CoFeP hollow cube as advanced electrocatalyst for water oxidation

Abstract

CoFeP nanocages exhibit OER catalytic activities with low overpotential (180 mV at 10 mA cm−2), small turnover frequency (0.93 s−1 at overpotential of 270 mV) and superior stability, due to synergistic effect between Co and Fe active sites and structure advantages.

Morphology and Composition Regulation of FeCoNi Prussian Blue Analogues to Advance in the Catalytic Performances of the Derivative Ternary Transition‐Metal Phosphides for OER

“…And, there is only one peak corresponded to P−O species in P 2p spectrum (Figure S12h). The above results indicate the formation of corresponding metal oxides/oxyhydroxides on the catalyst surface during OER process, which is good for OER performance improvement, as previous work reported …”

“…Prussian blue analogue (PBA), as a class of porous material with high content of transition‐metal ions and rich −CN ligands, is an ideal precursor for synthesizing porous C and N doped TMP. Recently, PBAs derived TMPs have developed rapidly and performed good activities in OER, such as N‐doped C/Ni 5 P 4 /Fe 3 P hollow nanocubes, (Ni x Fe 1–x ) 2 P nanocubes, (NiCo) 2 P nanocubes, CoFeP hollow cube, NiCoFeP nanocubes, O‐doped NiFe−P nanocube arrays on Ni foam, etc. However, most TMPs derived from PBAs are bimetallic phosphides at present and they are mostly limited to the cubic structure, because most PBAs precursors are dominated by cubic structure exposed by {100} facets with containing binary transition‐metal ions.…”

Co2‐xRhxP Nanoparticles for Overall Water Splitting in Basic Media: Activation by Phase‐Segregation‐Assisted Nanostructuring at the Anode

“…Inspired by the fact that pure Rh 2 P nanoparticles have not only been found to be highly active towards HER in acidic media but also in neutral and basic media, [15,16,22,23] in the present contribution we demonstrate the use of Co 2‐x Rh x P nanoparticles as electrocatalysts for HER in basic media. Our experimental design is based on the fact that diluting rhodium with cobalt ions in the Rh 2 P structure not only lowers the cost of the material but may also lead to catalytic synergism, as has been found in related bimetallic phosphides [24–27] . Our previous study already showed that cobalt‐rich Co 2‐x Rh x P nanoparticles were best suited for the OER process in basic media; the current work presents the HER activity of different compositions of Co 2‐x Rh x P nanoparticles in basic media, and demonstrates that these ternary phase nanoparticles can be used in the alkaline water electrolysis process, where the most active compositions for OER and HER are used as the anode and cathode electrocatalysts, respectively.…”

Realizing electrochemical transformation of a metal–organic framework precatalyst into a metal hydroxide–oxy(hydroxide) active catalyst during alkaline water oxidation

“…2,6,[20][21][22][23][24][25][26][27][28][29][30][31][32][33] In this respect, transition metal-based MOF-derived hydroxides, oxides, phosphides, chalcogenides, etc., have been demonstrated with promising electrochemical water oxidation activity. [34][35][36][37][38][39][40][41][42][43][44][45] Comprising a large electrochemical surface area, exposed facets, an increased number of active sites, and tunable electronic properties, MOFderived catalysts have attained special attention for electrochemical processes. For example, NiCo-PBA derived Ni x Co 3Àx O 4 demonstrated 10 mA cm À2 current density for the OER at only 287 mV overpotential.…”