Modulating Prussian Blue Analogues-derived Binary Metal Oxides for Efficient Oxygen Evolution Catalysts
首发时间:2020-05-25
Abstract:Oxygen evolution reaction (OER) is closely related to numerous energy-related applications so that developing high-activity, durable and cost-effective electrocatalysts for OER has been an inevitable trend. Prussian blue analogues (PBAs), a kind of metal organic frameworks (MOFs), which have been paid more attention in the filed of electrocatalysis because of unique framework structure and adjustable components. Herein, we synthesis a series of Ni-Co PBAs via modulating metal ratio by a coprecipitation method and then anneal the as-prepared Ni-Co PBAs, which used as OER catalysts. We found that as the increasing of nickel content, the size of catalysts decreases, which resulting in an increasing of specific surface area and electrochemical active sites, thereby improving the performance of OER. Furthermore, benefiting from the minimum size with largest specific area, largest electrochemical active surface area with different and abundant active sites, the Ni-Co-31 oxides shows a small overpotential of 340 mV at a current density of 10 mAocm-2, a small Tafel slope of 89 mVodec-1, which is superior to other catalysts prepared. This work proves the great significance of PBAs derivatives with different metal ratios for OER performance, which is meaningful for the preparation and mass production of efficient electrocatalysts.
keywords: Metal organic frameworks Prussian blue analogues binary metal oxides Oxygen evolution reaction
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普鲁士蓝类似物衍生的二元金属氧化物的调控及其作为析氧反应催化剂的研究
摘要:氧气析出反应(OER)与许多与能源相关的应用密切相关,因此开发高活性,耐用且经济高效的OER电催化剂已成为必然趋势。普鲁士蓝类似物(PBA)是一种金属有机骨架(MOF),由于其独特的骨架结构和可调控的组分,在电催化领域受到了越来越多的关注。本文中,我们通过共沉淀法通过调节金属比合成一系列的Ni-Co PBA,然后对Ni-Co PBA进行高温煅烧用于OER催化。我们发现,随着镍含量的增加,催化剂的尺寸减小,这导致比表面积和电化学活性位点的增加,从而提高了OER的性能。此外,得益于最小尺寸、最大比表面积、最大电化学活性表面积及不同种类且数量丰富的活性位点,Ni-Co-31氧化物在10 mAocm-2的电流密度下显示出较小过电位(340 mV),塔菲尔斜率较小(89 mVodec-1),优于所制备的其他催化剂。这项工作证明了不同金属比的PBAs衍生物对OER性能的重要意义,这对于制备和批量生产高效电催化剂具有重要意义。
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普鲁士蓝类似物衍生的二元金属氧化物的调控及其作为析氧反应催化剂的研究
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