Rapid Synthesis of Various Electrocatalysts on Ni Foam Using a Universal and Facile Induction Heating Method for Efficient Water Splitting

Abstract

Electrocatalytic water splitting for the production of hydrogen proves to be effective and available. In general, the thermal radiation synthesis usually involves a slow heating and cooling process. Here, a high‐frequency induction heating (IH) is employed to rapidly prepare various self‐supported electrocatalysts grown on Ni foam (NF) in liquid‐ and gas‐phase within 1–3 min. The NF not only serves as an in situ heating medium, but also as a growth substrate. The as‐synthesized Ni nanoparticles anchored on MoO2 nanowires supported on NF (Ni‐MoO2/NF‐IH) enable catalysis of hydrogen evolution reaction (HER), showing a low overpotential of −39 mV (10 mA cm−2) and maintaining the stability of 12 h in alkaline condition. Moreover, the NiFe layered double hydroxide (NiFe LDH/NF‐IH) is also synthesized via IH and affords outstanding oxygen evolution reaction (OER) activity with an overpotential of 246 mV (10 mA cm−2). The Ni‐MoO2/NF‐IH and NiFe LDH/NF‐IH are assembled to construct a two‐electrode system, where a small cell voltage of ≈1.50 V enables a current density of 10 mA cm−2. More importantly, this IH method is also available to rapidly synthesize other freestanding electrocatalysts on NF, such as transition metal hydroxides and metal nitrides.

Heterointerface Engineering of Hierarchically Assembling Layered Double Hydroxides on Cobalt Selenide as Efficient Trifunctional Electrocatalysts for Water Splitting and Zinc‐Air Battery

“…Besides the characteristic peaks of CoSe 2 , the other peaks can be assigned to the planes of CoNi LDH (JCPDS 33‐0429). [ 30,31 ] Simultaneously, the same characteristic peaks are observed in the XRD pattern of V‐CoSe 2 @CoNi LDH HNA (Figure S8, Supporting Information). The results demonstrate that CoSe 2 and CoNi LDH are successfully integrated.…”

“…Besides the characteristic peaks of CoSe 2 , the other peaks can be assigned to the planes of CoNi LDH (JCPDS 33-0429). [30,31] Simultaneously, the 2b), corresponding to Co 2p 3/2 and Co 2p 1/2 of Co-Se bond, [32,33] while the peaks at 779.1 and 794.3 eV of Co 2p 3/2 and Co 2p 1/2 belong to Co-O bond for CoNi LDH. Obviously, the binding energies of Co 2p 3/2 and Co 2p 1/2 for B-CoSe 2 @CoNi LDH are higher than that of B-CoSe 2 , but lower than that of CoNi LDH.…”

Underfocus Laser Induced Ni Nanoparticles Embedded Metallic MoN Microrods as Patterned Electrode for Efficient Overall Water Splitting

“…[ 3 ] High‐efficiency and ideal catalysts often required lower HER overpotential to maintain large current density. [ 4 ] A large number of studies had shown that precious metal‐based catalysts (i.e., Pt, RuO 2 , and IrO 2 ) possessed great activity in hydrogen production. Nevertheless, its scarcity and high price conformed to its limitation in large‐scale industrial productions.…”

Design of NiFe‐based nanostructures for efficient oxygen evolution electrocatalysis

“…By utilizing the high-frequency induction heating (IH), Xiong et al was synthesized NiFe layered double hydroxide loaded on Ni foam (NiFe LDH / NF-IH), which had a certain number of defects and provided excellent OER performance with an overpotential of 246 mV (10 mA/cm 2 ). [63]…”