低结晶度B-Co3O4纳米颗粒电催化硝酸盐还原合成氨

Low-crystallinity B-Co3O4 Nano-particles for Electrocatalytic Nitrate to Ammonia

    摘要
  • 摘要: 采用简单的沉淀-煅烧工艺合成了B-Co3O4 Nano-particles(NPs)，研究了B-Co3O4 NPs电催化硝酸盐还原合成氨(NitrRR)的性能。研究发现：在含0.1 mol/L NaNO3的NaOH(1 mol/L)溶液中进行电催化反应, B-Co3O4 NPs具有较高的电催化活性。当电压在-0.8 V(vs. RHE)时，获得20 mg/(h ·cm2)的NH3产率和94%的法拉效应(FE)。当电压在-0.6 V(vs. RHE)时，获得17.2 mg/(h ·cm2)的NH3产率和95%的FE。电极材料B-Co3O4 NPs优异的电化学性能得益于B-Co3O4 NPs中的B—O键在电催化过程中能有效抑制析氢反应。较低的结晶度和特殊的多孔结构有效促进了B-Co3O4 NPs对NO3-的吸附性和还原活性, 也促进了电子的传输与转移过程。

     

    Abstract: A simple precipitation calcination process was used to synthesize B-Co3O4 NPs and apply them as electrocatalytic reduction of nitrate by ammonia. Research has found that B-Co3O4 NPs have high electrocatalytic activity and when the voltage is -0.8(V vs. RHE). It attains an impressive NH3 yield of 20 mg/(h ·cm2) and 94% (FE). In NaOH (1 mol/L) solution containing 0.1 mol/L NaNO3. When the voltage is -0.6 V (vs. RHE), it corresponds to a NH3 yield of 17.2 mg/(h ·cm2) and 95% FE. The excellent electrochemical performance of electrode material B-Co3O4 NPs is attributed to the effective inhibition of hydrogen evolution reaction by B—O in the electrocatalytic process. The low crystallinity and special porous structure of B-Co3O4 NPs effectively improve the adsorption and reduction activity of NO3-, promoting electron transfer and transfer.

     

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