Porous rod-like Ni2P/Ni assemblies for enhanced urea electrooxidation

Abstract

The urea oxidation reaction has attracted increasing attention. Here, porous rod-like Ni 2 P/Ni assemblies, which consist of numerous nanoparticle subunits with matching interfaces at the nanoscale have been synthesized via a simple phosphating approach. Density functional theory calculations and density of states indicate that porous rod-like Ni 2 P/Ni assemblies can significantly enhance the activity of chemical bonds and the conductivity compared with NiO/Ni toward the urea oxidation reaction. The optimal catalyst of Ni 2 P/Ni can deliver a low overpotential of 50 mV at 10 mA•cm −2 and Tafel slope of 87.6 mV•dec −1 in urea oxidation reaction. Moreover, the constructed electrolytic cell exhibits a current density of 10 mA•cm −2 at a cell voltage of 1.47 V and an outstanding durability in the two-electrode system. This work has provided a new possibility to fabricate metal phosphides-metal assemblies with advanced performance.

Nested hollow architectures of nitrogen-doped carbon-decorated Fe, Co, Ni-based phosphides for boosting water and urea electrolysis

“…This result demonstrated that NC-FNCP has a faster charge transfer rate and favorable OER kinetics. TOF as a considerable kinetic parameter can be used to depict the intrinsic activities of electrocatalysts [17].…”

“…To date, transition metal phosphides (TMPs), such as Ni 2 P [17,18], Fe 2 P [19], MoP [20] and CoP [21] have been attracted wide attention owing to their chemical stability, low-cost, and environmental friendliness [22]. Among them, nickel phosphide shows extraordinary electrocatalytic activity and stability for UOR [17,19,23].…”

“…To date, transition metal phosphides (TMPs), such as Ni 2 P [17,18], Fe 2 P [19], MoP [20] and CoP [21] have been attracted wide attention owing to their chemical stability, low-cost, and environmental friendliness [22]. Among them, nickel phosphide shows extraordinary electrocatalytic activity and stability for UOR [17,19,23]. Both experimental results and density functional theory (DFT) calculations have been demonstrated that the highvalence nickel species generated during the catalysis process plays a key role in improving the UOR activity [1,19,24].…”

Two‐dimensional MOFs: Design & Synthesis and Applications

“…In order to protect the environment, people are looking for the earth's resource rich and cost‐effective alternatives to meet the needs of electrochemical energy storage and conversion [40–43] . 2D MOF nanosheets were considered as model electrocatalysts in recent years.…”

Suppressing the metal-metal interaction by CoZn0.5V1.5O4 derived from two-dimensional metal-organic frameworks for supercapacitors

“…MOFs have unique physicochemical properties owing to their specific morphologies and high specific surface areas [29][30][31][32][33][34][35]. They reveal many advantages in gas separation, fluorescence sensing, catalysis, electrochemistry, and other fields [36][37][38]. For example, Bai et al [36] reported Ni/Co bimetallic MOF nanoplates, which exhibited excellent oxygen evolution reaction electrocatalytic activity with a low overpotential of 256 mV at 10 mA cm −2 and a small Tafel slope of 81.8 mV dec −1 in KOH with long-term electrochemical stability for 3000 cyclic voltammetry (CV) cycles.…”