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Achieving electroreduction of CO₂ to CH₃OH with high selectivity using a pyrite–nickel sulfide nanocomposite
- Zhao, Siqi, Guo, Sijie, Zhu, Cheng, Gao, Jin, Li, Hao, Huang, Hui, Liu, Yang, Kang, Zhenhui
- RSC advances 2017 v.7 no.3 pp. 1376-1381
- active sites, carbon dioxide, electrochemistry, electrodes, electrolytes, hot water treatment, hydrogen, hydrogen production, methanol, nanocomposites, transition elements
- Electrochemical reduction of carbon dioxide (CO₂) to methanol (CH₃OH) catalyzed by transition metals has been proved feasible and effective in aqueous electrolytes. In this work, we introduce a FeS₂/NiS nanocomposite electrocatalyst synthesized by traditional hydrothermal method, which selectively reduces CO₂ to CH₃OH with an unprecedented overpotential of 280 mV and a high faradaic efficiency up to 64% at the potential of −0.6 V vs. reversible hydrogen electrode (RHE). The FeS₂/NiS nanocomposite electrocatalyst exhibits a stable current density of 3.1 mA cm⁻² over a 4 hour stability test. The high selectivity towards CO₂ electroreduction to CH₃OH may be attributed to the special ladder structure of the FeS₂/NiS nanocomposite. The active sites are located at the interface between FeS₂ and NiS which can effectively suppress the side reaction hydrogen evolution reaction and facilitate the CO₂ reduction reaction.