Device and method for generating ammonia by nitrogen

[0085] Reaction: The 3H-type reaction cell is used as a reaction device, including a working electrode compartment, two counter electrode compartments and a proton-conducting cation exchange membrane. The photocathode of the first working electrode is p-type silicon (Au / SiO) supported by gold nanoparticles and protected by a silicon oxide layer. 2 / Si photocathode), the second working electrode is acid-etched, oxidized and methane plasma treated stainless steel base mesh material. Two working electrodes are placed in the working electrode compartment in an orderly manner, the second working electrode is close to the nitrogen gas inlet, and the first working electrode is close to the gas outlet. Platinum mesh and Ag / AgCl electrodes serve as counter and reference electrodes, respectively, and each counter electrode compartment contains a counter electrode and a reference electrode. The working electrode compartment is separated from the counter electrode compartment by a proton-...

[0089] Reaction: The reaction device and reaction conditions are consistent with Example 1, except that the stainless steel-based electrode is replaced with foam Cu as the second working electrode, Au / SiO 2 The / Si photocathode was still used as the first working electrode, and its applied voltage was fixed at −0.2 V (vs RHE), while the relationship between the applied voltage of the foamed Cu electrode and the photoelectrochemical nitrogen reduction behavior was investigated.

[0090] Au / SiO 2 The composition and structure of the / Si photocathode are consistent with Example 1, while the foamed Cu electrode is pure metallic Cu.

[0091] The result of the reaction is as image 3 As shown, the first working electrode Au / SiO 2 The working electrode system composed of Si photocathode and second working electrode foam Cu electrode has an applied voltage of -0.2V (vs RHE) on the first working electrode, and -0.7V (vs RHE) on the foam Cu electrode. , the ammonia production rate is...