Fluorine Doped Cagelike Carbon Electrocatalyst: An Insight into the Structure-Enhanced CO Selectivity for CO₂ Reduction at High Overpotential

Abstract

The critical bottleneck of electrocatalytic CO 2 reduction reaction (CO 2 RR) lies in its low efficiency at high overpotential caused by competitive hydrogen evolution. It is challenging to develop an efficient catalyst achieving both high current density and high Faradaic efficiency (FE) for CO 2 RR. Herein, we synthesized fluorine-doped cagelike porous carbon (F-CPC) by purposely tailoring its structural properties. The optimized F-CPC possesses large surface area with moderate mesopore and abundant micropores as well as high electrical conductivity. When used as catalyst for CO 2 RR, F-CPC exhibits FE of 88.3% for CO at −1.0 V vs RHE with a current density of 37.5 mA•cm −2 . Experimental results and finite element simulations demonstrate that the excellent CO 2 RR performance of F-CPC at high overpotential should be attributed to its structure-enhanced electrocatalytic process stemming from its cagelike morphology.

Hollow Mesoporous Carbon Sphere Loaded Ni–N4 Single‐Atom: Support Structure Study for CO2 Electrocatalytic Reduction Catalyst

“…This feature could promote the overflow effect significantly, thereby increasing the reaction current density. [ 23 ] When CO 2 ‐saturated KHCO 3 electrolyte was replaced with N 2 ‐saturated electrolyte, current density of Ni/HMCS‐3‐800 decreased greatly (≈50%), indicating the high‐catalytic activity of Ni/HMCS‐3‐800 toward CO 2 RR (inset of Figure 5a). Analyzing the products and Faradaic efficiency (FE), all Ni/CS catalysts revealed high CO selectivity (Figure 5b) because the Ni–N 4 active sites exhibited high catalytic selectivity toward CO production.…”

Unveiling the Synergistic Effect between Graphitic Carbon Nitride and Cu2O toward CO2Electroreduction to C2H4

“…The Cu 2 O/CN demonstrate a geometric total current density of −13.32 mA cm −2 at potential of −1.1 V vs. RHE. As showed in electrochemical impedance spectroscopy (EIS) measurement (Figure 4b) as well as the fitted data of EIS (Table S3), it is very interesting that the introduction of the CN support reduces the contact resistance ( R s ) and charge transfer resistance ( R ct ) in comparison to the pristine Cu 2 O, indicating the composite has faster charge‐transfer kinetics in the electrocatalysis process [19] …”

An Investigation of Active Sites for electrochemical CO2 Reduction Reactions: From In Situ Characterization to Rational Design

“…Reproduced with permission. [ 86 ] Copyright 2018, American Chemical Society. d) Synthesis of NSHCF: (1) electrospinning of polymer nanofibers, (2) being carbonized at 900 o C. Reproduced with permission.…”