Improvement in hydrogen storage performance of MgH_(2) by vanadium doped with ZIF-8 derived a single-atom catalyst V-N-C  

作　　者：Fei-Fan Hong Wei-Tao Shi Ruo-Lin Zhao Yi Fan Zi-Qi Liu Si-Zhi Ding Hai-Zhen Liu Wen-Zheng Zhou Jin Guo Zhi-Qiang Lan 

机构地区：[1]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 [2]Nanning Engineering Technology Research Center for Power Transmission System of New Energy Vehicle,Transportation College,Nanning University,Nanning 530200,China

出　　处：《Rare Metals》2024年第6期2623-2635,共13页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.52261038 and 51861002);Nanning Excellent Young Talents Cultivation Project of Scientific and Technological Innovation and Entrepreneurship(No.RC20220102)。

摘　　要：Herein,the successful preparation of a singleatom catalyst V-N-C using vanadium-doped zeolitic imidazolate 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 MgH_(2),and the optimal addition amount of V-N-C was 10wt%.The hydrogenation and dehydrogenation apparent activation energies of 10 wt%V-N-C-catalyzed MgH_(2)were reduced by 44.9 and 53.5 kJ·mol^(-1),respectively,compared to those of additive-free MgH_(2).The 10 wt%V-N-C-catalyzed MgH_(2)could reabsorb 5.92 wt%of hydrogen in 50 min at 150℃,with a capacity retention rate of 99.1%after 30 cycles of hydrogen absorption and desorption.Mechanism analysis showed that V-N-C was partially transformed into VN and metallic V when it was milled with MgH_(2);the in-situ-formed VN and metallic V played an important role in improving the hydrogen storage performance of MgH_(2).This approach provides a potential solution for obtaining high-performance Mg-based hydrogen storage materials through synergistic interactions between V,N and C.

关 键 词：MgH_(2) Hydrogen storage materials CATALYST Hydrogen storage perormance 

分 类 号：TG139.7[一般工业技术—材料科学与工程] TQ426[金属学及工艺—合金]