Defect engineering of NiCo-layered double hydroxide hollow nanocages for highly selective photoreduction of CO₂ to CH₄ with suppressing H₂ evolution

Abstract

We found that abundant defects could be created in the HC-NiCo-LDH by constructing a hollow nanocage morphology. The HC-NiCo-LDH showed excellent CO2 photoreduction performance that increasing the CH4 selectivity while suppressing the H2 evolution.

Ni–Co Bimetallic Hydroxide Nanosheet Arrays Anchored on Graphene for Adsorption‐Induced Enhanced Photocatalytic CO2 Reduction

“…In addition, the addition of alkaline Co cations further increases the CO 2 adsorption capacity of the material and suppresses the generation of H 2 by-products. [43,46] This further confirms the effectiveness of the Ni 7 Co 3 -GR material in photocatalytic CO 2 reduction.…”

“…In addition, active H* coupling inevitably occurs to form a small amount of H 2 molecules. [43][44][45] Using the Ni 7 Co 3 -GR catalyst leads to superior CO photocatalytic yield and high selectivity during the catalytic process because electron-rich Co facilitates the generation of a large number of electrons, separation of carrier, and adsorption of visible light. In addition, the addition of alkaline Co cations further increases the CO 2 adsorption capacity of the material and suppresses the generation of H 2 by-products.…”

CdS nanocages@defective-CoNi-LDH with bilayer porous hollow frameworks toward optimized sono-photocatalytic performance

“…The spectral g values for Ni 2+ ions are usually in the range 2.2–2.3, as shown in previous reports. 30 Fig. 3f shows that HD-CoNi-LDH produced a strong signal at g = 2.21, close to the g value of the superexchange coupled pair Ni( ii )–O–Ni( ii ) ( g = 2.25); 31 this indicated that many defects were present, mainly in the Ni site, and there were more Ni( ii )–O–Ni( ii ) defects in Ni( ii )-HD-CoNi-LDH than in Ni( ii )-bulk-CoNi-LDH.…”

Layered double hydroxide-based nanomaterials for biomedical applications

“…Meanwhile, the high-concentration alkaline solution used in the synthesis process requires a large amount of water for washing, resulting in excessive waste of water resources. 80,81 In view of this, Song et al successfully designed a green atom-economic method for various LDHs preparation, such as MgAl-LDHs and MgFeAl-LDHs, etc. 82 Taking MgAl-LDHs as an example, an aqueous solution containing Mg(OH) 2 and Al(OH) 3 was added with carbonic acid solution under vigorous stirring, and the resulting mixture was aged at 80 1C for 2 days to obtain the pure product without washing.…”