Self-supported NiFe-LDH@CoSx nanosheet arrays grown on nickel foam as efficient bifunctional electrocatalysts for overall water splitting
Self-supported NiFe-LDH@CoSx nanosheet arrays grown on nickel foam as efficient bifunctional electrocatalysts for overall water splitting
复制标题
在泡沫镍上生长的自支撑 NiFe-LDH@CoSx 纳米片阵列作为整体水分解的高效双功能电催化剂
DOI：
10.1016/j.cej.2021.129512
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发表时间：
2021-04-02
影响因子：
15.1
通讯作者：
Ma, Shulan
中科院分区：
文献类型：
--
作者：
Yang, Yan;Xie, Yuchen;Ma, Shulan
电催化水裂解制氢技术是解决能源危机和环境问题的一项有前景的绿色技术。开发高效、低成本的电催化剂是实现水裂解大规模制氢的关键。我们通过在多孔泡沫镍（NF）支撑的二维（2D） NiFe-LDH纳米片上电沉积无定形CoSx，组装了独立的3D NiFe-LDH@CoSx/NF双功能电催化剂。CoSx her活性电催化剂与NiFe-LDH出色的OER催化剂相结合，保证了双功能电催化活性。此外，在非晶态CoSx和nfe - ldh纳米片之间构建的界面的形成协同有利于电子转移。因此，这种新型NiFe-LDH@CoSx/NF分层组件需要136 mV （HER）和206 mV （OER）的超低过电位才能在碱性介质（1 M KOH）中提供10 mA cm（-2）的电流密度。基于NiFe-LDH@CoSx/NF的电解槽产生极低的电池电压（1.537 V）和良好的耐用性。本研究为简便制备低成本电催化剂提供了一种有前途的策略，从而提高了电催化整体水分解的性能。
Electrocatalytical water splitting to produce hydrogen energy is a promising green technology to solve energy crisis and environmental issues. The development of highly efficient and low-cost electrocatalysts is crucial for mass hydrogen production from water splitting. We newly assemble the self-standing 3D NiFe-LDH@CoSx/NF bifunctional electrocatalysts, via the electrodeposition of amorphous CoSx on two-dimensional (2D) NiFe-LDH nanosheets which are supported by porous nickel foam (NF). The integration of HER-active electrocatalyst of CoSx with outstanding OER catalyst of NiFe-LDH guarantees the bifunctional electrocatalytic activity. Furthermore, the formation of the constructed interfaces between amorphous CoSx and NiFe-LDH nanosheets synergistically favors the electron transfer. Therefore, this novel NiFe-LDH@CoSx/NF hierarchical assembly needs ultralow overpotentials of 136 mV (for HER) and 206 mV (for OER) to afford the 10 mA cm(-2) current density in alkaline medium (1 M KOH). An electrolyzer based on the NiFe-LDH@CoSx/NF produces an extremely low cell voltage (1.537 V) and good durability. This study offers a promising strategy for facile fabrication of low-cost electrocatalysts which boost the electrocatalytic performance for overall water splitting.