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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >Optimized hierarchical nickel sulfide as a highly active bifunctional catalyst for overall water splitting
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Optimized hierarchical nickel sulfide as a highly active bifunctional catalyst for overall water splitting

机译：优化分层硫化镍作为总体分裂的高活性双功能催化剂

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摘要

Rational design of non-noble metal electrocatalysts with high intrinsic activity for both the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) is extremely impressive for sustainable electrocatalytic water splitting systems. However, it still remains a major challenge to engineer bifunctional performance. Here, we put forward a highly efficient water electrolyzer based on Ni3S2-based materials. The hierarchical structure of Ni3S2 can be well regulated for optimizing the HER catalytic activity. The best c-Ni3S2/NF electrode exhibits a much smaller overpotential of 220 mV to reach the current density of 100 mA cm(-2). Upon introducing Fe species onto the Ni3S2/NF electrode by a simple dipping/drying method, the intrinsic OER activity can be extremely improved. As a result, the Fe-c-Ni3S2/NF catalyst showed excellent catalytic activity for the OER, including an overpotential of 193 mV at 10 mA cm(-2), high specific current density and excellent stability. Post-characterization studies proved that the remaining S anions have an effective influence on improving the OER intrinsic activity. The assembled water electrolyzer also presented superior performance, such as a very low cell voltage of 1.50 V at 10 mA cm(-2) and excellent durability for 120 h in alkaline medium. This strategy provides a promising way to design highly active and low-cost materials for overall water electrolysis.
机译：非贵金属电催化剂在析氧反应（OER）和析氢反应（HER）中均具有较高的固有活性，合理的设计对于可持续的电催化水分解系统来说是非常令人印象深刻的。然而，它仍然是工程双功能性能的主要挑战。在此，我们提出了一种基于Ni3S2基材料的高效水电解槽。Ni3S2的层次结构可以很好地调节，以优化HER催化活性。最好的c-Ni3S2/NF电极表现出更小的220 mV过电位，以达到100 mA cm（-2）的电流密度。通过简单的浸渍/干燥方法将Fe物种引入Ni3S2/NF电极，可以极大地提高固有OER活性。结果表明，Fe-c-Ni3S2/NF催化剂对OER表现出优异的催化活性，包括在10ma-cm（-2）下的过电位为193mv、高比电流密度和优异的稳定性。后表征研究证明，剩余的S阴离子对提高OER固有活性有有效影响。组装后的水电解槽也表现出了优越的性能，例如在10毫安厘米（-2）下电池电压非常低，为1.50伏，在碱性介质中具有120小时的优异耐久性。这一策略为设计高活性、低成本的水电解材料提供了一种很有前途的方法。

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