Synergizing photocatalysis with external fields offers a promising strategy to surpass limitations of single catalytic systems, yet designing catalysts that works in multi-field remains challenging. In this work, we explore catalysts that improves photocatalysis in solution plasma to significantly enhance H₂O₂ production. We focus on bronze TiO₂ and tune its crystallinity through an adjusted sodium titanate precursor route. In particular, the regular and wide tunnel structure of Na₂Ti₆O₁₃ precursor results in bronze TiO₂ with exceptional crystallinity. Upon introducing highly crystalline bronze TiO₂ nanobelts into solution plasma, we effectively suppress the photocatalytic decomposition of H₂O₂ in plasma field, reducing the decomposition rate by 70% compared to commercial P25 TiO₂ photocatalysts. Further carbon coating results in H₂O₂ concentrations up to 3.7 mmol/L, which is 1-3 orders of magnitude higher than most photocatalytic systems. Our work elucidates the potential photocatalytic effects within solution plasma and achieves synergy between photocatalysis and solution plasma.