首页|Improvement in hydrogen storage performance of MgH2 by vanadium doped with ZIF-8 derived a single-atom catalyst V-N-C
Improvement in hydrogen storage performance of MgH2 by vanadium doped with ZIF-8 derived a single-atom catalyst V-N-C
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Herein,the successful preparation of a single-atom catalyst V-N-C using vanadium-doped zeolitic imi-dazolate framework(ZIF)-8 as a precursor is reported.The experimental results showed that the V-N-C had a good promoting effect on the hydrogen storage performance of MgH2,and the optimal addition amount of V-N-C was 10 wt％.The hydrogenation and dehydrogenation apparent activation energies of 10 wt％V-N-C-catalyzed MgH2 were reduced by 44.9 and 53.5 kJ·mol-1,respectively,compared to those of additive-free MgH2.The 10 wt％V-N-C-catalyzed MgH2 could reabsorb 5.92 wt％of hydro-gen in 50 min at 150 ℃,with a capacity retention rate of 99.1％after 30 cycles of hydrogen absorption and des-orption.Mechanism analysis showed that V-N-C was partially transformed into VN and metallic V when it was milled with MgH2;the in-situ-formed VN and metallic V played an important role in improving the hydrogen storage performance of MgH2.This approach provides a potential solution for obtaining high-performance Mg-based hydro-gen storage materials through synergistic interactions between V,N and C.
Guangxi Novel Battery Materials Research Center of Engineering Technology and Center on Nanoenergy Research,Guangxi Colleges and Universities Key Laboratory of Blue Energy and Systems Integration,Carbon Peak and Neutrality Science and Technology Development Institute,School of Physical Science and Technology,Guangxi University,Nanning 530004,China
Nanning Engineering Technology Research Center for Power Transmission System of New Energy Vehicle,Transportation College,Nanning University,Nanning 530200,China
国家自然科学基金国家自然科学基金Nanning Excellent Young Talents Cultivation Project of Scientific and Technological Innovation and Entrepreneurship
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