Interstitial boron-triggered electron-deficient Os aerogels for enhanced pH-universal hydrogen evolution

Yinghao Li, Chun-Kuo Peng, Huimin Hu, San-Yuan Chen, Jin-Ho Choi (), Yan-Gu Lin () and Jong-Min Lee ()
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Yinghao Li: Nanyang Technological University
Chun-Kuo Peng: National Yang Ming Chiao Tung University
Huimin Hu: Soochow University
San-Yuan Chen: National Yang Ming Chiao Tung University
Jin-Ho Choi: Soochow University
Yan-Gu Lin: National Synchrotron Radiation Research Center
Jong-Min Lee: Nanyang Technological University

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

Abstract: Abstract Developing high-performance electrocatalysts for hydrogen evolution reaction (HER) is crucial for sustainable hydrogen production, yet still challenging. Here, we report boron-modulated osmium (B-Os) aerogels with rich defects and ultra-fine diameter as a pH-universal HER electrocatalyst. The catalyst shows the small overpotentials of 12, 19, and 33 mV at a current density of 10 mA cm−2 in acidic, alkaline, and neutral electrolytes, respectively, as well as excellent stability, surpassing commercial Pt/C. Operando X-ray absorption spectroscopy shows that interventional interstitial B atoms can optimize the electron structure of B-Os aerogels and stabilize Os as active sites in an electron-deficient state under realistic working conditions, and simultaneously reveals the HER catalytic mechanisms of B-Os aerogels in pH-universal electrolytes. The density functional theory calculations also indicate introducing B atoms can tailor the electronic structure of Os, resulting in the reduced water dissociation energy and the improved adsorption/desorption behavior of hydrogen, which synergistically accelerate HER.

Date: 2022
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DOI: 10.1038/s41467-022-28805-8

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