High-Density CuInS2 Quantum Dots for Efficient and Stable CO2 Electroreduction

Fanrong Chen, Xiaoying Lu, Liang Ding, Zhen Hua Lyu, Xiaoling Zhang*, Jiaju Fu*, Jin Song Hu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Electrochemically converting CO2 back into fuels and chemicals is promising in alleviating the greenhouse effect worldwide. Various high-efficiency catalysts have been achieved, yet the unsatisfied structural stability under CO2 electrolysis conditions restricts their practical application. Herein, a sub-5 nm sized CuInS2 quantum dots (CIS-QDs) based electrocatalyst for converting CO2 into CO are developed. Taking advantage of the stable M─Ch (metal-chalcogenide) covalent bonds, and unique p-block metal properties, the as-prepared catalyst exhibits excellent structural stability under large overpotentials and can achieve a high CO Faradaic efficiency (FE) of 86% (total CO2 reduction FE of 89%) at −0.65 V versus reversible hydrogen electrode with long-term durability of 40 h and outstanding current densities of 10.6 mA cm−2 simultaneously. Furthermore, detailed electrochemical analyses revealed that the excellent performance of the as-prepared catalysts shall be attributed to the high-density active sites and fast charge transfer brought by the ultrasmall size of CIS-QDs. This work provides insights into the design of high-density and stable catalytic sites for developing high-performance electrocatalysts.

Original languageEnglish
Article number2300957
JournalSmall Methods
Volume8
Issue number1
DOIs
Publication statusPublished - 19 Jan 2024

Keywords

  • CuInS quantum dots
  • electrocatalytic CO reduction
  • high-density active sites
  • high-performance electrocatalysts
  • long-term durability

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