Controlled Anisotropic Growth of Co‐Fe‐P from Co‐Fe‐O Nanoparticles

Abstract

A facile approach to bimetallic phosphides, Co-Fe-P, by a high-temperature (300 °C) reaction between Co-Fe-O nanoparticles and trioctylphosphine is presented. The growth of Co-Fe-P from the Co-Fe-O is anisotropic. As a result, Co-Fe-P nanorods (from the polyhedral Co-Fe-O nanoparticles) and sea-urchin-like Co-Fe-P (from the cubic Co-Fe-O nanoparticles) are synthesized with both the nanorod and the sea-urchin-arm dimensions controlled by Co/Fe ratios. The Co-Fe-P structure, especially the sea-urchin-like (Co(0.54)Fe(0.46))2P, shows enhanced catalysis for the oxygen evolution reaction in KOH with its catalytic efficiency surpassing the commercial Ir catalyst. Our synthesis is simple and may be readily extended to the preparation of other multimetallic phosphides for important catalysis and energy storage applications.

Free‐Sustaining Three‐Dimensional S235 Steel‐Based Porous Electrocatalyst for Highly Efficient and Durable Oxygen Evolution

“…This suggests that an activation process occurs in the initial 4000 so ft he stabilitym easurements, during whicht ime iron phosphide is converted into the OER-active Fe oxide species. The OER-based overpotentialo f3DS235-P steel (h 10 = 326 mV) is lower than those of other Fe-based catalysts recentlyr eported, such as FeP nanorodsd ispersed on carbon fiber paper (h 10 = 350 mV), [69] electrodeposited amorphous FeOOH( h 10 > 420 mV), [72] Nidoped FeOOH thin films (h 10 > 340 mV), [73] sea-urchin-like (Co 0.54 Fe 0.46 ) 2 P( h 10 = 370 mV), [74] Fe 2Àx Mn x Pn anorods (h 10 > 480 mV), [75] NiFeO x film (h 10 > 350 mV), [33] and exfoliated nanosheets of NiFe layered double hydroxides (h 10 > 350 mV) [76] ( Table S1). 3D S235-P steel (Figure 5c,r ed line) maintains sufficient current-voltage stability( % 1.556 Va t1 0mAcm À2 with average h = 326 mV) throughout the chronopotentiometry measurements, which suggestst hat the unique 3D porous structure contributes to the ease with which oxygen is released.…”

A Co2P/WC Nano‐Heterojunction Covered with N‐Doped Carbon as Highly Efficient Electrocatalyst for Hydrogen Evolution Reaction

“…[3][4][5] Pt-basedc atalysts perform well in the HER; however, because of the high cost and lowa bundance of Pt metal on earth, variousn onprecious-metal-based electrocatalysts have been designed to tackle these problems. [39][40][41][42][43][44][45] Nano-heterojunctions, which combine the advantages of nanomaterials and heterojunctions, have recently been employeda sanew type of electrocatalyst because of their unique physicochemical properties. Among them, transition-metal phosphides,e specially Co 2 P, have attracted considerable attention.…”

Construction of Hierarchical Co–Fe Oxyphosphide Microtubes for Electrocatalytic Overall Water Splitting

“…[23] During electrocatalytic water splitting, phosphorus in metal phosphides would be able to participate in the reaction through moderate bonding to the reaction intermediates and create surface with proton acceptor and hydride acceptor sites, leading to high activity. [27,28] In addition to tuning the cations in phosphide electrocatalysts, doping nonmetal anions is also an effective strategy to promote the electrochemical performance. [26] The introduction of hetero-metal cations can enhance the transfer of charges between different ions and modify the electronic structure of the material, which would lead to lower kinetic energy barriers for the electrochemical processes.…”