Manganese‐Doped Hollow Layered Double (Ni, Co) Hydroxide Microcuboids as an Efficient Electrocatalyst for the Oxygen Evolution Reaction

Abstract

The development of low-cost, efficient, noble-metal-free electrocatalysts for the oxygen evolution reaction (OER) is important for renewable energy conversion. We prepared hierarchical hollow NiCoMn-layered double hydroxide (LDH) microcuboids that consisted of two dimensional (2D) nanosheets by using a solvothermal method. The prepared Ni 6 Co 11 Mn-LDH exhibits high OER activity, with an overpotential of 248 mV at a current density of 10 mA cm À 2 and a small Tafel slope of 72.2 mV dec À 1 , which is even better than the noble-metal RuO 2 catalyst. It remains stable after chronopotentiometric testing at a high current density of 100 mA cm À 2 for 22 h, indicating potential for practical application. The enhanced OER performance is ascribed to the transition of Ni 2 + to Ni 3 + in NiCo-LDH induced by Mn doping, which activates the Ni sites. This work provides an approach to further optimize the OER performance of NiCo-LDH based catalysts.

A CoNi telluride heterostructure supported on Ni foam as an efficient electrocatalyst for the oxygen evolution reaction

“…14-0117) with a hydrotalcite-like structure. 24,31 Additionally, the diffraction peaks of this sample are slightly offset in the direction of lower angles after Co addition, which may be related to the larger ionic radius of Co ions, and the use of an appropriate amount of the Co additive will also reduce the crystallinity of the sample. The XRD result reveals the crystal structure and phase purity of the CoNi layered double hydroxide nanosheets in the 0.4CoNi LDH@Te-180C sample.…”

Ternary layered double hydroxide cathode materials for electrochemical energy storage: a review and perspective

“…Hollow materials can be prepared by a template method followed by an etching-precipitation method 31,110 or a direct hydrothermal method. 32,38 Yao prepared ZIF triangular nanosheets on carbon fiber cloth (ZIF-67/CC) by an aging reaction, and then used an etching–coprecipitation method to decompose the template ZIF-67 into triangular nanosheets, and by coprecipitation of Co, Ni and Fe ions, they were converted into CoNiFe-LDHs with a hollow structure. Compared with the preparation of hollow nanostructures by a template method and then an etching-coprecipitation method, the preparation process using a hydrothermal method is simpler.…”

“…Zhang et al prepared hollow NiCoMn-LDHs composed of 2D nanosheets by a solvothermal method. 38 In 2021, Hu prepared a new type of NiSiO@NiAlFe-LDH hollow sphere by a hydrothermal method. The adsorption mechanism of Cs by NiSiO@NiAlFe-LDH hollow spheres includes a complexation reaction and electrostatic attraction.…”

“…37 Zhang et al established a ternary metal system Ni 0.75 Fe 0.125 V 0.125 -LDHs/NF electrode, which showed good performance and improved intrinsic catalytic activity and active surface area. 38 Later, not just limited to NiFeM-LDHs, other types of ternary LDHs have been widely studied, such as CuNiCo-LDHs, 39 CoAlLa-LDHs, 40 and NiMgAl-LDHs. 41…”

“…37 Zhang et al established a ternary metal system Ni 0.75 Fe 0.125 V 0.125 -LDHs/NF electrode, which showed good performance and improved intrinsic catalytic activity and active surface area. 38 Later, not just limited to NiFeM-LDHs, other types of ternary LDHs have been widely studied, such as CuNiCo-LDHs, 39 CoAlLa-LDHs, 40 and NiMgAl-LDHs. 41 In addition, LDHs can also be changed into derivatives of LDHs through sulfuration, 37 nitridation, oxidation and other processes, 42 and can be combined with organic matter (EVA), 43 MXene nanosheets, 44,45 carbon materials (carbon bers, carbon nanotubes, carbon ball CSs, HCMSs, etc.…”