Amorphous Ni(OH)2 encounter with crystalline CuS in hollow spheres: A mesoporous nano-shelled heterostructure for hydrogen evolution electrocatalysis

Nickel Foam Supported Co3O4@Ni3Se4 Core‐Shell Nanorod Arrays with Long‐Term and Efficient Catalytic Performance for Water Splitting

“…89‐2020), which is consistent with the previous literature . Consequently, the element of Co 3 O 4 @Ni 3 Se 4 is analysed by EDS and elemental mapping indicates the uniform distribution of elements (Co, O, Ni, Se), which is consistent with the result of XRD (Figure S1) . As in Figure S2, the Raman peak at 298 cm −1 proves the Ni−Se bond in the Co 3 O 4 @Ni 3 Se 4 .…”

Synthesis of CuS@CoS2 Double‐Shelled Nanoboxes with Enhanced Sodium Storage Properties

“…FESEM (Figure c) and TEM (Figure g and Figure S4) images reveal that the morphology of the as‐formed product exhibits small variation compared to the core–shell Cu 2 O@Co(OH) 2 nanocubes. However, the EDX result of the as‐derived product (Figure S5) reveals the presence of S element, which should come from CuS formed through the reaction between surficial oxidized CuO and S 2− ions . The selective sulfidation of copper oxide cores in the Cu 2 O@Co(OH) 2 nanocubes is because of the ultralow solubility product constant ( K sp ) of CuS, leading to remarkably high binding force between Cu 2+ and S 2− ions in solution.…”

“…[27] Asubsequent sulfidation process is conducted by the mild treatment of core-shell Cu 2 O@Co(OH) 2 nanocubes with an appropriate amount of Na 2 Sa tr oom temperature.F ESEM (Figure 2c)a nd TEM (Figure 2g and Figure S4) images reveal that the morphology of the as-formed product exhibits small variation compared to the core-shell Cu 2 O@Co(OH) 2 nanocubes.H owever,t he EDX result of the as-derived product ( Figure S5) reveals the presence of Selement, which should come from CuS formed through the reaction between surficial oxidized CuO and S 2À ions. [28,29] The selective sulfidation of copper oxide cores in the Cu 2 O@Co-(OH) 2 nanocubes is because of the ultralow solubility product constant (K sp )o fC uS,l eading to remarkably high binding force between Cu 2+ and S 2À ions in solution. Theas-prepared Cu 2 O@CuS@Co(OH) 2 nanocubes are then transformed into CuS@Co(OH) 2 nanoboxes by selectively etching Cu 2 Oo ut.…”

Boosting H2 Generation Coupled with Selective Oxidation of Methanol into Value‐Added Chemical over Cobalt Hydroxide@Hydroxysulfide Nanosheets Electrocatalysts

“…Hydrogen, as a promising clean and renewable energy source with high calorific value and no emission of harmful substances in the process of using, is receiving a considerable attention than ever before. Electrocatalytic water splitting for hydrogen production powered by sustainable electricity has been regarded as an economical and environment‐friendly approach . In general, the overall water electrolysis consists of two half reactions—hydrogen evolution reaction (HER) at the cathode and oxygen evolution reaction (OER) at the anode.…”