Soybean straw biomass-derived Fe–N co-doped porous carbon as an efficient electrocatalyst for oxygen reduction in both alkaline and acidic media

Abstract

Fe–N co-doped porous carbon (Fe–N–PC) was prepared by a facile one-step pyrolysis strategy using biomass soybean straw as the precursor, which exhibits outstanding electrocatalytic performance for ORR, excellent stability and methanol tolerance.

Meso‐macroporous Carbons Decorated with Ample Nitrogen Sites as Bifunctional Catalysts in CO2 Catalytic Conversion and Oxygen Reduction Reaction

“…As shown in Figure 8C and S3B, a series of good linear and parallel K‐L plots between J −1 vs ω −0.5 were obtained for both the 3D‐NHPC‐4 and 3D‐NHPC‐2 electrodes at various potentials ranging from 0.25 V to 0.65 V. The electron transfer numbers of electrons transferred per O 2 molecule (n) were calculated from the slope of the K−L plots, which were shown in Figure 8D. Within the range of the electron transfer number from 3.2 to 4 for both 3D‐NHPC‐4 and 3D‐NHPC‐2, the ORR proceeds via a nearly four‐electron reduction mechanism, which are comparable to that of commercial Pt/C [74–76] . The smooth reactant diffusion to active sites and good kinetic process of 3D‐NHPC‐x for ORR was also exhibited by the Tafel carves.…”

Metal-Supported Biochar Catalysts for Sustainable Biorefinery, Electrocatalysis, and Energy Storage Applications: A Review

“…The ever-increasing energy demands all over the world and the necessity of reducing the consumption of fossil fuels has prompted the research for alternative power sources. In the last decades, electrochemical devices such as fuel cells and metal-air batteries have attracted a lot of attention as energy conversion/storage devices due to their green character and high conversion efficiency [137,138]. These technologies usually relied on electrochemical reactions, namely oxygen reduction, oxygen evolution, and hydrogen evolution reactions (ORR, OER, and HER, respectively) on their cathodes or anodes [139].…”

In Situ Synthesis of Fe−N Co‐doped Porous Carbon Nanospheres by Extended Stöber Method for Oxygen Reduction in Both Alkaline and Acidic Media

“…The Tafel slopes of the FeÀ NÀ Cs-1.0 were also studied further assessing the kinetics of oxygen reduction process (Figure 6f), it shows the Tafel slope value of 69 mV • dec À 1 , close to 70 mV • dec À 1 of Pt/C, these results revealed FeÀ NÀ Cs-1.0 sample displays closely analogous fast ORR kinetic processes with Pt/C with the high catalytic efficiency. [61,67] Moreover, the catalytic stability and methanol resistance were also measured by chronoamperometry method. Figure 7a showed tolerance effects of FeÀ NÀ Cs-1.0 and Pt/C toward To better understand the electronic conductivities for FeÀ NÀ Cs and Pt/C catalysts, the electrochemical impedance spectroscopy (EIS) measurements were performed in the frequency range from 0.1 Hz to 100 kHz in O 2 -saturated 0.1 M KOH and 0.1 M HClO 4 solution (seen Figure S3).…”