Nickel‐doped Co₃O₄ electrocatalyst derived from bimetal zeolitic imidazolate frameworks for the oxygen evolution reaction of electrolysis

Abstract

Oxygen evolution reaction (OER), as a multi‐step coupled anode reaction, is more sluggish in kinetics than electrocatalytic hydrogen evolution reaction (HER). In order to overcome the potential barrier in OER, it is necessary to develop high‐efficient non‐noble metal catalysts for energy utilization. In this work, several NiCo‐ZIF materials with different molar ratios of Ni and Co were prepared by doping Ni2+ in the preparation of ZIF‐67 via a simple room temperature stirring method. After that, NiCo‐ZIF was calcined at 350°C in a muffle furnace to obtain corresponding Ni‐doped Co3O4 (Ni‐Co3O4). Ni‐Co3O4 catalyst exhibits a low overpotential (η ≈ 203 mV @10 mA cm−2), a small Tafel slope (111.0 mV dec−1) and prominent stability for OER in 1 M KOH solution, which is higher than for a commercially available Ir/C electrocatalyst (η ≈ 350 mV @10 mA cm−2). The higher electrochemical performance should be largely ascribed to the introduction of oxygen vacancies resulting from the Ni doping, which leads to the improved electrochemical active surface area (122.81 mF cm−2) and the topological structure of the dodecahedron, which is in favor of the good contact area between the catalyst and the electrolyte. The design and synthesis of ZIF‐derived catalyst in this work create a significative method to prepare efficient OER electrocatalysts.

S-Scheme Heterojunction Based on Resorcinol–Formaldehyde Resin Nanosheets and Bi-Based Metal–Organic Frameworks for Efficient Photocatalytic H2O2 Production

“…Figures S9c,d and e display the ECSA for RF, Bi-MOF, and RF/Bi/B-0.3. The ECSA of these catalysts is determined by C dl , calculated based on the CV curves from the non-Faradaic potential range Figure f illustrates that the C dl values of RF, Bi-MOF, and RF/Bi/B-0.3 at −0.15 V are 1.88, 2.67, and 3.64 mF/cm 2 , respectively.…”

“…The ECSA of these catalysts is determined by C dl , calculated based on the CV curves from the non-Faradaic potential range. 55 Figure 7f illustrates that the C dl values of RF, Comparative experiments were conducted under different conditions to investigate the effects of the photocatalyst, oxygen, and light illumination on H 2 O 2 production. Results in Figure 8a demonstrate that H 2 O 2 was not observed in dark and catalystfree conditions, indicating that light and catalysts are essential for H 2 O 2 production.…”

Advances in zeolitic-imidazolate-framework-based catalysts for photo-/electrocatalytic water splitting, CO2 reduction and N2 reduction applications

“…Wrapping a layer of highly conductive π-π-conjugated organic molecules (HHTP) on trimetallic ZIF, Li et al formed NiZnCoZIF@HHTP heterostructure, which maintained an exceptionally stable OER performance over 1000 cycles and a six-hour durability test in 1 M KOH solution. 42 Li et al incorporated layered double hydroxide (LDH) into ZIF-67. 11 The resulting Co-LDH@ZIF-67 core-shell heterostructure displayed an overpotential of 187 mV at a current density of 10 mA cm −2 under alkaline conditions, with electrochemical stability of more than 50 hours.…”

Prussian blue analog‐derived bimetallic phosphide nanoparticles anchored in nitrogen‐doped porous electrospun carbon nanofibers for efficient oxygen evolution reaction

“…[9][10][11][12][13] Some noble metal oxides as electrocatalysts, such as Ir and Ru oxides, can significantly promote the OER kinetics, whereas their high price and lack of availability have seriously restricted their large-scale applications. [14][15][16][17][18][19] Therefore, developing OER electrocatalysts with rich reserve, low price, effective catalytic ability, and excellent durability is promising. [20][21][22] Among various non-noble metals, transition metal phosphides (TMPs), with the merits of abundant reserves, distinctive structure, metal-like electrical properties, and variable composition, have been extensively investigated in electrocatalytic materials.…”

“…Considering that, efficient OER electrocatalysts are desirable to facilitate reaction kinetics and reduce overpotential 9–13 . Some noble metal oxides as electrocatalysts, such as Ir and Ru oxides, can significantly promote the OER kinetics, whereas their high price and lack of availability have seriously restricted their large‐scale applications 14–19 . Therefore, developing OER electrocatalysts with rich reserve, low price, effective catalytic ability, and excellent durability is promising 20–22 …”