Finding an inexpensive and effective clean energy electrocatalyst is highly important for the new generation of photovoltaic devices. Herein, we report a facile and universal in situ co‐precipitation strategy to load three novel tantalum‐based compounds (NiTa₂O₆, MnTa₂O₆, and AlTaO₄) on honeycomb‐like bio‐based carbon (HBC) frameworks. The HBC framework with unique honeycomb‐like network structure serves as a support material in nanohybrids that can provide rich surface active sites and rapid electron transport channels for triiodide reduction reaction. The adoption of widely available and abundant biomass‐derived carbon into tantalum‐based compounds markedly boosts electrocatalytic properties of nanohybrids and exhibits robust corrosion resistance because nanohybrids adequately utilize the synergistic effects of different components. The photovoltaic devices fabricated with NiTa₂O₆/HBC, MnTa₂O₆/HBC, and AlTaO₄/HBC counter electrode catalysts demonstrate the brilliant power conversion efficiency (PCE) of 7.09%, 7.39%, and 7.86%, respectively, outperforming the Pt‐based cells (6.80%). This work offers a strategy for the further rational design of efficient, inexpensive, and durable electrocatalysts for advanced energy technology applications.

中文翻译：

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蜂窝状生物基碳骨架，装饰有三价钽基化合物，可作为高效，耐用的三碘化物还原反应电催化剂

寻找便宜且有效的清洁能源电催化剂对于新一代光伏装置非常重要。本文中，我们报告了一种简便而通用的原位共沉淀策略，可负载三种新型钽基化合物（NiTa ₂ O ₆，MnTa ₂ O ₆和AlTaO ₄）蜂窝状生物基碳（HBC）框架。具有独特蜂窝状网络结构的HBC框架可作为纳米杂化物的支撑材料，可为三碘化物还原反应提供丰富的表面活性位点和快速的电子传输通道。由于钽化合物充分利用了不同组分的协同作用，因此在钽基化合物中采用了广泛存在的丰富生物质衍生碳，从而显着提高了纳米杂化物的电催化性能，并显示出强大的耐腐蚀性。用NiTa ₂ O ₆ / HBC，MnTa ₂ O ₆ / HBC和AlTaO ₄制成的光电器件/ HBC对电极催化剂的出色功率转换效率（PCE）分别为7.09％，7.39％和7.86％，优于基于Pt的电池（6.80％）。这项工作为进一步合理设计用于先进能源技术应用的高效，廉价和耐用的电催化剂提供了一种策略。