Modulating Electronic Structure of Cobalt Phosphide Precatalysts via Dual-Metal Incorporation for Highly Efficient Overall Water Splitting,ACS Applied Energy Materials

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Modulating Electronic Structure of Cobalt Phosphide Precatalysts via Dual-Metal Incorporation for Highly Efficient Overall Water Splitting
ACS Applied Energy Materials ( IF 5.4 ) Pub Date : 2019-10-10 00:00:00 , DOI: 10.1021/acsaem.9b01501
Shiqing Ding ₁ , Dengfeng Cao ₁ , Daobin Liu ₁ , Yunxiang Lin ₁ , Changda Wang ₁ , Chuanqiang Wu ₁ , Yuzhu Zhou ₁ , Shuangming Chen ₁ , Li Song ₁

Affiliation

Electrochemical water splitting is a promising strategy to generate highly purified molecular hydrogen (H₂) without any pollutants, but several challenges have impeded its large-scale application because of the lack of low-cost and highly efficient electrocatalysts. Here, the cobalt phosphide (CoP) as an ideal candidate was synthesized for the catalyzed hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) in alkaline electrolytes, where the incorporation of dual-metal species (W and Fe) was further used to modulate the electronic structure of the pristine CoP nanosheets to accelerate the electrocatalytic kinetics. As expected, the trimetallic phosphide W,[email protected]/CNTs catalyst shows remarkable electrocatalytic performances in terms of small overpotentials of 130 mV for HER and 290 mV for OER and superior stabilities for more than 18 h. It is worth noting that the electro-derived self-reconstruction happened to generate the true catalytically active sites, which results in the cobalt oxy/hydroxides after the OER process and metallic cobalt species after the HER process. This work highlights a rational design of phosphide-based electrocatalysts via the incorporation of multimetal species, which could facilitate the oxidation and reduction of as-prepared catalyst and enhance the performances in the electro-derived processes.

中文翻译：

通过双金属结合调节磷化钴预催化剂的电子结构，以实现高效的总水分解

电化学水分解是产生高纯度分子氢（H ₂）不含任何污染物，但是由于缺乏低成本和高效的电催化剂，许多挑战阻碍了其大规模应用。在此，合成了理想的磷化钴（CoP），用于碱性电解液中的催化放氢反应（HER）和放氧反应（OER），其中还使用了掺入双金属物质（W和Fe）调节原始CoP纳米片的电子结构，以加速电催化动力学。正如预期的那样，三金属磷化物W，[电子邮件保护] / CNTs催化剂显示出卓越的电催化性能，其中HER的小过电势为130 mV，OER的小过电势为290 mV，并且在超过18 h内具有出色的稳定性。值得注意的是，电衍生的自我重建恰好产生了真正的催化活性位点，这导致了OER工艺后的氧化钴/氢氧化物和HER工艺后的金属钴物种。这项工作强调了通过引入多金属物质合理设计基于磷化物的电催化剂的方法，这可以促进氧化和还原制得的催化剂，并提高在电衍生过程中的性能。

更新日期：2019-10-10

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