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

Abstract

Prussian blue analogues (PBAs) are mostly binary metallic compounds with a cubic structure, which greatly limits the structure and component of derived transition‐metal phosphides (TMPs) and affects their catalytic activities. This work focuses on regulating the morphology and composition of the PBA at the front‐end to optimize the OER performance of the derived TMP. By temperature control surfactant desorption ability, we obtain a series of ternary FeCoNi (FCN‐PBAs). With the increase of temperature, their morphologies change from truncated octahedrons to cubic octahedrons and truncated cubes, in which the Fe content basically remains unchanged and the Co/Ni ratio gradually decreased. Due to the synergistic effect among ternary TMPs, all phosphidation products (FCN‐P) exhibit better OER activities than RuO2, among which FCN‐40‐P shows the best performance. As confirmed by XPS analyses, the appropriate chemical composition enhances the oxidizabilityof TM species, promotes the chemical adsorption of OH−, and accelerates OER kinetics.

Prussian Blue Analogs and Their Derived Nanomaterials for Electrochemical Energy Storage and Electrocatalysis

“…Another ternary TMPs with different morphologies and Co/Ni ratio were synthesized and utilized as electrocatalysts for OER. [ 179 ] The optimal FCN‐40‐P sample with truncated octahedral shape composed of CoP, Ni 5 P 4 , and FeP showed the best OER performance with η 10 of 265 mV. The structure modulation stems from the temperature‐dependent surfactant desorption ability in the synthesis of FeCoNi PBAs.…”

Preparation of a Ni–Fe-based transition metal phosphide as an efficient electrocatalyst for the oxygen evolution reaction

“…14 Du et al prepared FeCoNi–P, which had remarkable OER activity. 15 Prussian blue (PB) (Fe 4 [Fe(CN) 6 ] 3 · x H 2 O, x = 14–16) was discovered in the 18th century and was the first artificial coordination polymer. 16 Prussian blue (PB), Prussian blue analogs (PBAs) and their derivatives have demonstrated potential use in numerous domains, particularly in catalysis, and have attracted considerable attention.…”

Enhanced Electrochemical Water Oxidation Activity by Structural Engineered Prussian Blue Analogue/rGO Heterostructure

“…PBAs have also been reported to be used directly as electrocatalysts. For example, D. Jason Riley et al used anodic oxidation to create NiCo@A-NiCo-PBA core-shell structure [ 17 ], while Zhu et al increased OH − adsorption at the reaction site by modulating the morphology and components of FeCoNi ternary PBA composites [ 18 ]. However, PBA has a poor charge transfer capacity, which restricts its intrinsic catalytic efficacy.…”

“…High-resolution Ni 2p and Fe 2p spectra of PBA NiFe 2-1, respectively; Table S1: catalyst performance of analogous materials; Table S2: the calculated C dl ECSA values of as-obtained PBA materials. References [ 18 , 17 , 19 , 43 , 44 ] are cited in Supplementary Material.…”