富含氧空位的NiFe氢氧化物衍生的具有超疏气纳米阵列形貌的磷化物及其全解水性能  

Oxygen vacancy-rich nickel-iron hydroxides-derived phosphide with superaerophobic nanoarray morphology for robust overall water splitting

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)

机构地区：[1]State Key Laboratory of Chemical Engineering,School of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China

出　　处：《Science China Materials》2023年第7期2662-2671,共10页中国科学（材料科学（英文版）

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)。

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.

关 键 词：oxygen vacancies kirkendall voids superhydrophilic/superaerophobic surface nickel(iron)oxyhydroxides water splitting 

分 类 号：TQ116.2[化学工程—无机化工] TQ426[一般工业技术—材料科学与工程] TB383.1