Black titania nanofibers (NFs) were electrospun and subjected to a simplified two-step sintering process at low pressure. Disordered “black” titania structures developed; Ti-O exhibited a blue shift and electrons occupied oxygen vacancies. Black titania NFs were coated with graphitic carbon nitride (g-C₃N₄) via sintering in an Ar atmosphere; the facile fabrication of metal-free heterostructures using non-toxic H₂O reaction medium was reported to participate in photocatalytic CO₂ reduction under UV–vis light irradiation, showing CO and CH₄ yields of 5.19 and 1.65 μmol/g, respectively. The heterostructured g-C₃N₄/black titania NFs indicated 1.8-fold higher production of CO₂ conversion (CO and CH₄) compared to that of g-C₃N₄ while the heterostructure showed 2.12 times higher production of CO₂ conversion (CO and CH₄) compared to that of black titania NFs. Finally, the reusability test of the heterostructure was conducted upto the fourth cycle. Throughout the entire electronic band, heterostructured g-C₃N₄/black titania NFs exhibited increased absorption at 470 nm, even at the lowest photoluminescence intensity compared to that of g-C₃N₄. The calculated Fermi level and conduction/valence bands showed that the heterostructured g-C₃N₄/ black titania NFs exhibited proper band position associated with a sufficient kinetic overpotential of (△E_a,CH4) 0.54 eV, for successful production of both CO and CH₄. This confirms that g-C₃N₄ and black titania NFs were well-connected via their interfaces so that this metal-free heterostructured g-C₃N₄/black titania NFs has proven its possibility to yield its CO₂ conversion products.

黑色二氧化钛纳米纤维（NFs）进行静电纺丝，并在低压下经过简化的两步烧结工艺。出现了无序的“黑色”二氧化钛结构；Ti-O呈现蓝移，电子占据了氧空位。黑色二氧化钛NFs通过在Ar气氛中烧结涂覆了石墨氮化碳（gC ₃ N ₄）；据报道，使用无毒的H ₂ O反应介质轻松制造无金属的异质结构，可在紫外可见光照射下参与光催化CO _2的还原，显示出CO和CH _4的产率分别为5.19和1.65μmol/ g。异质结构的gC ₃ N ₄/黑色二氧化钛NFs表示，与gC ₃ N ₄相比，CO ₂转化的产量（CO和CH ₄）高1.8倍，而异质结构显示，CO ₂转化（CO和CH ₄）的产量高2.12倍。黑二氧化钛NFs。最后，对异质结构的可重用性测试一直进行到第四个周期。在整个电子带，异质结构的GC ₃ Ñ ₄ /二氧化钛黑色表现出的NF相比于GC的，即使在最低光致发光强度在470nm吸收增加，₃ Ñ ₄。计算出的费米能级和导带/价带显示，杂结构化的gC ₃ N ₄ /黑二氧化钛NFs具有适当的能带位置，具有足够的（△E _a，CH4）0.54 eV动力学超电势，可以成功产生CO和CH ₄。这证实了gC ₃ N ₄和黑二氧化钛NFs通过它们的界面连接良好，因此，这种无金属的异质结构的gC ₃ N ₄ /黑二氧化钛NFs已被证明可以产生其CO ₂转化产物。