具有晶格水辅助氧气交换的IroO H2O,用于高性能质子交换膜水电解器
Jun Xu1, Huanyu Jin1,2, Teng Lu3
1School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia.
Science advances
|June 23, 2023
概括
本研究介绍了在质子交换膜水电解器 (PEMWE) 中用于氧化演化反应 (OER) 的晶格水纳入的氧化 (IrO·nH2O) 催化剂. 这些新型催化剂实现了高活性和特殊的稳定性,克服了传统的权衡.
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:
- 氧化演化反应 (OER) 对水电解至关重要,但面临着催化剂活性和稳定性的挑战.
- 晶体氧化物 (IrO2) 提供稳定性但缺乏活性,而无形的IrO2是活性但不稳定的.
研究的目的:
- 开发一种新型的氧化催化剂,它结合了高活性和稳定性OER在质子交换膜水电解器 (PEMWEs).
- 研究网格水在增强催化性能和稳定性方面的作用.
主要方法:
- 合成有网状水相结合的氧化物 (IrO2·nH2O),具有类似荷兰的短距离有序框架.
- 在PEMWE中合成催化剂的OER性能和稳定性的电化学表征.
- 对OER机制的分析,重点关注格子水的贡献.
主要成果:
- IrO2·nH2O证明了增强的OER活性和超过5700小时 (>8个月) 的超高稳定性,其稳定性记录数为1.9 × 107 n氧 nIr−1.1.
- 格子水被确定为一种活性氧物种,促进可持续和快速的氧气交换.
- 提出了一种涉及格子水的修改后的OER机制,有助于提高活动和稳定性,而不会导致结构退化.
- 使用IrO2·nH2O作为阳极电催化剂的高性能PEMWE在60°C下在600小时内在1 A cm-2处实现了1.77V的电池电压.
结论:
- 嵌入格子水中的氧化 (IrO2·nH2O) 有效地克服了小微企业OER催化剂的活性稳定性权衡.
- 独特的网格式水辅助机制为设计高活性和稳定的电催化剂提供了新的途径.
- 这一进步对通过水电解来有效和持久地生产气具有重大前景.
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