催化学报 ›› 2025, Vol. 68: 300-310.DOI: 10.1016/S1872-2067(24)60173-7

• 论文 • 上一篇    下一篇

可见光驱动的CoS2/CuS@CNT-C3N4光催化剂用于500 mW cm-2 以上的高性能可充放电锌-空气电池

张杨a, 徐能能a,*(), 巩兵兵c, 叶笑笑a, 阳宜a, 王昭娣a, 庄碧艳a, 王敏d, Woochul Yange, 刘桂成f, Joong Kee Leeg, 乔锦丽a,b,*()   

  1. a东华大学环境科学与工程学院, 化学纤维与高分子材料改性国家重点实验室, 上海 201620, 中国
    b上海市污染控制与生态安全研究所, 上海 200092, 中国
    c新疆大学化工学院, 石油天然气精细化工教育部暨自治区重点实验室, 新疆乌鲁木齐 830017, 中国
    d盐城工学院化学化工学院, 江苏盐城 224051, 中国
    e东国大学物理系, 首尔, 韩国
    f华北电力大学能源动力与机械工程学院, 北京 102206, 中国
    g嘉泉大学化工与生化工程系, 城南市, 韩国
  • 收稿日期:2024-08-10 接受日期:2024-10-09 出版日期:2025-01-18 发布日期:2025-01-02
  • 通讯作者: * 电子信箱: nengnengxu@dhu.edu.cn (徐能能), qiaojl@dhu.edu.cn (乔锦丽).
  • 基金资助:
    国家重点研发计划(2022YFE0138900);国家自然科学基金(21972017);上海市科委“科技创新行动计划”基础研究领域(19JC1410500)

A visible-light-driven CoS2/CuS@CNT-C3N4 photocatalyst for high-performance rechargeable zinc-air batteries beyond 500 mW cm‒2

Yang Zhanga, Nengneng Xua,*(), Bingbing Gongc, Xiaoxiao Yea, Yi Yanga, Zhaodi Wanga, Biyan Zhuanga, Min Wangd, Woochul Yange, Guicheng Liuf, Joong Kee Leeg, Jinli Qiaoa,b,*()   

  1. aState Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
    bShanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
    cSchool of Chemical Engineering and Technology, Xinjiang University, Urumqi 830017, Xinjiang, China
    dSchool of Chemistry and Chemical Engineering, Yancheng Institute of Technology, Yancheng 224051, Jiangsu, China
    eDepartment of Physics, Dongguk University, Seoul 04620, Korea
    fSchool of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China
    gDepartment of Chemical & Biochemical Eng, Gachon University, Seongnam-si 13120, Korea
  • Received:2024-08-10 Accepted:2024-10-09 Online:2025-01-18 Published:2025-01-02
  • Contact: * E-mail: nengnengxu@dhu.edu.cn (N. Xu), qiaojl@dhu.edu.cn (J. Qiao).
  • Supported by:
    National Key Research and Development Program of China(2022YFE0138900);National Natural Science Foundation of China(21972017);“Scientific and Technical Innovation Action Plan” Basic Research Field of Shanghai Science and Technology Committee(19JC1410500)

摘要:

水系锌-空电池(ZABs)具有理论能量密度大、应用场景广泛的特点, 是新兴的动力电池之一. 它们能够在电池系统中存储太阳能, 为实现可持续发展做出贡献. 然而, 由于空气电极上的氧还原反应(ORR)和析氧反应(OER)的动力学过程缓慢, 大多数已报道的金属硫化物双功能电极的峰值功率密度通常低于200 mW cm-2, 这限制了其在高功率需求场景下的实际应用. 因此, 亟需开发高效、稳定的可见光驱动催化剂.
基于光电耦合机理, 本文设计并开发了具有独特花瓣层状结构的可见光驱动的CoS2/CuS@CNT-C3N4光催化剂, 用于制备高效可见光驱动ZABs的空气电极. 优化后的CoS2/CuS@CNT-C3N4光电催化剂表现出较好的ORR活性(0.84 V)和低OER过电位(0.47 V). 具体来说, 与目前已报道的光电化学ZABs和最先进的双功能催化剂组装的ZABs相比, 由CoS2/CuS@CNT-C3N4光催化剂组装的可见光驱动ZABs表现出更高的功率密度(588.90 mW cm-2)和连续643 h的高度稳定的充放电循环. 更重要的是, ZABs在可见光照射下的充放电压降仅为0.54 V, 明显低于黑暗条件下的0.94 V. 扫描电镜、透射电镜和N2吸附-脱附结果表明, Cu的掺杂可有效降低CoS2/CuS@CNT-C3N4光催化剂中Co基硫化物的聚集, 使其呈现花瓣层状结构, 提高光催化剂的比表面积. 此外, g-C3N4不仅可以作为光收集器, 同时也作为金属硫化物的分散剂, 减少其团聚. 而碳纳米管(CNTs)作为“电子隧道”, 交错于光催化剂g-C3N4和助催化剂CoS2/CuS@CNT之间, 构建高效双功能CoS2/CuS@CNT-C3N4光催化剂. X射线光电子能谱结果表明, Cu的掺杂提高了CoS2/CuS@CNT-C3N4的Co3+峰强度, 降低了Co2+峰强度. 值得一提的是, Co3+处于高活性自旋态, 具有吸引和贡献电子的能力, 有利于提高ORR性能. Cu和Co之间表现出强的电子相互作用, 进一步表明CoS2/CuS@CNT-C3N4光催化剂的成功合成. 同时, 进一步通过一系列光电化学测试探究了具有肖特基异质结结构的CoS2/CuS@CNT-C3N4光催化剂在光电化学ZABs中的工作机制. 在可见光照射下, N型g-C3N4的VB被光子碰撞产生光生电子-空穴对. 在放电过程中, g-C3N4产生的光生电子通过电子隧道(CNTs)转移到助催化剂(CoS2/CuS)上, 参与ORR过程, 增强电催化ORR活性. 同时, 在充电过程中, N型g-C3N4在VB处积累的光生空穴氧化OH-, 参与OER过程, 增强电催化OER活性. 因此, 与黑暗条件相比, 在可见光照射条件下, 由于异质结效应促进了光生载流子的分离, 由CoS2/CuS@CNT-C3N4组装的光增强ZABs的ORR和OER性能有望同时提高.

综上所述, 本文设计了高效、稳定的可见光驱动的双功能催化剂, 为未来可再生能源的实际应用提供了新思路.

关键词: 可见光驱动, CoS2/CuS@CNT-C3N4光催化剂, 锌-空气电池, 异质结, 光生载流子

Abstract:

Storing solar energy in battery systems is crucial to achieving a green and sustainable society. However, the efficient development of photo-enhanced zinc-air batteries (ZABs) is limited by the rapid recombination of photogenerated carriers on the photocathode. In this work, the visible-light-driven CoS2/CuS@CNT-C3N4 photocatalyst with unique petal-like layer structure was designed and developed, which can be used as air electrode for visible-light-driven ZABs. The superior performance of ZABs assembled by CoS2/CuS@CNT-C3N4 was mainly attributed to the successful construction of Schottky heterojunction between g-C3N4 and carbon nanotubes (CNTs), which accelerates the transfer of electrons from g-C3N4 to CoS2/CuS cocatalysts, improves the carrier separation ability, and extends the carrier lifetime. Thereinto, the visible-driven ZABs assembled by CoS2/CuS@CNT-C3N4 photocatalyst has a power density of 588.90 mW cm-2 and a charge-discharge cycle of 643 h under visible light irradiation, which is the highest performance ever reported for photo-enhanced ZABs. More importantly, the charge-discharge voltage drop of ZABs was only 0.54 V under visible light irradiation, which is significantly lower than the voltage drop (0.94 V) in the dark. This study provides a new idea for designing efficient and stable visible-light-driven ZABs cathode catalysts.

Key words: Visible-light-driven, CoS2/CuS@CNT-C3N4 photocatalyst, Zinc-air battery, Heterojunction, Photogenerated carriers