Nan Li,Minghao Shi,Wei Zhan,Wenjing Shen,Mianmian Wu,Guifang Sun,Qingfei Li,Jiangquan Ma
Ru-based catalysts are potential substitutes for Pt in the hydrogen evolution reaction (HER). It is worth noting that the Se ions in RuSe2 can modulate the electronic structure of the Ru metal, thus effectively improving the HER kinetics of RuSe2. However, single electronic structure modulation is hard to complete due to the electron deficiency of active Ru atoms. Herein, we prepare and design a novel RuSe2/Co–N–C (RuSe2 nanospheres supported on Co–N–C nanosheets) electrocatalyst with two-electron modulation by a hydrothermal and thermal annealing method. Benefiting from the uniform distribution of RuSe2 nanospheres on Co–N–C nanosheets and Co–N–C nanosheets acting as additional electron donors to make up for the electron deficiency of the Ru metal, RuSe2/Co–N–C exhibits excellent HER performance with a low overpotential of 26.4 mV at 10 mA cm−2 and a low Tafel slope of 53.2 mV dec−1. This work offers an effective method for the synthesis of high catalytic performance electrocatalysts by constructing an interaction between the carrier and the active metal.
Addressing the inherent activity-stability trade-off and industrial application bottlenecks of ruthenium-based oxygen evolution reaction (OER) catalysts, this study proposes a novel microwave-field-induced strategy coupling in-situ foaming and selenization of a metal–organic framework (ZIF-67). This approach successfully synthesizes a composite catalyst comprising cobalt-doped ruthenium selenide supported on nitrogen-doped porous carbon (Co-RuSe 2 /N-C). Leveraging the synergistic effect of microwave dielectric heating and the pyrolysis-induced foaming of Ru-ZIF-67, the strategy achieves the in-situ construction of a three-dimensional porous carbon skeleton and the precise anchoring of highly dispersed RuSe 2 nanocrystals. Combined experimental characterization and theoretical calculations reveal the strong electronic synergy between cobalt dopant sites and the pyrite phase of RuSe 2 modulates interfacial electron rearrangement, optimizes the adsorption free energy of reaction intermediates, and significantly enhances catalytic reaction kinetics. The resulting catalyst exhibits breakthrough performance: its OER mass activity surpasses that of commercial IrO 2 by 26.2 times and maintains well performance with overpotential increases of merely 22.4 mV after 3000 cycles, which provides a new paradigm for developing efficient, stable, and low-cost practical electrocatalysts.
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