运行稳定的化纳米集群在碳化物上 介质反向溢出用于进化进化
Hao Fan1, Qian Qian Yang1, Song Ru Fang1
1Key Laboratory for Ultrafine Materials of Ministry of Education, Shanghai Engineering Research Center of Hierarchical Nanomaterials, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, 200237, Shanghai, China.
这项研究引入了一种使用质子交换膜 (PEM) 电解来生产绿色的新催化剂. 在碳化支上的新型化纳米集群使得高效的进化能够显著减少贵金属的使用.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 绿色化学 绿色化学
背景情况:
- 质子交换膜 (PEM) 电解对于绿色的生产至关重要,但受到高组金属 (PGM) 负载的阻碍.
- 在实际的PEM电解中,有效地管理催化剂表面上的吸附/脱附是具有挑战性的.
- 在支上固定PGM材料可以提高原子利用率和内在活性,但需要优化结能.
研究的目的:
- 开发一种用于PEM电解的新型电催化剂,可以最大限度地降低PGM负载,同时提高效率.
- 通过在碳化支上运行形成的化纳米集群调解进化的机制.
- 通过调整操作特征,为设计高性能支持的PGM电催化剂提供新的见解.
主要方法:
- 在碳化 (WCx) 支上固定稳定的化 (Pd) 化纳米集群的合成.
- 在PEM电解条件下研究Pd化物的形成和行为.
- 电化学测量和理论研究,以评估结能和溢出动态.
主要成果:
- 操作条件诱导了具有减弱结能 (HBE) 的Pd化物 (PdHx) 的形成.
- 从WCx (强HBE) 到PdHx地点的反向溢出被观察到并得到证据.
- PdHx-WCx催化剂在~1.66V的极低Pd负载 (0.022 mg cm-2) 时实现了1A cm-2的电流密度,并稳定运行了200小时.
结论:
- 开发的PdHx-WCx材料是用于PEM电解的高效阴极电催化剂.
- 调整操作特征以调节反向溢出是一种可行的策略,用于设计先进的支持PGM电催化剂.
- 这种方法为减少绿色生产技术中PGM使用提供了一条途径.
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