Interface Engineering of Needle‐Like P‐Doped MoS₂/CoP Arrays as Highly Active and Durable Bifunctional Electrocatalyst for Overall Water Splitting

Abstract

Developing a bifunctional water splitting catalyst with high efficiency and low cost are crucial in the electrolysis water industry. Here, we report a rational design and simple preparation method of MoS 2-based bifunctional electrocatalyst on carbon cloth (CC). The optimized P-doped MoS 2 @CoP/CC catalyst presents low overpotentials for the hydrogen (HER) and oxygen evolution reactions (OER) of 64 and 282 mV in alkaline solution as well as 72 mV HER overpotential in H 2 SO 4 at a current density of 10 mA cm À 2. Furthermore, P-MoS 2 @CoP/CC as a bifunctional catalyst delivered relatively low cell voltages of 1.83 and 1.97 V at high current densities of 500 and mA cm À 2 in 30 % KOH. The two-electrode system showed a remarkable stability for 30 h, even outperformed the benchmark RuO 2 j j Pt/ C catalyst. The excellent electrochemical performance can be credited to the unique microstructure, high surface area, and the synergy between metal species. This study presents a possible alternative for noble metal-based catalysts to overcome the challenges of industrial applications.

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

“…The binding energy at 399.58, 400.75, and 401.84 eV can be ascribed to pyridinic N, pyrrolic N, and graphitic N, respectively [51]. In Figure 3F, the C1s spectrum can be fitted into C═C (284.81 eV), CN (285.86 eV), and CO (288.4 eV) [52].…”

Self-supported porous heterostructure WC/WO3−x ceramic electrode for hydrogen evolution reaction in acidic and alkaline media

“…The above experimental results showed that the WO 3−x whiskers produced by the reaction of WC with CO 2 should play an important role. The in situ developed WC/WO 3−x heterostructure interface synergistically modulated the electronic structure and the charge transfer, favoring the acceleration of the HER electrochemical process and the maintenance of high stability [22,60,61]. The appropriate number and diameter of WO 3−x in WC/WO 3−x -900 lead to the best HER performance.…”

Interfacial Electronic Coupling of NC@WO3‐W2C Decorated Ru Clusters as a Reversible Catalyst toward Electrocatalytic Hydrogen Oxidation and Evolution Reactions

“…Electrochemical impedance spectroscopic (EIS) results revealed that Ru/NC@WOC has relatively lower resistances than Ru/C and therefore a faster charge transfer. [34] We further show the Tafel plots of the kinetic current density (j k ) versus the overpotential (Figure 3b). The exchange-current density (j 0 ) was obtained from the micropolarization region (À 5 to 5 mV) by linear fitting through the Butler-Volmer equation.…”

“…It is shown that the highly efficient HER kinetics on the Ru/ NC@WOC follows the Volmer-Heyrovsky mechanism associated with the electrochemical desorption of hydrogen, which is the rate-limiting step. [34] The solution resistance reflects the impedance between the working electrode and the reference electrode circuit, which is mainly affected by changes in the experimental setup (Figure S12), while the charge transfer resistance mainly explores the conductivity of the catalyst. As illustrated in Figure 6c, Ru/NC@WOC shows a much smaller semicircle than that of commercial Pt/C and the Ru/C benchmark in complex-plane plot, demonstrating Ru/NC@WOC has a smaller charge transfer resistance with higher conductivity during the HER catalysis.…”