Large‐Scale Synthesis of Multifunctional Single‐Phase Co₂C Nanomaterials

Abstract

Achieving scalable synthesis of nanoscale transition‐metal carbides (TMCs), regarded as substitutes for platinum‐group noble metals, remains an ongoing challenge. Herein, a 100‐g scale synthesis of single‐phased cobalt carbide (Co2C) through carburization of Co‐based Prussian Blue Analog (Co‐PBA) is reported in CO2/H2 atmosphere under mild conditions (230 °C, ambient pressure). Textural property investigations indicate a successful preparation of orthorhombic‐phased Co2C nanomaterials with Pt‐group–like electronic properties. As a demonstration, Co2C achieves landmark photo‐assisted thermal catalytic CO2 conversion rates with photo‐switched product selectivity, which far exceeds the representative Pt‐group‐metal–based catalysts. This impressive result is attributed to the excellent activation of reactants, colorific light absorption, and photo‐to‐thermal conversion capacities. In addition to CO2 hydrogenation, the versatile Co2C materials show huge prospects in antibacterial therapy, interfacial water evaporation, electrochemical hydrogen evolution reaction, and battery technologies. This study paves the way toward unlocking the potential of multi‐functional Co2C nanomaterials.

Hierarchical Co2P/CoS2@C@MoS2 Composites with Hollow Cavity and Multiple Phases Toward Wideband Electromagnetic Wave Absorption

“…Besides, the peaks at 782.3 eV and 798.5 eV indicate the existence of Co-O bond, manifesting a portion oxidation for Co particles. [48,49] In Figure 3c, the S 2p spectrum shows two peaks at 161.7 eV and 163.0 eV, corresponding to S 2p 3/2 and S 2p 1/2 , respectively. The degree of graphitization carbon is investigated by Raman spectroscopy in Figure S6, Supporting Information.…”

Ruthenium–Cobalt Solid-Solution Alloy Nanoparticles for Enhanced Photopromoted Thermocatalytic CO2 Hydrogenation to Methane

“…The corresponding Arrhenius curves display one-stage linear plots with activation energies of 61.77 in dark and 46.14 kJ mol −1 under illumination, and these results indicate that light irradiation reduces the apparent activation energy, which could be attributed to the significantly enhanced activation of reactants and intermediate species (Figure 4e). 16,19,31 Subsequently, the catalytic activity of the Ru 0.88 Co 0.12 /TiO 2 catalyst was evaluated under various light intensities at 200 °C (T set. ).…”

Nb2CTx MXene/Delignified Wood–Supported Phase-Change Composites with Desirable Photothermal Conversion Efficiency and Enhanced Flame Retardancy for Solar–Thermal Energy Storage

“…Solar energy, the most renewable, inexhaustible, and environmentally friendly energy source, has attracted widespread attention in recent decades due to the global fossil energy crisis and serious environmental pollution. − Among the approaches for harnessing solar energy, solar–thermal conversion and storage are considered the most promising owing to their operational simplicity and superior energy conversion efficiency. − However, the large-scale utilization of solar–thermal conversion technology is severely restricted by the intermittency, inefficiency, and volatility of solar irradiation. − Phase-change materials (PCMs) are widely applied as efficient thermal energy storage (TES) materials owing to their high TES density and isothermal phase transition temperature during the phase transition process. − Introducing PCMs into solar–thermal conversion systems has been deemed the most interesting and effective approach for overcoming the intermittency and inefficiency of solar irradiation. , Currently, there is a large volume of studies that demonstrate the promising application of PCM in buildings based on TES and solar–thermal conversion and storage. − Numerous substances, including organic materials (e.g., n -alkanes, polyethylene glycols, fatty acids, and polyols) and inorganic materials (e.g., salts, hydroxides, salt hydrates, and metals), have been developed for TES. − …”