ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Prussian blue analogues as heterogeneous catalysts for hydrogen generation from hydrolysis of sodium borohydride: a comparative study

Duong Dinh Tuan, Eilhann Kwon, Jia-Yin Lin, Xiaoguang Duan, Yi-Feng Lin, and Kun-Yi Andrew Lin

Department of Environmental Engineering, Innovation and Development Center of Sustainable Agriculture, Research Center of Sustainable Energy and Nanotechnology, National Chung Hsing University, Taichung, Taiwan

E-mail: yflin@cycu.edu.tw

Received: 11 March 2020  Accepted: 17 August 2020

Abstract:

As a special class of coordinated frameworks comprised of various metal species, Prussian blue analogues (PBAs) have received increasing attention for catalytic applications. Nevertheless, few studies have been performed to investigate catalytic activities of PBAs for hydrogen generation (HG) from NaBH₄ hydrolysis. No researches have been implemented to examine effects of different M^II and M^III of PBAs (M^II₃[M^III(CN)₆]₂) (M^II = Co, Fe, Mn, Ni, and Zn; M^III = Fe, Co) on NaBH₄ hydrolysis for HG. Thus, the aim of the study is to explore and compare catalytic activities of various PBAs for HG from NaBH₄ hydrolysis. While two hexacyano-metalates and different metals are used to obtain various PBAs, Co₃[Co(CN₆)]₂ (Co–Co) is the most effective PBA for HG from NaBH₄ hydrolysis. Furthermore, Co–Co has a much lower E_a of 37.6 kJ/mol for HG from NaBH₄ hydrolysis in comparison to E_a values by other reported catalysts. Besides, HG by Co–Co could be optimized in the presence of 5% NaOH concentration, which leads to an even lower E_a of 28.6 kJ/mol. Co–Co is also reusable and stable for multiple cycles of HG. These features reveal that Co-containing PBAs can be a promising heterogeneous catalyst to facilitate HG from NaBH₄ hydrolysis.

Keywords: Prussian blue analogues; Mofs; H2; Sodium borohydride; Catalytic hydrolysis

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-020-01326-8

Chemical Papers 75 (2) 779–788 (2021)