In situ coating amorphous boride on ternary pyrite-type boron sulfide for highly efficient oxygen evolution,Journal of Materials Chemistry A

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In situ coating amorphous boride on ternary pyrite-type boron sulfide for highly efficient oxygen evolution
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2021-5-3 , DOI: 10.1039/d0ta10633j
Tingting Li _{1,

2,

3,

4,

5} , Tianyun Jing _{5,

6,

7,

8} , Dewei Rao _{5,

6,

7,

8,

9} , Xiaotian Jia _{1,

2,

3,

4,

5} , Yunpeng Zuo _{10,

11,

12} , Štěpán Kment _{10,

11,

12} , Radek Zbořil _{10,

11,

12}

Affiliation

Multimetallic pyrite-type sulfides have been promising electrocatalytic materials for the electrochemical oxygen evolution reaction (OER), but sulfides still require further improvement due to the easy oxidization of surface atoms and the intrinsically low activity. Herein, we synthesized the ternary pyrite-type boron sulfide in situ coated by amorphous FeCoNiB_x as an efficient and durable heterogeneous catalyst for OER. The spherical aberration-corrected transmission electron microscopy clearly shows that the adjacent crystals exhibit different phases with an approximately 2 nm amorphous layer on the external surface of the catalysts. This hybrid catalyst exhibits the superior OER activity with an attractive overpotential of 419.4 mV vs. RHE at 100 mA cm⁻² in 1 M KOH solution and excellent stability over 10 h. Density functional theory calculations reveal that the B atoms can attract the electrons from metals, resulting in the expansion of the unoccupied d orbitals of metals, which is beneficial to attract the electrons from OH⁻ groups, thus improving the OER performance of the catalyst combined with its special heterostructure. This study provides an advantageous method for engineering the electrical structure of pyrite-type sulfides for high OER activity and long durability.

中文翻译：

在三元黄铁矿型硫化硼上原位涂覆非晶态硼化物以高效释放氧气

黄铁矿型多金属硫化物已成为用于电化学氧释放反应（OER）的有前途的电催化材料，但由于表面原子易于氧化和固有的低活性，硫化物仍需要进一步改进。本文中，我们合成了无定形FeCoNiB _x原位包覆的三元黄铁矿型硫化硼，作为一种高效，持久的OER非均相催化剂。球差校正的透射电子显微镜清楚地表明，相邻的晶体表现出不同的相，在催化剂的外表面上具有约2 nm的非晶层。该杂化催化剂具有卓越的OER活性，相对于100 mA cm处的RHE具有419.4 mV的吸引人的超电势在1 M KOH溶液中^-2，在10小时内具有出色的稳定性。密度泛函理论计算表明，该B原子可以吸引从金属中的电子，从而导致金属的未占用d轨道的扩展，这是有利的，以吸引从OH的电子^-基团，从而提高了催化剂具有组合的OER性能其特殊的异质结构。这项研究提供了一种工程化黄铁矿型硫化物电结构的有利方法，以实现高OER活性和长寿命。

更新日期：2021-05-17

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