Structural engineering and electronic state tuning optimization of molybdenum-doped cobalt hydroxide nanosheet self-assembled hierarchical microtubules for efficient electrocatalytic oxygen evolution.
Structural engineering and electronic state tuning optimization of molybdenum-doped cobalt hydroxide nanosheet self-assembled hierarchical microtubules for efficient electrocatalytic oxygen evolution.
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DOI：
10.1016/j.jcis.2022.08.069
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发表时间：
2022-08
影响因子：
9.9
通讯作者：
Chao Wang;W. Li;A. Kistanov;Harishchandra Singh;Y. Kayser;Wei Cao;B. Geng
中科院分区：
文献类型：
--
作者：
Chao Wang;W. Li;A. Kistanov;Harishchandra Singh;Y. Kayser;Wei Cao;B. Geng
钴基氢氧化物是析氧反应的理想选择。在此，我们使用氧化钼纳米棒作为牺牲模板，基于结构工程策略构建了自支撑钼掺杂氢氧化钴纳米片分级微管结构，以提高催化剂的活性面积。 X射线光谱测试表明，具有四面体配位的Mo（VI）嵌入到氢氧化钴的层间，促进层间分离。同时，Mo与Co通过氧键连接，促进Co电荷向Mo的转移，降低Co离子的电子云密度。在 1 M KOH 中，优化的钼掺杂氢氧化钴纳米片微管仅需要 288 mV 的过电位即可驱动 10 mA cm−2 的电流密度，明显优于纯 Co(OH)2 纳米片和 RuO2。结构工程和电子态调控可以有效提高钴基氢氧化物的析氧活性，这为开发高效析氧催化剂提供了设计思路。
Cobalt-based hydroxide are ideal candidates for the oxygen evolution reaction. Herein, we use molybdenum oxide nanorods as sacrificial templates to construct a self-supporting molybdenum-doped cobalt hydroxide nanosheet hierarchical microtubule structure based on a structural engineering strategy to improve the active area of the catalyst. X-ray-based spectroscopic tests revealed that Mo (VI) with tetrahedral coordination intercalated into the interlayer of cobalt hydroxide, promoting interlayer separation. At the same time, Mo is connected with Co through oxygen bonds, which promotes the transfer of Co charges to Mo and reduces the electron cloud density of Co ions. In 1 M KOH, optimized molybdenum-doped cobalt hydroxide nanosheet microtubules only needs an overpotential of 288 mV to drive a current density of 10 mA cm−2, which is significantly better than that of pure Co(OH)2nanosheets and RuO2. Structural engineering and electronic state regulation can effectively improve the oxygen evolution activity of cobalt-based hydroxide, which provides a design idea for the development of efficient oxygen evolution catalysts.