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太原理工大学王美玲/吉林大学揣明艳,最新AFM:Ru-W₂C Janus肖特基结通过双通道氢供应以加速碱性析氢反应

  • 2026-04-17 13:00:16
太原理工大学王美玲/吉林大学揣明艳,最新AFM:Ru-W₂C Janus肖特基结通过双通道氢供应以加速碱性析氢反应
第一作者:苗雨民
通讯作者:王美玲、揣明艳
通讯单位:太原理工大学、吉林大学
研究背景和意义

本研究针对碱性析氢反应(HER)中水分解动力学缓慢的问题,设计了一种有序的Ru-W₂C Janus肖特基结催化剂。

通过“梯度双限域热解”策略构建了具有紧密界面的Janus结构,实现了肖特基结的充分活化。实验与理论计算表明,该结两侧能同时解离水,形成向界面中心供给H的“双通道”机制,且界面活性位可抵抗OH竞争吸附。该催化剂在碱性HER中表现出卓越活性(η₁₀₀=69.5 mV)与稳定性(>500 h),并在1 A cm⁻²下实现1.79 V的低电解电压。该工作揭示了“双通道供氢”机制,为设计高效多活性位催化剂提供了新思路。

研究要点

要点1. 创新的“双通道氢供给”机制

作者突破了传统异质结“双位点”机制(一个位点解离水,另一个位点生成氢气)的限制,通过构建有序的Janus肖特基结,实现了结两侧的非界面区域同时解离水分子,如同“双通道”共同向界面活性位点供给H*。这一机制显著降低了水离解能垒,缩短了反应路径,是碱性HER动力学提升的核心突破。

要点2. 有序Janus肖特基结的精准构筑

作者开发了一种“渐进式双限域热解”策略,成功制备了具有清晰空间分隔与晶格匹配的Ru-W₂C Janus型有序异质结。这种精确的原子级结构控制,克服了传统异质结界面无序导致的活性位点利用不充分问题,为“双通道”机制的有效运行提供了关键的结构基础。

要点3. 界面与非界面区域的协同作用

该Janus肖特基结不仅优化了界面电荷重排,还调控了非界面区域的远程电荷分布,实现了界面位点、非界面Ru位点和非界面W位点三者的功能协同。具体表现为:非界面区域强吸附并解离H₂O/OH,而界面位点则专一性强吸附H并弱吸附*OH,从而高效抗中毒并促进H₂生成。

图1 Ru-W₂C@C的合成路线与结构特征。(a) Ru-W₂C@C制备过程的示意图;(b) Ru-W₂C@C的HAADF-STEM图像;(c) Ru-W₂C@C的HAADF-STEM图像及对应的EDS元素分布图;(d) XRD图谱;(e) Ru K边傅里叶变换XAS谱图;(f) Ru-W₂C和RuC/W₂C的形成能。

图3 在1M KOH中的电化学性能和AEMWE性能。(a) Ru-W₂C@C、W₂C@C、Ru/C和Pt/C的LSV曲线;(b) Tafel曲线图;(c) 比较综合HER指标的雷达图;(d) Ru-W₂C@C的耐久性;(e) 分别以NiFe LDH、Ru-W₂C@C和Pt/C催化剂作为阳极和阴极电极,在70°C下AEMWE的LSV曲线;(f) 60°C下AEMWE的稳定性测试。

总结

通过一系列系统的实验表征与性能评估,所合成的有序Ru-W2C Janus肖特基结材料 (Ru-W2C@C)在碱性析氢反应及水电解应用中表现出全方位的性能提升。在催化活性方面,其在100 mA cm^-2电流密度下的过电位低至69.5 mV,塔菲尔斜率仅为29.83 mV dec^-1,动力学显著加速。在反应机理方面,其独特的“双通道H*供给”机制有效促进了水离解,降低了反应活化能。在实际应用方面,基于该材料的AEMWE能在1.79 V的低电压下实现1 A cm^-2的高电流密度,质量活性是商业Pt/C的19倍,并展现出超过400小时的卓越运行稳定性。这些性能的全面提升,归因于有序Janus结构所实现的充分激活的肖特基结、高效的界面与非界面协同,以及由此带来的优化反应路径。

文献链接:

https://doi.org/10.1002/adfm.75365

    以上内容,如有误读和纰漏,敬请指

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      1. CONNECT:[ UseTime:0.001033s ] mysql:host=127.0.0.1;port=3306;dbname=h460;charset=utf8mb4
      2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001553s ]
      3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000724s ]
      4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000754s ]
      5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001381s ]
      6. SELECT * FROM `set` [ RunTime:0.000646s ]
      7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001420s ]
      8. SELECT * FROM `article` WHERE `id` = 498364 LIMIT 1 [ RunTime:0.001203s ]
      9. UPDATE `article` SET `lasttime` = 1776591712 WHERE `id` = 498364 [ RunTime:0.011653s ]
      10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000871s ]
      11. SELECT * FROM `article` WHERE `id` < 498364 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001263s ]
      12. SELECT * FROM `article` WHERE `id` > 498364 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000985s ]
      13. SELECT * FROM `article` WHERE `id` < 498364 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.005995s ]
      14. SELECT * FROM `article` WHERE `id` < 498364 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002261s ]
      15. SELECT * FROM `article` WHERE `id` < 498364 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005724s ]
      0.209213s