金屬有機骨架修飾氧化亞銅納米線用於選擇性光催化CO2還原制CH4
作者:
小柯機器人發布時間:2020/12/31 23:28:00
香港城巿大學Yun Hau Ng團隊揭示了金屬有機骨架修飾氧化亞銅納米線用於選擇性光催化CO2還原制CH4過程。 相關研究成果於2020年12月28日發表在《德國應用化學》。
提高氧化亞銅(Cu2O)的穩定性對其在人工光合作用中的實際應用至關重要。
該文中,研究人員使用無表面活性劑的方法將Cu2O納米線封裝在Cu 3(BTC)2(BTC=1,3,5-苯三羧酸鹽)的金屬有機框架(MOF)中。這種MOF不僅抑制了水蒸氣對Cu2O的腐蝕,而且促進了電荷分離和Co2的吸收,從而使納米複合材料在溫和的反應條件下選擇性光催化CO2還原為甲烷(CH4)的活性和穩定性提高了1.9倍。此外,時間分辨光致發光證實了光生電子從Cu2O導帶直接轉移到非激發Cu3(BTC)2的LUMO能級。
該文提出了一種有效的CO2轉化策略,通過電荷分離和CO2吸附的協同作用,實現了MOFs與金屬氧化物整合後的的光催化反應。
附:英文原文
Title: Metal‐Organic Frameworks Decorated Cuprous Oxide Nanowires for Long‐lived Charges Applied in Selective Photocatalytic CO2 Reduction to CH4
Author: Hao Wu, Xin Ying Kong, Xiaoming Wen, Siang-Piao Chai, Emma C. Lovell, Junwang Tang, Yun Hau Ng
Issue&Volume: 28 December 2020
Abstract: Improving the stability of cuprous oxide (Cu 2 O) is imperative to its practical applications in artificial photosynthesis. In this work, Cu 2 O nanowires are encapsulated by metal‐organic frameworks (MOFs) of Cu 3 (BTC) 2 (BTC = 1,3,5‐benzene tricarboxylate) using a surfactant‐free method. Such MOFs not only suppress the water vapor‐induced corrosion of Cu 2 O but also facilitate charge separation and CO 2 uptake, thus resulting in a nanocomposite representing 1.9 times improved activity and stability for selective photocatalytic carbon dioxide (CO 2 ) reduction into methane (CH 4 ) under mild reaction conditions. Furthermore, direct transfer of photogenerated electrons from the conduction band of Cu 2 O to the LUMO level of non‐excited Cu 3 (BTC) 2 has been evidenced by time‐resolved photoluminescence. This work proposes an effective strategy for CO 2 conversion by a synergy of charge separation and CO 2 adsorption, leading to the enhanced photocatalytic reaction when MOFs are integrated with metal oxide photocatalyst.
DOI: 10.1002/anie.202015735
Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202015735