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To further explore the possibility of the electrochemical reduction of NaBO 2  into NaBH 4 , the electrochemical reduction of NaBO 2  into NaBH 4  was fulfilled with pulse voltage using the Eu-Co-Ni-B coating electrode. A simple electroless plating technique was used to prepare the Eu-Co-Ni-B coating electrode. It has been proved that NaBO 2  was converted into NaBH 4  by electrochemical analysis method. The results showed that the method of detection and quantitative analysis of NaBH 4  with gold electrode was feasible (R 2 =0.98). When the reverse pulse voltage was + 0.5 V, the forward pulse voltage was −1.5 V, the reverse pulse duration was 2 s and the forward pulse duration was 2 s, the concentration of NaBH 4  reaches a maximum of 1.25 × 10 −4  mol/L. With the continuous increase of electrolytic time, the concentration of NaBH 4  shows a trend of increasing first and then decreasing. When the electrolytic time was 2 h, the maximum concentration of NaBH 4  reaches 1.61 × 10 −4  mol/L.

Electrochemical reduction of NaBO 2 into NaBH 4 with pulse voltage using the Eu-Co-Ni-B coating electrode