{Reference Type}: Journal Article {Title}: Large-Scale Synthesis of Multifunctional Single-Phase Co2 C Nanomaterials. {Author}: Yang Z;Zhao T;Hao S;Wang R;Zhu C;Tang Y;Guo C;Liu J;Wen X;Wang F; {Journal}: Adv Sci (Weinh) {Volume}: 10 {Issue}: 19 {Year}: 2023 Jul 24 {Factor}: 17.521 {DOI}: 10.1002/advs.202301073 {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 (Co2 C) 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 Co2 C nanomaterials with Pt-group-like electronic properties. As a demonstration, Co2 C 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 Co2 C 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 Co2 C nanomaterials.