Electrochemical Synergies of Heterostructured Fe2O3-MnO Catalyst for Oxygen Evolution Reaction in Alkaline Water Splitting

Abstract

For efficient electrode development in an electrolysis system, Fe2O3, MnO, and heterojunction Fe2O3-MnO materials were synthesized via a simple sol–gel method. These particles were coated on a Ni-foam (NF) electrode, and the resulting material was used as an electrode to be used during an oxygen evolution reaction (OER). A 1000-cycle OER test in a KOH alkaline electrolyte indicated that the heterojunction Fe2O3-MnO/NF electrode exhibited the most stable and highest OER activity: it exhibited a low overvoltage (n) of 370 mV and a small Tafel slope of 66 mV/dec. X-ray photoelectron spectroscopy indicated that the excellent redox performance contributed to the synergy of Mn and Fe, which enhanced the OER performance of the Fe2O3-MnO/NF electrode. Furthermore, the effective redox reaction of Mn and Fe indicated that the structure maintained stability even under 1000 repeated OER cycles.

Manganese‐Doped Hollow Layered Double (Ni, Co) Hydroxide Microcuboids as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

“…It can be seen that the electrochemical activity based on the ECSA of NiCoMn‐LDH, Ni 3 Co 5 Mn‐LDH and Ni 6 Co 11 Mn‐LDH are better than that of the NiCo 2 ‐LDH, which further demonstrates that Mn doping can enhance the catalytic activity of NiCo based LDH. As shown in Figure d and Table S3, the Ni 6 Co 11 Mn‐LDH catalyst outperforms most of advanced transition metal OER catalysts . To further gain insight into the effect of Mn doping on the kinetics property, we use electrochemical impedance spectroscopy (EIS) to investigate the interfacial charge transfer during OER.…”

“…As shown in Figure 3d and Table S3, the Ni 6 Co 11 Mn-LDH catalyst outperforms most of advanced transition metal OER catalysts. [13,[34][35][36][37][38][39][40][41][42][43] To further gain insight into the effect of Mn doping on the kinetics property, we use electrochemical impedance spectroscopy (EIS) to investigate the interfacial charge transfer during OER. As shown in Figure introduced in the experimental section.…”

Deep Eutectic Solvent‐Mediated Construction of Oxygen Vacancy‐Rich Fe‐Based Electrocatalysts for Efficient Oxygen Evolution Reaction

“…The overpotential of OV‐Fe‐DES is also compared with other Fe‐based catalysts reported in recent literatures. For examples, NiFe oxyphosphide spheres [ 43 ] (253 mV), Fe 7 S 8 24 (270 mV), Fe 2 O 3 ‐MnO [ 44 ] (370 mV), Fe 2 O 3 /carbon nanotube [ 31 ] (383 mV), and Fe@N‐doped graphene/N‐doped carbon nanotubes [ 29 ] (450 mV) deliver higher overpotential than OV‐Fe‐DES at the current density of 10 mA cm −2 (Table S1, Supporting Information). Moreover, the overpotentials of OV‐Fe‐DES at the current density of 50 mA cm −2 (285 mV) and 100 mA cm −2 (298 mV) are much lower than those of other samples, demonstrating that the excellent catalytic activity of OV‐Fe‐DES is independent of the current density.…”

Preparation and characterization of ZnFe2O4 on the microstructures and magnetic properties

“…Penambahan ZnO pada Fe2O3 dapat menaikkan sifat kristalinitas, energi gap dan sifat magnetik (Khayatian et al, 2016). Kim et al (2019) melaporkan penambahan MnO pada Fe2O3 sebagai katalis mampu diaplikasikan dalam pemisahan air dan sebagai katalis (Dolgykh et al, 2014). Aliah et al (2018) juga melaporkan sintesis material keramik ferit untuk aplikasi sensor, hasil optimum sensitivitas sensor didapat sebesar 47,41%.…”