Citation: Wanjun Sun, Xiangyu Meng, Chunjiang Xu, Junyi Yang, Xiangming Liang, Yinjuan Dong, Congzhao Dong, Yong Ding. Amorphous CoO_x coupled carbon dots as a spongy porous bifunctional catalyst for efficient photocatalytic water oxidation and CO₂ reduction[J]. Chinese Journal of Catalysis, ;2020, 41(12): 1826-1836. doi: 10.1016/S1872-2067(20)63646-4 shu

Amorphous CoO_x coupled carbon dots as a spongy porous bifunctional catalyst for efficient photocatalytic water oxidation and CO₂ reduction

a State Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous Metals Chemistry and Resources Utilization of Gansu Province, and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, Gansu, China;
b State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China

Received Date: 25 February 2020
Revised Date: 23 March 2020

Fund Project: This work was supported by the National Natural Science Foundation of China (21773096), Fundamental Research Funds for the Central Universities (lzujbky-2018-k08) and the Natural Science Foundation of Gansu (17JR5RA186).

Cobalt-based oxides, with high abundance, good stability and excellent catalytic performance, are regarded as promising photocatalysts for artificial photosynthetic systems to alleviate foreseeable energy shortages and global warming. Herein, for the first time, a series of novel spongy porous CDs@CoO_x materials were synthesized to act as an efficient and stable bifunctional photocatalyst for water oxidation and CO₂ reduction. Notably, the preparation temperatures visibly influence the morphologies and photocatalytic performances of the CDs@CoO_x. Under the optimal conditions, a maximum O₂ yield of 40.4% and pretty apparent quantum efficiency (AQE) of 58.6% at 460 nm were obtained over CDs@CoO_x-300 for water oxidation. Similarly, the optimized sample CDs@CoO_x-300 manifests significant enhancement on the CO₂-to-CO conversion with a high selectivity of 89.3% and CO generation rate of 8.1 μmol/h, which is superior to most previous cobalt-based catalysts for CO₂ reduction. The composite CDs@CoO_x-300 not only exposes more active sites but also facilitates electron transport, which results in excellent photocatalytic activity. In addition, the boosted photocatalytic behavior is attributed to the synergistic effect between CoO_x and CDs, which was verified by the photocatalytic activity control experiments and electrochemical characterization. The work offers a novel strategy to fabricate a high performance bifunctional photocatalyst for water oxidation and CO₂ reduction.
- Carbon dots coupled CoO_x,
- Bifunctional photocatalyst,
- Water oxidation,
- CO₂ reduction,
- Synergistic effect
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Amorphous CoOx coupled carbon dots as a spongy porous bifunctional catalyst for efficient photocatalytic water oxidation and CO2 reduction

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通讯作者: 陈斌, bchen63@163.com

Amorphous CoO_x coupled carbon dots as a spongy porous bifunctional catalyst for efficient photocatalytic water oxidation and CO₂ reduction