Engineering the axial coordination of cobalt single atom catalysts for efficient photocatalytic hydrogen evolution
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Licheng Bai1(
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Improving the catalytic activity of non-noble metal single atom catalysts (SACs) has attracted considerable attention in materials science. Although optimizing the local electronic structure of single atom can greatly improve their catalytic activity, it often involves in-plane modulation and requires high temperatures. Herein, we report a novel strategy to manipulate the local electronic structure of SACs via the modulation of axial Co–S bond anchored onto graphitic carbon nitride (C3N4) at room temperature (RT). Each Co atom is bonded to four N atoms and one S atom (Co-(N, S)/C3N4). Owing to the greater electronegativity of S in the Co–S bond, the local electronic structure of the Co atoms is available to be controlled at a relatively moderate level. Consequently, when employed for the photocatalytic hydrogen evolution reaction, the adsorption energy of intermediate hydrogen (H*) on the Co atoms is remarkably low. In the presence of the Co-(N, S)/C3N4 SACs, the hydrogen evolution rates reach up to 10 mmol/(g·h), which is nearly 10 and 2.5 times greater than the rates in the presence of previously reported transition metal/C3N4 and noble platinum nanoparticles (PtNPs)/C3N4 catalysts, respectively. Attributed to the tailorable axial Co–S bond in the SAC, the local electronic structure of the Co atoms can be further optimized for other photocatalytic reactions. This axial coordination engineering strategy is universal in catalyst designing and can be used for a variety of photocatalytic applications.
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Engineering the axial coordination of cobalt single atom catalysts for efficient photocatalytic hydrogen evolution
), Licheng Bai1(
)
Abstract
Improving the catalytic activity of non-noble metal single atom catalysts (SACs) has attracted considerable attention in materials science. Although optimizing the local electronic structure of single atom can greatly improve their catalytic activity, it often involves in-plane modulation and requires high temperatures. Herein, we report a novel strategy to manipulate the local electronic structure of SACs via the modulation of axial Co–S bond anchored onto graphitic carbon nitride (C3N4) at room temperature (RT). Each Co atom is bonded to four N atoms and one S atom (Co-(N, S)/C3N4). Owing to the greater electronegativity of S in the Co–S bond, the local electronic structure of the Co atoms is available to be controlled at a relatively moderate level. Consequently, when employed for the photocatalytic hydrogen evolution reaction, the adsorption energy of intermediate hydrogen (H*) on the Co atoms is remarkably low. In the presence of the Co-(N, S)/C3N4 SACs, the hydrogen evolution rates reach up to 10 mmol/(g·h), which is nearly 10 and 2.5 times greater than the rates in the presence of previously reported transition metal/C3N4 and noble platinum nanoparticles (PtNPs)/C3N4 catalysts, respectively. Attributed to the tailorable axial Co–S bond in the SAC, the local electronic structure of the Co atoms can be further optimized for other photocatalytic reactions. This axial coordination engineering strategy is universal in catalyst designing and can be used for a variety of photocatalytic applications.
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Acknowledgements
This work was financially supported by National Natural Science Foundation of China (No. 22008251), Guangdong Basic and Applied Basic Research Foundation (No. 2022A1515010318), and Shenzhen Science and Technology Program (No. JCYJ20220531095813031). The authors thank the Beijing Synchrotron Radiation Facility (beamline 1W1B) for the use of the instruments.
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