Self-supported nickel sulfide derived from nickel foam for hydrogen evolution and oxygen evolution reaction: effect of crystal phase switching
Self-supported nickel sulfide derived from nickel foam for hydrogen evolution and oxygen evolution reaction: effect of crystal phase switching
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DOI：
10.1088/1361-6528/abc852
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发表时间：
2020-12
期刊：
影响因子：
3.5
通讯作者：
Wenshu Yang;Shuaishuai Wang;W. Luo;Longhua Li;Jinhui Hao;Weidong Shi
中科院分区：
文献类型：
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作者：
Wenshu Yang;Shuaishuai Wang;W. Luo;Longhua Li;Jinhui Hao;Weidong Shi
设计和制造经济可行、高活性和稳定的电催化剂对析氢反应（HER）和析氧反应（OER）具有重要意义。晶相是决定电化学性能和电催化反应途径的关键因素。本文提出了泡沫镍衍生硫化一步法合成自支撑NiS2和Ni3S2的方法。通过一系列先进的表征和密度泛函理论计算，评估了与电催化行为相关的晶体相依赖的化学性质。总体而言，自支撑Ni3S2在碱性条件下对HER和OER均表现出较高的电化学活性，其电流密度为10 mA cm−2，OER和HER的过电位分别为245 mV和123 mV。当采用自支撑Ni3S2作为双功能电催化剂进行整体水分解时，整个装置在1.61 V下提供10 mA cm−2的电流密度。这些结果表明，通过控制晶相可以大大提高电催化性能，为先进材料的设计和开发提供了前景。
Designing and fabricating economically viable, high active and stable electrocatalysts play an important role for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER). Crystal phase is the crucial factor that governs the electrochemical property and electrocatalytic reaction pathways. Here, a one-step nickel foam derived sulfidation method was presented to synthesize self-supported NiS2 and Ni3S2. The crystal phase-dependent chemical properties related to electrocatalytic behavior were evaluated by a series of advanced characterization and density functional theory calculations. Overall, the self-supported Ni3S2 shows high electrochemical activity towards both HER and OER in alkaline conditions, which afford the current density of 10 mA cm−2 with overpotentials of 245 mV for OER and 123 mV for HER, respectively. When employed the self-supported Ni3S2 as the bifunctional electrocatalysts for overall water splitting, the entire device provides the current density of 10 mA cm−2 at 1.61 V. These results indicate that the electrocatalytic properties can be exert greater improved by controlling the crystal phase, offering the prospect for advanced materials design and development.