nitrogen-doped carbon film as a self-standing electrode is synthesized through a novel and scalable strategy. After the film synthesis, a thin layer of Au nanoparticles is deposited, significantly enhancing the performance of such films in electrocatalytic N 2 reduction. Owing to the exposed active sites and unique free-standing structure, it shows desirable performance towards electrochemical N 2 fixation with a high Faradaic efficiency of 6.4 %, and a NH 3 production rate of 18.3 μg h−1 cm−2 at a low given potential of -0.05 V vs. reversible hydrogen electrode. Such performance is superior in comparison with Au-nanoparticles-modified nitrogen-doped carbon powder. Further comparison of nitrogen-doped carbon film and nitrogen-doped carbon powder also demonstrates the benefits of the free-standing structure in comparison to film-based materials in terms of charge transfer and active sites per electrode surface area. A novel nitrogen doped carbon (NDC) and gold deposited on NDC free-standing electrodes was presented for the an efficient electrocatalytic N 2 fixation to NH 3. These free-standing electrodes showed superior performance in the electrocatalytic N 2 fixation to NH 3 with respect to the powder counterparts NDC deposited on carbon paper. [Display omitted] [ABSTRACT FROM AUTHOR]