Heterogeneous Synergetic Effect of Metal-Oxide Interfaces for Efficient Hydrogen Evolution in Alkaline Solutions
Heterogeneous Synergetic Effect of Metal-Oxide Interfaces for Efficient Hydrogen Evolution in Alkaline Solutions
复制标题
金属-氧化物界面的异质协同效应在碱性溶液中高效析氢
DOI：
10.1021/acsami.1c00945
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发表时间：
2021
影响因子：
9.5
通讯作者：
Liu Zhi
中科院分区：
文献类型：
--
作者：
Xu Wei;Wang Beibei;Ni Xingming;Liu Huiyan;Wang Wei;Zhang Lunjia;Zhang Hui;Peng Zheng;Liu Zhi
碱性溶液中的水解离是析氢反应（HER）中最大的挑战之一。关键是获得具有最佳和平衡的OH吸附能和H吸附/H2脱附能的催化剂。在此，我们在泡沫镍上合成了Ni 17 W3/WO 2催化剂，优化了Ni 17 W3合金在NiWO 4/WO 2基体上的覆盖率和尺寸。实验结果表明，Ni 17 W3-NiWO 4界面能加速水的解离，Ni 17 W3-WO 2界面能促进吸附的H原子溢出和H2的脱附。此外，我们应用一套表征技术来分析在不同的阴极电位下催化剂的表面演变过程，以说明化学氧化和电化学还原反应之间的竞争。结果表明，大的Ni 17 W3纳米颗粒的高覆盖率导致更稳定的界面。两个有效界面协同促进Volmer-Tafel反应。Ni 17 W3/WO 2催化剂表现出优异的HER活性，在10 mA cm-2电流密度下的过电位为48 mV，Tafel斜率为33 mV dec-1。这项工作表明，具有适当分层界面的低成本催化剂可以被设计并优化成串联系统，这将显着促进HER活性在碱性电解质中。
Water dissociation in alkaline solutions is one of the biggest challenges in hydrogen evolution reactions (HERs). The key is to obtain a catalyst with optimal and balanced OH adsorption energy and H adsorption/H2desorption energy. Herein, we synthesized a Ni17W3/WO2catalyst on the Ni foam that optimized the coverage and size of Ni17W3alloys decorated on the NiWO4/WO2substrate. Our experiments showed that Ni17W3–NiWO4interfaces could accelerate water dissociation, and Ni17W3–WO2interfaces facilitate adsorbed H atoms spillover and H2desorption. In addition, we applied a suite of characterization techniques to analyze surface evolution processes in catalysts under various cathodic potentials so as to illustrate the competition between chemical oxidation and electrochemical reduction reactions. The results demonstrated that high coverage of large Ni17W3nanoparticles resulted in a greater stable interface. The two efficient interfaces synergetically promote the Volmer–Tafel reaction. Ni17W3/WO2catalysts exhibited extraordinary HER activity with a low overpotential of 48 mV at a 10 mA cm–2current density and a Tafel slope of 33 mV dec–1. This work has shown that low-cost catalysts with proper hierarchical interfaces can be engineered and can be optimized into a tandem system, which will significantly promote HER activity in alkaline electrolytes.