3D ordered mesoporous cobalt ferrite phosphides for overall water splitting

Abstract

Developing low-cost and earth-abundant electrocatalysts with high performance for electrochemical water splitting is a challenging issue. Herein, we report a facile and effective way to fabricate three-dimension (3D) ordered mesoporous Co 1−x Fe x P (x=0, 0.25, 0.5, 0.75) electrocatalyst. Benefiting from 3D ordered mesoporous pore channels and composition optimization, the Co 0.75 Fe 0.25 P exhibits excellent electrocatalytic activities with low overpotentials of 270 and 209 mV at 10 mA cm −2 for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively, in the alkaline electrolyte along with a durable electrochemical stability. In addition, as both the cathode and anode, the Co 0.75 Fe 0.25 P also exhibits superior electrolysis water splitting performance with only an applied voltage of 1.63 V to attain a current density of 10 mA cm −2 without obvious decay for 18 h, indicating that the Co 0.75 Fe 0.25 P is an efficient electrocatalyst for overall water splitting.

Hollow cobalt-nickel phosphide nanocages for efficient electrochemical overall water splitting

“…In recent years, transition-metal oxides and corresponding transition metal phosphides [21][22][23][24], sulfides [25,26], nitrides [27,28], and selenides [29][30][31] have been extensively studied as non-precious bi-functional electrocatalysts for overall water-splitting. In particular, transition metal phosphides, especially bimetallic transition metal phosphides have attracted significant attentions as bi-functional electrocatalysts for water-splitting owing to their remarkably enhanced catalytic activities [32,33].…”

A Trimetallic Cobalt/Iron/Nickel Phytate Catalyst for Overall Water Splitting: Fabrication by Magnetic‐Field‐Assisted Bipolar Electrodeposition

“…The spectra further show P−O vibrations in the region 1300–1800 cm −1 . The band at 1050–1150 cm −1 may be assigned to the phosphate group [7,26b] . The frequency band of 400–900 cm −1 is attributed to metal‐oxygen vibrations [26a,b] .…”

“…Firstly, owing to the uneconomical disadvantage of the noble metal catalysts (Pt/C and RuO 2 ) for overall water splitting, developing the dual‐function transition metal materials such as metal oxides, [3] sulfides, [4] nitride compounds [5] and phosphates composites [6] are very crucial. Additionally, compared with mono‐metal complexes, polymetallic complexes have been proved to show richer faraday redox, higher conductivity and stability due to the optimization of their electronic structure [7] . Nickel is a promising catalyst material, such as Ni‐transition metal alloy electrodes with Co, [8] V, [9] Fe, [10] Mo [11] and Cu [12] .…”

“…Additionally, compared with mono-metal complexes, polymetallic complexes have been proved to show richer faraday redox, higher conductivity and stability due to the optimization of their electronic structure. [7] Nickel is a promising catalyst material, such as Ni-transition metal alloy electrodes with Co, [8] V, [9] Fe, [10] Mo [11] and Cu. [12] This is a way to enhance the electroactivity of Ni electrodes to the HER and OER.…”

NiMoCo layered double hydroxides for electrocatalyst and supercapacitor electrode

“…With the rapid development of human society, the demands for energy resources have become very imperious [1][2][3]. Currently, most of energy comes from traditional fossil fuels [4][5][6]. However, they might cause serious environmental pollution, and thus it is urgent to seek for alternative clean energy sources to solve the problem.…”