使用重建实现了超稳定的水电解
Yu Lin1,2, Danji Huang3, Qunlei Wen1
1State Key Laboratory of Materials Processing and Die & Mould Technology, and School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, People's Republic of China.
概括
使用 (Mo) 剂的新型顺序漏策略增强了-铁硫化物 (NiFe-S) 催化剂在水电解中的氧化演化反应 (OER). 这种方法提高了催化剂的稳定性,并降低了绿色生产的能源消耗.
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
- 催化剂是一种催化剂.
背景情况:
- 在工作电位下活性原子的溶解降低了氧演化反应 (OER) 中的催化剂性能.
- 这种降解限制了高活性催化剂在工业水电解中的实际应用.
- 现有的催化剂在长时间运行时面临着保持稳定性和效率的挑战.
研究的目的:
- 制定一个连续的漏策略,以提高动态重组和化学键强度的催化剂稳定的OER.
- 调查外来Mo兴奋剂作为牺牲剂的作用,以减轻铁硫化物 (NiFe-S) 中的氧化腐蚀.
- 提高工业水电解和绿色生产的催化剂的效率和耐用性.
主要方法:
- 在铁硫化物 (NiFe-S) 中作为牺牲剂引入了外国Mo剂,用于传教.
- 使用操作式光谱学来监测Mo dopant在NiFe O(S) OH表面上的酸盐的浸出和吸附.
- 采用晶体职业汉密尔顿人群分析来了解电荷转移及其对M─S债券能量的影响.
主要成果:
- 外国Mo剂被出并被吸附为酸盐,增强M─S键能,防止进一步的Fe/Ni出.
- 经过改造的催化剂在400 mA cm-2下实现了250 mV的超低超电位和高稳定性 (>3,700 h在100 mA cm-2).
- 工业水电解证明了超低能耗 (4.30 kWh m-3H2) 和高稳定性 (>250小时在8,000 mA).
结论:
- 顺序漏策略通过控制离子漏,有效地提高了催化剂稳定性和OER性能.
- 开发的NiFe-S催化剂为经济高效的绿色生产提供了可行的途径.
- 实现的气生产成本为2.46美元/公斤H2符合未来的绿色气目标.
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