Redox bifunctional activities with optical gain of Ni3S2 nanosheets edged with MoS2 for overall water splitting
Redox bifunctional activities with optical gain of Ni3S2 nanosheets edged with MoS2 for overall water splitting
复制标题
氧化还原双功能活性，具有 MoS2 边缘 Ni3S2 纳米片的光学增益，可实现整体水分解
DOI：
10.1016/j.apcatb.2019.118435
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发表时间：
2020-07-05
影响因子：
22.1
通讯作者：
Xu, Xiaoyong
中科院分区：
文献类型：
--
作者：
Wang, Chengzhong;Shao, Xiaodong;Xu, Xiaoyong
开发具有析氢反应和析氧反应双重功能的低成本催化剂，对水的整体分解具有重要的现实意义。在这里，我们首次报道了一种独特的侧面异质结构的超薄Ni3S2纳米片(NSS)，它是一种高效、耐用的双功能催化剂，可用于碱性介质中的整体水分解。最大限度地利用了有利于氢和氧中间体化学吸附的功能Mo-S-Ni界面，所得到的Ni3S2/MoS2(NIMOS)催化剂在10 mA cm(-2)下对HER和OER分别表现出78 mV和260 mV的低过电位，优于商业基准(IrO2和Pt/C)，是迄今为止报道的最好的记录之一。特别是，NiMOS催化剂由于在Mo-S-Ni界面的光生电荷转移而导致氧化还原动力学加速，从而对HER和OER活性产生了诱人的光增强效应。以NiMOS为双功能催化剂的组合式双电极碱性电解槽，在1.53V的低电池电压下(1太阳照射下为1.50V)，电流密度可达10 mA cm(-2)，且在100h以上具有显著的稳定性，显示出强大的整体水分解能力和可获得的太阳能集成。
Exploring cost-efficient catalysts with bifunctional activities of hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) holds practical significance for overall water splitting. Herein, for the first time, we report a unique lateral heterostructure of ultrathin Ni3S2 nanosheets (NSs) edged with MoS2 as an efficient and durable bifunctional catalyst for overall water splitting in alkaline media. Benefiting from maximizing functional Mo-S-Ni interfaces that favor the chemisorption of hydrogen and oxygen-containing intermediates, the resultant Ni3S2/MoS2 (NiMoS) catalyst exhibits respectively low overpotentials of 78 and 260 mV at 10 mA cm(-2) for HER and OER, superior to the commercial benchmarks (IrO2 and Pt/C), ranking among the best records reported to date. In particular, the NiMoS catalyst renders an attractive light-enhanced effect on both HER and OER activities due to photogenerated charge transfer at Mo-S-Ni interface towards redox kinetic acceleration. An assembled two-electrode alkaline electrolyzer using NiMoS as bifunctional catalysts can deliver a current density of 10 mA cm(-2) at low cell voltage of 1.53 V (1.50 V under 1 sun irradiation) with remarkable stability for over 100 h, demonstrating the robust overall water splitting with accessible solar integration.