Corresponding Author

Jia-Jun Wang(jiajunhit@hit.edu.cn)


Phase engineering is considered as an effective method for modulating the electronic structure and catalytic activity of catalysts. The disordered conformation of amorphous materials allows flexible reforming of the surface electronic structure, showing their attractiveness as catalysts for hydrogen evolution reaction (HER). Herein, we designed and developed an amorphous ruthenium dioxide (a-RuO2) catalyst with a disordered Ru-O configuration. The conformational relationship between Ru-O ordering and HER performance is established by combining advanced electron microscopic techniques with detailed electrochemical tests. Specifically, the disordered Ru-O coordination significantly enhanced the HER catalytic activity in both acidic and alkaline media, ultimately leading to HER performance of a-RuO2 approaching that of commercial Pt/C with higher economics. In addition, a-RuO2 exhibited excellent stability after 10 h current-time (i-t) testing at 10 mA·cm-2. Further theoretical simulations showed that the lowered d-band center and optimized electron transport of a-RuO2 modulated the adsorption strength of the active site to the intermediate reactants, promoting HER kinetics. This work provides a new perspective for exploring highly active HER catalysts through phase engineering.

Graphical Abstract


phase engineering, hydrogen evolution reaction, amorphous catalyst, electronic structure

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