在NiCoP/MXene电催化剂中通过邻近的Pt原子增强Ni/Co活动,以促进性的进化
Hua-Jie Niu1, Chuanxue Huang1, Tong Sun2
1School of Chemistry, Beijing Advanced Innovation Center for Biomedical Engineering, Beihang University, Beijing, 100191, China.
(Pt) 纳米颗粒在 (NiCoP) 化上显著提高演化反应 (HER) 活性. 这种新的Pt/NiCoP催化剂在水分应用中表现出增强的稳定性和效率.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 众所周知, (Pt) 可以增强化 (NiCoP) 的活性,用于演化反应 (HER).
- 将Pt与NiCoP集成是一个重要的合成挑战.
- 曲的碗状结构可以促进Pt和NiCoP之间的接口.
研究的目的:
- 在碗状结构中使用最小量的Pt (1‰摩尔比率) 构建一个Pt/NiCoP接口.
- 调查 HER 新型 Pt/NiCoP 材料的增强催化活性和稳定性.
- 通过实验和理论分析,阐明 HER 性能增强的基本机制.
主要方法:
- 合成Pt/NiCoP催化剂,专注于创建一个特定的接口.
- 电化学表征,包括在特定电流密度和长期稳定性测试中进行超电位测量.
- 用光谱技术 (XPS,sXAS,XAFS) 和理论计算 (DFT) 来分析电子结构和反应路径.
- 在现场电化学阻抗光谱 (EIS) 和扫描电化学显微镜 (SECM) 来探测接口特性.
主要成果:
- 在1M KOH中,Pt/NiCoP催化剂实现了26.5 mV (10 mA cm−2) 和181.6 mV (500 mA cm−2) 的低超电位.
- 与NiCoP相比,观察到水解离能障碍 (Ea) 的显著下降 (~43%) .
- 异常稳定性被证明是10.6μV h-1的降解率在500mA cm-2和50°C超过3000小时.
- 接口电子转移降低了Co/Ni的价值状态,激活了催化剂.
- DFT的计算证实了催化步骤从Heyrovsky (2.71 eV) 转移到Pt附近的Tafel (0.51 eV),与改进的H ads相一致.
结论:
- 在曲的NiCoP结构上引入最小的Pt量有效地为HER创建了一个活跃的接口.
- Pt/NiCoP催化剂在生产方面表现出卓越的活性,效率和耐用性.
- 增强的性能归因于介面电子转移和修改的反应途径,这是实验和理论研究证实的.
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