Bi@Sn Core–Shell Structure with Compressive Strain Boosts the Electroreduction of CO2 into Formic Acid

• DOI: 10.1002/advs.201902989
• Publication Date: 2020-10-01T16:50:53Z
• Authors: Yulin Xing; Xiangdong Kong; Xu Guo; Yan Liu; Qiuyao Li; Yuzhe Zhang; Yelin Sheng; Xupeng Yang; Zhigang Geng; Jie Zeng
• Keywords: Science; CO2 electroreduction; Q; Bi@Sn catalysts; core–shell structure; compressive strain; 01 natural sciences; 7. Clean energy; Communications; 0104 chemical sciences

Abstract As a profitable product from CO 2 electroreduction, HCOOH holds economic viability only when the selectivity is higher than 90% with current density ( j ) over −200.0 mA cm −2 . Herein, Bi@Sn core–shell nanoparticles (Bi core and Sn shell, denoted as NPs) are developed to boost activity of electroreduction into HCOOH. In an H‐cell system 0.5 m KHCO 3 electrolyte, NPs exhibit Faradaic efficiency for (FE 91% partial −31.0 at −1.1 V versus reversible hydrogen electrode. The potential application testified via chronopotentiometric measurements in flow‐cell 2.0 electrolyte. Under this circumstance, achieve FE 92% energy 56% steady‐state −250.0 Theoretical studies indicate that barrier potential‐limiting step formation decreased owing compressive strain resulting enhanced catalytic performance.