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CoO-Mo 2 N hollow heterostructure for high-efficiency electrocatalytic hydrogen evolution reaction
NPG Asia Materials ( IF 9.7 ) Pub Date : 2019-12-13 , DOI: 10.1038/s41427-019-0177-z
Danni Su , Xiaomeng Zhang , Aiping Wu , Haijing Yan , Ziyi Liu , Lei Wang , Chungui Tian , Honggang Fu

Driving the electrocatalytic hydrogen evolution reaction (HER) with solar-energy cells is considered a green and sustainable way to produce H2. Herein, CoO-Mo2N hollow heterojunctions were designed for effective HER based on the combined virtues of the hollow structure and heterojunctions. The hollow CoMoO4-Co(OH)2 precursor was first synthesized via the reaction of Co2+ from ZIF-67 with MoO42− and OH in a Na2MoO4 solution. A series of experiments indicate the formation of the hollow Co-Mo-O precursor followed a mechanism analogous to the nanoscale “Kirkendall Effect”. After heating in NH3, the CoO-Mo2N hollow heterostructure was obtained. The Mo species in the precursor played an important role in maintaining the morphology under nitridation treatment. The hollow structure is favorable for contact and diffusion of electrolyte with (in) catalysts, while the CoO in CoO-Mo2N is favorable for the dissociation of water. Both promote the HER. Under optimized conditions, the hollow catalyst exhibited good HER performance with an overpotential of 65 mV at 10 mA cm−2 in 1 M KOH. The performance is better than that of many nonprecious metal-based catalysts. An electrolyzer composed of CoO-Mo2N heterojunctions as the cathode and NiFe-LDH as the anode can be driven by a solar cell to achieve effective overall water splitting. The adjudication of MOFs makes the route promising for the design of robust catalysts for advanced application.



中文翻译:

CoO-Mo 2 N空心异质结构用于高效电催化制氢反应

用太阳能电池驱动电催化氢释放反应(HER)被认为是生产H 2的绿色且可持续的方式。在此,结合空心结构和异质结的优点,设计了CoO-Mo 2 N空心异质结用于有效的HER。中空的CoMoO 4 -Co(OH)2的前体首先通过Co的反应合成2+从ZIF-67的MoO 4 2-和OH -中中的Na 2的MoO 4溶液。一系列实验表明,空心Co-Mo-O前体的形成遵循类似于纳米级“柯肯德尔效应”的机理。在NH中加热后如图3所示,获得了CoO-Mo 2 N中空异质结构。前驱体中的Mo物种在氮化处理下对维持形态具有重要作用。中空结构有利于电解质与催化剂的接触和扩散,而CoO-Mo 2 N中的CoO有利于水的离解。两者都促进HER。在优化条件下,中空催化剂表现出良好的HER性能,在1 M KOH中的10 mA cm -2下的过电势为65 mV 。该性能优于许多非贵金属基催化剂。由CoO-Mo 2组成的电解槽N异质结作为阴极,NiFe-LDH作为阳极可以由太阳能电池驱动,以实现有效的总水分解。MOF的裁决使该路线有望用于先进应用的坚固催化剂的设计。

更新日期:2019-12-13
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