Metal-Free Catalyst TTT-DHTD Rivals Platinum in Zn-Air Cells

The correct answer is platinum. Many clean-energy technologies, and hydrogen fuel cells in particular, depend on platinum to speed up the oxygen reduction reaction, and because it is one of the rarest and most expensive metals available, its cost and limited supply stand in the way of large-scale use. The newly reported organic framework matched about ninety-six per cent of the performance of commercial platinum catalysts while using no precious metal at all, which is why the work matters for the price of zinc-air cells. Options A, C and D name palladium, iridium and ruthenium, which are also costly metals used in various catalytic applications, but none of them is the metal identified as the benchmark and the bottleneck in this study. Candidates should link the material to platinum, to the oxygen reduction reaction and to zinc-air batteries together, since questions usually test one of these three links.

The correct answer is 120 hours. Tests showed that even after that long a spell of continuous running, the material kept its performance and did not suffer the degradation or contamination that commonly affects catalysts built around metals. This durability matters as much as the raw activity figure, because a catalyst that performs brilliantly for an hour and then decays is of little practical use in a battery meant for transport or for storing renewable power. Options A and B understate the tested period, while option D overstates it by a wide margin. Candidates should pair this number with the other headline figure from the same study, namely that the material reached roughly ninety-six per cent of the performance of commercial platinum catalysts, and should also remember that the simulations traced the result to sites in the molecular structure where oxygen attaches and reacts readily.

The correct answer is S. N. Bose National Centre for Basic Sciences, Kolkata, the Institute of Nano Science and Technology, Mohali, and SRM University, Amaravati. The first two are institutions of the Department of Science and Technology, and the team was led by Dr. Pradip Pachfule, Prof. Ramendra Sundar Dey and Prof. Ranjit Thapa respectively, with the findings published in the journal Science Advances. Options A, C and D list well-known Indian research bodies, including engineering institutes, basic science institutes and national laboratories, but none of these combinations is the group credited with this particular material. Remember that questions on such announcements often ask either for the lead institution, for the parent department, or for the journal, so it is worth memorising all three: the Department of Science and Technology as parent, Kolkata and Mohali as the two institute locations, and Science Advances as the journal.