Journal
TRANSACTIONS OF TIANJIN UNIVERSITY
Volume 27, Issue 2, Pages 139-146Publisher
SPRINGERNATURE
DOI: 10.1007/s12209-020-00279-z
Keywords
Single-atom; Pd; g-C3N4; Active sites; Hydrogen; Photocatalytic
Funding
- National Natural Science Foundation of China [21976116, 21473248]
- Guangdong Science and Technology Program [2018A050506025]
- Guangzhou Science and Technology Program [202002030406, 201804010181]
- High Level Talents Introduction Project of Pearl River Talent Plan in Guangdong Province [2019CX01L308]
- Support Scheme of Guangzhou for Leading Talents in Innovation and Entrepreneurship Funding [2016015]
- Key Deployment Projects of Chinese Academy of Sciences [ZDRW_CN_2020_1]
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The introduction of single-atom Pd significantly improves the separation and transportation of charge carriers, leading to a longer lifespan for consequent reactions. This work provides new insights into the design of single-atom catalyst.
Photocatalytic hydrogen evolution is an attractive field for future environment-friendly energy. However, fast recombination of photogenerated charges severely inhibits hydrogen efficiency. Single-atom cocatalysts such as Pt have emerged as an effective method to enhance the photocatalytic activity by introduction of active sites and boosting charge separation with low-coordination environment. Herein, we demonstrated a new strategy to develop a highly active Pd single atom in carbon-deficient g-C3N4 with a unique coordination. The single-atom Pd-N-3 sites constructed by oil bath heating and photoreduction process were confirmed by HADDF-STEM and XPS measurements. Introduction of single-atom Pd greatly improved the separation and transportation of charge carriers, leading to a longer lifespan for consequent reactions. The obtained single-atom Pd loaded on the carbon-deficient g-C3N4 showed excellent photocatalytic activity in hydrogen production with about 24 and 4 times higher activity than that of g-C3N4 and nano-sized Pd on the same support, respectively. This work provides a new insight on the design of single-atom catalyst.
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