Journal
ACS CATALYSIS
Volume 12, Issue 15, Pages 9437-9445Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.2c01944
Keywords
ruthenium dioxide catalyst; oxygen evolution reaction; oxygen vacancy; electronic structure modulating; proton exchange membrane water electrolysis
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Funding
- National Key Research and Development Program of China [2021YFB4000200]
- National Natural Science Foundation of China (NSFC) [22002088, 62174122, 22172098]
- Shanghai Sailing Program [20YF1420500]
- Science and Technology Commission of Shanghai Municipality [19DZ2271100, 20DZ1205400]
- Oceanic Interdisciplinary Program of Shanghai Jiao Tong University [SL2020MS007]
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This study presents an electronic structure modulating strategy by dispersing RuO2 over defective TiO2 enriched with oxygen vacancies (RuO2/D-TiO2), which significantly enhances the acidic oxygen evolution reaction (OER) kinetics. The as-prepared RuO2/D-TiO2 catalyst exhibits good catalytic activity, low voltage, and long-term stability.
RuO2 is the most efficient material reported so far for acidic oxygen evolution reaction (OER), yet suffering from insufficient stability in practical water-splitting operations. Targeting on this issue, herein we report an electronic structure modulating strategy by dispersing RuO2 over defective TiO2 enriched with oxygen vacancies (RuO2/D-TiO2). Synergetic (spectro-)electrochemistry and theoretical simulations reveal a continuous band structure at the interface between RuO2 and defective TiO2, as well as a lowered energetic barrier for *OOH formation, which are accountable for the largely enhanced acidic OER kinetics. As a result, the as-prepared RuO2/D-TiO2 catalyst exhibits a low overpotential of 180 mV at 10 mA cm(-2), a low cell voltage of 1.84 V at 2 A cm(-2), and a long lifetime above 100 h at 200 mA cm(-2), providing hints for a more robust acidic OER catalyst design.
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