摘要
对高效催化剂进行多尺度调控可优化中间体的吸附能量(原子层面),并实现快速传质(三维宏观层面),这对于提升整体水分解性能至关重要.在本工作中,我们首先在镍铁氢氧化物中引入氧空位,然后通过磷化反应将其转化为具有纳米阵列形态的NiFe-Vo-P催化剂.在析氧反应催化过程中,NiFe-Vo-P表面会原位形成磷酸盐阴离子及具有催化活性的Ni(Fe)OOH,能显著优化反应中间体的吸附强度.结果表明,NiFeVo-P在过电位为289 mV时电流密度可达1.5 A cm^(-2).同时,其超亲水/超疏气纳米阵列形貌可有效促进传质,在25和70℃的条件下,可在~2.0V的电池电压下分别获得580 mA cm^(-2)和1.0 A cm^(-2)的电流密度,是未进行超疏气形貌工程催化剂的电流密度的2倍以上.
Multiscale engineering of efficient catalysts to optimize the adsorption energy of intermediates(atomic level)and achieve rapid mass transfer(three-dimensional(3D)bulk level)is crucial for boosting overall water splitting.In this work,we first create oxygen vacancies in nickel-iron hydroxide and then transform the hydroxide into NiFe-Vo-P having a nanoarray morphology via phosphorization.During the oxygen evolution reaction,Ni(Fe)OOH and phosphate anions can be in situ formed on the NiFe-Vo-P surface and optimize the adsorption strength of the intermediates.Consequently,NiFe-Vo-P could achieve a high current density of 1.5 A cm^(−2) at an overpotential of 289 mV.Moreover,the superhydrophilic/superaerophobic nanoarray morphology of NiFe phosphide effectively facilitates the mass transfer,and NiFe-Vo-P achieves current densities of 580 mA cm^(−2) and 1.0 A cm^(−2) at a cell voltage of~2.0 V at 25 and 70℃,respectively,over twice those of its counterpart without the superaerophobic morphology.
作者
王珂宇
梁晨
李诗谊
李嘉煜
易致远
徐放
王一兴
雷林峰
朱明辉
李思瑶
庄林洲
徐至
Keyu Wang;Chen Liang;Shiyi Li;Jiayu Li;Zhiyuan Yi;Fang Xu;Yixing Wang;Linfeng Lei;Minghui Zhu;Siyao Li;Linzhou Zhuang;Zhi Xu(State Key Laboratory of Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China)
基金
supported by the National Key R&D Program of China(2021YFB3801301)
the National Natural Science Foundation of China(22075076 and 22005098)
the Central Government Funds for Guiding Local Science and Technology Development(2021Szvup040)。
