In-situ growing low-crystalline Co9S8-Ni3S2 nanohybrid on carbon cloth as a highly active and ultrastable electrode for the oxygen evolution reaction
In-situ growing low-crystalline Co9S8-Ni3S2 nanohybrid on carbon cloth as a highly active and ultrastable electrode for the oxygen evolution reaction
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DOI：
10.1016/j.electacta.2021.139558
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发表时间：
2021-11
影响因子：
6.6
通讯作者：
Zhongwu Nie;Tiantian Liu;Yifei Chen;Peng Liu;Yiqiong Zhang;Zheqiong Fan;Hao He;Shuguang Chen-Shuguang-Ch
中科院分区：
文献类型：
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作者：
Zhongwu Nie;Tiantian Liu;Yifei Chen;Peng Liu;Yiqiong Zhang;Zheqiong Fan;Hao He;Shuguang Chen-Shuguang-Ch
高活性的析氧电极对于提高电催化水裂解制氢的整体效率至关重要。在快速硫化和晶格错配生长的共同作用下，我们展示了一种促进原位硫化的策略，构建了低晶co9s8单键ni3s2纳米杂化物的无添加剂电极。co9s8单键ni3s2纳米杂化物呈现出由纳米片相互连接而成的半球形结构，并含有平均孔径为12.66 nm的介孔。ni3s2和co9s8的结晶度分别为18.66%和5.46%。对于1 M KOH的OER，电极在220 mV的过电位（η10）下达到10 mA cm - 2的基准，并且在约50 mA cm - 2下持续900小时的OER稳定性令人印象深刻，这突出了其在水分解装置中的巨大应用潜力。更重要的是，本工作揭示了低晶co9s8单键ni3s2纳米杂化物对高效OER的重要贡献，与电催化活性相关的动态平衡在维持超长期稳定性中的关键作用，以及co9s8单键ni3s2物质向coooh单键niooh物质演化的机制。
The highly active electrodes for the oxygen evolution reaction (OER) are vital for boosting the overall efficiency of electrocatalytic water splitting to produce hydrogen fuel. Here we demonstrate a facilein-situsulfurization strategy to construct an additive-free electrode with low-crystalline Co9S8single bondNi3S2nanohybrid under the joint effects of fast sulfurization and lattice-mismatched growth. The Co9S8single bondNi3S2nanohybrid exhibits semi-spherical architecture constructed with interconnected nanoflakes, and contains mesopores with an average pore size of 12.66 nm. The crystalline degrees of Ni3S2and Co9S8in the nanohybrid are estimated to be as low as 18.66% and 5.46%, respectively. For OER in 1 M KOH, the electrode attains a benchmark of 10 mA cm−2at a very low overpotential (η10) of 220 mV and impressively demonstrates the outstanding OER stability lasting for 900 h at about 50 mA cm−2, which highlights its great potential applications in water splitting devices. More importantly, this work discloses the crucial contribution from low-crystalline Co9S8single bondNi3S2nanohybrid to the high-efficiency OER, the key role of dynamic balance related to electroctatalytic activity in sustaining the ultralong-term stability, and the mechanisms behind the matter evolutions from Co9S8single bondNi3S2into CoOOHsingle bondNiOOH species.