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Bi@Sn Core–Shell Structure with Compressive Strain Boosts the Electroreduction of CO2 into Formic Acid
Advanced Science ( IF 15.1 ) Pub Date : 2020-10-01 , DOI: 10.1002/advs.201902989
Yulin Xing 1 , Xiangdong Kong 1 , Xu Guo 1 , Yan Liu 1 , Qiuyao Li 1 , Yuzhe Zhang 1 , Yelin Sheng 1 , Xupeng Yang 1 , Zhigang Geng 1 , Jie Zeng 1
Affiliation  

As a profitable product from CO2 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 Bi@Sn NPs) are developed to boost the activity and selectivity of CO2 electroreduction into HCOOH. In an H‐cell system with 0.5 m KHCO3 as electrolyte, Bi@Sn NPs exhibit a Faradaic efficiency for HCOOH (FEHCOOH) of 91% with partial j for HCOOH (jHCOOH) of −31.0 mA cm−2 at −1.1 V versus reversible hydrogen electrode. The potential application of Bi@Sn NPs is testified via chronopotentiometric measurements in the flow‐cell system with 2.0 m KHCO3 electrolyte. Under this circumstance, Bi@Sn NPs achieve an FEHCOOH of 92% with an energy efficiency of 56% at steady‐state j of −250.0 mA cm−2. Theoretical studies indicate that the energy barrier of the potential‐limiting step for the formation of HCOOH is decreased owing to the compressive strain in the Sn shell, resulting in the enhanced catalytic performance.

中文翻译:

具有压缩应变的Bi@Sn核壳结构促进CO2电还原成甲酸

作为CO 2电还原的盈利产品,只有当选择性高于90%且电流密度( j )超过-200.0 mA cm -2时,HCOOH才具有经济可行性。在此,开发了Bi@Sn核壳纳米粒子(Bi核和Sn壳,表示为Bi@Sn NPs)以提高CO 2电还原为HCOOH的活性和选择性。在以 0.5 m KHCO 3作为电解质的 H 电池系统中 ,Bi@Sn NP在 -1.1 时表现出 HCOOH (FE HCOOH )的法拉第效率为 91%, HCOOH 的部分j ( j HCOOH ) 为 -31.0 mA cm -2 V 与可逆氢电极。Bi@Sn NPs 的潜在应用通过使用 2.0 m KHCO 3电解质的流通池系统中的计时电位测量得到了证明。在此情况下,Bi@Sn NPs在稳态j为-250.0 mA cm -2时实现了92%的FE HCOOH和56%的能量效率。理论研究表明,由于Sn壳层中的压缩应变,HCOOH形成的势能限制步骤的能垒降低,从而提高了催化性能。
更新日期:2020-11-19
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