Facile synthesis of Co and Ce dual-doped Ni3S2 nanosheets on Ni foam for enhanced oxygen evolution reaction

Abstract

Developing efficient and stable oxygen evolution reaction (OER) electrocatalysts via doping strategy has well-documented for electrochemical water splitting. Herein, a homogeneous structure (denoted as Co/Ce-Ni 3 S 2 /NF) composed of Co and Ce dual doped Ni 3 S 2 nanosheets on nickel foam was synthesized by a facile one-step hydrothermal method. Co and Ce dopants are distributed inside the host sulfide, thereby raising the active sites and the electrical conductivity. Besides, the CeO x nanoparticles generated by part of the Ce dopants as a cocatalyst further improve the catalytic activity by adding defective sites and enhancing the electron transfer. As a consequence, the obtained Co/Ce-Ni 3 S 2 /NF electrode exhibits better electrocatalytic activity than single Co or Ce doped Ni 3 S 2 and pure Ni 3 S 2 , with low overpotential (286 mV) at 20 mA•cm −2 , a small Tafel slope and excellent long-term durability in strong alkaline solution. These results presented here not only offer a novel platform for designing transition metal and lanthanide dual-doped catalysts, but also supply some guidelines for constructing catalysts in other catalytic applications.

W-Doped Ni3S2 Nanoparticles Modified with NiFeLa Hydroxide for Hydrogen Evolution

“…As shown in Figure S3a, Ni 2p level is split into Ni 2p 3/2 (856.0 eV) and Ni 2p 1/2 (873.8 eV) peaks, coupled with two satellite peaks, which demonstrates the Ni 2+ ions. Moreover, a weaker satellite peak of 852.7 eV could be attributed to the exposed NF matrix. , In Figure S3b, two identical peaks of W 4f 7/2 (35.1 eV) and W 4f 5/2 (37.2 eV) indicate the presence of W 6+ in W-Ni 3 S 2 –0.1/NF . In Figure S3c, the binding energy locations at 161.7, 163.1, 164.1, and 168.4 eV are related to the S 2p 3/2 , S 2p 1/2 , and C–S–C from TAA reactant and highly oxidized sulfur .…”

Recent Advances of CeO2‐Based Electrocatalysts for Oxygen and Hydrogen Evolution as well as Nitrogen Reduction

“…[102] Furthermore, Wu et al found that the Co and Ce dual-doped Ni 3 S 2 nanosheets outperformed those of single metal doped and undoped Ni 3 S 2 for OER electrocatalysis. [103] Experimental and theoretical results revealed that the Co, Ce dual doping can increase the active sites and conductivity by electronic structure modification.…”

Regulating the Local Spin State and Band Structure in Ni3S2 Nanosheet for Improved Oxygen Evolution Activity

“…to form heterostructures is also a common way to obtain high OER performance. In addition, Ni 3 S 2 has been doped by several heteroatoms to modulate the band structure for improved catalytic activity, such as N, [ 16 ] Cu, [ 17 ] Co, [ 18,19 ] Mn, [ 20 ] Fe, [ 21 ] Mo, [ 22 ] and others. Although these tactics can boost the OER activity of Ni 3 S 2 to some extent, further improvement relies on subtle design on the adsorption ability of *O and *OOH.…”