Carbon Nanotubes Interconnected NiCo Layered Double Hydroxide Rhombic Dodecahedral Nanocages for Efficient Oxygen Evolution Reaction

Abstract

Proper control of a 3d transition metal-based catalyst with advanced structures toward oxygen evolution reaction (OER) with a more feasible synthesis strategy is of great significance for sustainable energy-related devices. Herein, carbon nanotube interconnected NiCo layered double hydroxide rhombic dodecahedral nanocages (NiCo-LDH RDC@CNTs) were developed here with the assistance of a feasible zeolitic imidazolate framework (ZIF) self-sacrificing template strategy as a highly efficient OER electrocatalyst. Profited by the well-fined rhombic dodecahedral nanocage architecture, CNTs’ interconnected characteristic and structural feature of the vertically aligned nanosheets, the as-synthesized NiCo-LDH RDC@CNTs integrated large exposed active surface areas, enhanced electron transfer capacity and multidimensional mass diffusion channels, and thereby collaboratively afforded the remarkable electrocatalytic performance of the OER. Specifically, the designed NiCo-LDH RDC@CNTs exhibited a distinguished OER activity, which only required a low overpotential of 255 mV to reach a current density of 10 mA cm−2 for the OER. For the stability, no obvious current attenuation was detected, even after continuous operation for more than 27 h. We certainly believe that the current extraordinary OER activity combined with the robust stability of NiCo-LDH RDC@CNTs enables it to be a great candidate electrocatalyst for economical and sustainable energy-related devices.

The Scalable Solid-State Synthesis of a Ni5P4/Ni2P–FeNi Alloy Encapsulated into a Hierarchical Porous Carbon Framework for Efficient Oxygen Evolution Reactions

“…For Ni 2p ( Figure 7 c), the initial peaks at 855.6 and 872.9 eV correspond to Ni 2+ 2p 3/2 and Ni 2+ 2p 1/2 , respectively [ 39 ], and the peaks located at 856.9 and 874.2 eV are ascribed to Ni 3+ 2p 3/2 and Ni 3+ 2p 1/2 , respectively, which originate from oxidized and phosphatized nickel, respectively. The two satellite peaks (marked by Sat.)…”

Partial carbonization and etching of ZIF-9 to construct SO42−-decorated C@NiCoFe LDH ultrathin nanosheets for efficient oxygen evolution reaction

“…Nonetheless, single-phase hydroxides still face the obstacles of weak conductivity and serious aggregation, and hybridizing hydroxides with carbon materials may result in the synergistic effect to effectively tackle these issues. [20][21][22][23] Designing effective carbon/hydroxide composites with multi-components through chemical treatments, including pyrolysis, hydrothermal treating or chemical etching, was achieved; nevertheless, complicated synthesis processes are oen required. [24][25][26] Therefore, a proper and facile protocol based on multiple strategies to construct the above integrated nanoarchitecture, which make species function synergistically and pursue a balance via multiple regulations to achieve efficient catalysis for alkaline OER, is highly desirable but systematically challenging.…”

Research Progress of Bifunctional Oxygen Reactive Electrocatalysts for Zinc–Air Batteries

“…Hence, as one of the most efficient energy devices, ZABs have the advantages of safety, environmental protection and high energy densities, with the potential to find applications in many fields [ 9 , 10 ]. The setbacks associated with lithium–air batteries, such as poor cycle stability and poor wet environment stability, can be effectively solved with ZABs, which means that ZABs have the potential to become the next generation of energy storage equipment [ 11 ]. The working principle of the rechargeable zinc–air battery is a new type of chemical power supply composed of a metal anode and air cathode, in which the 4e process of oxygen reduction (ORR) and oxygen evolution (OER) reactions are, respectively, the discharging and charging reactions of the ZAB air cathode Again, OER is a semi-reaction of decomposed water, while ORR is a semi-reaction of fuel battery.…”