Solid-phase hot-pressing of POMs-ZIFs precursor and derived phosphide for overall water splitting
Solid-phase hot-pressing of POMs-ZIFs precursor and derived phosphide for overall water splitting
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POMs-ZIFs 前体和衍生磷化物的固相热压用于整体水分解
DOI：
10.1016/j.apcatb.2019.01.007
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发表时间：
2019-05
期刊：
影响因子：
--
通讯作者：
Lan Ya-Qian
中科院分区：
文献类型：
--
作者：
Tang Yu-Jia;Zhu Hong-Jing;Dong Long-Zhang;Zhang A-Man;Li Shun-Li;Liu Jiang;Lan Ya-Qian
合理设计具有高性能的析氢、析氧电催化剂是近年来研究的热点。然而，大多数电催化剂是粉末，并且需要用粘合剂存款在导电基底上，导致步骤复杂并且阻碍长期稳定性的提高。采用固相热压法在碳布上快速温和地制备了聚氧乙烯基咪唑骨架（POMs-ZIF）前驱体。经磷化处理后，在CC表面制备了氮掺杂石墨碳层（CoP/MoP@NC/CC）。CoP/MoP@NC/CC由于CoP、MoP和所形成的氧化物/氢氧化物层的协同作用而具有优异的水裂解电催化性能。在碱性介质中，电流密度为10 mA cm− 2时，其HER和OER的过电位分别为94 mV和270 mV，上级大多数已报道的磷化物基电催化剂。值得注意的是，1000 mA cm− 2的超高电流密度可以在HER仅为475 mV和OER仅为657 mV的过电位下实现。作为整体水裂解的阴极和阳极，CoP/MoP@NC可以在1.71 V的电池电压下实现50 mA cm− 2的电流密度。固相热压法保证了快速成核和稳定材料在基底上的紧密均匀生长，适用于更多的电化学反应。
Rational design of electrocatalyst with high performance for both hydrogen and oxygen evolution reaction is attracting considerable attention in recent years. However, most electrocatalysts are powders and require to deposit on conductive substrates with binders, leading to complicated steps and hindering the improvement of long-term stability. This work exhibits a solid-phase hot-pressing method to prepare polyoxometalates based zeolitic imidazolate frameworks (POMs-ZIFs) precursor on carbon cloth (CC) rapidly and mildly. After phosphidation treatment, nitrogen-doped graphitic carbon layers coated phosphide on CC (CoP/MoP@NC/CC) is synthesized. CoP/MoP@NC/CC has excellent electrocatalytic performance for water splitting due to the synergistic effect of CoP, MoP and as-formed oxide/hydroxide layers. It shows the low overpotentials of 94 mV for HER and 270 mV for OER at the current density of 10 mA cm−2in alkaline medium, which is superior to most of the reported phosphide-based electrocatalysts. Notably, the ultra-high current density of 1000 mA cm−2can be reached at the overpotentials of only 475 mV for HER and 657 mV for OER. As both cathode and anode for overall water splitting, CoP/MoP@NC can achieve the current density of 50 mA cm−2at the cell voltage of 1.71 V. The solid-phase hot-pressing method ensures the tight and uniform growth of the fast nucleating and stable materials on substrate and applies for more electrochemical reactions.
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