Volume 62, Issue 50 e202311304
Research Article

Tweaking Photo CO2 Reduction by Altering Lewis Acidic Sites in Metalated-Porous Organic Polymer for Adjustable H2/CO Ratio in Syngas Production

Ratul Paul

Ratul Paul

Department of Catalysis & Fine Chemicals, CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad, 500 007 India

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India

These authors contributed equally to this work.

Search for more papers by this author
Risov Das

Risov Das

New Chemistry Unit and School of Advanced Materials, Jawaharlal Nehru Centre forAdvanced Scientific Research, Jakkur, Bangalore-560064 India

School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560064 India

These authors contributed equally to this work.

Search for more papers by this author
Nitumani Das

Nitumani Das

Department of Catalysis & Fine Chemicals, CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad, 500 007 India

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India

Search for more papers by this author
Subhajit Chakraborty

Subhajit Chakraborty

New Chemistry Unit and School of Advanced Materials, Jawaharlal Nehru Centre forAdvanced Scientific Research, Jakkur, Bangalore-560064 India

School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560064 India

Search for more papers by this author
Chih-Wen Pao

Chih-Wen Pao

National Synchrotron Radiation Research Centre, 101 Hsin-Ann Road, Hsinchu, 30076 Taiwan

Search for more papers by this author
Dr. Quang Thang Trinh

Dr. Quang Thang Trinh

Queensland Micro- and Nanotechnology Centre, Griffith University, Brisbane, 4111 Australia

Search for more papers by this author
Dr. G. T. Kasun Kalhara Gunasooriya

Corresponding Author

Dr. G. T. Kasun Kalhara Gunasooriya

School of Sustainable Chemical, Biological and Materials Engineering, University of Oklahoma, Norman, OK 73019 USA

Search for more papers by this author
Dr. John Mondal

Corresponding Author

Dr. John Mondal

Department of Catalysis & Fine Chemicals, CSIR-Indian Institute of Chemical Technology, Uppal Road, Hyderabad, 500 007 India

Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002 India

Search for more papers by this author
Prof. Sebastian C. Peter

Corresponding Author

Prof. Sebastian C. Peter

New Chemistry Unit and School of Advanced Materials, Jawaharlal Nehru Centre forAdvanced Scientific Research, Jakkur, Bangalore-560064 India

School of Advanced Materials, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur, Bangalore-560064 India

Search for more papers by this author
First published: 23 October 2023
Citations: 47

Graphical Abstract

Zn and Co based POP with different Lewis acidity has been developed for controlling water splitting and CO2 reduction under sunlight. Low-cost option of syngas production with adjustable H2/CO ratio was demonstrated obtained by skipping the use of any sacrificial electron donors (SEDs), cocatalysts, or photo-sensitizers.

Abstract

Herein, we have specifically designed two metalated porous organic polymers (Zn-POP and Co-POP) for syngas (CO+H2) production from gaseous CO2. The variable H2/CO ratio of syngas with the highest efficiency was produced in water medium (without an organic hole scavenger and photosensitizer) by utilizing the basic principle of Lewis acid/base chemistry. Also, we observed the formation of entirely different major products during photocatalytic CO2 reduction and water splitting with the help of the two catalysts, where CO (145.65 μmol g−1 h−1) and H2 (434.7 μmol g−1 h−1) production were preferentially obtained over Co-POP & Zn-POP, respectively. The higher electron density/better Lewis basic nature of Co-POP was investigated further using XPS, XANES, and NH3-TPD studies, which considerably improve CO2 activation capacity. Moreover, the structure–activity relationship was confirmed via in situ DRIFTS and DFT studies, which demonstrated the formation of COOH* intermediate along with the thermodynamic feasibility of CO2 reduction over Co-POP while water splitting occurred preferentially over Zn-POP.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.