Ruthenium-nickel sandwiched nanoplates for efficient water splitting electrocatalysis
Ruthenium-nickel sandwiched nanoplates for efficient water splitting electrocatalysis
复制标题
用于高效水分解电催化的钌镍夹心纳米板
DOI：
10.1016/j.nanoen.2018.02.017
复制
发表时间：
2018-05-01
期刊：
影响因子：
17.6
通讯作者：
Huang, Xiaoqing
中科院分区：
文献类型：
--
作者：
Ding, Jiabao;Shao, Qi;Huang, Xiaoqing
由于催化剂中的界面直接影响催化性能，因此必须在界面处创建具有调制原子排列的分层纳米结构以实现催化优化。在此，我们报告了一种前所未有的钌镍（Ru-Ni）异质结构，具有相分离的三明治状形态，可增强电催化作用。 Ru选择性地生长在Ni柱的两端，其中Ru和Ni域之间形成紧密的界面。我们发现这种钌镍夹层纳米板（SN）在碱性电解质中对析氢反应（HER）和析氧反应（OER）非常有效，具有非常低的过电势和塔菲尔斜率。值得注意的是，优化后的 Ru-Ni SN 具有仅为 1.45 V 的低起始电位，并增强了整个水分解装置的耐用性，这表明它是一种有前途的实用碱性电解电催化剂。
Since the interface in catalyst directly influences the catalytic performance, it is imperative to create hierarchical nanostructures with modulated atomic arrangements at the interfaces for catalysis optimization. Herein, we report an unprecedented ruthenium-nickel (Ru-Ni) heterostructure with phase-segregated sandwich-like morphology for boosting electrocatalysis. The Ru selectively grows at the two ends of the Ni pillar, in which intimate interfaces is formed between Ru and Ni domains. We found such Ru-Ni sandwiched nanoplates (SNs) are highly efficient for both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline electrolytes with very low overpotentials and Tafel slopes. Significantly, the optimized Ru-Ni SNs deliver a low onset potential of only 1.45 V and enhanced durability in the overall water splitting device, indicating a promising electrocatalyst towards the practical alkaline electrolysis.