Conversion of CO₂ in a scalable technology has the potential for enormous energy and environmental impact but remains a challenge. We present several stable, earth abundant perovskite oxide materials for the reverse water gas shift chemical looping (RWGS-CL) process as a potential solution for this CO₂ mitigation problem. This material and process combination circumvents issues plaguing other emerging technologies, viz. poor rates of CO₂ conversion, high operation temperatures, use of precious metal catalysts, or combinations thereof. Using DFT-calculated oxygen vacancy formation energy, a key descriptor for the RWGS-CL process, we have successfully predicted several earth abundant perovskite oxides with high CO₂ conversion capability. We simultaneously achieved 100% selective CO generation from CO₂ at the highest known rates (∼160 μmoles per min per gram perovskite oxide) at record low process temperatures of 450–500 °C using lanthanum and calcium based perovskite oxides. These materials are stable over several RWGS-CL cycles, enabling industrial implementation.

中文翻译：

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地球上富含钙钛矿氧化物，可实现低温CO ₂转化†

将CO ₂转化为可扩展技术具有潜在的巨大能源和环境影响，但仍然是一个挑战。我们提出了几种稳定的，富含地球的钙钛矿氧化物材料，用于反向水煤气变换化学循环（RWGS-CL）工艺，作为解决CO ₂缓解问题的潜在解决方案。这种材料和工艺的结合可以避免困扰其他新兴技术的问题。CO ₂转化率低，操作温度高，使用贵金属催化剂或其组合。使用DFT计算的氧空位形成能（RWGS-CL过程的关键描述子），我们已经成功地预测了几种具有高CO _2的富含地球的钙钛矿氧化物转换能力。我们同时使用镧和钙基钙钛矿氧化物，在创纪录的450-500°C的低工艺温度下，以最高的已知速率（每克钙钛矿氧化物每分钟约160μmol/ min）从CO ₂中实现了100％的选择性CO生成。这些材料在多个RWGS-CL周期内保持稳定，可实现工业应用。