Cobalt phosphide supported by two-dimensional molybdenum carbide (MXene) for the hydrogen evolution reaction, oxygen evolution reaction, and overall water splitting

Abstract

CoP/Mo2CTx is prepared as efficient catalyst for HER, OER, and water splitting. DFT calculations revealed that it has optimal H* adsorption free energy and MXene plays a critical role to boost HER, while CoP is transformed into Co–OOH in OER.

Nanoporous CoP nanowire arrays decorated with carbon‐coated CoP nanoparticles: the role of interfacial engineering for efficient overall water splitting

“…In contrast, the post-OER sample still showed three peaks but with significantly reduced intensity (Figure 7E), confirming that CoP was converted into CoOOH, accordance with previous studies [56,60]. Figure 7F shows the high-resolution O 1s spectrum, and the peaks at 529.53, 531.1, and 533 eV correspond to the Co O bond, hydroxides, and adsorbed oxygen, respectively [57].…”

“…30‐0443). These results demonstrate that CoP is converted to (oxy)hydroxide, which is the real active species of OER [56‐58]. Raman spectra is also employed to investigate the changes of crystal structure and crystallinity for the CoP NWs/CoP NPs@NC/CC sample before and after OER.…”

“…After OER, the peak intensity at 670 cm −1 increased, while two new peaks were observed at 524 and 612 cm −1 . These three prominent peaks are related to (oxy)hydroxides, revealing possible phase transitions during OER [57,58]. XPS measurement was carried out to evaluate the chemical environment and element valence of CoP NWs/CoP NPs@NC/CC after the OER test.…”

Interfacial Strain‐Modulated Nanospherical Ni2P by Heteronuclei‐Mediated Growth on Ti3C2Tx MXene for Efficient Hydrogen Evolution

“…In this strategy, organic solvents (i.e., octadecene and oleylamine) are adopted to promote the adsorption, nucleation and growth of nickel phosphide toward numerous defects on the surfaces of nano Ti 3 C 2 T x MXene, which is different from the conventional synthesis of metal phosphide on MXene from a facile precipitation reaction and phosphorization process. [30][31][32] It was found that the significant tensile strain of the Ni 2 P lattice exists at the interface between Ni 2 P NSs and Ti 3 C 2 T x MXene. Our density functional theory (DFT) calculations show that the presence of interfacial strain between Ni 2 P and Ti 3 C 2 T x MXene shifts the hydrogen adsorption energy close to the optimal value (0.00 eV), which leads to the high HER activity.…”

Synergistic Effect of WN/Mo2C Embedded in Bioderived Carbon Nanofibers: A Rational Design of a Shuttle Inhibitor and an Electrocatalyst for Lithium–Sulfur Batteries

“…Therefore, TMCs and TMNs present promising catalytic functions in tuning the kinetic features of the Li–S system. Furthermore, these compounds are considered proper adsorbents through forming metal–sulfide bonds with moderate adsorptive energy, in case where excessive immobilization of the intermediate will impair the continuous electrochemical reaction due to the sluggish redox kinetics. − A heterojunction, in combination of two materials with separate electronic structures, has been widely used in regulation of electrical properties of semiconductors. − The design concept of a heterostructure can also be utilized in electrochemical devices and has attracted much attention. Due to modulation of two different materials at the molecular level, the heterostructure combines the merits of the two and further activates new features at the reactive heterointerface.…”