A nickel nanocatalyst within a h-BN shell for enhanced hydrogen oxidation reactions.
A nickel nanocatalyst within a h-BN shell for enhanced hydrogen oxidation reactions.
复制标题
h-BN 壳内的镍纳米催化剂可增强氢氧化反应
DOI：
10.1039/c7sc01615h
复制
发表时间：
2017-08-01
期刊：
影响因子：
8.4
通讯作者：
Bao X
中科院分区：
文献类型：
--
作者：
Gao L;Wang Y;Li H;Li Q;Ta N;Zhuang L;Fu Q;Bao X
h-BN 壳的限域效应有助于维持活性金属镍核并增强 h-BN/Ni 界面处发生的 HOR 过程。开发低成本和高性能电催化剂仍然是碱性膜燃料电池中氢氧化反应（HOR）的一个挑战。在这里，我们报道了新型 Ni@h-BN 核壳纳米催化剂，由封装在几层 h-BN 壳中的镍纳米颗粒组成。与裸镍纳米粒子相比，Ni@h-BN 催化剂表现出改善的 HOR 性能。原位表征实验和密度泛函理论计算表明，h-BN壳层下O、H和OH物种与Ni表面的相互作用减弱，这有助于在空气和电解液中保持活性金属Ni相，并加强h-BN/Ni界面处发生的HOR过程。这些结果提出了一种设计用于 HOR 反应的封装二维材料覆盖层的高性能非贵金属电催化剂的新途径。
The confinement effect of h-BN shells helps to maintain active metallic Ni cores and strengthen the HOR processes occurring at h-BN/Ni interfaces. The development of low-cost and high-performance electrocatalysts remains a challenge for the hydrogen oxidation reaction (HOR) in alkaline membrane fuel cells. Here, we have reported novel Ni@h-BN core–shell nanocatalysts consisting of nickel nanoparticles encapsulated in few-layer h-BN shells. The Ni@h-BN catalysts exhibit an improved HOR performance compared with the bare Ni nanoparticles. In situ characterization experiments and density functional theory calculations indicate that the interactions of the O, H, and OH species with the Ni surface under the h-BN shell are weakened, which helps to maintain the active metallic Ni phase both in air and in the electrolyte and strengthen the HOR processes occurring at the h-BN/Ni interfaces. These results suggest a new route for designing high-performance non-noble metal electrocatalysts with encapsulating two-dimensional material overlayers for HOR reactions.
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