对太阳能分水器件的变反应和氧变反应电催化剂进行基准测试
Charles C L McCrory, Suho Jung, Ivonne M Ferrer
1§Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States.
Journal of the American Chemical Society
|February 11, 2015
概括
太阳能燃料设备的电催化剂的标准化测试揭示了有希望的演化反应 (HER) 催化剂. 然而,非高尚氧化演化反应 (OER) 催化剂在酸性溶液中表现出有限的潜力,而许多在性条件下表现良好.
科学领域:
- 电化学和材料科学 材料科学
- 可再生能源和催化剂的使用
背景情况:
- 客观的电催化剂评估对于开发高效的太阳能燃料设备至关重要.
- 为了比较电催化剂活性和稳定性,需要标准化测试协议.
研究的目的:
- 选18个演化反应 (HER) 和26个氧演化反应 (OER) 电催化剂.
- 在太阳能分水相关条件下评估催化剂活性,短期稳定性和电化学活性表面积 (ECSA).
- 为集成太阳能燃料应用确定有前途的电催化剂.
主要方法:
- 一个标准的协议被用于电催化剂的初级选.
- 测量包括在10 mA cm−2电流密度,ECSA和特异性活动时的超电位.
- 二次选涉及Faradaic效率和扩展稳定性测试,用于选择的催化剂.
主要成果:
- 几种HER催化剂在酸性和性溶液中在10mA cm−2时实现了低超电位 (<0.1V).
- 在酸性溶液中,没有非高贵的OER催化剂表现出有前途的活动;在性溶液中,许多OER催化剂的性能与贵金属相比.
- 一般来说,OER催化剂在性介质中比Ir和Ru更好地表现出每个ECSA的特异活性,而HER催化剂的特异活性比Pt.
结论:
- 这项研究提供了一个全面的数据集,用于评估太阳能水分裂电催化剂.
- 非贵金属OER催化剂在性介质中是可行的,但在这种应用中,在酸性条件下是不可行的.
- 需要进一步开发高活性和稳定的HER电催化剂,特别是与相比.
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