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首页> 外文期刊>Catalysis science & technology >Surface reconstruction of Ni doped Co-Fe Prussian blue analogues for enhanced oxygen evolution
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Surface reconstruction of Ni doped Co-Fe Prussian blue analogues for enhanced oxygen evolution

机译：镍掺杂Co-Fe普鲁士的表面重建蓝色的类似物增强氧进化

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摘要

An efficient oxygen evolution reaction (OER) process requires fast kinetics to increase water splitting efficiency. Prussian blue analogues (PBAs) as a promising OER electrocatalyst have attracted more attention due to their surface reconstruction to form active oxyhydroxides layer during the continuous OER process. However, the research on how to optimize the surface reconstruction of PBAs is still lacking. Herein, Ni-doped Co-Fe PBAs nanocubes were designed as an efficient OER catalyst to promote surface-selective etch and reconstruction into metal oxyhydroxides during the activation process. Structural characterization and analysis indicated that the incorporation of Ni enhanced the surface reconstruction, and the resulted metal oxyhydroxides acted as the major active sites for OER electrocatalysis. The rate-determining step is converted to the final O-2 release step after the activation process, which significantly accelerates OER kinetics. As a result, the NiCo-Fe PBAs electrode exhibits excellent catalytic activity with a low overpotential of 274 mV under a current density of 100 mA cm(-2) and Tafel slope of 36 mV dec(-1).
机译：一个高效的氧进化反应(OER)增加水的过程需要快速动力学分割效率。作为一个有前途的OER electrocatalyst (pba)由于其表面吸引了更多的关注重建形成活跃的氢氧化物层在进行过程中。研究如何优化重建pba仍然缺乏。Ni-doped Co-Fe pba nanocubes被设计成一个有效促进OER催化剂surface-selective腐蚀和重建金属氢氧化物在激活的过程。表明,Ni公司的增强表面重建,和结果金属氢氧化物作为主要的活动网站在电催化作用。速率决定步骤转化为决赛0 2发布步骤激活过程后,大大加快OER动力学。因此,NiCo-Fe pba电极展品优秀的催化活性较低274 mV电流密度下的过电压马100厘米(2)和塔菲尔的斜率36 mV12月(1)。

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