Constructing a Rod‐like CoFeP@Ru Heterostructure with Additive Active Sites for Water Splitting

Abstract

Interfacial engineering and defect modulation can provide abundant active sites for catalysts to further boost the catalysis process. In this work, we develop a strategy to grow multiheterogeneous cobalt phosphide (CoP) nanorods with rich interfaces and defects along the one-dimensional (1D) nanostructure by dual incorporation of Fe and Ru (CoFeP@Ru). Such a catalyst exhibits high activity and stability towards the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), with overpotentials of only 38 mV in 0.5 M H 2 SO 4 and 48 mV in 1.0 M KOH for HER, and an overpotential of 340 mV in 0.1 M KOH for OER at 10 mA cm À 2. Finally, as the bifunctional catalyst, an alkali electrolyzer is assembled and delivers at a low cell voltage, with almost 100 % Faradaic efficiency. Our experimental results demonstrate that Fe incorporation can disturb or even break the periodic structure of cobalt phosphides, causing a redistribution of the electronic structure and electron density of activity sites, while Ru can significantly enhance the catalytic kinetics, as well as electrochemical and mechanical stability.

Ultrafast Microwave Synthesis of Ru-Doped MoP with Abundant P Vacancies as the Electrocatalyst for Hydrogen Generation in a Wide pH Range

“…60,61 For P 2p, the peaks at around 129.5 eV/130.4 eV are assigned to the Mo−P bond, 62,63 and the peak of P−O is located at 133.6 eV 64 (Figure 2c). For Ru 3p, the peaks at 461.4 and 483.7 eV are assigned to Ru (0) 65,66 (Figure 2d). The results demonstrate that the introduction of Ru and P vacancies can synergistically modify the electron density of MoP to optimize the reaction kinetics.…”

“…For Mo 3d in Ru-MoP-P V (Figure b), the peaks at 228.2, 230.9, 231.4, and 234.5 eV are attributed to Mo δ+ (0< δ < 4) species of MoP. − The characteristic peaks at 232.9 eV and 236.3 eV are attributed to Mo 6+ due to the slight oxidation of MoP in the air. , For P 2p, the peaks at around 129.5 eV/130.4 eV are assigned to the Mo–P bond, , and the peak of P–O is located at 133.6 eV (Figure c). For Ru 3p, the peaks at 461.4 and 483.7 eV are assigned to Ru (0) , (Figure d). The results demonstrate that the introduction of Ru and P vacancies can synergistically modify the electron density of MoP to optimize the reaction kinetics.…”

Rational design of hierarchical MOF ‐derived CoP @ Co‐Fe LDH bifunctional electrocatalyst: An approach toward efficient overall water splitting in alkaline media

“…It should also be noted that the high OER, HER, and overall water splitting activity of the hierarchical CoP@Co‐Fe LDH 25s are comparable with or even better than those of reported highly promising catalysts (Tables S2‐S4). 48‐78 To the best of our knowledge, the hierarchical CoP@Co‐Fe LDH 25s is one of the best performing electrocatalysts thus far studied. It successfully meets the strict standards for the large‐scale commercialization of alkaline overall water splitting electrolyzers.…”

Recent advances in Ru-based electrocatalysts for oxygen evolution reaction

“…Normally, synergistic effects associated with incorporation of Ru and other materials, such as metals, oxides, sulfides, phosphides and carbons into heterostructured catalysts effectively improve electrocatalytic activities and stabilities. 35,127–129…”