Tungsten Nitride‐Cobalt Anchored in N‐Doped Ordered Porous Carbon as an Efficient Oxygen Reduction Reaction Electrocatalyst

Abstract

We prepared a non-precious-metal tungsten nitride-cobalt (WN-Co) electrocatalyst anchored in nitrogen-doped ordered porous carbon (NOPC) through an in situ method. The WN-Co/NOPC electrocatalyst possesses good oxygen reduction reaction (ORR) capability in alkaline media, including a high onset potential of -132 mV, a dominant four-electron process, and a superior stability (onset potential and limiting current density were almost unchanged after 5000 cycles in 0.1 m KOH). The improved ORR performance was comparable to that of WN/NOPC and Co/NOPC with regard to three aspects: the even dispersion and uniform size of electrocatalyst particles provide more reactive sites; the nitrogen doping, high specific surface area and highly ordered mesoporous channel of catalyst support (NOPC) are conducive to the infiltration of the electrolyte; the existence of WN reinvests the catalyst with good stability, and the anchored configuration of WN and Co in the NOPC will prevent the particles from agglomerating after a long-term cycle, thereby improving the stability of the catalyst particles.

Cobalt‐Doped Perovskite‐Type Oxide LaMnO3 as Bifunctional Oxygen Catalysts for Hybrid Lithium–Oxygen Batteries

“…In recent years, environmental pollutiona nd energy issues caused by the consumption and depletion of fossil fuels have increasingly hindered the coordinated development of the economy ands ociety.T hus, much effort has been made to seek some practical solutions, including solar cells, [1] lithiumion batteries, [2] rechargeable metal-air batteries or metaloxygen batteries, [3,4] and fuel cells. [5,6] As an advanced energy storaged evice, the rechargeable hybrid LiÀO 2 battery hasa ttracted great attention owing to its high theoretical specific energy (5200 Wh kg À1 ,w hich is much highert han that of the lithium-ion battery), [7,8] low cost, and environmental friendliness. Although the rechargeable hybrid LiÀO 2 battery is attractive, somep roblems still severely limit its popularization in practice, [9][10][11][12] such as the inherently sluggishk inetics of the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) on the surfaceo ft he anode.…”

“…In recent years, environmental pollution and energy issues caused by the consumption and depletion of fossil fuels have increasingly hindered the coordinated development of the economy and society. Thus, much effort has been made to seek some practical solutions, including solar cells, lithium‐ion batteries, rechargeable metal–air batteries or metal–oxygen batteries, and fuel cells . As an advanced energy storage device, the rechargeable hybrid Li−O 2 battery has attracted great attention owing to its high theoretical specific energy (5200 Wh kg −1 , which is much higher than that of the lithium‐ion battery), low cost, and environmental friendliness.…”

Highly Sensitive and Selective Dopamine Detection Utilizing Nitrogen‐Doped Mesoporous Carbon Prepared by a Molten Glucose‐Assisted Hard‐Template Approach

“…[1][2][3][4] Among various ordered mesoporous materials, ordered mesoporous carbons have been considered as promising candidates for a wide range of important applications, including catalysis, energy storage, sensing, adsorption, and so on. [5][6][7] To further enhance the performances, much effort has been devoted to introducing heteroatoms into the surface or frameworks of mesoporous carbons. Particularly, nitrogen-doped ordered mesoporous carbons (N-OMCs) are of significant interest because the introduction of nitrogen element not only enhances surface polarity, but also increases the electric conductivity.…”

“…During the past few years, ordered mesoporous materials have received a great deal of scientific and commercial interest due to their distinctive structure and properties, such as high specific surface area, controllable pore structure, uniform pore distribution, excellent physical/chemical properties . Among various ordered mesoporous materials, ordered mesoporous carbons have been considered as promising candidates for a wide range of important applications, including catalysis, energy storage, sensing, adsorption, and so on . To further enhance the performances, much effort has been devoted to introducing heteroatoms into the surface or frameworks of mesoporous carbons.…”

Metal‐Nitrogen‐doped Porous Carbons Derived from Metal‐Containing Ionic Liquids for Oxygen Reduction Reaction

“…Different compositions of precursors contribute to various heteroatom-doped CMs. [13,14] Among theseh eteroatoms, N, [15][16][17][18] S, [19,20] P [21] and transition metals (e.g. Fe, [16,22,23] Co, [24] Cu [25] )h ave shown positive effects on catalyzing ORR.…”