Size-controlled, hollow and hierarchically porous Co₂Ni₂ alloy nanocubes for efficient oxygen reduction in microbial fuel cells

Abstract

Uniform, hollow-structure and hierarchically porous materials often produce surprisingly outstanding electrocatalytic performance. Besides, fabrication of highly active and stable non-noble metal-based alloys remains a huge challenge. Herein, a facile synthetic...

Engineering Hollow Core–Shell N–C@Co/N–C Catalysts with Bits of Ni Doping Used as Efficient Electrocatalysts in Microbial Fuel Cells

“…However, the as-prepared catalysts showed, in varying degrees, distinct and showed that accelerating the rotation rate could effectively diminish the diffusion transmission distance between electrons in the solution and increase J d . 51 The Koutecky−Levich (K− L) (Figure 9c) plots calculated from RDE-LSV indicated that the catalytic process in ORR was positively correlated with the concentration of dissolved oxygen per unit volume of the electrolyte, 52,53 and the calculated n of the H−N−C@Co/N− C−3%Ni was 3.96−3.98 (inset in Figure 9c), which was the highest in prepared catalysts ( S2. As displayed in Figure S7, the H−N−C@Co/N− C−3%Ni-MFC possessed the highest V max (0.65 ± 0.01 V) in all MFC-loaded as-prepared catalysts and even exceeded that of Pt/C (0.55 ± 0.03 V), which was about 1.7 times enhancement compared with bare carbon cloth (CC) (0.39 ± 0.01 V).…”

“…Additionally, the H–N–C@Co/N–C–3%Ni catalyst showed a numerically more positive E onset (0.16 V vs Ag/AgCl) and higher J d (−6.52 mA·cm –2 , @–0.8 V vs Ag/AgCl) than those of H–N–C@Co/N–C (0.09 V vs Ag/AgCl, −4.02 mA·cm –2 ), H–N–C@Co/N–C–1%Ni (0.12 V vs Ag/AgCl, −5.07 mA·cm –2 ), and H–N–C@Co/N–C–5%Ni (0.10 V vs Ag/AgCl, −6.04 mA·cm –2 ), approaching to or exceedingly superior than 20% commercial Pt/C (0.16 V, −6.49 mA·cm –2 ), which illustrated that the electrocatalytic activity of the catalyst can be distinctly advanced by adding a certain amount of Ni to the carbon matrix. The RDE-LSV polarization curves (Figures b and S5) showed that accelerating the rotation rate could effectively diminish the diffusion transmission distance between electrons in the solution and increase J d . The Koutecky–Levich (K–L) (Figure c) plots calculated from RDE-LSV indicated that the catalytic process in ORR was positively correlated with the concentration of dissolved oxygen per unit volume of the electrolyte, , and the calculated n of the H–N–C@Co/N–C–3%Ni was 3.96–3.98 (inset in Figure c), which was the highest in prepared catalysts (Figure S6) and close to the theoretical value of the Pt/C catalyst.…”

Study on the Synthesis, Surface Activity, and Self-Assembly Behavior of Anionic Non-Ionic Gemini Surfactants

“…This is mainly because the foaming property of surfactant is related to its surface tension. The lower the surface tension, the less work required to generate foam with the same total surface area, and the better the foaming property [51][52][53]. From the graph, it can also be seen that the half-life time of CnEO-5 increases with the increase of alkyl chain length.…”

Fabrication of Cu2O-loaded TiO2 nanotubes with heterojunctions via an electrochemical method: enhanced photocatalytic activity

“…The energy shortage crisis and environmental pollution caused by fossil fuels are critical issues that need to be resolved urgently to achieve sustainable development. [1][2][3][4][5][6] Photocatalytic technologies are considered to be effective methods for overcoming these issues, because clean hydrogen energy can be obtained via water splitting on a photoanode under solar irradiation. [7][8][9][10] In the early 1970s, Honda and Fujishima reported hydrogen production on a TiO 2 electrode under UV-light irradiation.…”