Electrocatalytic Study of Carbon Dioxide Reduction By Co(TPP)Cl Complex

Table 1

Current efficiencies and turnover numbers of electrocatalytic reduction of CO₂ catalyzed by Co(TPP)Cl at both carbon and p-type Si electrodes. T.N. = moles of product/moles of catalyst.

Electrode	CPE potential; (SCE)	Number of moles of catalyst µmole	Time of experiment/h	Charge coulomb/C	Current efficiency; CO	T.N. CO	Number of CO; moles	Current efficiency; H2
Carbon	−1.85	1	1.4	5.4	72	19	19	1.2
p-type Si	−1.55	1	1.4	4.2	65	13.9	13.9	10

The rest of current efficiency was unknown which might have been consumed by conversion of CO₂ into oxalate or formate. Saveant and coworker reported that CO₂ will be converted to oxalate or formate in the presence of a weak acid [42], or by decomposition of catalyst.