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oai:figshare.com:article/34033952 2026-09-30T16:21:09Z category_21 category_24 category_272 category_873 category_39 portal_63 item_type_6 month_year_09_2026

Type-II g‑C₃N₄/AgM-CP Enables Tunable Syngas at Low Bias Raushan Kumar (3165069) Anurag Srivastav (25144880) Sushant Kumar (1310547) Biotechnology Evolutionary Biology Environmental Sciences not elsewhere classified Chemical Sciences not elsewhere classified Ecology sup >+</ sup partially consumes electrons moderate photocurrent density melamine coordination polymer improves light absorption concentrations govern activity competing hydrogen evolution total current density 75 ± 0 0 ± 13 low bias photoelectrochemical chopped illumination exhibits 3 </ sub 2 </ sub v </ lower bias low charge current efficiency − 0 sluggish kinetics poor selectivity negative potentials interfacial wettability electronic structure conversion performance catalyst achieves 88 v Photoelectrochemical (PEC) CO₂ reduction is hindered by sluggish kinetics, poor selectivity, and competing hydrogen evolution. Herein, a g-C₃N₄/Ag-melamine coordination polymer (AgM-CP) heterostructure is developed to enhance CO₂ conversion performance. Incorporation of Ag modulates the electronic structure, improves light absorption, and promotes selective syngas production without forming liquid byproducts. The catalyst achieves a total current density of 52 mA cm^–2, with ca. 15 mA cm^–2 attributed to CO₂ reduction at −1.48 V vs RHE. Under illumination, a maximum CO generation rate of (269.0 ± 13.4) μmolcm^–2h^–1 is achieved, with a higher CO/H₂ ratio at −0.88 V, which declines at more negative potentials. The <i>I</i>–<i>V</i> curve for g-AM collected under chopped illumination exhibits a moderate photocurrent density of 0.07 mA cm^–2 at −0.88 V vs RHE. Reduction of Ag⁺ partially consumes electrons, slightly lowering Faradaic efficiency. The g-AM exhibits impressive applied bias photon-to-current efficiency of ca. (1.75 ± 0.1) % at −1.08 V vs RHE. Interfacial wettability and local CO₂/H₂O concentrations govern activity; Tafel analysis shows first electron transfer limits, while low charge-transfer resistance enhances CO production at lower bias. 2026-09-30T00:00:00Z Text Journal contribution 10.1021/acs.energyfuels.6c03370.s001 https://figshare.com/articles/journal_contribution/Type-II_g_C_sub_3_sub_N_sub_4_sub_AgM-CP_Enables_Tunable_Syngas_at_Low_Bias/34033952 CC BY-NC 4.0