High‐Alkaline Water‐Splitting Activity of Mesoporous 3D Heterostructures: An Amorphous‐Shell@Crystalline‐Core Nano‐Assembly of Co‐Ni‐Phosphate Ultrathin‐Nanosheets and V‐ Doped Cobalt‐Nitride Nanowires (Adv. Sci. 23/2022)

Abstract

Water‐Splitting In article number 2201311 , Seunghyun Lee and co‐workers demonstrate excellent water‐splitting activity of 3D mesoporous heterostructures assembled from CoNiPO x ‐nanosheets amorphous‐shells and V‐doped Co 4 N nanowires crystalline‐cores on Ni foam substrate. The synergistic effect between the crystalline‐core and amorphous‐shell results remarkable oxygen and hydrogen evolution reaction at low overpotentials.

Rapid Electronic Transport Channel of Co‐P with Mo in a Heterostructure Embedded with P, N Dual Doped Porous Carbon for Electrocatalytic Oxygen and Hydrogen Evolution

“…[61] Amorphous-crystalline core-shell heterostructures consisting of CoNiPO x grown over a conductive 3D Ni foam substrate resemble our P,Mo,OÀ Co/PNC/NF electrode as 3D-porous and binder-free electrodes. [19] Such optimization mixed metal phosphate offers remarkable overall water-splitting with extremely low HER and OER overpotentials. Apart from low overpotential, faster charge transfer rate and high stability in FeCoPO 4 depend on the higher electronegativity of Co by altered d-electron density of metal ion.…”

“…[18] Nano assembly of CoÀ Ni-phosphate act as electrode surface modifier which results in amorphous shell@crystalline-core mesoporous 3D heterostructures (CoNiPO x @V-Co 4 N/NF) as biofunctional OER electrode. [19] In situ, the growth of CoÀ P on rGO to form a binder-free electrode in the form of nanosheets wrapped around the surface of Ti fiber felt was explored for successful seawater splitting for salinity-tolerant H 2 evolution. [20] Phosphate IrMo clusters exhibit a P-optimized electronic structure of Ir and a synergistic feature for decomposing water while offering ultralow overpotential and high mass activity for the alkaline HER.…”

Research Advances in Amorphous‐Crystalline Heterostructures Toward Efficient Electrochemical Applications

“…Typically, a fundamental building block is firstly prepared by the selected method and employed as substrate at next step for the other component growth via the same or different method. [ 104–106 ] Crucially, one of the methods in multistep strategy should be especially designed to achieve the amorphous component, such as the hydrothermal/solvothermal reaction, [ 107–109 ] electrodeposition method, [ 110–111 ] chemical etching method [ 112–114 ] and partial sulfuration [ 115 ] or boronization, [ 116–117 ] methods, etc.…”

“…prepared a 3D mesoporous amorphous‐shell@crystalline‐core CoNiPO x @V‐Co 4 N/NF heterostructure by the multistep strategy through the hydrothermal‐nitridation‐electrodeposition process. [ 111 ] The electrodeposition approach has been particularly selected to fabricate the amorphous CoNiPO x component. It is demonstrated that the microstructure and crystal growth behavior of the nanomaterials can be finely regulated by changing the electrodeposition parameters, such as the applied current/voltage, molar ratios of precursor and deposition temperature, etc., giving the beneficial condition for the formation of amorphous‐crystalline heterostructures.…”

“…[ 142–144 ] Among various kinds of nanomaterials, the amorphous‐crystalline heterostructures are favorably studied in recent years as advanced OER electrocatalysts for performance improvement. [ 74–75,105,110–111,118,145–146 ] Xu et al. designed the novel ultrathin Ni‐ZIF/Ni‐B nanosheets amorphous‐crystalline heterostructure and demonstrated decreased overpotential of 234 mV for OER.…”