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Top-down and facet-selective phase-segregation to construct concave nanocages with strongly coupled hetero-interface for oxygen evolution reaction
Applied Catalysis B: Environment and Energy ( IF 22.1 ) Pub Date : 2021-09-15 , DOI: 10.1016/j.apcatb.2021.120727
Jingchun Wang 1 , Anzhou Yang 1 , Jiatian Li 1 , Keying Su 1 , Yawen Tang 1 , Xiaoyu Qiu 1
Affiliation  

In this study, a top-down and site-selective anion etching method is devised to stepwisely carve out the NiCo(OH)2/NiS2 concave hetero-cages (CHCs) from NiCo Prussian blue analogue (PBA) cube. DFT calculation investigates that the synthetic mechanism is based on anisotropic reactivity of each etchant acted in different facets of NiCo PBA cube and can be generalized to various heterogeneous combinations by tuning their dissolution and reconstitution kinetics (i.e. NiCoB/NiS2, NiCoP/NiS2). Such strategy without adding extra metal source generates strongly coupled heterointerface with hollow, concave, and ultrathin (~16.2 nm) features, which could harvest abundant active sites, tune the electronic structure, and induce strong lattice strain of Ni. Specifically, the NiCo(OH)2/NiS2 CHCs manifest superior activity and stability toward oxygen evolution reaction (OER), with an overpotential of 258.0 mV required for 10.0 mA cm−2, a Tafel slope of 38.3 mV dec−1, and favorable long-term durability in 1.0 M KOH.



中文翻译:

自上而下和小平面选择性相分离构建具有强耦合异质界面的凹形纳米笼用于析氧反应

在这项研究中,设计了一种自上而下和位点选择性的阴离子蚀刻方法,以从 NiCo 普鲁士蓝类似物 (PBA) 立方体中逐步雕刻出 NiCo(OH) 2 /NiS 2凹形异质笼 (CHC)。DFT计算研究了合成机制基于作用于NiCo PBA立方体不同面的每种蚀刻剂的各向异性反应性,并且可以通过调节它们的溶解和重构动力学(NiCoB/NiS 2、NiCoP/NiS 2 )推广到各种异质组合。)。这种不添加额外金属源的策略产生具有空心、凹面和超薄(~16.2 nm)特征的强耦合异质界面,可以收获丰富的活性位点,调整电子结构,并诱导 Ni 的强晶格应变。具体而言,NiCo(OH) 2 /NiS 2 CHC 对析氧反应 (OER) 表现出优异的活性和稳定性,10.0 mA cm -2所需的过电位为 258.0 mV ,Tafel 斜率为 38.3 mV dec -1,并且在 1.0 M KOH 中具有良好的长期耐久性。

更新日期:2021-09-28
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