Facile synthesis and electrocatalytic performance for oxygen reduction of boron‐doped carbon catalysts on graphene sheets

Abstract

Boron-doped carbon catalysts are synthesized via a liquid-phase electrodeposition technique using methanol-containing graphene nucleating agent and B 2 O 3 dopant as the reaction solution. The relationship between boron-doped content and specific surface area (SSA), as well as their influence on electrocatalytic activity for oxygen reduction reaction, is studied by changing the concentration of B 2 O 3 . When the concentrations of B 2 O 3 are 23.94 and 14.36 mol ml -1 , respectively, boron-doped content and SSA reach the peak values of 0.53 at.% and 18.476 m 2 g -1 . The data of electrochemical tests, such as onset potential of -0.016 V and transferred electron number of 3.74-3.77 in the range of -0.5 to -0.9 V, exhibit that the catalyst with a boron-doped content of 0.47 at.% and an SSA of 18.476 m 2 g -1 has the best electrocatalytic activity in all the synthesized samples. The enhanced electrocatalytic activity is ascribed to a synergistic effect originating from boron-doped content and SSA, in which the SSA contributes more. The experimental results have important guiding significance to maximize the oxygen reduction activity of catalysts and elucidate that it tends to design and synthesize catalysts with large SSA compared with doping.

Arsenic Prodrug-Mediated Tumor Microenvironment Modulation Platform for Synergetic Glioblastoma Therapy

“…The B 1s peak shifted in XPS in AgL at 192.2 eV, while this B 1s peak was shifted to 186 eV after binding with As V in APC. It is observed that the peak at 192.2 eV is mainly attributed to the B–O peak in the B 2 O 3 system . Thus, the peak position change supported our hypothesis of successful chemical binding regimes once the target was captured.…”

“…It is observed that the peak at 192.2 eV is mainly attributed to the B−O peak in the B 2 O 3 system. 53 Thus, the peak position change supported our hypothesis of successful chemical binding regimes once the target was captured. We have also seen the chemical shift of the O 1s peak after As V was captured by the AgL system, as shown in Figure 1e.…”

Nickel MXene Nanosheet and Heteroatom Self-Doped Porous Carbon-Based Asymmetric Supercapacitors with Ultrahigh Energy Density

“…To obtain the chemical bonding of as-synthesized samples, Raman spectroscopy was done as depicted in Figure c. Both NiMX and EMAC-700 have similar characteristic peaks at ∼1345 cm –1 ascribed to the defect-induced D band, indicating the presence of disordered carbon, and the peak at ∼1600 cm –1 is attributed to the in-plane vibrational G band, demonstrating the existence of graphitic carbon . The I D / I G ratio of NiMX and EMAC-700 was found to be 0.87 and 0.96, respectively.…”

“…Both NiMX and EMAC-700 have similar characteristic peaks at ∼1345 cm −1 ascribed to the defect-induced D band, indicating the presence of disordered carbon, and the peak at ∼1600 cm −1 is attributed to the in-plane vibrational G band, demonstrating the existence of graphitic carbon. 15 The I D /I G ratio of NiMX and EMAC-700 was found to be 0.87 and 0.96, respectively. This comparatively low I D /I G value of NiMX corresponds to the large ordering of the sp 2 graphitic domains, hence holding the promise of a good graphitic structure.…”