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A Nanosized CoNi Hydroxide@Hydroxysulfide Core–Shell Heterostructure for Enhanced Oxygen Evolution
Advanced Materials ( IF 27.4 ) Pub Date : 2018-12-05 , DOI: 10.1002/adma.201805658
Bin Wang 1 , Cheng Tang 1 , Hao-Fan Wang 1 , Xiao Chen 1 , Rui Cao 2 , Qiang Zhang 1
Affiliation  

A cost‐effective and highly efficient oxygen evolution reaction (OER) electrocatalyst will be significant for the future energy scenario. The emergence of the core–shell heterostructure has invoked new feasibilities to inspire the full potential of non‐precious‐metal candidates. The shells always have a large thickness, affording robust mechanical properties under harsh reaction conditions, which limits the full exposure of active sites with highly intrinsic reactivity and extrinsic physicochemical characters for optimal performance. Herein, a nanosized CoNi hydroxide@hydroxysulfide core–shell heterostructure is fabricated via an ethanol‐modified surface sulfurization method. Such a synthetic strategy is demonstrated to be effective in controllably fabricating a core–shell heterostructure with an ultrathin shell (4 nm) and favorable exposure of active sites, resulting in a moderately regulated electronic structure, remarkably facilitated charge transfer, fully exposed active sites, and a strongly coupled heterointerface for energy electrocatalysis. Consequently, the as‐obtained hydroxide@hydroxysulfide core–shell is revealed as a superior OER catalyst, with a small overpotential of 274.0 mV required for 10.0 mA cm−2, a low Tafel slope of 45.0 mV dec−1, and a favorable long‐term stability in 0.10 M KOH. This work affords fresh concepts and strategies for the design and fabrication of advanced core–shell heterostructures, and thus opens up new avenues for the targeted development of high‐performance energy materials.

中文翻译:

纳米级CoNi氢氧化物@羟基硫化物核-壳异质结构,用于增强氧的释放

具有成本效益和高效的氧气析出反应(OER)电催化剂对于未来的能源情景将具有重要意义。核-壳异质结构的出现激发了新的可行性,以激发非贵金属候选物的全部潜力。壳始终具有较大的厚度,可以在苛刻的反应条件下提供强大的机械性能,从而限制了具有高固有反应性和最佳物理性能的活性位点的充分暴露。在此,通过乙醇改性的表面硫化方法制备了纳米级的CoNi氢氧化物@羟基硫化物核-壳异质结构。事实证明,这种合成策略可有效地控制制造具有超薄壳层(4 nm)的核-壳异质结构,并有利地暴露出活性位点,从而产生适度调节的电子结构,显着促进了电荷转移,充分暴露了活性位点,以及用于能量电催化的强耦合异质界面。因此,所获得的氢氧化物@羟基硫化物核-壳被证明是一种出色的OER催化剂,对于10.0 mA cm所需的小过电势为274.0 mV。-2,低Tafel斜率为45.0 mV dec -1,在0.10 M KOH中具有良好的长期稳定性。这项工作为高级核-壳异质结构的设计和制造提供了新的概念和策略,从而为高性能能源材料的目标开发开辟了新途径。
更新日期:2018-12-05
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