Simple 2 D/0 D CoP Integration in a Metal–Organic Framework‐Derived Bifunctional Electrocatalyst for Efficient Overall Water Splitting

Abstract

Non‐noble metal‐based bifunctional electrocatalysts are highly desired for water electrolysis. However, constructing a water electrolyzer using a sole catalyst without compromising either its oxygen evolution reaction (OER) or hydrogen evolution reaction (HER) performance is still challenging. In this study, a simple strategy is developed to integrate 2 D and 0 D CoP in the same metal–organic framework precursor‐derived hollow N‐doped carbon nanotube‐assembled polyhedron (HNCNP). The unique hierarchical structure endows the resulting nanocomposite with both the advantages of more exposed active sites for 2 D and large surface‐to‐volume ratio for 0 D materials, whereas the hollow interior could benefit the charge and mass transfer properties. Thus, CoP/HNCNP@2 D CoP exhibits outstanding OER and HER activity and a low cell voltage when employed as both the anode and cathode in a two‐electrode water electrolyzer. The approach of integrating the same metal phosphide phase with diverse dimensions may inspire new ways to design hierarchical nanostructures for advanced energy conversion applications.

Through‐Space Electrostatic Effects of Positively Charged Substituents on the Hydrogen Evolution Reaction

“…Platinum is highly active for electrocatalytic HER, but its large‐scale use is limited because this noble metal has low natural abundance and is expensive [19,20] . Therefore, developing cheap and highly active HER electrocatalysts is at the heart of new energy conversion schemes [21–25] …”

“…[19,20] Therefore, developing cheap and highly active HER electrocatalysts is at the heart of new energy conversion schemes. [21][22][23][24][25] To realize the rational design of HER electrocatalysts, elucidating the effects of various structural components on HER is of fundamental and practical significance. Molecular complexes have the benefits for studying structure-function relationships.…”

Bifunctional Catalyst Derived from Sulfur-Doped VMoOx Nanolayer Shelled Co Nanosheets for Efficient Water Splitting

“…A relatively similar behavior of the devices toward overall water splitting was also verified by CV measurement, as shown in Figure S29a. Interestingly, the performance of 2D Co@S-VMoO x NSs-based device surpassed various advanced devices derived from other transition metal-based catalysts such as CoP/HNCNP@2D CoP, Bi 3 (FeO 4 )­(MoO 4 ) 2 , Co 0.2 -VOOH, and so on ,− (Figure g).…”

Recent Progress in the Development of Advanced Functionalized Electrodes for Oxygen Evolution Reaction: An Overview

“…The bi-functional natured CoP/HNCNP@CoP electrode matrix has been well established under certain conditions. The porous structured matrix has been analyzed by the N 2 adsorption/desorption technique, and the estimated surface area value (156.04 m 2 g − 1 ) has been confirmed by the BET method and it could provide benefits for the energy conversion process [ 27 ]. The Ru-doped α-MnO 2 -based benchmark electrocatalysts were shown to be an excellent catalyst for OER, with a larger BET surface area (87.4 m 2 g − 1 ).…”