Strong Ni–S Hybridization in a Crystalline NiS Electrocatalyst for Robust Acidic Oxygen Evolution,The Journal of Physical Chemistry C

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Strong Ni–S Hybridization in a Crystalline NiS Electrocatalyst for Robust Acidic Oxygen Evolution
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2020-01-27 , DOI: 10.1021/acs.jpcc.9b09796
Lan Wang _{1,

2} , Linlin Cao ₁ , Xiaokang Liu ₁ , Wei Zhang ₁ , Wei Liu ₁ , Xinyi Shen ₁ , Yi Wang ₃ , Tao Yao ₁

Affiliation

Developing low-cost, active, and stable electrocatalysts toward acidic oxygen evolution reaction (OER) is highly desirable for proton electrolyte membrane electrolyzers to produce renewable H₂ energy. 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^–2 with a Tafel slope of 53.2 mV dec^–1.

中文翻译：

结晶NiS电催化剂中的强Ni-S杂化，可强健地释放酸性氧气

对于质子电解质膜电解槽生产可再生的H _2而言，非常需要开发低成本，活性和稳定的酸性氧分解反应（OER）电催化剂。能源。在这里，我们通过一种简便的一步式热解方法报告了一种适用于酸性OER介质的不含贵金属的NiS基电催化剂。制备的NiS颗粒具有高结晶度，并偶联在硫掺杂的碳氮载体上。同步加速器X射线光谱表明，Ni和S的强杂交不仅为水的吸附和解离提供了良好的电子结构，而且还对腐蚀性酸性介质具有很高的稳定性。因此，NiS基电催化剂在10 mA cm ^–2的电流密度和53.2 mV dec ^–1的Tafel斜率下表现出高效率和稳定的OER性能，低过电势为337 mV 。

更新日期：2020-01-27

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