Nitrogen and Sulfur Co‐doped Carbon Nanosheets for Electrochemical Reduction of CO₂

Abstract

Conversing CO 2 into value-added chemicals endows electrochemical CO 2 reduction reaction (CO 2 RR) with the potential to tackle over issues induced by the increased CO 2 level in the atmosphere. The associated technological viability of this process is highly dependent on exploring efficient electrocatalysts. In this work, we successfully synthesized nitrogen and sulfur co-doped carbon nanosheets (NS-CNSs), which are comprehensively characterized by a variety of characterization techniques. When used as the catalyst for CO 2 RR, the NS-CNSs exhibit remarkably high catalytic activity and selectivity with a Faradaic efficiency of~85.4 % for CO production and long-term durability. The superior performance of this material majorly originates from the unique nanosheets structure with large porosity and the co-doped S and N in the nanosheets, which exposed larger electrochemical activity surface areas and more active sites for promoting CO 2 reduction.

Nitrogen and Boron Co‐Doped Carbon Spheres for Carbon Dioxide Electroreduction

“…The introduction of heteroatoms breaks some initial C−C bonds and forms new carbon‐heteroatom bonds in the carbon matrix, resulting in the creation of defects and unique heteroatom sites, which have been considered as catalytically active sites for CO 2 RR. When doping the pristine carbon with two kinds of heteroatoms, synergistic effects on the reaction pathways are expected to tune the activity and selectivity of CO 2 RR [24–30] . For instance, nitrogen and sulfur co‐doped carbon hierarchically porous carbon nanofiber membranes can achieve a CO Faradaic efficiency of 94%, higher than the nitrogen‐doped reference sample.…”

Metal–Organic Framework‐Based Electrocatalysts for CO2 Reduction

“…Metal-free carbon materials have recently attracted intensive attention due to their low cost, high surface area, and tunable conductivity, [178,179] which are among the most promising alternatives to the expensive noble metals for CO 2 RR. [180] Up to now, various kinds of heteroatom-doped carbon nanostructures, such as N-doped carbon, chlorine-doped carbon, [181] fluorine-doped carbon, [182] Se-doped carbon, [183] N-, B-codoped porous carbon, [184][185][186] nitrogen and phosphorus codoped carbon, [187] and graphene [188] have been explored for CO 2 RR. [189] In addition, the capacity to suppress the competing H 2 evolution reaction makes the N-doped carbon materials much more appealing for selective CO 2 conversion.…”

From CO2 to Value-Added Products: A Review about Carbon-Based Materials for Electro-Chemical CO2 Conversion

“…A recent strategy to further promote the electrocatalytic performance for CO 2 RR is introducing multiple heteroatoms on the carbon network in order to obtain a synergistic effect between both heteroatoms. Wang and co-workers [91] synthesized N,S co-doped carbon nanosheets and analyzed its catalytic performance in comparison with their analog catalysts doped with a single heteroatom (S-doped and N-doped carbon). According to the XPS analysis, the co-doped catalyst has N-pyridinic species and S moieties (-C-S-C) that act as active sites and contributed to reactivity respectively, thus obtaining a superior electrochemical performance for the reduction of CO 2 to CO, whereas single doped materials (S-doped or N-doped carbon) mainly produced H 2 with a low selectivity to CO; a high FE for CO production of 85.4% (at −0.55 V vs. RHE) was obtained with N,S co-doped carbon nanosheets.…”