催化学报 ›› 2026, Vol. 88: 307-321.DOI: 10.1016/S1872-2067(26)65137-6

• 论文 • 上一篇    下一篇

Mn掺杂调控NiCo LDH活性位点用于H2O2与甲酸盐的节能耦合电合成

张家雨a, 王昆a,*(), 于晶露a, 徐凯洋a,b, 杨璐a, 饶佳丽a, 宋树芹a,*(), 王毅a,*()   

  1. a 中山大学化学工程与技术学院、材料科学与工程学院, 广东省低碳化学与过程节能重点实验室, 聚合物复合材料及功能材料教育部重点实验室(PCFM Lab), 广东珠海 519082
    b 松山湖材料实验室, 广东东莞 523429
  • 收稿日期:2026-04-29 接受日期:2026-05-14 出版日期:2026-09-18 发布日期:2026-09-05
  • 通讯作者: *电子信箱: wangk269@mail.sysu.edu.cn (王昆),
    stsssq@mail.sysu.edu.cn (宋树芹),
    wangyi76@mail.sysu.edu.cn (王毅).
  • 基金资助:
    榆林清洁能源创新研究院能源革命科技项目(E511030817);国家自然科学基金(22478450);国家自然科学基金(22478451);国家自然科学基金(22408408);催化基础国家重点实验室(2024SKL-A-013);广东省基础与应用基础研究基金(2024A1515012565);中山大学引进人才启动基金(76110-12256023)

Modulating active sites via Mn-doping in NiCo LDH for energy-saving paired electrosynthesis of H2O2 and formate

Jiayu Zhanga, Kun Wanga,*(), Jinglu Yua, Kaiyang Xua,b, Lu Yanga, Jiali Raoa, Shuqin Songa,*(), Yi Wanga,*()   

  1. a The Key Laboratory of Low-Carbon Chemistry & Energy Conservation of Guangdong Province, PCFM Lab, School of Chemical Engineering and Technology, School of Materials Science and Engineering, Sun Yat-sen University, Zhuhai 519082, Guangdong, China
    b Songshan Lake Materials Laboratory (SLAB), Dongguan 523429, Guangdong, China
  • Received:2026-04-29 Accepted:2026-05-14 Online:2026-09-18 Published:2026-09-05
  • Supported by:
    The Energy Revolution S&T Program of Yulin Innovation Institute of Clean Energy(E511030817);The National Natural Science Foundation of China(22478450);The National Natural Science Foundation of China(22478451);The National Natural Science Foundation of China(22408408);The National State Key Laboratory of Catalysis(2024SKL-A-013);The Guangdong Basic and Applied Basic Research Foundation(2024A1515012565);The Startup Fund for Recruited Talents of Sun Yat-sen University(76110-12256023)

摘要:

过氧化氢(H2O2)作为一种重要的绿色氧化剂, 其传统蒽醌生产工艺存在能耗高、流程繁琐及环境风险高等缺点. 基于两电子氧还原反应(2e- ORR)的电化学合成技术, 可在温和条件下实现H2O2的绿色制备, 被视为理想替代方案. 然而, 在传统H2O2电合成体系中, 阴极2e- ORR通常与阳极析氧反应(OER)配对. 受OER动力学迟缓、过电位高以及阳极产物O2附加值较低等因素限制, 该体系整体能耗偏高、经济性不足, 严重制约了H2O2电合成技术的产业化应用. 针对上述问题, 本文提出以甲醇氧化反应(MOR)替代OER的耦合电解策略, 旨在降低系统能耗的同时, 联产高附加值甲酸盐.
为提升MOR催化性能(尤其降低其起始电位), 本文以泡沫镍为基底, 通过一步水热法原位制备了镍钴层状双氢氧化物(NiCo LDH)及不同锰掺杂量的Mn-NiCo LDH电极. X-射线衍射、透射电镜及X-射线光电子能谱等结果表明, 成功合成了Ni0.61Co0.39 LDH和一系列Mn-NiCo LDH电极. 电化学测试结果表明, 适量Mn掺杂可显著优化MOR动力学, 其中Ni0.50Co0.30Mn0.20 LDH性能最优, 表现出优异的催化活性、选择性与稳定性: 在10 mA cm-2下, 其MOR电位低至1.32 VRHE, 优于未掺杂的Ni0.61Co0.39 LDH (1.37 VRHE); 在100 mA cm-2下可稳定运行超24 h, 工作电位仅1.38 VRHE, 且甲酸盐法拉第效率高达92.92%. 结合原位拉曼光谱与密度泛函理论(DFT)计算阐明了Mn掺杂的催化增强机制. 原位拉曼结果显示, Mn掺杂使Ni3+-O特征峰出现电位负移, 促进了高活性Ni3+/NiOOH物种在更低电位下的生成. DFT计算进一步证实, Mn掺杂显著降低了Ni初始氧化的吉布斯自由能(从1.76降至0.97 eV)和MOR决速步能垒(从6.63降至3.45 eV). 综上, Mn掺杂通过促进活性Ni3+物种生成并优化局域电子结构, 加速了MOR的关键步骤, 从而显著提升了反应动力学. 将Ni0.50Co0.30Mn0.20 LDH@NF作为阳极, 碳纳米管修饰的碳纸(CNTs@CP)作为阴极, 构建2e- ORR||MOR耦合体系. 与传统2e- ORR||OER体系相比, 该耦合体系在50 mA cm-2电流密度时槽压降低了254 mV, H2O2合成的能耗降低10.3%, 净经济效益提升97.9%. 上述结果充分验证了以MOR替代OER在节能降耗与阳极产物增值方面的显著优势.
综上, 本研究不仅为高效MOR催化材料的设计提供了新思路, 也为构建兼具低能耗与高附加值联产特性的H2O2电合成耦合体系提供了坚实的理论与实践基础.

关键词: 过氧化氢电合成, 甲醇氧化反应, 耦合电解, 低能耗

Abstract:

Electrochemical H2O2 synthesis via the two-electron oxygen reduction reaction (2e- ORR) offers a green alternative to the energy-intensive anthraquinone process, but its practical viability is hindered by the sluggish and low-value oxygen evolution reaction (OER) at the anode. Here, we present an energy-saving paired electrolysis strategy that replaces anodic OER with methanol oxidation reaction (MOR) using a ternary Mn-doped NiCo layered double hydroxide (Ni0.50Co0.30Mn0.20 LDH) catalyst in situ grown on nickel foam (NF) by a one-step hydrothermal method. The optimized catalyst achieves a low MOR potential of 1.32 VRHE at 10 mA cm-2 and a formate Faradaic efficiency of 92.9%, outperforming its undoped counterpart (Ni0.61Co0.39 LDH, 1.37 VRHE and 83.3%). In-situ Raman spectroscopy and density functional theory calculations reveal that Mn doping lowers the energy barrier for the Ni2+/Ni3+ redox transition, facilitating the generation of catalytically active Ni3+ species. When coupled with graphitized hydroxyl-functionalized multi-walled carbon nanotubes coated on carbon paper (CNTs@CP) as the 2e- ORR cathode in a two-electrode electrolyzer, at the operation condition of 50 mA cm-2, the 2e- ORR||MOR system delivers a cell voltage reduction of 254 mV, enabling a 10.3% decrease in energy consumption for H2O2 production, compared with the conventional 2e- ORR||OER system. Moreover, the simultaneous generation of value-added formate at the anode yields a 97.9% increase in net economic benefit. This work establishes a generalizable paired electrolysis paradigm for the decentralized, energy-efficient, and economically viable co-production of H2O2 and high-value chemicals.

Key words: Hydrogen peroxide electrosynthesis, Methanol oxidation reaction, Coupled electrolysis, Low energy