Rapid mass production of iron nickel oxalate nanorods for efficient oxygen evolution reaction catalysis

Abstract

NiFe layered-double-hydroxide (NiFe-LDH) and the NiFe metal–organic framework (NiFe-MOF) demonstrates the best catalytic activity among NiFe-based materials for the oxygen evolution reaction (OER), which is important for efficient hydrogen production....

Nanospike Nickel-Iron Oxalate as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

“…[7][8][9][10][11][12][13][14] More recently, several studies have explored the preparation of transition metal oxalates and their OER activity. [15][16][17][18][19][20][21][22] Zhang, Cao, and co-workers reported a nickel-iron oxalate nanomesh prepared by a solvothermal synthesis that exhibited small overpotential of 203 mV to reach 50 mV cm −2 in basic media. [16] The authors identified several important roles of oxalate for OER performance, including its electron-accepting ability to promote oxidation of the nickel-iron sites, its anionic character to stabilize the high-valent metal centers involved in OER, and its protonacceptor ability.…”

“…[17] Alternative preparation methods under milder conditions have led to different morphologies, including nanowires, nanosheets, and nanorods. [18,20,23] Herein, we report a nickel iron oxalate material with a nanospike morphology as an efficient electrocatalyst for OER. Notably, no oxalate source was utilized in the synthesis of this material, but rather the oxalate is formed in situ during material preparation, likely from oxidation of the glycerol solvent.…”

“…This differs from previous reports where oxalate, typically in the form of an oxalate salt or oxalic acid, is used. [15][16][17][18][19][20][21][22] The as-prepared amorphous oxalate material was subjected to mild heat treatment to obtain the bimetallic nanocrystalline samples. We show that the nanospike morphology delivers a low overpotential of 284 mV at 10 mA•cm −2 for OER, which is lower by 42 mV compared to the amorphous material and by 24 mV compared to state-of-thehttps://doi.org/10.26434/chemrxiv-2024-2rpfc ORCID: https://orcid.org/0000-0001-6444-6122 Content not peer-reviewed by ChemRxiv.…”

Surface Oxalate Coordination: Facilitating Basic OER Activity by Regulating the Electronic Structure of Fe–Ni3S2

“…Recently, novel transition metal oxalates have gradually gotten the attention of researchers due to their carbon circular economy and reversible electrochemical redox properties . In recent years, the Ai, Lei, Mahalingam, Wang, and Gao groups have successively reported monometallic or bimetallic oxalates with three-dimensional microstructures, such as rod-shaped CoC 2 O 4 , porous nanorod-like (Ni 0.5 Fe 0.5 )­C 2 O 4 , block Ni-CoC 2 O 4 , Fe-doped NiC 2 O 4 nanorods, and nanomesh array NiFe oxalate, and they all showed quite high OER catalytic activity. However, so far, morphology regulation and the introduction of heteroatoms are the main strategies used to promote the catalytic performance of oxalate.…”