Interfacial Engineering‐Triggered Bifunctionality of CoS₂/MoS₂ Nanocubes/Nanosheet Arrays for High‐Efficiency Overall Water Splitting

Abstract

Searching for high‐efficiency nonprecious bifunctional electrocatalysts for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) is paramount for the advancement of water electrolysis technologies and the associated renewable energy devices. Modulation of electronic structure of an electrocatalyst via heterointerface engineering represents an efficient strategy to improve its electrocatalytic performance. Herein, a feasible hydrothermal synthesis of a novel heterostructured catalyst was demonstrated, comprising CoS2 nanocubes and vertically aligned MoS2 nanosheet arrays directly grown on flexible and conductive carbon cloth (CC) substrate (denoted as CoS2/MoS2@CC). Thanks to the elaborate interface engineering and vertically aligned nanosheet arrayed architecture, the resultant self‐supported CoS2/MoS2@CC electrode possessed enriched exposed active sites, modulated electronic configuration, multidimensional mass transport channels, and outstanding mechanical strength, thereby affording exceptional electrocatalytic performances towards the HER and OER in alkaline electrolyte with overpotentials of 71 and 274 mV at 10 mA cm−2, respectively. In addition, a two‐electrode electrolyzer assembled by CoS2/MoS2@CC required a cell voltage of 1.59 V at 10 mA cm−2 with nearly 100 % faradaic efficiency and remarkable durability, showing great potential for scalable and economical water electrolysis.

Boosting Electrocatalytic Oxygen Evolution over Ce−Co9S8 Core–Shell Nanoneedle Arrays by Electronic and Architectural Dual Engineering

“…The survey scan XPS spectrum (Figure 3a) shows the co‐existence of Ce, Co and S signals in Ce−Co 9 S 8 @CC. For the high‐resolution Co 2p spectrum (Figure 3b), two narrow peaks centered at 778.6 and 793.7 eV can be clearly observed, corresponding to metallic Co 2p 3/2 and Co 2p 1/2 which is a typical feature for cobalt sulfides [20] . Other peaks can be well deconvoluted to oxidized Co species (Co 3+/2+ ) and relevant shakeup satellites.…”

Fe incorporation-induced electronic modification of Co-tannic acid complex nanoflowers for high-performance water oxidation

“…These interconnected nanosheets could dramatically enlarge the specific surface area, expose more active sites and provide highways for mass transfer. 52,53 As displayed in Fig. S3,† the SEM images indicate that the Fe 0.1 Co 0.9 -TA, Fe 0.26 Co 0.74 -TA and Co-TA samples also possess the flower-like morphology, while the Fe-TA exhibits an irregular monolith-like structure, implying that the Co precursor may play a crucial role in determining the formation of Fe x Co 1− x -TA nanoflowers.…”

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

“…Architecturally, the morphological engineering of LDHs (shape and size, porosity, etc.) can efficiently provide more accessible catalytically active sites, tapping luxuriant mass diffusion channels and robust structural and electrocatalytic stability, which will undoubtedly expedite the OER kinetics [ 30 ]. Furthermore, the construction of a specific structure such as a hollow nanocage structure can also provide independent reaction chamber/cells, and thus produce more low coordination atoms, promote the mass transfer process, and accelerate reaction rates toward the OER [ 31 ].…”