过电位
电催化剂
分解水
析氧
材料科学
煅烧
化学工程
无定形固体
电化学
纳米笼
电解水
纳米技术
电解
催化作用
化学
电极
物理化学
结晶学
有机化学
工程类
电解质
光催化
作者
Jiayang Zhao,Yao Zhang,Haoran Guo,Haotian Zhang,Junkai Ren,Rui Song
出处
期刊:Small
[Wiley]
日期:2022-05-13
卷期号:18 (24)
被引量:14
标识
DOI:10.1002/smll.202200832
摘要
Rational regulation of the composition and structure of electrocatalysts is crucial to the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Herein, a new electrocatalyst of nickel phosphate microprism (VSB/NiPO) is developed via a simple solvothermal reaction. The microprism is mainly composed of Versailles-Santa Barbara-5 (VSB-5, molecular sieve) with unique nanochannels, which contribute to accelerating mass transfer and exposing more active sites, thus displaying excellent HER activity. Subsequently, the crystallinity and electronic structure of the framework are modulated by incorporating Fe with the combination of calcination and impregnation. The nanochannels are converted to the amorphous arrangement, and the Ni centers are regulated to the higher valence. The resultant Fe-VSB/NiPO-500 exhibits a low OER overpotential of 227 mV at 50 mA cm-2 . Interestingly, an integrated electrolyzer assembled by VSB/NiPO(-) and Fe-VSB/NiPO-500(+) performs well for overall water splitting, which requires only 1.487 V to achieve 10 mA cm-2 , and remains stable at 100 mA cm-2 over 100 h. This finding opens a new avenue for developing VSB-5 in the field of electrocatalysis.
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