黑龙江大学付宏刚团队报道了晶格膨胀含钒CoP₂用于高效酸性全水分解。相关研究成果发表在2022年1月5日出版的《德国应用化学》。

酸性介质中的质子交换膜水电解槽（PEMWE）是利用可再生能源制氢的一个有前途的方案，但最大的挑战在于替代贵金属催化剂。

该文中，研究人员通过将钒加入到CoP₂晶格中，成功地制备了排列在碳布上的V-CoP₂多孔纳米线的鲁棒电催化剂。结构表征和理论分析表明，V掺杂引起的CoP₂晶格膨胀导致d带中心的上移，有利于氢吸附促进析氢反应（HER）。此外，V促进表面重构，以生成更厚的含氧空位的Co₃O₄层，从而增强耐酸腐蚀性，优化对水和含氧物种的吸附，从而提高析氧反应（OER）的活性和稳定性。因此，其表现出优越的酸性整体水分解活性（1.47V@10mA cm^-2）至Pt-C/CC | | RuO₂/CC（1.59V@10mA-cm^-2）和显著的稳定性。

该工作为PEMWE设计高效的非贵金属电催化剂提供了一条新的途径。

附：英文原文

Title: Vanadium-Incorporated CoP2 with Lattice Expansion for Highly Efficient Acidic Overall Water Splitting

Author: Honggang Fu, Yu Wang, Yanqing Jiao, Ganceng Yang, Haijing Yan, Chungui Tian, Aiping Wu, Yue Liu

Issue&Volume: 2022-01-05

Abstract: Proton exchange membrane water electrolyzer (PEMWE) in acidic medium is a hopeful scenario for hydrogen production by using renewable energy, but the grand challenge lies in substituting noble-metal catalysts. Herein, a robust electrocatalyst of V-CoP2 porous nanowires arranged on carbon cloth is successfully fabricated via incorporating vanadium into CoP2 lattice. Structural characterizations and theoretical analysis indicate that lattice expansion of CoP2  caused by V incorporationresults in the upshift of d-band center, which is conducive to hydrogen adsorption for boosting hydrogen evolution reaction (HER). Besides, V promotes surface reconstruction to generate a thicker Co3O4   layer with oxygen vacancy that enhances acid-corrosion resistance and optimizes the adsorption of water and oxygen-containing species, thus improving activity and stability toward oxygen evolution reaction (OER). Accordingly, it presents a superior acidic overall water splitting activity (1.47 V@10  mA cm-2) to Pt-C/CC||RuO  2  /CC (1.59 V@10  mA cm-2), and remarkable stability. This work proposes a new route to design efficient non-noble metal electrocatalysts for PEMWE.

DOI: 10.1002/anie.202116233

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202116233