In the surroundings of carbon neutrality, nano-Cu 2 O is considered a promising catalyst for the electrochemical CO 2 reduction reaction (ECO 2 RR), whose improvements in product selectivity still require considerable efforts. Here, we present an efficient strategy for controlling the ECO 2 RR product by modifying the surface of nano-Cu 2 O, i.e., by controlling the exposed facets via a reductantcontrolled method to achieve the highest C 2 H 4 selectivity (Faradic efficiency = 74.1 %) for Cu 2 O-based catalysts in neutral electrolytes, and introducing a well-suited metalorganic framework (MOF) coating on the surface of nano-Cu 2 O to obtain syngas completely with an appropriate H 2 :CO ratio. Detailed mechanism and key intermediate have been illustrated by DFT calculations. Our systematic strategy is expected to control the ECO 2 RR product, improve the selectivity, and provide a reliable method for CO 2 management and the green production of important carbon resources.

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In order to obtain cured epoxy resin (EP) with satisfactory thermal stability and flame retardancy, a multi‐element P/N/Si‐containing flame retardant (DPAK) was synthesized by a facile way and was used as a reactive flame retardant to prepare flame‐retardant EP. The flame‐retardant efficiency of DPAK was subsequently evaluated by limiting oxygen index (LOI), UL‐94, and cone calorimeter (CC) test. With a low incorporation amount of DPAK (4 wt%), the resultant EP achieve to UL‐94 V‐0 rating, and the corresponding LOI value reached to 30%, which was higher than that of EP containing DOPO (2.9 wt%). More importantly, the thermogravimetric analysis (TGA) revealed their higher thermal stability than those of EP containing DOPO. Furthermore, dynamic mechanical analysis (DMA) shown the maintained glass transition temperature of DPAK‐EP. The increase of CO/CO2 ratio in the CC test for the DPAK‐EP samples proved the gas‐phase activity of DPAK. Additionally, DPAK showed evidence of condensed phase activity by increasing char residue in TGA and CC test. The scanning electronic microscope together with the energy dispersive X‐ray spectrometer (SEM–EDX) and X‐ray photoelectron spectroscopy (XPS) exhibited that DPAK promoted the formation of compacted phosphorus‐silicon char layer. Subsequently, TG‐FTIR results indicated that DPAK‐EP produced lesser combustible gases than neat sample did, improving flame‐retardant properties of epoxy resin.

The photocatalytic production of syngas from CO2 and water is an attractive and straightforward way for both solar energy storage and sustainable development. Here, we combined the hybrid shell of a bimetallic metal–organic framework (MOF) Zn/Co-zeolitic imidazolate framework (ZIF) and the hybrid photoactive center of Ni-doped CdS nanoparticles (Ni@CdS) to construct a new “2 + 2” photocatalysis system Ni@CdS⊂Zn/Co-ZIF through a facile self-assembly process, which exhibited a double-synergic effect for visible light harvesting and CO2 conversion, leading to one of the highest photocatalytic syngas production rates and excellent recyclability. The H2/CO of syngas ratios can be readily adjusted by controlling the ratio of Zn/Co in the hybrid MOF shell.