Phthalocyanine Based Metal-Organic Framework Ultrathin Nanosheet for Efficient Photocathode toward Light-Assisted Li–CO2 Battery
Phthalocyanine Based Metal-Organic Framework Ultrathin Nanosheet for Efficient Photocathode toward Light-Assisted Li–CO2 Battery
复制标题
用于光辅助锂二氧化碳电池高效光电阴极的酞菁基金属有机框架超薄纳米片
DOI：
10.1002/adfm.202210259
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发表时间：
2022
影响因子：
19
通讯作者：
Ya‐Qian Lan
中科院分区：
文献类型：
--
作者：
Jian‐Hui Wang;Shan Li;Yifa Chen;Long‐Zhang Dong;Ming Liu;Jing‐Wen Shi;Shun‐Li Li;Ya‐Qian Lan
光辅助锂离子电池作为一种利用光能的强大电池技术受到了广泛的关注，但由于缺乏有效的光电阴极催化剂来同时促进二氧化碳的活化/演化过程，其发展仍然受到限制。本文制备了一种酞菁基金属有机骨架纳米片（CoPc-Mn-O），并将其作为光辅助锂离子电池的高效光电阴极催化剂。由此制备的CoPc-Mn-O具有纳米片形貌（≈1 nm）、双活性金属位（即co - n4和Mn-O4）、高导电性和光敏性。该电池的往返效率高达98.5%，超低电压迟滞率为0.05 V，在0.02 mA cm - 2下60小时的循环稳定性为81.3%，是迄今为止最好的光电阴极之一。密度泛函理论计算和表征证明，具有双活性金属位的光敏CoPc-Mn-O在光条件下具有3.2 eV的co2活化活化能，同时促进co2的析出，从而提高电池效率。
Light‐assisted Li–CO2battery, emerging as a powerful battery‐technology to utilize light‐energy, has attracted much attention yet it is still limited by the lack of efficient photocathode catalysts toward simultaneously promoted CO2activation/evolution processes. Here, a kind of phthalocyanine‐based metal–organic framework nanosheet (CoPc–Mn–O) is prepared and applied as efficient photocathode catalyst in light‐assisted Li–CO2battery. Thus‐produced CoPc–Mn–O shows nanosheet‐morphology (≈1 nm), dual active metal‐sites (i.e., Co–N4and Mn–O4), high conductivity, and photosensitivity. The resulting battery delivers a high round‐trip efficiency of 98.5% with an ultralow voltage hysteresis of 0.05 V and superior cycling‐stability (81.3%) for 60 h at 0.02 mA cm−2, which is represented to be one of the best photo‐cathodes to date. Density functional theory calculations and characterizations prove that the presence of photosensitive CoPc–Mn–O with dual active metal‐sites endows an activation energy (3.2 eV) for CO2activation under light condition and simultaneously promote the CO2evolution to enhance the battery efficiency.