Coupling of nanocrystal hexagonal array and two-dimensional metastable substrate boosts H2-production

Zhenglong Fan, Fan Liao, Yujin Ji, Yang Liu (), Hui Huang, Dan Wang, Kui Yin, Haiwei Yang, Mengjie Ma, Wenxiang Zhu, Meng Wang, Zhenhui Kang (), Youyong Li, Mingwang Shao (), Zhiwei Hu () and Qi Shao ()
Additional contact information
Zhenglong Fan: Soochow University
Fan Liao: Soochow University
Yujin Ji: Soochow University
Yang Liu: Soochow University
Hui Huang: Soochow University
Dan Wang: Soochow University
Kui Yin: Soochow University
Haiwei Yang: Soochow University
Mengjie Ma: Soochow University
Wenxiang Zhu: Soochow University
Meng Wang: Soochow University
Zhenhui Kang: Soochow University
Youyong Li: Soochow University
Mingwang Shao: Soochow University
Zhiwei Hu: Max Planck Institute for Chemical Physics of Solids
Qi Shao: Soochow University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract Designing well-ordered nanocrystal arrays with subnanometre distances can provide promising materials for future nanoscale applications. However, the fabrication of aligned arrays with controllable accuracy in the subnanometre range with conventional lithography, template or self-assembly strategies faces many challenges. Here, we report a two-dimensional layered metastable oxide, trigonal phase rhodium oxide (space group, P-3m1 (164)), which provides a platform from which to construct well-ordered face-centred cubic rhodium nanocrystal arrays in a hexagonal pattern with an intersurface distance of only 0.5 nm. The coupling of the well-ordered rhodium array and metastable substrate in this catalyst triggers and improves hydrogen spillover, enhancing the acidic hydrogen evolution for H2 production, which is essential for various clean energy-related devices. The catalyst achieves a low overpotential of only 9.8 mV at a current density of −10 mA cm−2, a low Tafel slope of 24.0 mV dec−1, and high stability under a high potential (vs. RHE) of −0.4 V (current density of ~750 mA cm−2). This work highlights the important role of metastable materials in the design of advanced materials to achieve high-performance catalysis.

Date: 2022
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DOI: 10.1038/s41467-022-33512-5

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