The effects of halide ions (F−, Cl−, Br−, or I−) on nanoporous Zn-based electrocatalysts were assessed. All catalysts in the presence of halides exhibited high electrocatalytic performances of CO2 reduction reaction (CO2RR) and efficient suppression of hydrogen evolution reaction (HER) with a maximum Faradaic efficiency of up to 97%. The increasing adsorption strength from F− to I− is proposed to form more porous structures and higher oxidized Zn species, thus facilitating the protonation of CO2 and stabilizing the adsorbed intermediates induced by charge donation from the adsorbed halides on Zn surface to CO2, enhance CO2RR and simultaneously suppress HER.
Bibliographical noteFunding Information:
The authors acknowledge financial support from the Korea Institute of Science and Technology (KIST) institutional program, the KIST Young Fellow program (2V05970), and partly from the KU-KIST program by the Ministry of Science, ICT and Future Planning. This work was also supported by Next Generation Carbon Upcycling Project (Project No. 2017M1A2A2046713) through the National Research Foundation (NRF) funded by the Ministry of Science and ICT, Republic of Korea. D.L.T.N. thanks to Ms. Khoa Le Tue Nguyen (Microsoft Corp.) for her assistance.
© 2018 Elsevier B.V.
- CO production
- CO reduction reaction
- Electrochemical surface area
- Halide ion
- Zn-based catalyst
ASJC Scopus subject areas
- Process Chemistry and Technology