Qin, Jun-Sheng Du, Dong-Ying Guan, Wei Bo, Xiang-Jie Li, Ya-Fei Guo, Li-Ping Su, Zhong-Min Wang, Yuan-Yuan Lan, Ya-Qian Zhou, Hong-Cai Ultrastable Polymolybdate-Based Metal–Organic Frameworks as Highly Active Electrocatalysts for Hydrogen Generation from Water Two novel polyoxometalate (POM)-based metal–organic frameworks (MOFs), [TBA]<sub>3</sub>[ε-PMo<sup>V</sup><sub>8</sub>Mo<sup>VI</sup><sub>4</sub>O<sub>36</sub>(OH)<sub>4</sub>Zn<sub>4</sub>]­[BTB]<sub>4/3</sub>·<i>x</i>Guest (<b>NENU-500</b>, BTB = benzene tribenzoate, TBA<sup>+</sup> = tetrabutylammonium ion) and [TBA]<sub>3</sub>[ε-PMo<sup>V</sup><sub>8</sub>Mo<sup>VI</sup><sub>4</sub>O<sub>37</sub>(OH)<sub>3</sub>Zn<sub>4</sub>]­[BPT] (<b>NENU-501</b>, BPT = [1,1′-biphenyl]-3,4′,5-tricarboxylate), were isolated. In these compounds, the POM fragments serving as nodes were directly connected with organic ligands giving rise to three-dimensional (3D) open frameworks. The two anionic frameworks were balanced by TBA<sup>+</sup> ions residing inside the open channels. They exhibit not only good stability in air but also tolerance to acidic and basic media. Furthermore, they were employed as electrocatalysts for the hydrogen evolution reaction (HER) owing to the combination of the redox activity of a POM unit and the porosity of a MOF. Meanwhile, the HER activities of <b>ε­(trim)</b><sub><b>4/3</b></sub>, <b>NENU-5</b>, and <b>HKUST-1</b> were also studied for comparison. Remarkably, as a 3D hydrogen-evolving cathode operating in acidic electrolytes, <b>NENU-500</b> exhibits the highest activity among all MOF materials. It shows an onset overpotential of 180 mV and a Tafel slope of 96 mV·dec<sup>–1</sup>, and the catalytic current density can approach 10 mA·cm<sup>–2</sup> at an overpotential of 237 mV. Moreover, <b>NENU-500</b> and <b>NENU-501</b> maintain their electrocatalytic activities after 2000 cycles. HER activities;acidic electrolytes;electrocatalytic activities;Tafel slope;237 mV;framework;POM fragments;hydrogen evolution reaction;Active Electrocatalysts;2000 cycles;BTB;TBA;POM unit;HKUST;MOF materials;redox activity;Hydrogen Generation;benzene tribenzoate;WaterTwo novel polyoxometalate;tetrabutylammonium ion;180 mV;BPT;NENU;onset overpotential 2015-06-10
    https://acs.figshare.com/articles/journal_contribution/Ultrastable_Polymolybdate_Based_Metal_Organic_Frameworks_as_Highly_Active_Electrocatalysts_for_Hydrogen_Generation_from_Water/2159287
10.1021/jacs.5b02688.s001