Journal
SMALL
Volume 18, Issue 15, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202106874
Keywords
electronic states; hydrogen diffusion barriers; palladium; ternary hollow shells; ultrafast H; (2) sensors
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Funding
- National Natural Science Foundation of China [22175031, 22072163, 21761132010, 91645114]
- Natural Science Foundation of Liaoning Province of China [2020-YQ-02]
- Fundamental Research Funds for the Central Universities [N2105010]
- Open Project of State Key Laboratory of Supramolecular Structure and Materials [sklssm2021035]
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This study presents a method for designing ultrafast H-2 sensors using PdO decorated PdAu ternary hollow shells. The material exhibits high gas accessibility and surface area, and the decoration of Au and PdO reduces the energy barrier for hydrogen diffusion, resulting in an ultrafast response time of approximately 0.9 seconds.
Designing ultrafast H-2 sensors is of particular importance for practical applications of hydrogen energy but still quite challenging. Herein, PdO decorated PdAu ternary hollow shells (PdO-PdAu HSs) exhibiting an ultrafast response of approximate to 0.9 s to 1% H-2 in air at room temperature are presented. PdO-PdAu HSs are fabricated by calcinating PdAu bimetallic HSs in air to form PdO-Au binary HSs, which are then partially reduced by NaBH4 solution, forming PdO-PdAu HSs. This ternary hybrid material takes advantage of multiple aspects to synergistically accelerate the sensing speed. The HS morphology promises high gas accessibility and high surface area for H-2 adsorption, and decoration of Au and PdO alters the electronic state of Pd and reduces the energy barrier for hydrogen diffusing from the surface site of Pd into the subsurface site. The content of Au and PdO in the ternary HSs can be simply tuned, which offers the possibility to optimize their promotion effects to reach the best performance. The proposed fabrication strategy sheds light on the rational design of ultrafast Pd-based H-2 sensors by controlling the sensor structure and engineering the electronic state of active species.
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