Maoyu Wang, Brian A. Muhich, Zizhou He, Zhenzhen Yang, Dongqi Yang, Marcos Lucero, Hoan Kim Khai Nguyen, George E. Sterbinsky, Líney Árnadóttir, Hua Zhou, Ling Fei, Zhenxing Feng
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引用次数: 0
摘要
高效率、低成本的氧进化反应(OER)催化剂对于电化学水分离产生氢气至关重要,而氢气是可持续能源转换和储存的清洁燃料。在新兴的氧进化反应催化剂中,过渡金属二钙化物的活性优于 RuO2 等商业标准,但由于氧进化反应的结构重组失控,其稳定性较差。在本研究中,我们通过调整 CoxNi1-xSy 电催化剂中 Ni 和 Co 的原子比来创建双金属硫化物催化剂,以研究复杂的重组过程。表面敏感的 X 射线光电子能谱和块体敏感的 X 射线吸收光谱证实了 OER 过程中过渡金属硫化物材料的良好重组。我们的研究结果表明,少量的镍取代可以重塑 Co 的局部电子结构,从而调节重组过程,优化 OER 活性和稳定性之间的平衡。这项工作标志着通过掺杂调控重组方法开发高效、不含贵金属的 OER 电催化剂取得了重大进展。
Metal Doping Regulates Electrocatalysts Restructuring During Oxygen Evolution Reaction
High-efficiency and low-cost catalysts for oxygen evolution reaction (OER) are critical for electrochemical water splitting to generate hydrogen, which is a clean fuel for sustainable energy conversion and storage. Among the emerging OER catalysts, transition metal dichalcogenides have exhibited superior activity compared to commercial standards such as RuO2, but inferior stability due to uncontrolled restructuring with OER. In this study, we create bimetallic sulfide catalysts by adapting the atomic ratio of Ni and Co in CoxNi1-xSy electrocatalysts to investigate the intricate restructuring processes. Surface-sensitive X-ray photoelectron spectroscopy and bulk-sensitive X-ray absorption spectroscopy confirmed the favorable restructuring of transition metal sulfide material following OER processes. Our results indicate that a small amount of Ni substitution can reshape the Co local electronic structure, which regulates the restructuring process to optimize the balance between OER activity and stability. This work represents a significant advancement in the development of efficient and noble metal-free OER electrocatalysts through a doping-regulated restructuring approach.
期刊介绍:
ChemSusChem
Impact Factor (2016): 7.226
Scope:
Interdisciplinary journal
Focuses on research at the interface of chemistry and sustainability
Features the best research on sustainability and energy
Areas Covered:
Chemistry
Materials Science
Chemical Engineering
Biotechnology