• Energy Research

International audience The CO2 reduction reaction using a renewable energy source is a promising strategy for its utilization. Such a technology however requires the development of catalysts with optimized activity and selectivity that can be integrated into the device architectures. Flow electrolyzers have recently been proposed for facilitating the electrochemical CO2 reduction reaction thanks to their unique ability to perform electroreduction at high reaction rates via the creation of three-phase interface. While some examples of flow electrolyzers for the conversion of CO2 has recently been reported, the influence of the CO2 and electrolyte streams on the overall catalytic mechanism is remained ambiguous. Here, we synthesized single-atom nickel on two-dimensional nitrogen-doped carbon nanosheets (SA Ni-NC) for the CO2-to-CO conversion. Taking advantage of this model catalyst, we explored the correlation between the applied potential and the feeds in both

The activity of “fueled” NiGa2S4/ITO photodetector is described. The presence of ethanol boosts the performances of the photodetector increasing its responsivity and spectral response.

The large-scale production of graphene and reduced-graphene oxide (rGO) requires low-cost and eco-friendly synthesis methods. We employed a new, simple, cost-effective pyrolytic method to synthetize oxidized-graphenic nanoplatelets (OGNP) using bamboo pyroligneous acid (BPA) as a source. Thorough analyses via high-resolution transmission electron microscopy and electron energy-loss spectroscopy provides a complete structural and chemical description at the local scale of these samples. In particular, we found that at the highest carbonization temperature the OGNP-BPA are mainly in a sp(2) bonding configuration (sp(2) fraction of 87%). To determine the electrical properties of single nanoplatelets, these were contacted by Pt nanowires deposited through focused-ion-beam-induced deposition techniques. Increased conductivity by two orders of magnitude is observed as oxygen content decreases from 17% to 5%, reaching a value of 2.3 × 10(3) S m(-1) at the lowest oxygen content. Temperature-dependent conductivity reveals a semiconductor transport behavior, described by the Mott three-dimensional variable range hopping mechanism. From the localization length, we estimate a band-gap value of 0.22(2) eV for an oxygen content of 5%. This investigation demonstrates the great potential of the OGNP-BPA for technological applications, given that their structural and electrical behavior is similar to the highly reduced rGO sheets obtained by more sophisticated conventional synthesis methods.