Yingnan Jiang, Jingkun Yu, Haoqiang Song, Lingling Du, Wenxuan Sun, Yulong Cui, Yuwen Su, Meiling Sun, Guangchao Yin, Siyu Lu
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引用次数: 0
摘要
设计能在各种条件下保持高效率和稳定性的集成整体分水催化剂是未来发展的重要趋势,但这仍然是一项重大挑战。本文通过直接水热法合成了新型纳米花状三金属 Ni-Ru-Mo 磷化物催化剂 ((Ni-Ru-Mo)P@F-CDs),并与掺杂 F 的碳点 (F-CDs) 集成。由于精确的界面工程和电子结构优化,(Ni-Ru-Mo)P@F-CDs 在碱性条件下表现出卓越的双功能催化活性,在 100 mA cm-2 的电流密度下,氧进化反应(OER)和氢进化反应(HER)的过电位分别为 231 mV 和 123 mV。在工业上,只需要 1.426 V 就能达到同样的功效。此外,在 100 mA cm-2 的电流密度下,催化剂在 1 M KOH 和模拟海水中进行整体水分离分别只需要 1.508 V 和 1.564 V 的电压。该催化剂还表现出极佳的稳定性,在 100-200 mA cm-2 的条件下,100 小时内性能下降极小。密度泛函理论计算表明,在 HER 和 OER 过程中,界面结构分别协同优化了 H* 和 O* 中间体的吉布斯自由能,从而加速了电化学水分离动力学。
Enhanced water-splitting performance: Interface-engineered tri-metal phosphides with carbon dots modification
Designing integrated overall water-splitting catalysts that maintain high efficiency and stability under various conditions is an important trend for future development, yet it remains a significant challenge. Herein, novel nanoflower-like tri-metallic Ni–Ru–Mo phosphide catalyst ((Ni–Ru–Mo)P@F-CDs), integrated with F-doped carbon dots (F-CDs), were synthesized via a straightforward hydrothermal process and subsequent phosphatization. Attributable to precise interface engineering and electronic structure optimization, (Ni–Ru–Mo)P@F-CDs exhibit exceptional bi-functional catalytic activity in alkaline conditions, achieving remarkably low overpotentials of 231 and 123 mV for oxygen evolution reaction (OER) and hydrogen evolution reaction (HER), respectively, at a current density of 100 mA cm−2. Industrially, only 1.426 V is needed for the same efficacy. Additionally, the catalyst requires merely 1.508 and 1.564 V for overall water splitting in 1 M KOH and simulated seawater, respectively, at 100 mA cm−2. The catalyst also shows excellent stability, with minimal performance decline over 100 h within 100–200 mA cm−2. Density functional theory calculations indicate that the interface structure synergistically optimizes Gibbs free energy for H* and O* intermediates during HER and OER, respectively, accelerating electrochemical water-splitting kinetics.
期刊介绍:
Carbon Energy is an international journal that focuses on cutting-edge energy technology involving carbon utilization and carbon emission control. It provides a platform for researchers to communicate their findings and critical opinions and aims to bring together the communities of advanced material and energy. The journal covers a broad range of energy technologies, including energy storage, photocatalysis, electrocatalysis, photoelectrocatalysis, and thermocatalysis. It covers all forms of energy, from conventional electric and thermal energy to those that catalyze chemical and biological transformations. Additionally, Carbon Energy promotes new technologies for controlling carbon emissions and the green production of carbon materials. The journal welcomes innovative interdisciplinary research with wide impact. It is indexed in various databases, including Advanced Technologies & Aerospace Collection/Database, Biological Science Collection/Database, CAS, DOAJ, Environmental Science Collection/Database, Web of Science and Technology Collection.