Hierarchical Porous NC@CuCo Nitride Nanosheet Networks: Highly Efficient Bifunctional Electrocatalyst for Overall Water Splitting and Selective Electrooxidation of Benzyl Alcohol

Abstract

Highly active and stable bifunctional electrocatalysts for overall water splitting are important for clean and renewable energy technologies. The development of energy-saving electrocatalysts for hydrogen evolution reaction (HER) by replacing the sluggish oxygen evolution reaction (OER) with a thermodynamically favorable electrochemical oxidation (ECO) reaction has attracted increasing attention. In this study, a self-supported, hierarchical, porous, nitrogen-doped carbon (NC)@CuCo 2 N x /carbon fiber (CF) is fabricated and used as an efficient bifunctional electrocatalyst for both HER and OER in alkaline solutions with excellent activity and stability. Moreover, a two-electrode electrolyzer is assembled using the NC@CuCo 2 N x /CF as an electrocatalyst at both cathode and anode electrodes for H 2 production and selective ECO of benzyl alcohol with high conversion and selectivity. The excellent electrocatalytic activity is proposed to be mainly due to the hierarchical architecture beneficial for exposing more catalytic active sites, enhancing mass transport. Density functional theoretical calculations reveal that the adsorption energies of key species can be modulated due to the synergistic effect between CoN and CuN. This work provides a reference for the development of high-performance bifunctional electrocatalysts for simultaneous production of H 2 and high-value-added fine chemicals.

Electrochemical Oxidation of 5‐Hydroxymethylfurfural on Nickel Nitride/Carbon Nanosheets: Reaction Pathway Determined by In Situ Sum Frequency Generation Vibrational Spectroscopy

“…[17] There is no peak in the Raman spectrum of Ni 3 Ns ample in the Raman shift range of 1200 cm À1 to 1800 cm À1 (Figure 2b). [17] There is no peak in the Raman spectrum of Ni 3 Ns ample in the Raman shift range of 1200 cm À1 to 1800 cm À1 (Figure 2b).…”

“…Forschungsartikel ulting from the first-order scattering of the E2g mode of sp 2 carbon domains. [17] There is no peak in the Raman spectrum of Ni 3 Ns ample in the Raman shift range of 1200 cm À1 to 1800 cm À1 (Figure 2b). On the contrary,the Raman spectrum of Ni 3 N@C exhibits two peaks at 1590 and 1359 cm À1 ,s uggesting the existence of carbon in the hybrid material.…”

Ni Strongly Coupled with Mo2C Encapsulated in Nitrogen‐Doped Carbon Nanofibers as Robust Bifunctional Catalyst for Overall Water Splitting

“…This result demonstrates that the coupling of Ni and Mo 2 C promotes the formation of small sized Ni and Mo 2 C NPs. [56] In addition, with the increment of Ni content, the I D /I G value decreases gradually. [26] Because the proportion of Mo 2 C in Ni/Mo 2 C(1:2)-NCNFs is the largest compared to other samples, all the characteristic peaks of Mo 2 C can be observed in the XRD patterns.…”

Cobalt Nickel Nitrogen Array as a Easily Eecoverable, Effective Catalyst for Liquid‐Phase Catalytic Reaction with Remarkable Recycled Stability

“…have attributed the good performance of NiCoP structure to favorable electronic states resulting from the synergistic interplay between nickel and cobalt . Zheng et al have revealed that the adsorption energies of key species can be modulated due to the synergistic effect between Co and Cu in CoCuN catalysts . Liang et al have suggests that construction of bimetallic compound could effectively alter the electronic structure tune the hydrogen (or water) adsorption energy, thus dramatically enhance the catalytic activity .…”