High-performance electrocatalysts for CO2 reduction to valueable chemical fuels are a key component in the design of efficient artificial photosynthetic systems. Formate is a common CO2 reduction product, and its selective electrochemical production is desirable but challenging. Most current attention focuses on Sn-based materials, which unfortunately exhibit moderate-to-high formate selectivity only within a very narrow and highly cathodic potential region. Bi has a great potential for formate production but remains under-explored. In this presentation, we report several different strategies to prepare unique Bi-based nanostructures with large surface areas. The final product exhibits large cathodic current density, excellent Faradaic efficiency (&gt;90%) over a broad potential window and great stability for CO2 reduction to formate. Furthmore, we integrate Bi with a p-type Si photocathode and achieve photoelectrochemical CO2 reduction to formate with high selectivity and stability. We also couple Bi with an oxygen evolution reaction electrocatalyst in full cells, and achieve battery-driven or solar-driven splitting of CO2/H2O into formate and oxygen at high energy conversion efficiency

2D bismuth nanostructures for electrocatalytic CO2 reduction to formate

256th National Meeting (2018)

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