.png){kind=icon}
.png){kind=icon}
Return
Hierarchical Polymorphic Nickel-Tin Sulfides/MWCNT for Permselective Electroreduction of CO2 to Formate: RRDE-Assisted Product Validation
.png){kind=icon}
PRE
AI
P
S
M
S
S
DOI：10.1021/acsaem.6c01027.png)
.png){kind=icon}
Original request for help.png){kind=icon}
Share.png){kind=icon}
Save
Abstract
En 中文
Electrochemical CO2 reduction (eCO2RR) to value added chemicals such as formate is a promising tool toward carbon neutrality, yet achieving high selectivity and current density, simultaneously remains a significant challenge. Most of the catalysts suffer from competing hydrogen evolution reaction (HER) and poor electronic conductivity. In this study, we developed a polymorphic nickel-tin-sulfides (NTS) hybrid catalyst integrated with multi-walled carbon nanotubes (MWCNT) via a facile solvothermal method (NTS/MWCNT). Structural characterizations have confirmed the polymorphic structures that promote the selective CO2 reduction to formate. The optimized NTS/MWCNT catalyst exhibited exceptional performance for CO2 reduction and achieved maximum faradaic efficiency (FE) of 93.4% for formate generation with a partial current density of 30.4 mA cm−2. To provide deeper insight into liquid and gaseous product distribution and catalytic activity during eCO2RR, we employed 1H NMR, gas chromatography (GC) and hydrodynamic voltammetry using rotating ring-disk electrode (RRDE) studies. Accordingly, this work highlights the existence of synergistic interaction between polymorphic NTS, such as γ-Sn2S3, NiS, and Ni3S2 phases and MWCNT, which is not only selective towards formate generation but also robust in terms of structural stability. Thus, NTS/MWCNT acts as an efficient catalyst for eCO2RR, and RRDE study demonstrates as a powerful tool for in situ product monitoring during electrolysis with ease at oxidative and reductive cycles, offering valuable perceptions for rational designing of next-generation eCO2RR electrocatalysts.
Keywords:
Carbon nanotubes
Catalysts
Inorganic carbon compounds
Oxides
Redox reactions
CO2 electroreduction
nickel-tin-sulfide
formate generation
rotating ring disc electrode
faradaic efficiency
Journal
IF:
5.5
Papers:
1.1W
Citations:
4.5W
Organization
Cited Papers