Hollow yolk-shell nanoboxes assembled by Fe-doped Mn3O4 nanosheets for high-efficiency electrocatalytic oxygen reduction in Zn-Air battery

Co-N-Doped Directional Multichannel PAN/CA-Based Electrospun Carbon Nanofibers as High-Efficiency Bifunctional Oxygen Electrocatalysts for Zn–Air Batteries

“…The parameters of Co-N@PCNFs-0.2 actually exceed those of most of the non-noble metal-based catalysts reported in the previous literature (Table S3). Furthermore, the Tafel slope of Co-N@PCNFs-0.2 (76 mV dec –1 ) is also less than that of the commercial 20 wt % Pt/C (78 mV dec –1 ), which further proves the excellent ORR reactive kinetics of Co-N@PCNFs-0.2 (Figure d). , …”

“…Furthermore, the Tafel slope of Co-N@PCNFs-0.2 (76 mV dec −1 ) is also less than that of the commercial 20 wt % Pt/C (78 mV dec −1 ), which further proves the excellent ORR reactive kinetics of Co-N@PCNFs-0.2 (Figure 5d). 7,11 We conducted the CV test at different RDE rotation rates (225−2025 rpm) to further evaluate the ORR diffusion kinetics of the catalyst (Figure 5e). The K−L plot (the inset of Figure 5e) drawn from the LSV curves shows a good linear relationship and a similar slope.…”

“…With the demand for green/sustainable development, the research and development of efficient, sustainable, and clean energy sources have become more and more urgent worldwide. − Zn–air batteries have become competitive battery candidates for portable energy storage devices because of high safety, low production cost, large capacity, and stable discharge curves. − However, the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) at the air electrode of Zn–air batteries exhibit apparent disadvantages such as slow kinetics and high overpotentials, which greatly hinder the commercialization of Zn–air batteries. − Although Pt, Ru, or Ir-based noble catalysts have extremely high catalytic performance, the disadvantages of scarcity and durability severely limit their large-scale use. , Correspondingly, nonprecious metal electrocatalysts with merits of a wide range of sources and low cost have received widespread attention. Therefore, the effective and rational construction of nonprecious metal bifunctional oxygen catalysts presents high research prospects and commercial values. − …”

In situ phase-reconfiguration to synthesize Ru, B co-doped nickel phosphide for energy-efficient hydrogen generation in alkaline electrolytes

“…8–11 However, the sluggish reaction kinetics of the two half-reactions, particularly for the OER, severely limits the efficiency of hydrogen production, and then hinders the practical applications of hydrogen energy owing to the high cost. 12–14 In general, exploiting efficient electrocatalysts is considered as a promising approach to accelerate the catalytic efficiency, and then tremendous electrocatalysts are synthesized, such as metal phosphide, 15–19 metal carbide, 20–24 metal sulfide and boride. 25–28 Relatively, replacing the anodic OER process with easily oxidized species during water splitting is regarded as a prospective avenue to lower the cell voltage input.…”

Fabrication of Mn3O4-CeO2-rGO as Nanocatalyst for Electro-Oxidation of Methanol

“…Among the transition metal oxides, manganese oxides such as MnO 2 , Mn 2 O 3 , and Mn 3 O 4 have received significant attention in different applications due to their cost-effective, eco-friendly, and electrochemical properties [ 25 ]. For example, the development of metal oxides including Mn 3 O 4 nanoparticles [ 25 ], hollow-like Mn 3 O 4 nanostructures on graphene matrix [ 26 ], Fe-doped Mn 3 O 4 nanoboxes [ 27 ], and Ce-doped Mn 3 O 4 [ 28 ] for methanol oxidation, oxygen reduction, and oxygen evolution reactions has been considered by researchers.…”