Topotactic BI 3 -assisted borodization: synthesis and electrocatalysis applications of transition metal borides
Topotactic BI 3 -assisted borodization: synthesis and electrocatalysis applications of transition metal borides
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拓扑定向BI 3 辅助硼化：过渡金属硼化物的合成和电催化应用
DOI：
10.1039/d2ta04266e
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发表时间：
2022
影响因子：
11.9
通讯作者：
Costa Figueiredo, Marta
中科院分区：
文献类型：
--
作者：
Woo, Katherine E.;Kong, Seongyoung;Chen, Wei;Chang, Tsz Hin;Viswanathan, Gayatri;Díez, Aida M.;Sousa, Viviana;Kolen'ko, Yury V.;Lebedev, Oleg I.;Costa Figueiredo, Marta
以三碘化硼（BI_3）为原料，与过渡金属元素反应，合成了过渡金属硼化物。该方法采用相对低的合成温度来提供各种二元和三元金属硼化物的单相样品，例如Fe 2B、Co 2B、Ni 3B、TiB 2、VB 2、CrB 2和Ni 2CoB。该合成方案可用于金属形状向其各自的硼化物的拓扑异构转化，如由Ni泡沫向Ni 3B泡沫的转化所例示的。原位粉末X射线衍射研究的Ni-BI 3系统表明，结晶镍硼化物，Ni 4 B 3和Ni 2B，开始形成的温度低至700 K和877 K，分别，这是显着低于典型的合成温度所需的生产这些硼化物。用该方法合成的Ni 3B作为催化剂在酸性介质中进行了析氧反应的研究。IrO 2/Ni 3B的复合电催化剂只有50%的IrO 2表现出类似于纯IrO 2的电流密度和稳定性，在低于0.5 mg cm-2的质量负载，表明Ni 3B可能是一个有前途的酸性OER的载体材料。
A facile and universal route for synthesizing transition metal borides has been developed by reaction of boron triiodide (BI3) with elemental transition metals. This method employs relatively low synthesis temperatures to afford single-phase samples of various binary and ternary metal borides, such as Fe2B, Co2B, Ni3B, TiB2, VB2, CrB2, and Ni2CoB. This synthesis protocol can be utilized for the topotactic transformation of metal shapes into their respective borides, as exemplified by transformation of Ni foam to Ni3B foam. In situ powder X-ray diffraction studies of the Ni–BI3 system showed that the crystalline nickel borides, Ni4B3 and Ni2B, start to form at temperatures as low as 700 K and 877 K, respectively, which is significantly lower than the typical synthesis temperatures required to produce these borides. Ni3B synthesized by this method was tested as a supporting material for oxygen evolution reaction (OER) in acidic media. Composite electrocatalysts of IrO2/Ni3B with only 50% of IrO2 exhibit current densities and stability similar to pure IrO2 at mass loadings lower than 0.5 mg cm−2, indicating Ni3B could be a promising supporting material for acidic OER.