In situ growth of a POMOF-derived nitride based composite on Cu foam to produce hydrogen with enhanced water dissociation kinetics
Tang, YJ (Tang, Yu-Jia)[ 1,2 ] ; Wang, Y (Wang, Yu)[ 3 ] ; Zhu, HJ (Zhu, Hong-Jing)[ 1 ] ; Zhou, K (Zhou, Kun)[ 2,3 ]*; Lan, YQ (Lan, Ya-Qian)[ 1 ] *（兰亚乾）

[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Collaborat Innovat Ctr Biomed Funct Mat, Jiangsu Key Lab New Power Batteries, Nanjing 210023, Jiangsu, Peoples R China
[ 2 ] Nanyang Technol Univ, Sch Mech & Aerosp Engn, 50 Nanyang Ave, Singapore 639798, Singapore
[ 3 ] Nanyang Technol Univ, Nanyang Environm & Water Res Inst, Environm Proc Modelling Ctr, 1 CleanTech Loop, Singapore 637141, Singapore

JOURNAL OF MATERIALS CHEMISTRY A，201907,7(22),13559-13566

Dispersing active materials on a working electrode without any binder is always desirable for electrocatalytic processes. Here we report a promising method to grow polyoxometalate-based MOFs (POMOFs) in situ on a copper foam (CF) substrate. Impressively, CF can serve as metal nodes for the direct growth of MOFs on its 3D skeleton tightly. After ammoniating the POMOFs/CF precursor, a nitride-based composite (MoN-Cu-NPC/CF) is achieved with such a unique structure with MoN and Cu nanoparticles embedded in N, P-doped amorphous carbon and decorated on CF uniformly. We find that MoN-Cu-NPC/CF has an improved HER activity over a wide pH range. Especially in an alkaline electrolyte, this composite shows a small onset overpotential of 60 mV, a Tafel slope of 152 mV dec(-1) and an outstanding long-term stability (over 20 h), outperforming most of the nitride-based HER electrocatalysts to date. Density functional theory (DFT) calculations reveal that the synergy between MoN and Cu can modify the electronic structure of the active Cu sites, which significantly improves H* binding and water dissociation kinetics. This work provides a facile strategy for in situ growth of MOFs on a metal substrate without any binder and holds substantial promise for efficient HER applications.

文章链接：
https://pubs.rsc.org/en/content/articlelanding/2019/TA/C9TA02200G#!divAbstract

版权与免责声明：本网页的内容由收集互联网上公开发布的信息整理获得。目的在于传递信息及分享，并不意味着赞同其观点或证实其真实性，也不构成其他建议。仅提供交流平台，不为其版权负责。如涉及侵权，请联系我们及时修改或删除。邮箱：sales@allpeptide.com