Delicate Control on the Shell Structure of Hollow Spheres Enables Tunable Mass Transport in Water Splitting

Abstract

In the study of structure–property relationships for rational materials design, hollow multishell structures (HoMSs) have attracted tremendous attention owing to the optimal balance between mass transfer and surface exposure. Considering the shell structure can significantly affect the properties of HoMSs, in this paper, we provide a novel one‐step strategy to continually regulate the shell structures of HoMSs. Through a simple phosphorization process, we can effectively modify the shell from solid to bubble‐like and even duplicate the shells with a narrow spacing. Benefitting from the structure merits, the fabricated CoP HoMSs with close duplicated shells can promote gas release owing to the unbalanced Laplace pressure, while accelerating liquid transfer for enhanced capillary force. It can provide effective channels for water and gas and thus exhibits a superior electrocatalytic performance in the hydrogen and oxygen evolution reaction.

Dynamics and control of active sites in hierarchically nanostructured cobalt phosphide/chalcogenide-based electrocatalysts for water splitting

“…1l and p) is in principle due to the inevitable oxidation of P upon exposure to air. 22,[65][66][67][68][69][70] These results in their entirety support that the as-synthesized yolkshell ZIF-67@CoFe-PB NC precursors are converted after phosphorization into hierarchical architectures of Co@CoFe-P NBs.…”

Safeguarding the RuO2 phase against lattice oxygen oxidation during acidic water electrooxidation

“…Proton-exchange membrane (PEM) electrolyzers with high power density hold great promise for the economical production of hydrogen. 1,2 The successful placement of PEM electrolyzers as the future energy technology requires the development of highly robust, active, and cost-effective electrocatalysts for the oxygen evolution reaction (OER), 3,4 which is sluggish due to the four-electron transfer process. 5 Ru oxides have received considerable interest as OER catalysts due to their very high initial activity toward the OER.…”

Constructed Interfacial Oxygen‐Bridge Chemical Bonding in Core‐Shell Transition Metal Phosphides/Carbon Hybrid Boosting Oxygen Evolution Reaction

“…[1][2][3][4][5][6][7][8] Cobaltbased phosphides are emerging as a new class of water oxidation catalysts with reports of high activity. [9][10][11][12][13][14][15][16][17] Nevertheless, the catalytic stability of those catalyst is less than desirable under extreme measurement conditions, and their catalytic activity is limited due to their poor intrinsic activity and low active site exposure. [11,18,20] To overcome these issues and further enhance the electrochemical activity, carbon-based materials such as graphene oxide (GO), carbon nanotubes (CNTs), and carbon fibers (carbon cloth) have been found as suitable candidates to improve the activity coupled with cobaltbased phosphides.…”