首页|Accelerating H* desorption of hollow Mo2C nanoreactor via in-situ grown carbon dots for electrocatalytic hydrogen evolution

Accelerating H* desorption of hollow Mo2C nanoreactor via in-situ grown carbon dots for electrocatalytic hydrogen evolution

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Molybdenum carbide(Mo2C)is a promising non-noble metal electrocatalyst with electronic structures similar to Pt for hydrogen evolution reaction(HER).However,strong H* adsorption at the Mo sites hin-ders the improvement of HER performance.Here,we synthesized monodisperse hollow Mo2C nanoreac-tors,in which the carbon dots(CD)were in situ formed onto the surface of Mo2C through carburization reactions.According to finite element simulation and analysis,the CD@Mo2C possesses better mesoscale diffusion properties than Mo2C alone.The optimized CD@Mo2C nanoreactor demonstrates superior HER performance in alkaline electrolyte with a low overpotential of 57 mV at 10 mA cm-2,which is better than most Mo2C-based electrocatalysts.Moreover,CD@Mo2C exhibits excellent electrochemical stability during 240 h,confirmed by operando Raman and X-ray diffraction(XRD).Density functional theory(DFT)calculations show that carbon dots cause the d-band center of CD@Mo2C to shift away from Fermi level,promoting water dissociation and the desorption of H*.This study provides a reasonable strategy towards high-activity Mo-based HER eletrocatalysts by modulating the strength of Mo-H bonds.

Mo2C nanoreactorCarbon dotsH* desorptionElectrocatalytic hydrogen evolution

Mengmeng Liu、Yuanyuan Jiang、Zhuwei Cao、Lulu Liu、Hong Chen、Sheng Ye

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School of Materials and Chemistry,Anhui Agricultural University,Hefei 230036,Anhui,China

National Natural Science Foundation of ChinaStarting Fund for Scientific Research of High-Level Talents,Anhui Agricultural UniversityAnhui Provincial Key Research and Development PlanInnovation and Entrepreneurship Training Program for College StudentsInnovation and Entrepreneurship Training Program for College StudentsInnovation and Entrepreneurship Training Program for College Students

22372001rc3821082022e07020037X202310364204S202210364046X202310364209

2024

10.1016/j.jechem.2024.04.045

能源化学
中国科学院大连化学物理研究所 中国科学院成都有机化学研究所

能源化学

CSTPCDEI
影响因子：0.654
ISSN：2095-4956
年,卷(期)：2024.96(9)