Boosting alkaline water splitting and the urea electrolysis kinetic process of a Co₃O₄ nanosheet by electronic structure modulation of F, P co-doping

Abstract

Designing non-precious metal electrocatalysts for accelerated electron transfer and richer active site exposure is necessary and challenging to achieve the versatility of electrocatalysts. In this research, a self-grown nanosheet array...

Coherent Design of CoAl Layered Double Hydroxide-Derived Co3O4 Cubes as a Competent Electrocatalyst for Water Splitting and Urea Electrolysis

“…The high-resolution O 1s spectrum showed three peaks corresponding to the lattice oxygen (529.8 eV), the metal oxygen bond of the Co 3 O 4 cube (531.7 eV), and the surface-adsorbed oxygen of the Co 3 O 4 cube (534.2 eV) (Figure c and Figure S3d). , The distinguishing peaks of the lattice Co–O band, adsorbed oxygen bond, and surface defect oxygen of CoAl-LDH and Co 3 O 4 confirmed the cube formation, which is responsible for the structurally converted Co 3 O 4 cube materials from CoAl-LDH.…”

“…Hydrogen is considered a clean energy source since its combustion produces water. − Electrochemical water splitting, which generates hydrogen, is gaining traction and auspicious technology owing to its eco-friendly characteristic and minimal energy requirements . The oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) comprise the two-stage practice. − However, OER at the anode is hindered by four-electron transfers leading to sluggish reaction kinetics . Consequently, the cell voltage of electrolytic water surpasses the optimal 1.23 V due to the electrode overpotential, which is inefficient for energy-efficient hydrogen generation.…”

Bifunctional Electrocatalysts for Overall and Hybrid Water Splitting

“…For example, Du and coworkers synthesized F, P codoped Co 3 O 4 nanosheet array on nickel foam (F−P− Co 3 O 4 /NF) as a bifunctional electrocatalyst for UOR-paired HWS in 1.0 M KOH containing 0.5 M urea, with a low cell voltage of 1.427 V to achieve 10 mA cm −2 . 676 DFT calculations revealed that codoping of F and P optimizes the electronic structure and hydrogen adsorption, jointly promoting the electrocatalytic activities. Cao and coworkers reported amorphous Ni−S−Se/NF with high bifunctional electrocatalytic activities for UOR and HER.…”

“…Additionally, binary-nonmetal modification has been reported to show synergism as well, − similar to that in bimetal electrocatalysts. For example, Du and coworkers synthesized F, P codoped Co 3 O 4 nanosheet array on nickel foam (F–P–Co 3 O 4 /NF) as a bifunctional electrocatalyst for UOR-paired HWS in 1.0 M KOH containing 0.5 M urea, with a low cell voltage of 1.427 V to achieve 10 mA cm –2 . DFT calculations revealed that codoping of F and P optimizes the electronic structure and hydrogen adsorption, jointly promoting the electrocatalytic activities.…”

Circumventing Challenges: Design of Anodic Electrocatalysts for Hybrid Water Electrolysis Systems

“…Favorable adsorption and desorption energies of reactants and products were thus optimized for higher HER and UOR electrocatalytic activities (Figure 14m–o). Additionally, other works of Ru‐doping in Ru‐Co 2 P/N‐C/NF [ 151 ] and NiFeRu‐LDH, [ 152 ] V‐doping in Fe, V‐NiS/NF, [ 153 ] V‐FeNi 3 N/Ni 3 N, [ 154 ] NiMoV LDH/NF [ 155 ] and V‐Ni 3 N/NF, [ 156 ] Fe‐doping in CoNiFeS‐OH, [ 157 ] P doping in F‐P‐Co 3 O 4 , [ 158 ] F‐doping in F‐Ni(OH) 2 [ 159 ] were also recently reported, inducing electrocatalytic UOR activity enhancement in different catalyst systems.…”