Tuning the Product Selectivity of the Cu Hollow Fiber Gas Diffusion Electrode for Efficient CO2 Reduction to Formate by Controlled Surface Sn Electrodeposition

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

  • Hesamoddin Rabiee
  • Xueqin Zhang
  • Lei Ge
  • Shihu Hu
  • Mengran Li
  • Simon Smart
  • Zhonghua Zhu

Detail(s)

Original languageEnglish
Pages (from-to)21670-21681
Journal / PublicationACS Applied Materials and Interfaces
Volume12
Issue number19
Online published20 Apr 2020
Publication statusPublished - 13 May 2020
Externally publishedYes

Abstract

The efficient CO2 electrochemical reduction reaction (CO2RR) relies not only on the development of selective/active catalysts but also on the advanced electrode configuration to solve the critical issue of poor CO2 mass transport and derived sluggish cathodic reaction kinetics. In this work, to achieve a favorable reaction rate and product selectivity, we designed and synthesized an asymmetric porous Cu hollow fiber gas diffusion electrode (HFGDE) with controlled Sn surface electrodeposition. The HFGDE derived from the optimal Sn electrodeposition condition exhibited a formate Faradaic efficiency (FE) of 78% and a current density of 88 mA cm-2 at -1.2 V versus reversible hydrogen electrode, which are more than 2 times higher than those from the pristine Cu HFGDE. The achieved performance outperformed most of the other Sn-based GDEs, indicating the creation of sufficient contact among CO2, electrolyte, and electrode catalyst through the design of the hollow fiber pore structure and catalytic active sites. The enhancement of formate production selectivity and the suppression of the hydrogen by-product were attributed to the optimized ratio of SnOx species on the electrode surface. The best performance was seen in the HFGDE with the highest Sn2+/Sn4+ (120 s deposition), likely due to the modulating effect of the Cu substrate via electron donation with Sn species. The selectivity control strategy developed in the asymmetric HFGDE provides an efficient and facile method to stimulate selective electrochemical reactions in which the gas-phase reactant with low solubility is involved. Copyright © 2020 American Chemical Society.

Research Area(s)

  • CO2 electrochemical reduction, composite electrocatalyst, formate formation, hollow fiber gas diffusion electrode, Sn electrocatalyst

Citation Format(s)

Tuning the Product Selectivity of the Cu Hollow Fiber Gas Diffusion Electrode for Efficient CO2 Reduction to Formate by Controlled Surface Sn Electrodeposition. / Rabiee, Hesamoddin; Zhang, Xueqin; Ge, Lei et al.
In: ACS Applied Materials and Interfaces, Vol. 12, No. 19, 13.05.2020, p. 21670-21681.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review