Boosting CO₂ electroreduction over silver nanowires modified by wet-chemical sulfidation and subsequent electrochemical de-sulfidation

Abstract

Ag nanowires modified by wet-chemical sulfidation and subsequent electrochemical de-sulfidation possess more nanofeatures and enhanced eCO2RR performance.

Enhanced Electrochemical Reduction of CO2 by Zeolitic Imidazolate Frameworks-8 Supported Silver Nanoparticles

“…Therefore, we concluded that the species that participate CO2RR may be Ag2S-like phase or Ag, which depends on the CO2RR potential. The effect of sulfation [22][23] or Ag-S interaction [4], either positive or negative, on the CO2RR performance can't be excluded, but it will not cover the catalytic advantage of Ag/ZIF-8 over Ag/C because Ag NPs in both catalysts were prepared by using MPA and would not exhibit too many differences. The small-sized Ag NPs (3.9 nm) on ZIF-8 and the possible synergistic effect between Ag NPs and ZIF-8 can account for the catalytic advantage of Ag/ZIF-8 over Ag/C.…”

One‐dimensional Nanomaterial Electrocatalysts for CO2Fixation

“…Previous studies have applied Ag-based catalysts with different sizes andm orphologies as electrode materials for CO 2 RR, due to their high activity and selectivity for CO 2 reduction to CO. For instance, Han and co-workers utilized Ag nanowires for electroreduction CO 2 to CO. [27] In brief, core-shell Ag@AgS nanowires were obtained by aw et-chemical sulfidation process of Ag NWs, and then electrochemically removed sulfide to form de-sulfidated Ag nanowires (DS-Ag NWs, Figure 3a). The surfaceo ft he obtainedD S-Ag NWs was consisted of abundant Ag nanocrystallites, resulting in am ore uneven surface than the originalAgNWs (Figure 3b-d).…”

“…Furthermore, by wrapping with reduced graphene oxide (rGO), the Cu NWs preserved the origi- Reproducedw ith permission. [27] Copyright2 019, The Royal Societyof Chemistry.…”

“… (a) Preparation process of the de‐sulfidated (DS)‐Ag NWs, (b) TEM images of Ag NWs, (c) TEM and (d) high‐resolution TEM images of DS‐Ag NWs. Reproduced with permission . Copyright 2019, The Royal Society of Chemistry.…”

Ag Nanowires/C as a Selective and Efficient Catalyst for CO2 Electroreduction

“…Nevertheless, gold and palladium are improper for large-scale utilization owing to their rarity and costliness [28]. Zinc possesses poorer stability compared with the other three metals [29]. Silver provides an appreciable compromise between expense and performance and is an attractive option.…”