Photocatalytic Activation and Reduction of CO2 to CH4 over Single Phase Nano Cu3SnS4: A Combined Experimental and Theoretical Study

Neha Sharma, Tilak Das, Santosh Kumar, Reshma Bhosale, Mubul Kabir, Satishchandra Ogale

Research output: Contribution to journalArticle

Abstract

In view of the ability to absorb visible light and high surface catalytic activity, metal sulfides are rapidly emerging as promising candidates for CO2 photoreduction, scoring over the traditional oxide-based systems. However, their low conversion efficiencies due to serious radiative recombination issues and poor stability restrict their real-life applicability. Enhancing their performance by coupling with other semiconductor based photocatalysts or precious noble metals as co-catalysts makes the process cost intensive. Herein, we report a single-phase ternary sulfide-Cu3SnS4 (CTS) as a robust visible light photocatalyst for selective photoreduction of CO2 to CH4. It showed remarkable 80 % selectivity for CH4 evolution with the rate of 14 μmol/g/hr, without addition of any co-catalyst or scavenger. The mechanistic pathway for catalytic activity is elucidated by DFT calculations and in situ ATR, which imply formaldehyde pathway of hydrocarbon production. The Cu-Sn termination of the surface is shown to be the key factor for competent CO2 absorption and activation as confirmed from our X-ray spectroscopy measurements and first principle calculations. This study provides foundation and insights for the
rational design of sulfide-based photocatalysts to produce renewable fuel.
Original languageEnglish
JournalACS Applied Energy Materials
Early online date1 Jul 2019
DOIs
Publication statusE-pub ahead of print - 1 Jul 2019

Cite this

Photocatalytic Activation and Reduction of CO2 to CH4 over Single Phase Nano Cu3SnS4: A Combined Experimental and Theoretical Study. / Sharma, Neha; Das, Tilak; Kumar, Santosh; Bhosale, Reshma; Kabir, Mubul; Ogale, Satishchandra.

In: ACS Applied Energy Materials, 01.07.2019.

Research output: Contribution to journalArticle

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