High-density Ag nanosheets for selective electrochemical CO2 reduction to CO. (29th January 2021)

• Record Type: Journal Article
• Authors: Yan, Shenglin; Chen, Chengzhen; Zhang, Fanghua; Mahyoub, Samah A; Cheng, Zhenmin
• Is Part Of: Nanotechnology. Volume 32:Number 16(2021)
• Publication Date: 2021-01-29
• Subjects: CO2 electroreduction -- CO -- Ag nanosheets -- H3BO3 -- two-dimensional metal; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/abd6af
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: To increase the specific surface area, high-density (i.e. number per unit area) Ag nanosheets (ANS) with large electrochemically active surface area and rich edge active sites over Ag plates were synthesized via a facile electrodeposition approach in a double electrode system at a constant current of −1 mA for 1800 s. By adjusting the concentration of H3 BO3 (0.5 M, 0.1 M and 0.05 M), which is used to control the growth direction of ANS, ANS-20, -50, -350 were obtained with varying thickness of 20 nm, 50 nm, and 350 nm, respectively. Notably, ANS-20 showed a remarkable current density of −6.48 mA cm −2 at −0.9 V versus the reversible hydrogen electrode (RHE), which is almost 1.6 and 2.4 times as high as those of ANS-50 and -350, respectively. Furthermore, ANS-20 exhibits the best CO selectivity of 91.2% at −0.8 V versus RHE, while the other two give 84.6% and 77.9% at the same potential. The excellent performance of ANS-20 is attributed to its rich edge active sites and large electrochemically active surface area (ECSA).