Herein, an effective electrocatalyst exploiting non-noble metal oxide-containing of manganese oxide (MnO₂) supported on graphitic carbon nitride (g-C₃N₄) for reduction of CO₂ over a wide range of potential. The MnO₂ decorated g-C₃N₄ nanocomposite was synthesized by precipitation, followed by calcination to attain uniform distribution of the MnO₂. The MnO₂ was found α-MnO₂ crystal structure with a size of ∼0.5–2 nm having interlinear lattice spacing of 0.243 nm seen on the layer of g-C₃N₄ (50−100 nm). The high defective sites observed on MnO₂/g-C₃N₄ (I_D/I_G) is 1.91 than pristine g-C₃N₄ (I_D/I_G) is 0.054. The core spectrum analysis of XPS showed N, C, O and Mn atoms in the as-synthesized composite. The electrocatalysts were executed for electrocatalytic hydrogenation of CO₂ at lower onset potential of −0.14 V vs. RHE into C₁ products having Faradaic efficiencies (FE) of 8, 47.45 and 65.28% at an applied potential of −0.14, −0.34 and −0.54 V vs. RHE, respectively. The catalyst has further used for the chemical hydrogenation of CO_2, and the good yield of formic acid was 9603.28 μmol obtained. The enrichment of the electrocatalytic activities was observed due to the synergetic effect of both MnO₂ and g-C₃N₄. This methodology will be applicable for industrial applications and it will help control environmental issues.

本文中，有效的电催化剂利用载于石墨氮化碳（gC ₃ N ₄）上的含氧化锰（MnO ₂）的非贵金属氧化物在大范围的电位上还原CO ₂。通过沉淀合成MnO ₂装饰的gC ₃ N ₄纳米复合材料，然后煅烧以获得MnO _2的均匀分布。MnO的₂发现α-MnO的₂晶体结构与具有行间看到GC的层上的0.243纳米晶格间距的尺寸为纳米~0.5-2 ₃ Ñ ₄（50-100 nm）。在MnO ₂ / gC ₃ N ₄（I _D / I _G）上观察到的高缺陷位为1.91，而原始gC ₃ N ₄（I _D / I _G）为0.054。XPS的核心光谱分析表明，合成后的复合物中存在N，C，O和Mn原子。执行电催化剂以在相对于RHE较低的起始电势-0.14 V下将CO ₂电催化氢化为具有法拉第效率（FE）为8、47.45和65.28％的C ₁产品，施加电势为-0.14，-0.34和-分别为0.54 V与RHE。该催化剂进一步用于CO的化学加氢_由图2可知，甲酸的收率良好，为9603.28μmol。由于MnO ₂和gC ₃ N ₄的协同作用，观察到了电催化活性的富集。该方法将适用于工业应用，并将有助于控制环境问题。