Retracted: Colloidal Cobalt Phosphide Nanocrystals as Trifunctional Electrocatalysts for Overall Water Splitting Powered by a Zinc–Air Battery

Abstract

Highly efficient and stable electrocatalysts, particularly those that are capable of multifunctionality in the same electrolyte, are in high demand for the hydrogen evolution reaction (HER), oxygen evolution reaction (OER), and oxygen reduction reaction (ORR). In this work, highly monodisperse CoP and Co P nanocrystals (NCs) are synthesized using a robust solution-phase method. The highly exposed (211) crystal plane and abundant surface phosphide atoms make the CoP NCs efficient catalysts toward ORR and HER, while metal-rich Co P NCs show higher OER performance owing to easier formation of plentiful Co P@COOH heterojunctions. Density functional theory calculation results indicate that the desorption of OH* from cobalt sites is the rate-limiting step for both CoP and Co P in ORR and that the high content of phosphide can lower the reaction barrier. A water electrolyzer constructed with a CoP NC cathode and a Co P NC anode can achieve a current density of 10 mA cm at 1.56 V, comparable even to the noble metal-based Pt/C and RuO /C pair. Furthermore, the CoP NCs are employed as an air cathode in a primary zinc-air battery, exhibiting a high power density of 62 mW cm and good stability.

CuCo2S4 Nanosheets@N‐Doped Carbon Nanofibers by Sulfurization at Room Temperature as Bifunctional Electrocatalysts in Flexible Quasi‐Solid‐State Zn–Air Batteries

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ZABs) have acquired enormous attention because of their high theoretical energy density (1370 W h kg −1 ), abundant lowcost resources for the starting materials required, and high device safety. [9][10][11][12][13][14][15][16][17][18] For this purpose, several types of cathode materials have been explored. [9][10][11][12][13][14][15][16][17][18] For this purpose, several types of cathode materials have been explored.

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Retracted: Phosphorus‐Rich Colloidal Cobalt Diphosphide (CoP2) Nanocrystals for Electrochemical and Photoelectrochemical Hydrogen Evolution

“…The transmission electron microscopy (TEM) image of the as‐synthesized CoP 2 NCs (Figure b) shows a highly uniform spherical morphology with the average size of 18 ± 2 nm, which is similar to the Co 2 P and CoP NCs (Figure S8, Supporting Information). Additional characterization of the Co 2 P and CoP NCs can be found in our previous work . High‐resolution TEM (HRTEM) was used to confirm the structure and gain insight into what surface facets may be exposed (Figure c) .…”

Carbon‐Enriched Cobalt Phosphide with Assorted Nanostructure as a Multifunctional Electrode for Energy Conversion and Storage Devices

“…As a result of the enriched multifunctional electrocatalytic and energy storage capability of the prepared Co 2 P electrode, a lab‐scale water electrolyser was designed as shown in Scheme ,. The lab‐scale water electrolyser was assembled by a two‐electrode set up encompassing bifunctional Co 2 P/C electrode as both anode and cathode.…”

“…Moreover, cobalt phosphide as an electrode appears to be more robust related to sulphide electrode due to its resilient durability in high alkaline electrolytes, whereas the sulphide based electrode has a tendency to decompose profoundly dropping its initial capacity. Hence, cobalt phosphides with its energetic reaction kinetics and robust strength are promptly reported as a favourable electrochemical and electrocatalysts material owing to its exceptional physicochemical properties, distinct metalloid characteristics, and astounding electrical conductivity . In view of that, budding researchers are in high altitude to develop fine‐tuned CoP based electrode materials by effective methods anticipated for various energy storage and conversion systems.…”

“…Recently, Li et al. synthesised highly monodisperse CoP and Co 2 P nanocrystals (NCs) for water electrolyzer and achieved a current density of 10 mA cm −2 at 1.56 V . Similarly, Li et al.…”