Targeted Synthesis of Unique Nickel Sulfide (NiS, NiS2) Microarchitectures and the Applications for the Enhanced Water Splitting System
Targeted Synthesis of Unique Nickel Sulfide (NiS, NiS2) Microarchitectures and the Applications for the Enhanced Water Splitting System
复制标题
独特硫化镍（NiS，NiS2）微结构的靶向合成及其在增强水分解系统中的应用
DOI：
10.1021/acsami.6b13984
复制
发表时间：
2017-01-25
影响因子：
9.5
通讯作者：
Wang, Yu
中科院分区：
文献类型：
--
作者：
Luo, Pan;Zhang, Huijuan;Wang, Yu
水裂解是满足日益增长的能源需求的理想技术之一。许多材料在这一领域引起了极大的关注。镍基硫化物家族是在水分解领域中具有有趣性质的例子之一。本文提出了一种简单可控的硫化镍合成方法。首先，我们通过水热法制备了NiS2空心微球。通过在特定气氛下的精确热控，制备了NiS多孔空心微球。NiS2应用于析氢反应（HER）中，在酸性介质（174 mV过电位实现10 mA/cm(2)电流密度，Tafel斜率仅为63 mV/dec）和碱性介质（148 mV过电位实现10 mA/cm(2)电流密度，Tafel斜率为79 mV/dec）中均表现出优异的性能。NiS用于析氧反应（OER），显示出320 mV的低过电位，提供10 mA/cm(2)的电流密度，这是值得称赞的。这些结果启发了我们在阴极中使用NiS2作为HER催化剂，在阳极中使用NiS作为OER催化剂来制备高效的水分解体系。该系统具有较高的活动性和良好的稳定性。具体来说，它显示出稳定的电流密度为10 mA/cm(2)，施加电压为1.58 V，这是一个相当可观的水分解电解槽。
Water splitting is one of the ideal technologies to meet the ever increasing demands of energy. Many materials have aroused great attention in this field. The family of nickel-based sulfides is one of the examples that possesses interesting properties in water-splitting fields. In this paper, a controllable and simple strategy to synthesize nickel sulfides was proposed. First, we fabricated NiS2 hollow microspheres via a hydrothermal process. After a precise heat control in a specific atmosphere, NiS porous hollow microspheres were prepared. NiS2 was applied in hydrogen evolution reaction (HER) and shows a marvelous performance both in acid medium (an overpotential of 174 mV to achieve a current density of 10 mA/cm(2) and the Tafel slope is only 63 mV/dec) and in alkaline medium (an overpotential of 148 mV to afford a current density of 10 mA/cm(2) and the Tafel slope is 79 mV/dec). NiS was used in oxygen evolution reaction (OER) showing a low overpotential of 320 mV to deliver a current density of 10 mA/cm(2), which is meritorious. These results enlighten us to make an efficient water-splitting system, including NiS2 as HER catalyst in a cathode and NiS as OER catalyst in an anode. The system shows high activity and good stabilization. Specifically, it displays a stable current density of 10 mA/cm(2) with the applying voltage of 1.58 V, which is a considerable electrolyzer for water splitting.