Strong Ni-S Hybridization in a Crystalline NiS Electrocatalyst for Robust Acidic Oxygen Evolution
Strong Ni-S Hybridization in a Crystalline NiS Electrocatalyst for Robust Acidic Oxygen Evolution
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结晶 NiS 电催化剂中的强 Ni-S 杂化可实现稳定的酸性析氧
DOI：
10.1021/acs.jpcc.9b09796
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发表时间：
2020
影响因子：
3.7
通讯作者：
Yao Tao
中科院分区：
文献类型：
--
作者：
Wang Lan;Cao Linlin;Liu Xiaokang;Zhang Wei;Liu Wei;Shen Xinyi;Wang Yi;Yao Tao
开发低成本、高活性、高稳定性的酸性析氧电催化剂是质子电解膜电解槽生产可再生氢能源的迫切需求。在这里，我们报告了一种不含贵金属的NiS基电催化剂，适用于酸性OER介质，通过一个简单的一步热解方法。制备的NiS颗粒显示出高结晶度，并偶联在硫掺杂的碳氮载体上。同步辐射X射线光谱表明，Ni和S的强杂化不仅为水的吸附和解离提供了有利的电子结构，而且还提供了对腐蚀性酸性介质的高稳定性。因此，NiS基电催化剂表现出高效率和稳定的OER性能，在10 mA cm-2的电流密度下具有337 mV的低过电位，Tafel斜率为53.2 mV dec-1。
Developing low-cost, active, and stable electrocatalysts toward acidic oxygen evolution reaction (OER) is highly desirable for proton electrolyte membrane electrolyzers to produce renewable H2energy. Here, we report a noble metal-free NiS-based electrocatalyst suitable for acidic OER media through a facile one-step pyrolysis approach. The prepared NiS particles display high crystallinity and are coupled on a sulfur-doped carbon nitrogen support. Synchrotron X-ray spectroscopies demonstrate that the strong hybridization of Ni and S not only provides a favorable electronic structure for the adsorption and dissociation of water but also offers high stability against the corrosive acidic media. Consequently, the NiS-based electrocatalyst exhibits high efficiency and stable OER performance with a low overpotential of 337 mV at a current density of 10 mA cm–2with a Tafel slope of 53.2 mV dec–1.