The photocatalytic generation of hydrogen peroxide from water and dioxygen (H₂O + 1/2O₂ → H₂O₂, ΔG° = +117 kJ mol^–1) under sunlight is a promising strategy for the artificial photosynthesis of a liquid fuel. We had previously found that resorcinol–formaldehyde (RF) resin powders prepared by the base-catalysed high-temperature hydrothermal method act as semiconductor photocatalysts for H₂O₂ generation. Herein, we report that RF resins prepared by the acid-catalysed high-temperature hydrothermal method (~523 K) using common acids at pH < 4 exhibit enhanced photocatalytic activity. The base- and acid-catalysed methods both produce methylene- and methine-bridged resins consisting of π-conjugated and π-stacked benzenoid–quinoid donor–acceptor resorcinol units. The acidic conditions result in the resins with a lower bandgap (1.7 eV) and higher conductivity because the lower-degree of crosslinking creates a strongly π-stacked architecture. The irradiation of the RF-acid resins with simulated sunlight in water with atmospheric-pressure O₂ generates H₂O₂ at a solar-to-chemical conversion efficiency of 0.7%, which is the highest efficiency ever reported for powder catalysts used in artificial photosynthesis.

_{在阳光下从水和分子氧 (H 2} O + 1/2O ₂  → H ₂ O ₂ , Δ G ° = +117 kJ mol ^–1 )光催化产生过氧化氢是一种很有前途的液体燃料人工光合作用策略. 我们之前发现碱催化高温水热法制备的间苯二酚-甲醛（RF）树脂粉末可作为H ₂ O _{2的半导体光催化剂。}一代。在此，我们报道了在 pH < 4 下使用普通酸通过酸催化高温水热法 (~523 K) 制备的 RF 树脂表现出增强的光催化活性。碱催化和酸催化方法均产生由 π 共轭和 π 堆叠的苯系物-醌型供体-受体间苯二酚单元组成的亚甲基和次甲基桥接树脂。酸性条件导致树脂具有较低的带隙 (1.7 eV) 和较高的电导率，因为较低的交联度会产生强烈的 π 堆叠结构。射频酸树脂在常压O ₂水中模拟阳光照射产生H ₂ O ₂太阳能到化学的转化效率为 0.7%，这是迄今为止报道的用于人工光合作用的粉末催化剂的最高效率。