Amorphous CoO  coupled carbon dots as a spongy porous bifunctional catalyst for efficient photocatalytic water oxidation and CO2 reduction

Sun, Wanjun; Meng, Xiangyu; Xu, Chunjiang; Yang, Jilin; Liang, Xiangming; Dong, Yu; Dong, Congzhao; Ding, Yong

doi:10.1016/s1872-2067(20)63646-4

Cited by 80 publications

(33 citation statements)

References 66 publications

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“…As we all know, fossil energy is a non-renewable resource, which has certain adverse effects on our living environment. [1][2][3] Adhering to the path of sustainable development is today's main development concept, so solar energy and hydrogen energy are environmentally friendly energy sources that meet future development needs. [4][5][6] Since the life of the sun is much longer than that of the earth, solar energy is an inexhaustible energy source for us, so the photocatalytic technology to convert it into hydrogen energy has huge potential in the future.…”

Section: Introductionmentioning

confidence: 99%

NiAl‐LDH In‐Situ Derived Ni₂P and ZnCdS Nanoparticles Ingeniously Constructed S‐Scheme Heterojunction for Photocatalytic Hydrogen Evolution

Zhang

et al. 2022

ChemCatChem

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Surface modification of photocatalytic materials is a good choice for improving semiconductor activity. Simple surface modification strategy and abundant active site construction are the key factors to improve photocatalytic activity. Take NiAl-LDH as the matrix, perform partial phosphating, and use the spatial confinement effect to generate highly dispersed Ni 2 P. Ni 2 P does not exist independently but on the 3D NiAl-LDH's surface. The introduction of NiAl-LDH-P can improve the utilization of Zn 0.5 Cd 0.5 S on solar energy and speed up the transfer rate of photogenerated carriers. Ni 2 P makes the active sites of phosphide more abundant, and the unique electron distribution of phosphide is conducive to photon capture, thus accelerating the hydrogen precipitation rate in the composite photocatalyst. Partial phosphating retains the 3D framework of hydrotalcite. The well-dispersed 0D to 3D S-scheme heterojunction hybrid material is composed of three-dimensional nano-flowers and tiny nano-particles alternately formed by countless nano-sheets. The multi-dimensional structured composite photocatalyst has abundant active sites, large specific surface area, and strong proton adsorption capacity, thus exhibiting more excellent photocatalytic hydrogen evolution performance. The maximum hydrogen production of the composite photocatalyst under 5 W LED simulated visible light for 5 h can reach 1982.43 μmol (39.64 mmol g À 1 h À 1 ) and the apparent quantum efficiency reached 6.22 % at 475 nm. The construction of the Zn 0.5 Cd 0.5 S/NiAl-LDH-P S-scheme heterojunction changes the hydrogen evolution site from Zn 0.5 Cd 0.5 S to Ni 2 P, so that the conduction band position of the composite photocatalyst becomes higher, the reduction ability is enhanced, and the hydrogen evolution The site changed from Zn 0.5 Cd 0.5 S to Ni 2 P, which is more conducive to the generation of hydrogen, thereby improving the activity and stability of hydrogen production. The space design of 0D and 3D provides new thinking for the design of the closely contacted S-scheme heterojunction photocatalytic. The application of surface modification strategies and the construction of abundant active sites point out the direction for further improving the composite photocatalytic activity.

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Section: Introductionmentioning

confidence: 99%

NiAl‐LDH In‐Situ Derived Ni₂P and ZnCdS Nanoparticles Ingeniously Constructed S‐Scheme Heterojunction for Photocatalytic Hydrogen Evolution

Zhang

et al. 2022

ChemCatChem

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“…Both heterogeneous [34][35][36][37][38][39] and homogeneous catalysts [40][41][42][43][44] for driving water oxidation coupled with CO 2 reduction have been investigated. Nevertheless, in contrast with heterogeneous catalyst, homogeneous catalysts shows many merits such as easily adjusting the molecular and electronic configuration and profoundly clarifying the catalytic mechanism.…”

Section: Introductionmentioning

confidence: 99%

Bioinspired cobalt molecular electrocatalyst for water oxidation coupled with carbon dioxide reduction

Yin

Zhang

Wang

et al. 2021

Applied Organom Chemis

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To mimic photosynthesis in green plants, it is a crucial challenge to drive water oxidation and CO 2 reduction in one single system. In this study, we present a bioinspired trinuclear pyridinedicarboxylate cobalt complex (Et 3 NH) 2 [Co III 2 Co II (OH 2 )(pda) 5 ]ÁH 2 O (1) that is capable of homogeneously electrocatalytic water oxidation and CO 2 reduction simultaneously. The designed mix-valent cobalt complex is in a V-configuration composed of two terminal Co III ions and one central Co II ion coordinated with one water ligand, which is resemble to aqua ligation of the natural catalytic complex in oxygenevolving complex (OEC). The electrochemical results show that this trinuclear cobalt complex could electrocatalyze water oxidation under neutral condition at the potentials of 1.15 V and 2.00 V versus NHE, with the Faraday efficiency as high as about 96% and 82%, and the TOF of 2.22 and 10.20 s À1 , respectively. Meanwhile, it also displays electrocatalytic activity for the reduction of CO 2 to CO with the TOF of 0.93 s À1 . The cobalt complex has good catalytic performance for the conversion of H 2 O and CO 2 into O 2 and CO, respectively, which may be mainly due to the key role of the flexible water ligand on the central Co II ion in the catalytic process. This work represents the first multinuclear cobalt complex for mimicking bio-system to drive water oxidation coupled with carbon dioxide reduction simultaneously.

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“…As shown in Figure a, EY exhibited the strongest fluorescence intensity after being excited with the light source, while the composite catalyst LDH-1@Cu 2 S exhibits the lowest fluorescence intensity and has a low binding rate with the hole when the electron falls back. Therefore, the photogenerated carriers are effectively separated, which is conducive to the improvement of hydrogen production efficiency. , Figure b shows the time-resolved photoluminescence spectra of EY, LDH-2, and LDH-2@Cu 2 S . The average lifetime of the fluorescence process of the three catalysts can be calculated by eq ⟨τ⟩ is the average lifetime, τ i is the decay time, and B i is the corresponding weight factors.…”

Section: Results and Discussionmentioning

confidence: 99%

Snowflake-like Cu₂S Coated with NiAl-LDH Forms a p–n Heterojunction for Efficient Photocatalytic Hydrogen Evolution

Jin

Wang

et al. 2021

ACS Appl. Energy Mater.

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A NiAl-LDH(LDH-2) catalyst was prepared using hexamethylenetetramine as the template. The photocatalytic mechanism of the p−n heterojunction was established by coupling it with snowflake Cu 2 S to form a binary NiAl-LDH@Cu 2 S(LDH-2@Cu 2 S) composite layer reaction substrate. The composite catalyst (LDH-2@Cu 2 S) maintained the original snowflake structure of Cu 2 S; this unique branching structure made the light wave refract multiple times, enhancing the absorption opportunity of visible light; snowflake Cu 2 S was evenly coated with a layer of NiAl-LDH fragments, forming a dense contact interface and facilitating the transmission and separation of photocarriers. The comparison experiment and BET test showed that the enhanced photocatalytic activity of the LDH-2@Cu 2 S composite catalyst was closely related to its larger specific surface area. In addition, the construction of the p−n heterojunction also promoted the improvement of hydrogen production efficiency. The results of hydrogen production experiments showed that the hydrogen production activity of the composite catalyst LDH-2@Cu 2 S was 245 μmol in 5 h, which was 50 times that of unmodified NiAl-LDH(LDH-1). This work adopts a simple method to improve the performance of NiAl-LDH, so that it can play a greater application role in the field of photocatalytic hydrogen production.

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Amorphous CoO coupled carbon dots as a spongy porous bifunctional catalyst for efficient photocatalytic water oxidation and CO2 reduction

Cited by 80 publications

References 66 publications

NiAl‐LDH In‐Situ Derived Ni₂P and ZnCdS Nanoparticles Ingeniously Constructed S‐Scheme Heterojunction for Photocatalytic Hydrogen Evolution

NiAl‐LDH In‐Situ Derived Ni₂P and ZnCdS Nanoparticles Ingeniously Constructed S‐Scheme Heterojunction for Photocatalytic Hydrogen Evolution

Bioinspired cobalt molecular electrocatalyst for water oxidation coupled with carbon dioxide reduction

Snowflake-like Cu₂S Coated with NiAl-LDH Forms a p–n Heterojunction for Efficient Photocatalytic Hydrogen Evolution

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Amorphous CoO coupled carbon dots as a spongy porous bifunctional catalyst for efficient photocatalytic water oxidation and CO2 reduction

Cited by 80 publications

References 66 publications

NiAl‐LDH In‐Situ Derived Ni2P and ZnCdS Nanoparticles Ingeniously Constructed S‐Scheme Heterojunction for Photocatalytic Hydrogen Evolution

NiAl‐LDH In‐Situ Derived Ni2P and ZnCdS Nanoparticles Ingeniously Constructed S‐Scheme Heterojunction for Photocatalytic Hydrogen Evolution

Bioinspired cobalt molecular electrocatalyst for water oxidation coupled with carbon dioxide reduction

Snowflake-like Cu2S Coated with NiAl-LDH Forms a p–n Heterojunction for Efficient Photocatalytic Hydrogen Evolution

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NiAl‐LDH In‐Situ Derived Ni₂P and ZnCdS Nanoparticles Ingeniously Constructed S‐Scheme Heterojunction for Photocatalytic Hydrogen Evolution

NiAl‐LDH In‐Situ Derived Ni₂P and ZnCdS Nanoparticles Ingeniously Constructed S‐Scheme Heterojunction for Photocatalytic Hydrogen Evolution

Snowflake-like Cu₂S Coated with NiAl-LDH Forms a p–n Heterojunction for Efficient Photocatalytic Hydrogen Evolution