Enhanced hydrogen generation by reverse spillover effects over bicomponent catalysts

Zhe Gao (), Guofu Wang, Tingyu Lei, Zhengxing Lv, Mi Xiong, Liancheng Wang, Shuangfeng Xing, Jingyuan Ma, Zheng Jiang and Yong Qin ()
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Zhe Gao: Chinese Academy of Sciences
Guofu Wang: Chinese Academy of Sciences
Tingyu Lei: Chinese Academy of Sciences
Zhengxing Lv: Chinese Academy of Sciences
Mi Xiong: Chinese Academy of Sciences
Liancheng Wang: Chinese Academy of Sciences
Shuangfeng Xing: Chinese Academy of Sciences
Jingyuan Ma: Chinese Academy of Sciences
Zheng Jiang: Chinese Academy of Sciences
Yong Qin: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract The contribution of the reverse spillover effect to hydrogen generation reactions is still controversial. Herein, the promotion functions for reverse spillover in the ammonia borane hydrolysis reaction are proven by constructing a spatially separated NiO/Al2O3/Pt bicomponent catalyst via atomic layer deposition and performing in situ quick X-ray absorption near-edge structure (XANES) characterization. For the NiO/Al2O3/Pt catalyst, NiO and Pt nanoparticles are attached to the outer and inner surfaces of Al2O3 nanotubes, respectively. In situ XANES results reveal that for ammonia borane hydrolysis, the H species generated at NiO sites spill across the support to the Pt sites reversely. The reverse spillover effects account for enhanced H2 generation rates for NiO/Al2O3/Pt. For the CoOx/Al2O3/Pt and NiO/TiO2/Pt catalysts, reverse spillover effects are also confirmed. We believe that an in-depth understanding of the reverse effects will be helpful to clarify the catalytic mechanisms and provide a guide for designing highly efficient catalysts for hydrogen generation reactions.

Date: 2022
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DOI: 10.1038/s41467-021-27785-5

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