Prussian blue analogues derived Fe-NiCoP reveals the cooperation of Fe doping and phosphating for enhancing OER activity

Rational Construction of a 3D Self-Supported Electrode Based on ZIF-67 and Amorphous NiCoP for an Enhanced Oxygen Evolution Reaction

“…Similarly, the Co 2p binding energy of NiCoP/ZIF-67/NF is higher than that of ZIF-67/NF, suggesting that NiCoP also possesses the capability to regulate the electronic structure of ZIF-67 (Figure c). , At the same time, by comparing with Co 2p and Ni 2p of NiCoP/ZIF-67/NF and NiP/ZIF-67/NF, the experimental results show that the binding energy of Co 2p and Ni 2p can be further shifted positively by the introduction of a Co source in phosphide, indicating that there is also an electron interaction between Co and Ni within NiCoP . As for the XPS of P 2p, the binding energy of P 2p was negatively shifted under the synergistic effect of ZIF-67 and NiCoP and the interaction of Ni and Co in NiCoP (Figure d) . The above analyses revealed that the electrons transfer from Co and Ni to P, resulting in an increased electron cloud density of P, thereby enhancing the adsorption capacity of *OH around Co and Ni, promoting the electron transfer and the formation of active sites, thus improving the catalytic activity of OER. , In conclusion, there is a strong interaction between NiCoP and ZIF-67, as well as between Ni and Co within NiCoP, which synergistically regulates the electronic structure of the material, making it more favorable to catalyze the OER than a single component.…”

“…(2) Benefiting from the good electrical conductivity of transition-metal phosphides, the NiCoP component can significantly improve the conductivity of the material, which can be proved by the LSV curves (Figure a). (3) There is a strong interaction between NiCoP and ZIF-67, as well as between Ni and Co within NiCoP, which synergistically regulate the electronic structure of NiCoP/ZIF-67/NF, making it more favorable to catalyze OER. , (4) The key to improving the catalytic activity of materials lies in the number and types of active sites. Therefore, the introduction of NiCoP can not only increase the number of Co active sites but also provide a second active site (Ni).…”

“…Transition-metal phosphides (TMPs) are a kind of electrocatalytic material that can effectively improve the electrical conductivity and regulate the electronic structure, thereby demonstrating significant potential in OER. , Meanwhile, the high electronegativity of P atoms enhances the positive charge on the metal, therefore facilitating the adsorption of *OH and reducing the energy barrier of the *OH adsorption step . Up to now, numerous studies have been conducted on TMPs for OER. , In 2023, Yuan’s group constructed a heterojunction comprising crystalline Ni 2 P and amorphous NiMoO x to enhance charge transfer and improve reaction kinetics .…”

“…27,28 Meanwhile, the high electronegativity of P atoms enhances the positive charge on the metal, therefore facilitating the adsorption of *OH and reducing the energy barrier of the *OH adsorption step. 29 Up to now, numerous studies have been conducted on TMPs for OER. 30,31 In 2023, Yuan's group constructed a heterojunction comprising crystalline Ni 2 P and amorphous NiMoO x to enhance charge transfer and improve reaction kinetics.…”

Internal and External Cultivation Strategy toward Efficient Electrochemical Oxygen Evolution in Cobalt Pentlandite

“…To address the above issues, there are two feasible approaches: (I) adjusting the electronic structure of cobalt pentlandite to optimize the interaction between catalytic sites and oxygen-containing intermediates; (II) modifying the surface of cobalt pentlandite catalysts to increase the number of active sites. , On the one hand, the direct use of high-valence metal cations doping such as V 3+ , W 6+ , and Mo 6+ ions have been proven to adjust the local coordination environment electronic structure, and accelerate electron transfer kinetics, leading to an optimized OER catalytic activity . Li et al designed and synthesized a novel Vanadium­(V) doped NiFe LDH, which exhibited excellent catalytic activity.…”